Pub Date : 2023-02-06DOI: 10.1080/00218464.2023.2174434
P. Ferreira, R. Campilho, I. Sánchez Arce, D. C. Gonçalves, C. Prakash
ABSTRACT Nowadays, adhesive joints are largely applied in the automotive, aircraft and aerospace, civil, and naval industries. Although several applications involve flat (plane) adherends, curved joints play an important role in many engineering applications like civil and aircraft construction. This work aims to investigate three structural adhesives, ranging from brittle to ductile, applied in curved joggle-lap joints between carbon fibre reinforced polymer adherends and subjected to internal pressure, to validate a robust design procedure and provide project guidelines for this complex structural, geometrical, and loading system, which constitute the main novelty of the proposed work. A numerical cohesive zone model parametric analysis was undertaken by varying the overlap length, thickness of the adherends, and adherends’ curvature, including the evaluation of peel and shear stresses in the adhesive, failure mode comparison, maximum load, and energy dissipated after failure. Validation of the cohesive zone model technique was initially performed using flat single-lap joint under tensile loads. A significant effect of the overlap length and thickness of the adherends on the maximum load was found, while the adherends’ curvature effect on the maximum load was negligible. Ductile adhesives, although less strong, generally performed better in terms of maximum load and dissipated energy.
{"title":"Static strength prediction of curved composite joints under internal pressure","authors":"P. Ferreira, R. Campilho, I. Sánchez Arce, D. C. Gonçalves, C. Prakash","doi":"10.1080/00218464.2023.2174434","DOIUrl":"https://doi.org/10.1080/00218464.2023.2174434","url":null,"abstract":"ABSTRACT Nowadays, adhesive joints are largely applied in the automotive, aircraft and aerospace, civil, and naval industries. Although several applications involve flat (plane) adherends, curved joints play an important role in many engineering applications like civil and aircraft construction. This work aims to investigate three structural adhesives, ranging from brittle to ductile, applied in curved joggle-lap joints between carbon fibre reinforced polymer adherends and subjected to internal pressure, to validate a robust design procedure and provide project guidelines for this complex structural, geometrical, and loading system, which constitute the main novelty of the proposed work. A numerical cohesive zone model parametric analysis was undertaken by varying the overlap length, thickness of the adherends, and adherends’ curvature, including the evaluation of peel and shear stresses in the adhesive, failure mode comparison, maximum load, and energy dissipated after failure. Validation of the cohesive zone model technique was initially performed using flat single-lap joint under tensile loads. A significant effect of the overlap length and thickness of the adherends on the maximum load was found, while the adherends’ curvature effect on the maximum load was negligible. Ductile adhesives, although less strong, generally performed better in terms of maximum load and dissipated energy.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2119 - 2144"},"PeriodicalIF":2.2,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44965888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.1080/00218464.2023.2170794
Chao Kang, J. Machado, Y. Sekiguchi, Ming Ji, C. Sato, M. Naito
ABSTRACT Machine learning is extensively used in material research and development, including adhesion technology. However, it requires a large dataset to train the models for optimizing, developing, and designing new adhesives. This study proposes a novel testing machine that enables quick high-throughput measurements of the shear strength of adhesively bonded joints. A small cylindrical butt shear joint (BSJ) specimen placed in a holder was pushed by a metal specimen pusher until failure; during this process, the force and displacement were recorded. This testing machine can be used to quickly conduct the measurement by simply placing the specimen in a holder and pushing it. A comparison of the average shear strength measured by this method and that measured by single-lap shear tests, coupled with stress analysis using finite element simulation suggested that the proposed method can measure the shear strength more accurately, where a higher level of pure shear can be achieved in the adhesive layers with a lower degree of stress concentration and smaller peeling stress at the extremities of the adhesives. This indicates that the shear strength of adhesively bonded joints can be measured quickly using the proposed testing method, thereby facilitating the development of new adhesives using machine learning.
