Pub Date : 2025-01-31DOI: 10.1016/j.ijfatigue.2025.108837
Dongdong Ji , Haodong Chen , Jiwang Zhang , Kaixin Su , Xingyu Chen
Ti-6Al-4V alloy is subjected to complex environmental conditions, often requiring enhanced fatigue performance in engineering applications. This study provides a comparative analysis of the effects of micro-shot peening (MSP) and traditional shot peening (TSP) on the fatigue performance of Ti-6Al-4V alloy. The results indicate that TSP specimens develop a work-hardened layer with high hardness and elevated compressive residual stress (CRS) on the surface, whereas MSP specimens exhibit lower surface roughness and a grain refinement layer with a higher degree of refinement and more uniform grain distribution. Fatigue testing revealed that, compared to unpeened (UP) specimens, the fatigue strength of MSP and TSP specimens increased by 42 % and 17 %, respectively, after 2 × 107 loading cycles. Shot peening modified the fracture mechanisms of the titanium alloy, introducing a critical stress below which crack initiation shifts from the surface to the subsurface. MSP specimens demonstrated a higher critical stress, resulting in significantly longer fatigue life compared to TSP specimens.
{"title":"Influence of micro-shot peening and traditional shot peening on fatigue performance and fracture behaviors of Ti-6Al-4V alloy","authors":"Dongdong Ji , Haodong Chen , Jiwang Zhang , Kaixin Su , Xingyu Chen","doi":"10.1016/j.ijfatigue.2025.108837","DOIUrl":"10.1016/j.ijfatigue.2025.108837","url":null,"abstract":"<div><div>Ti-6Al-4V alloy is subjected to complex environmental conditions, often requiring enhanced fatigue performance in engineering applications. This study provides a comparative analysis of the effects of micro-shot peening (MSP) and traditional shot peening (TSP) on the fatigue performance of Ti-6Al-4V alloy. The results indicate that TSP specimens develop a work-hardened layer with high hardness and elevated compressive residual stress (CRS) on the surface, whereas MSP specimens exhibit lower surface roughness and a grain refinement layer with a higher degree of refinement and more uniform grain distribution. Fatigue testing revealed that, compared to unpeened (UP) specimens, the fatigue strength of MSP and TSP specimens increased by 42 % and 17 %, respectively, after 2 × 10<sup>7</sup> loading cycles. Shot peening modified the fracture mechanisms of the titanium alloy, introducing a critical stress below which crack initiation shifts from the surface to the subsurface. MSP specimens demonstrated a higher critical stress, resulting in significantly longer fatigue life compared to TSP specimens.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108837"},"PeriodicalIF":5.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-31DOI: 10.1016/j.ijfatigue.2025.108844
Ning Guo , Kuantao Sun , Bingtao Tang , Fu Guo , Guangchun Xiao , Jilai Wang
The large-scale wind power spindles are prone to fatigue failure under cyclic loading, particularly, due to microstructure inhomogeneity of tempered large-scale forgings, it is of great significance to explore the influence of non-uniform tempered sorbite/bainite (TS/B) on fatigue crack propagation and closure effects. In this paper, the fatigue crack propagation behavior of coarse TS/B and fine TS/B were investigated. The results show that the fine TS/B with higher microstructure refinement have higher fatigue life compared to the coarse TS/B due to the tortuous fatigue crack propagation path. In the low ΔK region, due to roughness induced crack closure (RICC), the coarse TS/B exhibits a more tortuous fatigue crack propagation path, thereby leading to higher resistance to fatigue crack propagation. In the medium ΔK region, the coarse TS/B exhibiting a large plastic region size (Δrp) tends to absorb dislocations, enhance energy release at the crack tip and reduce fatigue crack propagation rate (FCPR). In contrast, the fine TS/B are prone to crack deflection at the phase boundaries of refined TS/B due to higher misorientation (MO), resulting in decreasing FCPR. In addition, compared with the coarse TS/B, the fine TS/B is more likely to generate microcracks and reduce the FCPR of the primary crack in the regions with high Schmid factor (SF) and low Taylor factor (TF). The {110} < 111 > slip system has a low slip resistance in the fine TS/B, and the primary crack propagation of the fine TS/B is preferentially in the {110} < 111 > slip system at high SF, which accelerates the FCPR.
