The Dynamic Energy Release Rate for Two Parallel Steadily Propagating Mode III Cracks in a Viscoelastic Body
TEXAS A AND M UNIV COLLEGE STATION MECHANICS AND MATERIALS CENTER
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The dynamic steady state propagation of two parallel semi-infinite, mode III cracks is considered for a general, infinite, homogeneous, isotropic linearly viscoelastic body. A Barenblatt type failure zone is introduced in order to cancel the singular stress and a formula for the energy release rate is derived which provides immediate comparisons with the corresponding single crack problem. The influence of crack speed, crack separation, and material properties upon the energy release rate are illustrated with numerical calculations for both power-law material and a standard linear solid. Keywords viscoelasticity dynamic fracture dynamic energy release rate Barenblatt zone crack growth.