Yuting Wang, Zhengxiang Huang, X. Zu, B. Ma, You-er Cai
Abstract The jet morphology of square and circular cross-section shaped charge with same inscribed circle diameter were observed by conducting an X-ray experiment. Depth-of-penetration tests at standoffs 80 and 160 mm were also carried out. The jet formation was studied by using AUTODYN software. The results showed that the jet of square cross-section shaped charge consists of a condensed part and a non-condensed part. The condensed part has similar characteristics to the corresponding part of circular cross-section shaped charge. And the non-condensed part is distributed at the jet tail. The non-condensed part consists of a main fluid moving along the axis and four off-axis fluids with off-axis velocity along the symmetry plane. The non-condensing of jet reduces the penetration depth of square cross-section shaped charge, the decreasing rate increased from 2.67% to 17.3% when the standoff is increased from 80 mm to 160 mm. When the inscribed circle diameter of the charge cross-section increases to 67.2 mm (1.2 times of 56 mm) and the liner structure remains the same, the square cross-section shaped charge will form a cohesive jet.
{"title":"Experimental Study on Jet Formation and Penetration Characteristics of Square cross-section Shaped Charge","authors":"Yuting Wang, Zhengxiang Huang, X. Zu, B. Ma, You-er Cai","doi":"10.1590/1679-78256514","DOIUrl":"https://doi.org/10.1590/1679-78256514","url":null,"abstract":"Abstract The jet morphology of square and circular cross-section shaped charge with same inscribed circle diameter were observed by conducting an X-ray experiment. Depth-of-penetration tests at standoffs 80 and 160 mm were also carried out. The jet formation was studied by using AUTODYN software. The results showed that the jet of square cross-section shaped charge consists of a condensed part and a non-condensed part. The condensed part has similar characteristics to the corresponding part of circular cross-section shaped charge. And the non-condensed part is distributed at the jet tail. The non-condensed part consists of a main fluid moving along the axis and four off-axis fluids with off-axis velocity along the symmetry plane. The non-condensing of jet reduces the penetration depth of square cross-section shaped charge, the decreasing rate increased from 2.67% to 17.3% when the standoff is increased from 80 mm to 160 mm. When the inscribed circle diameter of the charge cross-section increases to 67.2 mm (1.2 times of 56 mm) and the liner structure remains the same, the square cross-section shaped charge will form a cohesive jet.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47070604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract In the present work the performance of finite element formulations with different reduced integration strategies is evaluated for Contact Mechanics applications. One-point quadrature and selective reduced integration are utilized here using hourglass control to suppress volumetric and shear locking for materials with incompressible plastic behavior and bending-dominated problems. A corotational formulation is adopted to deal with physically and geometrically nonlinear analysis and the generalized-α method is employed for time integration in the nonlinear dynamic range. The contact formulation is based on the penalty method, where the classical Coulomb’s law is used considering a convected coordinate system for three-dimensional friction with large deformation and finite sliding. Contact problems involving deformable and rigid bodies, as well as static and dynamic analysis, are investigated and results are analyzed considering the different underintegration formulations proposed here.
{"title":"A numerical investigation on Contact Mechanics applications using eight-node hexahedral elements with underintegration techniques","authors":"M. Visintainer, E. Bittencourt, A. L. Braun","doi":"10.1590/1679-78256441","DOIUrl":"https://doi.org/10.1590/1679-78256441","url":null,"abstract":"Abstract In the present work the performance of finite element formulations with different reduced integration strategies is evaluated for Contact Mechanics applications. One-point quadrature and selective reduced integration are utilized here using hourglass control to suppress volumetric and shear locking for materials with incompressible plastic behavior and bending-dominated problems. A corotational formulation is adopted to deal with physically and geometrically nonlinear analysis and the generalized-α method is employed for time integration in the nonlinear dynamic range. The contact formulation is based on the penalty method, where the classical Coulomb’s law is used considering a convected coordinate system for three-dimensional friction with large deformation and finite sliding. Contact problems involving deformable and rigid bodies, as well as static and dynamic analysis, are investigated and results are analyzed considering the different underintegration formulations proposed here.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47418516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Sadeghi, Mohammad Seyedkazemi, A. Khajehdezfuly
Abstract In this paper, effect of uncertainty of fastening system properties on the wheel/rail dynamic force (WRDF) was investigated. For this purpose, two deterministic and epistemic models of vehicle/track interaction were developed, using the finite element method. Validity of the results obtained from the models was shown through comparison between the model results and those obtained from field tests. The effects of uncertainty of fastening system properties on the WRDF in different axle loads, vehicle speeds, rail irregularities and various track maintenance conditions were derived through probability and sensitivity analyses. Using the results obtained, some contours were developed to obtain the amplification of WRDF (due the uncertainty of fastening system properties) as a function of vehicle axle load, vehicle speed and track maintenance conditions.