{"title":"A butt shear joint (BSJ) specimen for high throughput testing of adhesive bonds","authors":"Chao Kang, J. Machado, Y. Sekiguchi, Ming Ji, C. Sato, M. Naito","doi":"10.1080/00218464.2023.2170794","DOIUrl":"https://doi.org/10.1080/00218464.2023.2170794","url":null,"abstract":"ABSTRACT Machine learning is extensively used in material research and development, including adhesion technology. However, it requires a large dataset to train the models for optimizing, developing, and designing new adhesives. This study proposes a novel testing machine that enables quick high-throughput measurements of the shear strength of adhesively bonded joints. A small cylindrical butt shear joint (BSJ) specimen placed in a holder was pushed by a metal specimen pusher until failure; during this process, the force and displacement were recorded. This testing machine can be used to quickly conduct the measurement by simply placing the specimen in a holder and pushing it. A comparison of the average shear strength measured by this method and that measured by single-lap shear tests, coupled with stress analysis using finite element simulation suggested that the proposed method can measure the shear strength more accurately, where a higher level of pure shear can be achieved in the adhesive layers with a lower degree of stress concentration and smaller peeling stress at the extremities of the adhesives. This indicates that the shear strength of adhesively bonded joints can be measured quickly using the proposed testing method, thereby facilitating the development of new adhesives using machine learning.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2080 - 2096"},"PeriodicalIF":2.2,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48003796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.1080/00218464.2023.2169607
W. Zhuang, Hongda Shi, Sheng-Yang Chen, Ming Li
ABSTRACT The clinch-adhesive joint has good mechanical properties and the curing degree of the adhesive during the clinching process shows significant impacts on the joint forming and its mechanical performance. During the clinching process, the interface of the cured adhesive layer restricts the flow of the metal thus shows a negative influence on the forming quality of the clinch-adhesive joint. This paper focuses on the interface layers change during the clinching process and the infulence of curing degree on the forming of clinch-adhesive joint by the finite element simulation model. Firstly, the constitutive model and interfacial failure criterion of Araldite 2015 epoxy adhesive considering curing degree were fitted through tensile tests for adhesive dumbbell specimens and bonding joints. Then, the forming process of the clinch-adhesive joints with fully cured adhesive were simulated. Finally, the effects of curing degree on the joint shape and interface failure were investigated. The results show that interface damage occurs at the location of the self-locking, and the curing degree mainly shows influences on the sizes of adhesive pocket and undercut, the damaged width of the interface layers, and the maximum damage of the interface layers.
{"title":"Effect of curing degree on forming of clinch-adhesive joint","authors":"W. Zhuang, Hongda Shi, Sheng-Yang Chen, Ming Li","doi":"10.1080/00218464.2023.2169607","DOIUrl":"https://doi.org/10.1080/00218464.2023.2169607","url":null,"abstract":"ABSTRACT The clinch-adhesive joint has good mechanical properties and the curing degree of the adhesive during the clinching process shows significant impacts on the joint forming and its mechanical performance. During the clinching process, the interface of the cured adhesive layer restricts the flow of the metal thus shows a negative influence on the forming quality of the clinch-adhesive joint. This paper focuses on the interface layers change during the clinching process and the infulence of curing degree on the forming of clinch-adhesive joint by the finite element simulation model. Firstly, the constitutive model and interfacial failure criterion of Araldite 2015 epoxy adhesive considering curing degree were fitted through tensile tests for adhesive dumbbell specimens and bonding joints. Then, the forming process of the clinch-adhesive joints with fully cured adhesive were simulated. Finally, the effects of curing degree on the joint shape and interface failure were investigated. The results show that interface damage occurs at the location of the self-locking, and the curing degree mainly shows influences on the sizes of adhesive pocket and undercut, the damaged width of the interface layers, and the maximum damage of the interface layers.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2053 - 2079"},"PeriodicalIF":2.2,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59096909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-26DOI: 10.1080/00218464.2023.2168536
Hiasmim Rohem Gualberto, João Marciano Laredo Dos Reis, Mônica Calixto de Andrade, H. Costa, Felipe do Carmo Amorim
ABSTRACT Metal structures can be repaired with composites using adhesives. However, because it involves polymeric materials, the environmental conditions of the structure can modify the behavior of the material, making its use unfeasible. Ultraviolet radiation (UV) is a degradation agent that has strong action on the polymeric materials, which are present in the adhesives and matrix of composites. In this work, it is studied the behavior of steel/GFRP single-lap joints using epoxy adhesive when exposed to UV radiation for different time intervals, to understand their behavior. The joint behavior was evaluated by shear testing and the adhesive was analyzed by DMA, FTIR and TGA. A decline of up to 32.5% in shear strength was observed with increasing UV exposure time. The Tg of the adhesive also showed a reduction. The FTIR spectra of the adhesive indicated a reduction in peaks related to epoxy functional groups when the exposure time was increased. This revealed degradation of the polymeric chains of the adhesive, a fact that can be associated with the reduction in Tg and the reduction in the shear strength of the joint. Thus, the application of such material in places exposed to UV radiation should consider the poorer performance regarding degradation.