{"title":"Effect of tempered sorbite/bainite microstructures on fatigue crack propagation and closure in Fe-Cr-Mo-Mn steel","authors":"Ning Guo , Kuantao Sun , Bingtao Tang , Fu Guo , Guangchun Xiao , Jilai Wang","doi":"10.1016/j.ijfatigue.2025.108844","DOIUrl":"10.1016/j.ijfatigue.2025.108844","url":null,"abstract":"<div><div>The large-scale wind power spindles are prone to fatigue failure under cyclic loading, particularly, due to microstructure inhomogeneity of tempered large-scale forgings, it is of great significance to explore the influence of non-uniform tempered sorbite/bainite (TS/B) on fatigue crack propagation and closure effects. In this paper, the fatigue crack propagation behavior of coarse TS/B and fine TS/B were investigated. The results show that the fine TS/B with higher microstructure refinement have higher fatigue life compared to the coarse TS/B due to the tortuous fatigue crack propagation path. In the low ΔK region, due to roughness induced crack closure (RICC), the coarse TS/B exhibits a more tortuous fatigue crack propagation path, thereby leading to higher resistance to fatigue crack propagation. In the medium ΔK region, the coarse TS/B exhibiting a large plastic region size (Δr<sub>p</sub>) tends to absorb dislocations, enhance energy release at the crack tip and reduce fatigue crack propagation rate (FCPR). In contrast, the fine TS/B are prone to crack deflection at the phase boundaries of refined TS/B due to higher misorientation (MO), resulting in decreasing FCPR. In addition, compared with the coarse TS/B, the fine TS/B is more likely to generate microcracks and reduce the FCPR of the primary crack in the regions with high Schmid factor (SF) and low Taylor factor (TF). The {110} < 111 > slip system has a low slip resistance in the fine TS/B, and the primary crack propagation of the fine TS/B is preferentially in the {110} < 111 > slip system at high SF, which accelerates the FCPR.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108844"},"PeriodicalIF":5.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-30DOI: 10.1016/j.ijfatigue.2025.108840
Huan Wang, Weifeng Xu, Yanfei Wang, Hongjian Lu
Creep-fatigue behavior of a friction stir welding (FSW) Al-Zn-Mg-Cu alloy at different temperatures was investigated. The results show that creep damage is much higher than fatigue damage when a holding time is introduced at the peak load. After creep-fatigue, η’ and η phases are reprecipitated in the weld nugget zone (WNZ) and coarsen with increasing temperature. When the creep-fatigue temperature is below 175 °C, the predominant deformation mechanism is dislocation slip in the heat affected zone (HAZ). The Hall-Petch relationship prevails and thus the fine-grained WNZ is strengthened. The voids and microcracks nucleate at the interiors of coarse second phase particles or interfaces between the matrix and second phases. The FSW joints are fractured at the HAZ, characterized by the transgranular ductile fracture mode. Grain boundary ledges are observed in the WNZ at the creep-fatigue temperature of 200°C, suggesting the occurrence of grain boundary sliding. The plastic deformation of FSW joints is governed by GB-mediated deformation mechanism in the WNZ, indicating the inverse Hall-Petch behavior. Intergranular voids or microcracks initiate from grain boundaries with low values of the Schmid factor and geometric compatibility factor. The fracture mode of FSW joints is dominated by the intergranular fracture in the WNZ.