{"title":"Effect of uncertainty of fastening systems properties on wheel/rail dynamic force","authors":"J. Sadeghi, Mohammad Seyedkazemi, A. Khajehdezfuly","doi":"10.1590/1679-78256537","DOIUrl":"https://doi.org/10.1590/1679-78256537","url":null,"abstract":"Abstract In this paper, effect of uncertainty of fastening system properties on the wheel/rail dynamic force (WRDF) was investigated. For this purpose, two deterministic and epistemic models of vehicle/track interaction were developed, using the finite element method. Validity of the results obtained from the models was shown through comparison between the model results and those obtained from field tests. The effects of uncertainty of fastening system properties on the WRDF in different axle loads, vehicle speeds, rail irregularities and various track maintenance conditions were derived through probability and sensitivity analyses. Using the results obtained, some contours were developed to obtain the amplification of WRDF (due the uncertainty of fastening system properties) as a function of vehicle axle load, vehicle speed and track maintenance conditions.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47138043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hussein Al-kroom, Mujahed Thneibat, Yassin Alghrir, V. Schmid
Abstract This paper investigates the behavior of a new form of V-shaped shear connector. The assessment of the proposed connector’s performance is conducted through an experimental work of fourteen push-out tests. The results show that the developed V-shaped shear connector is able to transfer higher shear load than the conventional shear connectors. In addition, its behavior is considered as ductile. Geometrical parameters of the connector are studied to observe their influence on its behavior. The experimental outcomes show that changing the length, width, and thickness of the connector significantly affects its ultimate strength while the connector's ductile behavior is preserved. Furthermore, the work proves that neither creating holes nor adding transverse reinforcement to the connector has significant effect on shear resistance and that the uplift-displacement of the connector is improved. A comprehensive comparison between the proposed shear connector and commonly used shear connectors is executed. Based on the experimental results, an empirical equation is suggested to predict the load capacity of the connector.
{"title":"An experimental investigation of new bent V-shaped shear connector","authors":"Hussein Al-kroom, Mujahed Thneibat, Yassin Alghrir, V. Schmid","doi":"10.1590/1679-78256438","DOIUrl":"https://doi.org/10.1590/1679-78256438","url":null,"abstract":"Abstract This paper investigates the behavior of a new form of V-shaped shear connector. The assessment of the proposed connector’s performance is conducted through an experimental work of fourteen push-out tests. The results show that the developed V-shaped shear connector is able to transfer higher shear load than the conventional shear connectors. In addition, its behavior is considered as ductile. Geometrical parameters of the connector are studied to observe their influence on its behavior. The experimental outcomes show that changing the length, width, and thickness of the connector significantly affects its ultimate strength while the connector's ductile behavior is preserved. Furthermore, the work proves that neither creating holes nor adding transverse reinforcement to the connector has significant effect on shear resistance and that the uplift-displacement of the connector is improved. A comprehensive comparison between the proposed shear connector and commonly used shear connectors is executed. Based on the experimental results, an empirical equation is suggested to predict the load capacity of the connector.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41788957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract In this study, we investigated the preconsolidation pressure (P C) of sedimentary soft rock and its relationship with brittle-ductile transition (BDT) pressure. We proposed a generalized preconsolidation pressure (P G) suitable for both soil and sedimentary soft rock, which is defined in terms of the yield stress of the initial sediment structure under confined lateral compression. We then explored the digenetic effect on P G using 24 sediment types. Next, P G and BDT pressure were verified using confined compression and conventional triaxial tests, respectively, on red-bed soft rock in the Dingxi region of China. Finally, we discussed the BDT mechanism and analyzed the relationship between the two characteristic pressures for a given initial yield surface considered structural strength. We found that the relationship was dependent on the strength parameters, the initial structural strength, and the coefficient of earth pressure at rest. The findings of this study will have a significant impact on the determination of BDT pressure of sedimentary rock in future studies.