{"title":"Influence of artificial UV degradation on the performance of steel/GFRP single-lap joints during exposure time","authors":"Hiasmim Rohem Gualberto, João Marciano Laredo Dos Reis, Mônica Calixto de Andrade, H. Costa, Felipe do Carmo Amorim","doi":"10.1080/00218464.2023.2168536","DOIUrl":"https://doi.org/10.1080/00218464.2023.2168536","url":null,"abstract":"ABSTRACT Metal structures can be repaired with composites using adhesives. However, because it involves polymeric materials, the environmental conditions of the structure can modify the behavior of the material, making its use unfeasible. Ultraviolet radiation (UV) is a degradation agent that has strong action on the polymeric materials, which are present in the adhesives and matrix of composites. In this work, it is studied the behavior of steel/GFRP single-lap joints using epoxy adhesive when exposed to UV radiation for different time intervals, to understand their behavior. The joint behavior was evaluated by shear testing and the adhesive was analyzed by DMA, FTIR and TGA. A decline of up to 32.5% in shear strength was observed with increasing UV exposure time. The Tg of the adhesive also showed a reduction. The FTIR spectra of the adhesive indicated a reduction in peaks related to epoxy functional groups when the exposure time was increased. This revealed degradation of the polymeric chains of the adhesive, a fact that can be associated with the reduction in Tg and the reduction in the shear strength of the joint. Thus, the application of such material in places exposed to UV radiation should consider the poorer performance regarding degradation.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2011 - 2030"},"PeriodicalIF":2.2,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48730208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-26DOI: 10.1080/00218464.2023.2171871
Guofeng Qin, Yunli Zhang, Peiwen Mi, Yongjian Zhu, Ming Li, Jingxin Na
ABSTRACT The existing studies on the degradation mechanism of composite adhesive joints mostly focus on the aging of adhesives, but the aging effect of composites is often ignored. In this paper, the degradation mechanism of adhesive, CFRP, as well as shear joints (SJ) and butt joints (BJ) in thermal-humidity-cycles (T-H-C) for automobiles were investigated by chemical detection and mechanical testing. The aging effects of adhesives and composites are compared and analyzed by the variation in chemical and mechanical properties to reveal the degradation mechanism of composite adhesive joints. Experimental testing show that the adhesive and CFRP underwent hydrolysis and oxidative decomposition respectively, and there was a reduction in Tg (glass transition temperature) and thermal stability. The joint strength of composite adhesive joints fell by around 40% after 30d (days), and interfacial failure appeared. The variation in the composition of adhesive and CFRP, interfacial failure and thermal stress contributed to the degradation of composite adhesive joints. Degradation mechanism analysis shows that SJ under shear stress state were less affected by CFRP aging, while BJ under normal stress state were more affected by CFRP aging and the effect became more obvious with time growth.
