Interaction between dislocation and subsurface crack under condition of slip caused by half-plane contact surface normal force

• Slip occurrence depends on combined effect of surface force and dislocation.
• Surface force promotes slip occurrence, whereas dislocation inhibits it.
• Crack propagation is evaluated by combined effect of surface force and dislocation.
• Dislocation inhibits crack propagation, whereas surface force promotes it.
• Frictional coefficient promotes slip occurrence and inhibits crack propagation.

Interaction between dislocation and subsurface crack under condition of slip caused by surface normal force is investigated. Utilizing distributed dislocation technique, numerical solutions for critical location where crack slip occurs and stress intensity factors at crack tips are obtained. Various parameters related to material, surface force and dislocation are defined to further analyze the problem. Results show that both slip occurrence and crack propagation depend on combined effect of surface force and dislocation. Surface force promotes both slip occurrence and crack propagation, whereas dislocation inhibits both of them. Additionally, frictional coefficient promotes slip occurrence but inhibits crack propagation.