{"title":"The relationship between generalized preconsolidation pressure and brittle-ductile transition pressure in sedimentary soft rock","authors":"L. Lv, H. Liao, Li Song, H. Li, Yingpeng Fu","doi":"10.1590/1679-78256347","DOIUrl":"https://doi.org/10.1590/1679-78256347","url":null,"abstract":"Abstract In this study, we investigated the preconsolidation pressure (P C) of sedimentary soft rock and its relationship with brittle-ductile transition (BDT) pressure. We proposed a generalized preconsolidation pressure (P G) suitable for both soil and sedimentary soft rock, which is defined in terms of the yield stress of the initial sediment structure under confined lateral compression. We then explored the digenetic effect on P G using 24 sediment types. Next, P G and BDT pressure were verified using confined compression and conventional triaxial tests, respectively, on red-bed soft rock in the Dingxi region of China. Finally, we discussed the BDT mechanism and analyzed the relationship between the two characteristic pressures for a given initial yield surface considered structural strength. We found that the relationship was dependent on the strength parameters, the initial structural strength, and the coefficient of earth pressure at rest. The findings of this study will have a significant impact on the determination of BDT pressure of sedimentary rock in future studies.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47059094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Habib, A. Houri, M. Habib, Ahmed Elzokra, U. Yildirim
Abstract There is no doubt that concrete is one of the most consumed materials all over the world. It is a composite mix widely used for constructing structures and infrastructures to sustain environmentally induced stresses such as thermal and seismic. As the mainstream of construction industry is tended to find out feasible solutions, Roller Compacted Concrete (RCC) was introduced to play an essential role in the development of dams and pavements, where over 550 RCC dams were created by the end of 2012. In fact, this material has the same basic constituents of conventional concrete with a zero-slump and a significant difference in the placing process. The majority of available studies in the literature are composed of numerical investigations to assess the thermal and seismic behavior of RCC dams and to provide a clear view on how to improve its performance under various loading conditions. This paper summarizes and compares the general conclusions of recent works on evaluating the structural performance of RCC dams.
{"title":"Structural Performance and Finite Element Modeling of Roller Compacted Concrete Dams: A Review","authors":"A. Habib, A. Houri, M. Habib, Ahmed Elzokra, U. Yildirim","doi":"10.1590/1679-78256467","DOIUrl":"https://doi.org/10.1590/1679-78256467","url":null,"abstract":"Abstract There is no doubt that concrete is one of the most consumed materials all over the world. It is a composite mix widely used for constructing structures and infrastructures to sustain environmentally induced stresses such as thermal and seismic. As the mainstream of construction industry is tended to find out feasible solutions, Roller Compacted Concrete (RCC) was introduced to play an essential role in the development of dams and pavements, where over 550 RCC dams were created by the end of 2012. In fact, this material has the same basic constituents of conventional concrete with a zero-slump and a significant difference in the placing process. The majority of available studies in the literature are composed of numerical investigations to assess the thermal and seismic behavior of RCC dams and to provide a clear view on how to improve its performance under various loading conditions. This paper summarizes and compares the general conclusions of recent works on evaluating the structural performance of RCC dams.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48113515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Zhao, Yongmei Zhu, Xialei He, Xilu Zhao, Baoji Yin
Abstract This paper focuses on the wall reinforcement design of toroidal shells with openings. Five 304 stainless steel test models were manufactured, and geometric measurements, three-dimensional scanning, and hydrostatic tests were carried out. The scanning models were established according to the measured geometrical imperfections. Linear buckling analysis (LBA), geometrically and materially nonlinear analysis (GMNA), and geometrically and materially nonlinear analysis with imperfections (GMNIA) were used for numerical simulations. The test results were in good agreement with the numerical analysis results, and an effective finite element method was obtained. Finally, 51 numerical simulations were established to study the influence of the size, number, and shape of openings on the buckling load performance of the toroidal shell with openings.