{"title":"Research on the Aging Effects of Adhesive and Composites on the Degradation Mechanism of Composite Adhesive Joints in Thermal-Humidity-Cycles for Automobiles","authors":"Guofeng Qin, Yunli Zhang, Peiwen Mi, Yongjian Zhu, Ming Li, Jingxin Na","doi":"10.1080/00218464.2023.2171871","DOIUrl":"https://doi.org/10.1080/00218464.2023.2171871","url":null,"abstract":"ABSTRACT The existing studies on the degradation mechanism of composite adhesive joints mostly focus on the aging of adhesives, but the aging effect of composites is often ignored. In this paper, the degradation mechanism of adhesive, CFRP, as well as shear joints (SJ) and butt joints (BJ) in thermal-humidity-cycles (T-H-C) for automobiles were investigated by chemical detection and mechanical testing. The aging effects of adhesives and composites are compared and analyzed by the variation in chemical and mechanical properties to reveal the degradation mechanism of composite adhesive joints. Experimental testing show that the adhesive and CFRP underwent hydrolysis and oxidative decomposition respectively, and there was a reduction in Tg (glass transition temperature) and thermal stability. The joint strength of composite adhesive joints fell by around 40% after 30d (days), and interfacial failure appeared. The variation in the composition of adhesive and CFRP, interfacial failure and thermal stress contributed to the degradation of composite adhesive joints. Degradation mechanism analysis shows that SJ under shear stress state were less affected by CFRP aging, while BJ under normal stress state were more affected by CFRP aging and the effect became more obvious with time growth.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2097 - 2118"},"PeriodicalIF":2.2,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46068552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-23DOI: 10.1080/00218464.2023.2169145
Shravan Kumar Chinta, D. S, B. G., H. R, N. B, S. C, S. M
ABSTRACT This paper focuses on the experimental investigation on the effect of different fiber reinforcement phases and post-cure temperature to improve the strength recovery of adhesively bonded patch repair in glass/epoxy composite laminates. The repair was performed on the site of damaged region in the laminates by using various configurations of patches such as chopped glass (CG), chopped glass/carbon (CGC), chopped glass/kevlar (CGK), ply-by-ply glass (PG), ply-by-ply glass/carbon (PGC), ply-by-ply glass/kevlar (PGK), stitched glass (SG), stitched glass/carbon (SGC), and stitched glass/kevlar (SGK). The result reveals that the SGK hybrid patch repaired laminates offered a strength recovery by 101.5% as compared with damaged laminates. Further, the SGK hybrid patch was subjected to post-cure temperatures of 50°C, 70°C, 90°C, and 110°C which were considered based on the glass transition temperature (Tg) of glass/epoxy laminates. The result shows that the SGK hybrid patch with a post-cured temperature of 50°C has equal strength with virgin laminates and the strength recovery was improved by 112.9% as compared with damaged laminates. This study concluded that the adhesively bonded hybrid patch repair with a post-cure temperature of 50°C can be used for various fiber-reinforced polymer (FRP) industries to repair laminated composites.
{"title":"Effect of reinforcement phases and post-cure temperature on adhesively bonded hybrid patch repair in indented glass/epoxy composite laminates","authors":"Shravan Kumar Chinta, D. S, B. G., H. R, N. B, S. C, S. M","doi":"10.1080/00218464.2023.2169145","DOIUrl":"https://doi.org/10.1080/00218464.2023.2169145","url":null,"abstract":"ABSTRACT This paper focuses on the experimental investigation on the effect of different fiber reinforcement phases and post-cure temperature to improve the strength recovery of adhesively bonded patch repair in glass/epoxy composite laminates. The repair was performed on the site of damaged region in the laminates by using various configurations of patches such as chopped glass (CG), chopped glass/carbon (CGC), chopped glass/kevlar (CGK), ply-by-ply glass (PG), ply-by-ply glass/carbon (PGC), ply-by-ply glass/kevlar (PGK), stitched glass (SG), stitched glass/carbon (SGC), and stitched glass/kevlar (SGK). The result reveals that the SGK hybrid patch repaired laminates offered a strength recovery by 101.5% as compared with damaged laminates. Further, the SGK hybrid patch was subjected to post-cure temperatures of 50°C, 70°C, 90°C, and 110°C which were considered based on the glass transition temperature (Tg) of glass/epoxy laminates. The result shows that the SGK hybrid patch with a post-cured temperature of 50°C has equal strength with virgin laminates and the strength recovery was improved by 112.9% as compared with damaged laminates. This study concluded that the adhesively bonded hybrid patch repair with a post-cure temperature of 50°C can be used for various fiber-reinforced polymer (FRP) industries to repair laminated composites.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2031 - 2051"},"PeriodicalIF":2.2,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42762849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-18DOI: 10.1080/00218464.2023.2167600
Manabu Inutsuka, Masataka Kondo, T. Koita, Soowon Lim, Keisuke Ota, Tomoki Honda, Ryo Ogawa, T. Namihira, C. Tokoro
ABSTRACT Facile techniques are required for the debonding of polymeric adhesives from metals for material recycling. A promising solution is a pulsed discharge debonding method. In this approach, a pulsed discharge with a high voltage is applied to the system over a short time. Rapid expansion of gasified materials and shock-wave emissions are produced from the discharge passage, which results in debonding. A drawback of the conventional pulsed discharge method is that it must be conducted in water, otherwise, the pulsed discharge creeps along the material surface without destroying the adhesion. In this study, filler was added to the structure adhesive for the effective pulsed discharge debonding of metal adherend. Epoxy resins with fillers of carbon black, copper and barium titanate particles were fabricated, and their properties and adhesive strength before and after application of the pulsed discharge were investigated. We succeeded in introducing the pulsed discharge inside the adhesive by adding 3.4 vol% of carbon black to the epoxy adhesive; the rapid expansion of gasified adhesion that was caused by the discharge, resulted in debonding. The threshold volume fraction of carbon black for effective pulsed discharge inside the adhesive was discussed based on the percolation model with experimental data.
