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The influence of combined gradient structure with residual stress on crack-growth behavior in medium carbon steel
Wang Y(王瑶); Yuan LC; Zhang SJ(张诗嘉); Sun CQ(孙成奇); Wang WJ; Yang GX; Li Q; Wei YJ(魏宇杰)
AbstractGradient materials produced by various external surface treatments are widely used in various mechanical structures. In this study, we illustrated how the combined gradient structure and residual stress influences crack-tip plasticity and crack-growth behavior in medium carbon steel S38C. The material used as train axles has a gradient layer of thickness about 8 mm, with fine nanoscale structures in the surface to microstructures of tens of micron in the core. From the surface, the strength in the gradient layer decreases from about 1600 MPa to about 400 MPa, and the corresponding tensile ductility increases from 2% to 13%. Through in-situ fatigue tests, we further revealed slower crack-initiation and faster crack-growth rate in the gradient samples in contrast to their gradient-free coarse-grain counterparts. Using the key material parameters obtained from experiments, we employed finite-element simulations to examine the crack-growth behavior in the gradient structure with compressive residual stress. We showed that both the gradient structure and compressive residual stress reduce the plastic deformation size and hence slow down crack initiation. However, the lower ductility in the high strength gradient layer gives rise to even faster crack growth after the formation of a sharp crack. Based on the definition of the cyclic Delta J-integral for small scale yielding, we saw lower Delta J in the presence of the residual stress distribution, hence smaller driving force for the crack-growth rate as the latter monotonically increases with Delta J.
KeywordGradient material Residual stress Fatigue crack Cyclic J-integral Crack- growth rate
Indexed BySCI ; EI
WOS IDWOS:000458750800024
WOS Research AreaMechanics
WOS SubjectMechanics
Funding OrganizationNational Natural Science Foundation of China (NSFC) [11425211] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22020200] ; Key Projects in the National Science & Technology Pillar Program [2015BAG12B01-01] ; National Key R&D Program of China [2018YFB1201704-04] ; Basic Scientific Research Foundation of Beijing Jiaotong University [M14JB00130]
ContributorWei, YJ ; Li, Q
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.{Wang, Yao、Yuan, Lichao、Zhang, Shijia、Sun, Chengqi、Wei, Yujie} Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
2.{Wang, Yao、Wang, Wenjing、Yang, Guangxue、Li, Qiang} Beijing Jiaotong Univ, Minist Educ, Key Lab Vehicle Adv Mfg Measuring & Control Techn, Beijing 100044, Peoples R China
3.{Wei, Yujie} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
4.{Yuan, Lichao} Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang Y,Yuan LC,Zhang SJ,et al. The influence of combined gradient structure with residual stress on crack-growth behavior in medium carbon steel[J]. ENGINEERING FRACTURE MECHANICS,2019,209:369-381.
APA 王瑶.,Yuan LC.,张诗嘉.,孙成奇.,Wang WJ.,...&魏宇杰.(2019).The influence of combined gradient structure with residual stress on crack-growth behavior in medium carbon steel.ENGINEERING FRACTURE MECHANICS,209,369-381.
MLA 王瑶,et al."The influence of combined gradient structure with residual stress on crack-growth behavior in medium carbon steel".ENGINEERING FRACTURE MECHANICS 209(2019):369-381.
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