{"title":"Reinforcement design and buckling analysis of toroidal shell with openings","authors":"B. Zhao, Yongmei Zhu, Xialei He, Xilu Zhao, Baoji Yin","doi":"10.1590/1679-78256473","DOIUrl":"https://doi.org/10.1590/1679-78256473","url":null,"abstract":"Abstract This paper focuses on the wall reinforcement design of toroidal shells with openings. Five 304 stainless steel test models were manufactured, and geometric measurements, three-dimensional scanning, and hydrostatic tests were carried out. The scanning models were established according to the measured geometrical imperfections. Linear buckling analysis (LBA), geometrically and materially nonlinear analysis (GMNA), and geometrically and materially nonlinear analysis with imperfections (GMNIA) were used for numerical simulations. The test results were in good agreement with the numerical analysis results, and an effective finite element method was obtained. Finally, 51 numerical simulations were established to study the influence of the size, number, and shape of openings on the buckling load performance of the toroidal shell with openings.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45051085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yiming Li, Wenbin Li, Junhao Liu, Bo Pu, Qing Zhang, Xiaoming Wang
LIMITED INITIATION ENERGY OR EXTERNAL STIMULATION MAY CAUSE INCOMPLETE DETONATION IN A WARHEAD. AT PRESENT, THERE IS NO QUANTITATIVE METHOD TO CHARACTERIZE THE ENERGY RELEASE OF A WARHEAD CHARGE FOR INCOMPLETE DETONATION SUCH AS EXPLOSION AND DEFLAGRATION. WE PROPOSE A METHOD BASED ON AVERAGE FRAGMENT QUALITY TO CHARACTERIZE THE ENERGY RELEASED BY A WARHEAD CHARGE. THE THEORETICAL STUDY SHOWS THAT THE AVERAGE FRAGMENT QUALITY AFTER WARHEAD INITIATION IS INVERSELY PROPORTIONAL TO THE INITIAL FRAGMENT VELOCITY. THE RELATIONSHIP BETWEEN THE AVERAGE FRAGMENT QUALITY AND EXPLOSIVE ENERGY RELEASE IS ESTABLISHED AND VERIFIED BY EXPERIMENT. THIS RELATION CAN BE USED TO DETERMINE THE CHARGE ENERGY RELEASED AFTER WARHEAD INITIATION. IT PROVIDES A THEORETICAL BASIS FOR OPTIMIZING EFFICIENCY OF CHARGE ENERGY USE IN HIGH-ENERGY CONVENTIONAL DAMAGE TECHNOLOGY AND WARHEAD DESIGN, AND PROVIDES A QUANTITATIVE METHOD FOR EVALUATING INSENSITIVE AMMUNITION.
{"title":"Method of evaluating energy released by a warhead charge based on average fragment quality","authors":"Yiming Li, Wenbin Li, Junhao Liu, Bo Pu, Qing Zhang, Xiaoming Wang","doi":"10.1590/1679-78256481","DOIUrl":"https://doi.org/10.1590/1679-78256481","url":null,"abstract":"LIMITED INITIATION ENERGY OR EXTERNAL STIMULATION MAY CAUSE INCOMPLETE DETONATION IN A WARHEAD. AT PRESENT, THERE IS NO QUANTITATIVE METHOD TO CHARACTERIZE THE ENERGY RELEASE OF A WARHEAD CHARGE FOR INCOMPLETE DETONATION SUCH AS EXPLOSION AND DEFLAGRATION. WE PROPOSE A METHOD BASED ON AVERAGE FRAGMENT QUALITY TO CHARACTERIZE THE ENERGY RELEASED BY A WARHEAD CHARGE. THE THEORETICAL STUDY SHOWS THAT