Analysis of stress intensity factor at the crack tip based on thermal-mechanical coupling
ZHAO Zhongqiang
CAO Tianye
WANG Hui
LIU Jingyi
Abstract：[Objective]To clarify the failure mechanism and influencing factors of contact fatigue,improve the fatigue resistance of mechanical parts,and extend the fatigue life,research on the initiation and propagation mechanism of surface cracks under contact fatigue was carried out.[Methods]The influencing factors of the stress intensity factor at the crack tip under sliding contact thermo-mechanical coupling were analyzed by the finite element method and fracture mechanics theory.The variation rules of the stress intensity factor under different pressure loads,friction coefficients,crack lengths,crack angles,and sliding velocities were obtained.[Results]The results show that the crack belongs to the Ⅰ-Ⅱ compound crack.The mode of crack changes from Ⅰ to Ⅱ as the sliding block approaches the crack.The thermal effect can suppress Ⅰ and Ⅱexpansion,and the more significant the thermal effect is,the stronger the inhibition is.However,KⅠ is more sensitive to the thermal effect than KⅡ.The compound crack propagation intensifies with the increase of pressure load and crack angle.The mode Ⅰ extension intensifies while mode Ⅱ decreases when the friction coefficient increases.The mode Ⅰ extension decreases,and the mode Ⅱ extension increases when the crack length increases.Both mode Ⅰ and Ⅱ extensions become weak with the increase of sliding speed.
Keywords：Solid mechanicsSliding contactThermo-mechanical couplingCrackStress intensity factorFinite element method
Publication Date：2026-01-31
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 109-115 )