{"title":"Creep-fatigue behavior of a friction stir welding 7050-T7451 aluminum alloy: Microstructure evolution and microscopic damage mechanisms","authors":"Huan Wang, Weifeng Xu, Yanfei Wang, Hongjian Lu","doi":"10.1016/j.ijfatigue.2025.108840","DOIUrl":"10.1016/j.ijfatigue.2025.108840","url":null,"abstract":"<div><div>Creep-fatigue behavior of a friction stir welding (FSW) Al-Zn-Mg-Cu alloy at different temperatures was investigated. The results show that creep damage is much higher than fatigue damage when a holding time is introduced at the peak load. After creep-fatigue, η’ and η phases are reprecipitated in the weld nugget zone (WNZ) and coarsen with increasing temperature. When the creep-fatigue temperature is below 175 °C, the predominant deformation mechanism is dislocation slip in the heat affected zone (HAZ). The Hall-Petch relationship prevails and thus the fine-grained WNZ is strengthened. The voids and microcracks nucleate at the interiors of coarse second phase particles or interfaces between the matrix and second phases. The FSW joints are fractured at the HAZ, characterized by the transgranular ductile fracture mode. Grain boundary ledges are observed in the WNZ at the creep-fatigue temperature of 200°C, suggesting the occurrence of grain boundary sliding. The plastic deformation of FSW joints is governed by GB-mediated deformation mechanism in the WNZ, indicating the inverse Hall-Petch behavior. Intergranular voids or microcracks initiate from grain boundaries with low values of the Schmid factor and geometric compatibility factor. The fracture mode of FSW joints is dominated by the intergranular fracture in the WNZ.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108840"},"PeriodicalIF":5.7,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two polymer foams with density of 0.10 and 0.13 g/cm3 (F10 and F13) respectively were fabricated by steam-welding of expanded beads, obtained from super-critical foaming of poly(ether-b-amide). The compression fatigue behaviors were first characterized by step-increase strain tests up to −60 %, with an increment of 10 %. The stress relaxation rates during every one thousand cycles of compression was approximately 5.5 % and 4 % respectively for F10 and F13, while the energy return rate was kept more than 90 % and 85 % respectively. The stiffness of F13 can be largely kept stable, while that of F10 dropped evidently. Setting the strain from −30 % to −50 %, the long-term dynamic compression tests were performed with 4 Hz for 1 million cycles and 2 million cycles. The compression stress was generally kept unchanged after the foams were stabilized. Four types of damages were found i.e. the fine cracks, the detachment, the penetrated pinholes, and the rupture. Micro-computer tomography quantitatively revealed that the average fraction of damages is 8.95 % and 30.53 % in the visualized slices for the inter-bead surface and intra-bead walls. However, both foams showed nearly zero residual compression set, no detachment of single bead, which denotes the superior fatigue properties of the PEBA foams.
{"title":"Fatigue behaviors and cellular damages of bead-welded foam of poly(ether-b-amide) under cyclic compression","authors":"Ping Zhu , Johannes Meuchelböck , Chao Qiu , Quanxiao Dong , Xia Dong , Dujin Wang , Volker Altstädt , Holger Ruckdäschel","doi":"10.1016/j.ijfatigue.2025.108841","DOIUrl":"10.1016/j.ijfatigue.2025.108841","url":null,"abstract":"<div><div>Two polymer foams with density of 0.10 and 0.13 g/cm<sup>3</sup> (F10 and F13) respectively were fabricated by steam-welding of expanded beads, obtained from super-critical foaming of poly(ether-<em>b</em>-amide). The compression fatigue behaviors were first characterized by step-increase strain tests up to −60 %, with an increment of 10 %. The stress relaxation rates during every one thousand cycles of compression was approximately 5.5 % and 4 % respectively for F10 and F13, while the energy return rate was kept more than 90 % and 85 % respectively. The stiffness of F13 can be largely kept stable, while that of F10 dropped evidently. Setting the strain from −30 % to −50 %, the long-term dynamic compression tests were performed with 4 Hz for 1 million cycles and 2 million cycles. The compression stress was generally kept unchanged after the foams were stabilized. Four types of damages were found i.e. the fine cracks, the detachment, the penetrated pinholes, and the rupture. Micro-computer tomography quantitatively revealed that the average fraction of damages is 8.95 % and 30.53 % in the visualized slices for the inter-bead surface and intra-bead walls. However, both foams showed nearly zero residual compression set, no detachment of single bead, which denotes the superior fatigue properties of the PEBA foams.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108841"},"PeriodicalIF":5.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-28DOI: 10.1016/j.ijfatigue.2025.108845
Jingtai Yu , Bingbing Li , Zuoliang Ning , Xiang Guo , Jun Wu , Gang Chen
The interesting phenomenon of facet cracking of Ti-2Al-2.5Zr alloy exposed to high-cycle fatigue (HCF) loading at the high temperature of 350 °C was reported for the first time. Moreover, the HCF tests at room temperature were also conducted for comparison. The crack nucleation mechanisms with essential differences at both room and elevated temperatures were comparatively studied based on the elaborate characterizations, though the facet cracking was observed in both cases. At room temperature, the facets are parallel to the slip plane with the maximum Schmid factor and tend to crack along the direction of maximum shear stress. In contrast, the facets do not show any preferential crystallographic plane at 350°C and tend to grow in the direction perpendicular to the maximum principal stress, particularly in the grains oriented for multiple slip systems. The difference in terms of the crack initiation was ascribed to different slip behavior of dislocations based on a comprehensive TEM characterization and analysis. The single slip-dominated planar dislocation arrays are activated at room temperature, while the activated multiple slip systems, leading to the formation of three-dimensional dislocation configuration of veins, which is closely related with the dynamic strain aging and dislocation interactions.
