EFFECT OF CRACK FACE CONTACT AND FRICTION ON DYNAMIC STRESS INTENSITY FACTORS FOR A DOUBLE-EDGE CRACKED PLATE
The finite element method is used to solve the problem of dynamic frictional contact between the crack surfaces for a double-edge cracked plate subjected to compressive impact loading.The square-root stress singularity around the crack tip is simulated by quarter point singular elements.The dynamic stress intensity factors are evaluated by the displacement correlation technique.The effect of the crack face contact and friction on the dynamic stress intensity factors is investigated.The numerical results indicate that if the contact interaction between the crack surfaces is ignored, the negative dynamic stress intensity factors for mode I may be obtained and a physically impossible interpenetration or overlap of the crack surfaces will occur.It is also observed that with increasing friction the tangential relative displacements at the crack edges and dynamic stress intensity factors for mode II decrease.