THE AVERAGE FRAGMENT QUALITY AFTER WARHEAD INITIATION IS INVERSELY PROPORTIONAL TO THE INITIAL FRAGMENT VELOCITY. THE RELATIONSHIP BETWEEN THE AVERAGE FRAGMENT QUALITY AND EXPLOSIVE ENERGY RELEASE IS ESTABLISHED AND VERIFIED BY EXPERIMENT. THIS RELATION CAN BE USED TO DETERMINE THE CHARGE ENERGY RELEASED AFTER WARHEAD INITIATION. IT PROVIDES A THEORETICAL BASIS FOR OPTIMIZING EFFICIENCY OF CHARGE ENERGY USE IN HIGH-ENERGY CONVENTIONAL DAMAGE TECHNOLOGY AND WARHEAD DESIGN, AND PROVIDES A QUANTITATIVE METHOD FOR EVALUATING INSENSITIVE AMMUNITION.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45659893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
THE INTERFACIAL STRESS IN A CARBON FIBER-REINFORCED POLYMER (CFRP) PLATE FOR STRENGTHENING THE TOP FLANGE OF A BOX-GIRDER BRIDGE WAS THEORETICALLY INVESTIGATED. ACCORDING TO THE FORCE ANALYSIS RESULTS FOR THE BOX-GIRDER STRUCTURE, THE MOST UNFAVORABLE FORCE AREA WAS SELECTED FOR MODELING ANALYSIS. USING THE SIMPLIFIED BEAM MODEL, A CFRP PLATE–CONCRETE INTERFACIAL-STRESS CALCULATION MODEL WAS DERIVED, AND A CLOSED-FORM SOLUTION FOR THE CALCULATION MODEL WAS OBTAINED. EQUIVALENT SIMPLIFIED TEST SPECIMENS WERE DESIGNED ACCORDING TO THE BOX-GIRDER STRUCTURE TO VERIFY THE RELIABILITY OF THE THEORETICAL MODEL. THEN, FOUR-POINT BENDING TESTS OF THE SAMPLE WERE PERFORMED. IN THESE TESTS, THE DEBONDING FAILURE MODES AND STRAIN IN THE CFRP PLATE WERE EXAMINED. THE CFRP PLATE–CONCRETE INTERFACIAL STRESS WAS CALCULATED ACCORDING TO THE STRAIN DATA OF THE CFRP PLATE IN THE EXPERIMENTAL TESTS. THE EXPERIMENTAL RESULTS WERE THEN COMPARED WITH THE THEORETICAL RESULTS. FURTHERMORE, THE CORRESPONDING INTERFACIAL STRESSES WERE CALCULATED AND COMPARED ACCORDING TO THE DIFFERENT LOAD LEVELS SPECIFIED IN THE CODE. A SERIES OF THEORETICAL AND EXPERIMENTAL COMPARISONS WERE PERFORMED TO VERIFY THE RELIABILITY OF THE PROPOSED CFRP–CONCRETE INTERFACIAL STRESS CLOSED-FORM SOLUTION MODEL.
{"title":"Debonding behavior and interfacial stress in carbon fiber-reinforced polymer plate-strengthened top flange of box-girder bridge","authors":"Xin Yuan, Chen-Nan Sun, Qinqing Li, Chaoyu Zhu, Shoujing Tang","doi":"10.1590/1679-78256271","DOIUrl":"https://doi.org/10.1590/1679-78256271","url":null,"abstract":"THE INTERFACIAL STRESS IN A CARBON FIBER-REINFORCED POLYMER (CFRP) PLATE FOR STRENGTHENING THE TOP FLANGE OF A BOX-GIRDER BRIDGE WAS THEORETICALLY INVESTIGATED. ACCORDING TO THE FORCE ANALYSIS RESULTS FOR THE BOX-GIRDER STRUCTURE, THE MOST UNFAVORABLE FORCE AREA WAS SELECTED FOR MODELING ANALYSIS. USING THE SIMPLIFIED BEAM MODEL, A CFRP PLATE–CONCRETE INTERFACIAL-STRESS CALCULATION MODEL WAS DERIVED, AND A CLOSED-FORM SOLUTION FOR THE CALCULATION MODEL WAS OBTAINED. EQUIVALENT SIMPLIFIED TEST SPECIMENS WERE DESIGNED ACCORDING TO THE BOX-GIRDER STRUCTURE TO VERIFY THE RELIABILITY OF THE THEORETICAL MODEL. THEN, FOUR-POINT BENDING TESTS OF THE SAMPLE WERE PERFORMED. IN