{"title":"Facet cracking mechanism of Ti-2Al-2.5Zr alloy under high-cycle fatigue loadings at room temperature and 350°C","authors":"Jingtai Yu , Bingbing Li , Zuoliang Ning , Xiang Guo , Jun Wu , Gang Chen","doi":"10.1016/j.ijfatigue.2025.108845","DOIUrl":"10.1016/j.ijfatigue.2025.108845","url":null,"abstract":"<div><div>The interesting phenomenon of facet cracking of Ti-2Al-2.5Zr alloy exposed to high-cycle fatigue (HCF) loading at the high temperature of 350 °C was reported for the first time. Moreover, the HCF tests at room temperature were also conducted for comparison. The crack nucleation mechanisms with essential differences at both room and elevated temperatures were comparatively studied based on the elaborate characterizations, though the facet cracking was observed in both cases. At room temperature, the facets are parallel to the slip plane with the maximum Schmid factor and tend to crack along the direction of maximum shear stress. In contrast, the facets do not show any preferential crystallographic plane at 350°C and tend to grow in the direction perpendicular to the maximum principal stress, particularly in the grains oriented for multiple slip systems. The difference in terms of the crack initiation was ascribed to different slip behavior of dislocations based on a comprehensive TEM characterization and analysis. The single slip-dominated planar dislocation arrays are activated at room temperature, while the activated multiple slip systems, leading to the formation of three-dimensional dislocation configuration of veins, which is closely related with the dynamic strain aging and dislocation interactions.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108845"},"PeriodicalIF":5.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143194659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-27DOI: 10.1016/j.ijfatigue.2025.108834
E. Tognoli , K. Schricker , E. Bassoli , J.P. Bergmann
The development of hybrid bonds between copper and aluminum is being pursued for reasons of cost, functionality, and weight, particularly in the field of electromobility, to achieve near net-zero emissions. Joining aluminum to copper is a challenge, as interfacial intermetallic compounds have a negative impact on the strength, ductility, and electrical properties of the joint. The development of brittle intermetallic compounds can be limited by targeted temperature control, making solid-phase joining processes particularly suitable. In this article, the fatigue behaviour of friction stir spot welded joints of copper CW004A and aluminum alloy AA1050A with probeless tools is studied. A melt film forms between the metals and the axial force displaces this film laterally, creating an intermediate layer of eutectic and Al2Cu in the joint area. The effect of this layer on the fatigue behaviour of the joint was investigated in this study. At high loads, failure occurs by a combination of Modes I and II with crack propagation in as well as around the bonding area, while at low loads only Mode I is observed. Typically, cracks origin at the spot outer diameter in aluminum, propagate at first in the laterally expelled melt and then through the aluminum sheet, causing unbuttoning.
