mixed tractions t_n (in tension only), t_s and t_t.įor pure mode (for example Mode I only), damage initiates when t_n / t_n-0 = 1. ![]() ![]() The question is when the damage initiates at the bond (cohesive element) and how it evolutes after initiation under mixed mode condition, i.e. This is shown on one cohesive element in Figure 1. Note that although mode III is not a predominant contributory factor but is often included in the mixed mode scenario assuming that GcII = GcIII, conservatively. Depending on the complexity of loading on the adhesive bond, you may have peel stresses (crack opening), in-plane shear stress (crack sliding), or out-of-plane shear stress/traction (crack tearing).Īs in the majority of cases, bonded joints are subjected to mixed-mode (I + II) loading where both peel and shear stresses exist. It was also mentioned that the energy required to open crack in mode I was less than that of mode II and III, i.e. mode I (opening), mode II (sliding) and mode III (tearing). ![]() Finite Element Analysis (FEA) of Bonded Joints (BJ)-Part VI:Īs it was explained in parts I-V, cracks open in three modes, i.e.
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