{"title":"Electrical properties of adhesives designed for smart debonding by a pulsed discharge method","authors":"Manabu Inutsuka, Masataka Kondo, T. Koita, Soowon Lim, Keisuke Ota, Tomoki Honda, Ryo Ogawa, T. Namihira, C. Tokoro","doi":"10.1080/00218464.2023.2167600","DOIUrl":"https://doi.org/10.1080/00218464.2023.2167600","url":null,"abstract":"ABSTRACT Facile techniques are required for the debonding of polymeric adhesives from metals for material recycling. A promising solution is a pulsed discharge debonding method. In this approach, a pulsed discharge with a high voltage is applied to the system over a short time. Rapid expansion of gasified materials and shock-wave emissions are produced from the discharge passage, which results in debonding. A drawback of the conventional pulsed discharge method is that it must be conducted in water, otherwise, the pulsed discharge creeps along the material surface without destroying the adhesion. In this study, filler was added to the structure adhesive for the effective pulsed discharge debonding of metal adherend. Epoxy resins with fillers of carbon black, copper and barium titanate particles were fabricated, and their properties and adhesive strength before and after application of the pulsed discharge were investigated. We succeeded in introducing the pulsed discharge inside the adhesive by adding 3.4 vol% of carbon black to the epoxy adhesive; the rapid expansion of gasified adhesion that was caused by the discharge, resulted in debonding. The threshold volume fraction of carbon black for effective pulsed discharge inside the adhesive was discussed based on the percolation model with experimental data.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"1996 - 2010"},"PeriodicalIF":2.2,"publicationDate":"2023-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48404384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-11DOI: 10.1080/00218464.2023.2165442
J. Qiu, Sulan Li, Di Cai, Ning Gao, Weili Zhang, Youbing Li, T. Xia, Chaolong Yang
ABSTRACT Polymer-metal hybrids were prepared by using the ultrasonic-assisted hot-press molding process. The surface of the aluminum alloy is anodized to produce nano-pores with a pore size distribution of 60 to 210 nm. The surface of the anodized aluminum alloy is soaked with a silane coupling agent solution to alter its surface polarity. In addition, PP-g-MAH was used to alter the polarity of polypropylene. The structure and properties of the composites were investigated by tensile shear tests, the microstructure of the bonding interface, and elemental analysis. The results show that adding silane coupling agents can create a chemical connection based on the mechanical interlocking structure of the composite bonding interface, leading to an increase in tensile shear strength. When the aluminum alloy surface was treated with a silane coupling agent with a volume fraction of 4%, the tensile shear strength reached 21.02 MPa, increasing by 20.32% compared to the specimen without the silane coupling agent treatment.