{"title":"Influence of the eutectic interface on the fatigue behaviour of friction stir spot welds of aluminum with copper","authors":"E. Tognoli , K. Schricker , E. Bassoli , J.P. Bergmann","doi":"10.1016/j.ijfatigue.2025.108834","DOIUrl":"10.1016/j.ijfatigue.2025.108834","url":null,"abstract":"<div><div>The development of hybrid bonds between copper and aluminum is being pursued for reasons of cost, functionality, and weight, particularly in the field of electromobility, to achieve near net-zero emissions. Joining aluminum to copper is a challenge, as interfacial intermetallic compounds have a negative impact on the strength, ductility, and electrical properties of the joint. The development of brittle intermetallic compounds can be limited by targeted temperature control, making solid-phase joining processes particularly suitable. In this article, the fatigue behaviour of friction stir spot welded joints of copper CW004A and aluminum alloy AA1050A with probeless tools is studied. A melt film forms between the metals and the axial force displaces this film laterally, creating an intermediate layer of eutectic and Al<sub>2</sub>Cu in the joint area. The effect of this layer on the fatigue behaviour of the joint was investigated in this study. At high loads, failure occurs by a combination of Modes I and II with crack propagation in as well as around the bonding area, while at low loads only Mode I is observed. Typically, cracks origin at the spot outer diameter in aluminum, propagate at first in the laterally expelled melt and then through the aluminum sheet, causing unbuttoning.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108834"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-27DOI: 10.1016/j.ijfatigue.2025.108842
Xiaopeng Hu , Qing Liu , Liang Chen , Sai Liu , Jinwei Guo , Wang Zhu
The low density, high strength, and excellent high-temperature resistance of ceramic matrix composites (CMCs) determine their significant application value in the extreme environments of advanced aero-engines. In this paper, the thermal shock performance and internal damage evolution of CMCs materials are investigated by X-ray computed tomography (XCT), infrared thermal imaging and acoustic emission (AE) non-destructive testing technologies. The results show that the silicon carbide (SiC) sealing coating on the chemical vapor infiltration – ceramic matrix ccomposites (CVI-CMCs) substrate is severely oxidized and peels off during the cyclic thermal shock process, resulting in exposure and damage to the fiber-reinforced phase and matrix phase. The k-means clustering results of the damage modes of CMCs materials during the thermal shock cycle test can be classified to four damage modes: fiber fracture (280–360 kHz), fiber/matrix crack propagation (225–270 kHz), interlayer spalling (125–165 kHz) and interface debonding or slipping between the fiber and matrix (80–115 kHz). Environmental barrier coatings (EBCs) can enhance the thermal shock resistance of CMC materials. After 900 thermal shock cycles, the peeling area of CVI-CMCs substrate coated with the EBCs is only 15 %, significantly lower than the 25 % observed in uncoated CVI-CMC substrate.
{"title":"Damage analysis of CVI SiCf/SiCm ceramic matrix composites under thermal shock","authors":"Xiaopeng Hu , Qing Liu , Liang Chen , Sai Liu , Jinwei Guo , Wang Zhu","doi":"10.1016/j.ijfatigue.2025.108842","DOIUrl":"10.1016/j.ijfatigue.2025.108842","url":null,"abstract":"<div><div>The low density, high strength, and excellent high-temperature resistance of ceramic matrix composites (CMCs) determine their significant application value in the extreme environments of advanced aero-engines. In this paper, the thermal shock performance and internal damage evolution of CMCs materials are investigated by X-ray computed tomography (XCT), infrared thermal imaging and acoustic emission (AE) non-destructive testing technologies. The results show that the silicon carbide (SiC) sealing coating on the chemical vapor infiltration – ceramic matrix ccomposites (CVI-CMCs) substrate is severely oxidized and peels off during the cyclic thermal shock process, resulting in exposure and damage to the fiber-reinforced phase and matrix phase. The <em>k</em>-means clustering results of the damage modes of CMCs materials during the thermal shock cycle test can be classified to four damage modes: fiber fracture (280–360 kHz), fiber/matrix crack propagation (225–270 kHz), interlayer spalling (125–165 kHz) and interface debonding or slipping between the fiber and matrix (80–115 kHz). Environmental barrier coatings (EBCs) can enhance the thermal shock resistance of CMC materials. After 900 thermal shock cycles, the peeling area of CVI-CMCs substrate coated with the EBCs is only 15 %, significantly lower than the 25 % observed in uncoated CVI-CMC substrate.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108842"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-26DOI: 10.1016/j.ijfatigue.2025.108838
Bin Zhang , Xitong Jin , Yan Zhao , Xunxun Hu , Ziang Wang , Yuancao Li , Haiyan Liu , Dianyin Hu , Rongqiao Wang
Due to the complexity of loads and structures, as well as the uncertainty of transverse crystal orientation, accurately predicting thermomechanical fatigue (TMF) damage in nickel-based single crystal turbine blades remains a challenge. In this paper, a slip-based damage model reflecting the coupling of creep damage and low-cycle fatigue damage was employed to describe the in-phase thermomechanical fatigue (IP TMF) damage behavior of nickel-based single crystal turbine blades. The lifetime prediction results of creep, low-cycle fatigue, and IP TMF based on this model were essentially within a 2x scatter band. Then, the damage model was integrated into the slip-based Walker constitutive model, and the finite element implementation of the improved damage-coupled crystallographic constitutive model was performed using the secondary development tool (User Programmable Features, UPFs) provided by ANSYS. Furthermore, considering the influence of the randomness of transverse crystal orientation, the IP TMF damage of nickel-based single crystal turbine blade was simulated, and the predicted dangerous zone was consistent with the crack initiation zone observed in previous IP TMF experiments.