THESE TESTS, THE DEBONDING FAILURE MODES AND STRAIN IN THE CFRP PLATE WERE EXAMINED. THE CFRP PLATE–CONCRETE INTERFACIAL STRESS WAS CALCULATED ACCORDING TO THE STRAIN DATA OF THE CFRP PLATE IN THE EXPERIMENTAL TESTS. THE EXPERIMENTAL RESULTS WERE THEN COMPARED WITH THE THEORETICAL RESULTS. FURTHERMORE, THE CORRESPONDING INTERFACIAL STRESSES WERE CALCULATED AND COMPARED ACCORDING TO THE DIFFERENT LOAD LEVELS SPECIFIED IN THE CODE. A SERIES OF THEORETICAL AND EXPERIMENTAL COMPARISONS WERE PERFORMED TO VERIFY THE RELIABILITY OF THE PROPOSED CFRP–CONCRETE INTERFACIAL STRESS CLOSED-FORM SOLUTION MODEL.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47917211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
THE INFLUENCE OF SINGLE AND MULTIPLE IMPERFECTION CASES ON THE LOAD CARRYING CAPACITY OF MILD STEEL CONE SUBJECTED TO AXIAL COMPRESSION WAS CONSIDERED THROUGH NUMERICAL SIMULATION IN THE CURRENT PAPER. THREE DIFFERENT IMPERFECTION TECHNIQUES WERE CONSIDERED, WHICH ARE: I) UNEVEN AXIAL LENGTH (SINUSOIDAL/SQUARE WAVES), II) CRACK, AND III) SINGLE LOAD INDENTATION (SLI) IMPERFECTION. ABAQUS 6.19 FE WAS USED TO CARRY OUT THE NUMERICAL SIMULATION. THE AXIAL COMPRESSIVE LOAD WAS APPLIED AT THE SMALL RADIUS OF THE CONE. RESULTS SHOWED THAT THE BUCKLING LOAD OF AXIALLY COMPRESSED MILD STEEL CONE DEPENDS ON THE IMPERFECTION APPROACH IMPLEMENTED. THE BUCKLING LOAD OF CONES WERE SEEN TO BE HEAVILY AFFECTED BY UNEVEN AXIAL LENGTH IMPERFECTION FOR BOTH SINGLE AND MULTIPLE IMPERFECTION. ALSO, THE EFFECT OF MULTIPLE IMPERFECTION IS MORE NOTICEABLE AT HIGHER R1/T.
{"title":"Buckling of Axially Compressed Conical Shells with Multiple Imperfections","authors":"F. Mahidan, O. Ifayefunmi","doi":"10.1590/1679-78256376","DOIUrl":"https://doi.org/10.1590/1679-78256376","url":null,"abstract":"THE INFLUENCE OF SINGLE AND MULTIPLE IMPERFECTION CASES ON THE LOAD CARRYING CAPACITY OF MILD STEEL CONE SUBJECTED TO AXIAL COMPRESSION WAS CONSIDERED THROUGH NUMERICAL SIMULATION IN THE CURRENT PAPER. THREE DIFFERENT IMPERFECTION TECHNIQUES WERE CONSIDERED, WHICH ARE: I) UNEVEN AXIAL LENGTH (SINUSOIDAL/SQUARE WAVES), II) CRACK, AND III) SINGLE LOAD INDENTATION (SLI) IMPERFECTION. ABAQUS 6.19 FE WAS USED TO CARRY OUT THE NUMERICAL SIMULATION. THE AXIAL COMPRESSIVE LOAD WAS APPLIED AT THE SMALL RADIUS OF THE CONE. RESULTS SHOWED THAT THE BUCKLING LOAD OF AXIALLY COMPRESSED MILD STEEL CONE DEPENDS ON THE IMPERFECTION APPROACH IMPLEMENTED. THE BUCKLING LOAD OF CONES WERE SEEN TO BE HEAVILY AFFECTED BY UNEVEN AXIAL LENGTH IMPERFECTION FOR BOTH SINGLE AND MULTIPLE IMPERFECTION. ALSO, THE EFFECT OF MULTIPLE IMPERFECTION IS MORE NOTICEABLE AT HIGHER R1/T.","PeriodicalId":18192,"journal":{"name":"Latin American Journal of Solids and Structures","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46033776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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