{"title":"Influence of silane coupling agents on the interfacial structure and properties of modified polypropylene/aluminum alloy composites prepared by hot-press molding","authors":"J. Qiu, Sulan Li, Di Cai, Ning Gao, Weili Zhang, Youbing Li, T. Xia, Chaolong Yang","doi":"10.1080/00218464.2023.2165442","DOIUrl":"https://doi.org/10.1080/00218464.2023.2165442","url":null,"abstract":"ABSTRACT Polymer-metal hybrids were prepared by using the ultrasonic-assisted hot-press molding process. The surface of the aluminum alloy is anodized to produce nano-pores with a pore size distribution of 60 to 210 nm. The surface of the anodized aluminum alloy is soaked with a silane coupling agent solution to alter its surface polarity. In addition, PP-g-MAH was used to alter the polarity of polypropylene. The structure and properties of the composites were investigated by tensile shear tests, the microstructure of the bonding interface, and elemental analysis. The results show that adding silane coupling agents can create a chemical connection based on the mechanical interlocking structure of the composite bonding interface, leading to an increase in tensile shear strength. When the aluminum alloy surface was treated with a silane coupling agent with a volume fraction of 4%, the tensile shear strength reached 21.02 MPa, increasing by 20.32% compared to the specimen without the silane coupling agent treatment.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"1973 - 1995"},"PeriodicalIF":2.2,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46327695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-04DOI: 10.1080/00218464.2022.2160240
S. Gallas, Iman Sabahi, L. Van Belle, Jan Croes, F. Naets, W. Desmet
ABSTRACT In the past decades, an increasing trend towards the structural combination of lightweight materials and traditional metals has been observed. For these multi-material interfaces, traditional joining technologies such as bolting and welding have to be re-thought and adhesive bonds can be a valid alternative. The substitution of the joints has an impact on the stiffness, damping, and mass distribution of the entire assembly and should be taken into account while designing for NVH, durability, and performance. The aim of this work is to experimentally compare the effect of bolts and adhesive bonding on the vibrational response of the assembly, in terms of modal frequency, shape, and damping. Plate-to-plate single lap joints are tested under transverse vibration. In particular, we compare one M4 bolted connection and three adhesive connections, respectively, realized with stiff epoxy, flexible foam tape, and toughened acrylic. Results show that, in a low-mid frequency region between 0 and 250 Hz, the substitution of bolts with adhesives has a limited influence on mode shapes but can lead up to a 6-fold increase of the modal damping values and 10% increase of the modal frequencies.
{"title":"The influence of adhesive materials on the transverse vibrations of single lap joints: an experimental study","authors":"S. Gallas, Iman Sabahi, L. Van Belle, Jan Croes, F. Naets, W. Desmet","doi":"10.1080/00218464.2022.2160240","DOIUrl":"https://doi.org/10.1080/00218464.2022.2160240","url":null,"abstract":"ABSTRACT In the past decades, an increasing trend towards the structural combination of lightweight materials and traditional metals has been observed. For these multi-material interfaces, traditional joining technologies such as bolting and welding have to be re-thought and adhesive bonds can be a valid alternative. The substitution of the joints has an impact on the stiffness, damping, and mass distribution of the entire assembly and should be taken into account while designing for NVH, durability, and performance. The aim of this work is to experimentally compare the effect of bolts and adhesive bonding on the vibrational response of the assembly, in terms of modal frequency, shape, and damping. Plate-to-plate single lap joints are tested under transverse vibration. In particular, we compare one M4 bolted connection and three adhesive connections, respectively, realized with stiff epoxy, flexible foam tape, and toughened acrylic. Results show that, in a low-mid frequency region between 0 and 250 Hz, the substitution of bolts with adhesives has a limited influence on mode shapes but can lead up to a 6-fold increase of the modal damping values and 10% increase of the modal frequencies.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"1809 - 1831"},"PeriodicalIF":2.2,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45219826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-04DOI: 10.1080/00218464.2022.2163894
K. Akaike, H. Akiyama
ABSTRACT Adhesive technology can joint dissimilar lightweight materials that are used in the automotive industry to improve fuel efficiency. However, the strength of the adhesive bonding is often reduced by oil contaminants on the adherend surfaces. Adhesives should repel the oil layer and diffuse onto the adherend surface, but there is no general design for reliable adhesion on contaminated adherends because of the poor molecular-level understanding of oil-surface adhesion. Here, we report the direct observation of oil-surface adhesion at a two-part epoxy adhesive/aluminum oxide (AlOx) interface via sum frequency generation (SFG) spectroscopy, a method that can probe buried interfaces. The AlOx surface is intentionally contaminated with commercial silicone oil. The SFG spectra of the cured epoxy adhesive/oil-contaminated AlOx interface suggest that the silicone oil remains after curing, explaining the reduction in adhesion strength. Triethylenetetramine, a hardener used in this study, can repel the oil layer, whereas bisphenol A epoxy resin is much less effective at removing the oil layer upon contact. Thus, the migration of both adhesive components onto the AlOx surface is key to securing sufficient oil-surface adhesion. We also applied SFG to second-generation acryl adhesive (SGAA)/AlOx interface and found that SGAA completely repels the oil from the aluminum interface.
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