{"title":"Damage simulation and experimental verification of thermomechanical fatigue in nickel-based single crystal turbine blades considering the influence of transverse crystal orientation","authors":"Bin Zhang , Xitong Jin , Yan Zhao , Xunxun Hu , Ziang Wang , Yuancao Li , Haiyan Liu , Dianyin Hu , Rongqiao Wang","doi":"10.1016/j.ijfatigue.2025.108838","DOIUrl":"10.1016/j.ijfatigue.2025.108838","url":null,"abstract":"<div><div>Due to the complexity of loads and structures, as well as the uncertainty of transverse crystal orientation, accurately predicting thermomechanical fatigue (TMF) damage in nickel-based single crystal turbine blades remains a challenge. In this paper, a slip-based damage model reflecting the coupling of creep damage and low-cycle fatigue damage was employed to describe the in-phase thermomechanical fatigue (IP TMF) damage behavior of nickel-based single crystal turbine blades. The lifetime prediction results of creep, low-cycle fatigue, and IP TMF based on this model were essentially within a 2x scatter band. Then, the damage model was integrated into the slip-based Walker constitutive model, and the finite element implementation of the improved damage-coupled crystallographic constitutive model was performed using the secondary development tool (User Programmable Features, UPFs) provided by ANSYS. Furthermore, considering the influence of the randomness of transverse crystal orientation, the IP TMF damage of nickel-based single crystal turbine blade was simulated, and the predicted dangerous zone was consistent with the crack initiation zone observed in previous IP TMF experiments.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108838"},"PeriodicalIF":5.7,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-26DOI: 10.1016/j.ijfatigue.2025.108839
Dao-Hang Li , Wen-Jing Xu , Tian-Yi Liu , Bowen Zhang , Yi Liu , Yun-Hui Mei
In this paper, the influence of sintering process on the high temperature cyclic deformation behavior and fatigue creep damage mechanism of sintered silver is revealed. Under cyclic shear loading at high temperatures, quasi cleavage fracture that symbolizes creep damage is induced in sintered silver, leading to a decrease in its fatigue life. With the increase of sintering temperature/time, the material properties of sintered silver are enhanced by improving sintering quality, including a decrease in porosity, an increase in grain size, an increase in shear strength, an increase in fatigue life, and a decrease in shear strain amplitude response.
{"title":"Influence of sintering process on high temperature cyclic deformation behavior and fatigue creep damage mechanism of sintered silver","authors":"Dao-Hang Li , Wen-Jing Xu , Tian-Yi Liu , Bowen Zhang , Yi Liu , Yun-Hui Mei","doi":"10.1016/j.ijfatigue.2025.108839","DOIUrl":"10.1016/j.ijfatigue.2025.108839","url":null,"abstract":"<div><div>In this paper, the influence of sintering process on the high temperature cyclic deformation behavior and fatigue creep damage mechanism of sintered silver is revealed. Under cyclic shear loading at high temperatures, quasi cleavage fracture that symbolizes creep damage is induced in sintered silver, leading to a decrease in its fatigue life. With the increase of sintering temperature/time, the material properties of sintered silver are enhanced by improving sintering quality, including a decrease in porosity, an increase in grain size, an increase in shear strength, an increase in fatigue life, and a decrease in shear strain amplitude response.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108839"},"PeriodicalIF":5.7,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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