By S. Kumar, K. L. Mittal
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Also, it can be seen that the elastic case fails at a lower qx than the viscoelastic case. This is because as the relaxation modulus of viscoelastic adhesive decreases with time, elastic adhesive with Young’s modulus equals to E(0) will experience higher stress level in local stress concentration area and fail ﬁrst. Therefore, the bonded joint system with elastic adhesive will not be able to carry more loads earlier and reach a smaller peak value of qx than viscoelastic adhesive. Here we can conclude that when the relaxation modulus of viscoelastic adhesive has terms with bigger values of gi and ti (in other words, E(t) will eventually have a lower value and take longer time to relax), the joint stiffness of the system will be more enhanced.
11 plot normalized Nxy in terms of Nx deﬁning the elastic limit envelopes. 10 Yield envelopes for glass/epoxy adherends. 11 Yield envelopes for carbon/epoxy adherends. 07 Stress and Strain Analysis 21 and Nxy loading. 10). The 2s lay-up will make the strongest joint if loaded by in-plane shear Nxy only. Meanwhile, the 2s lay-up will be the strongest joint when loaded by in-plane tension load Nx. If the joint is loaded by the combined loading, [45/0]s or [0/45]s can be a better choice than 2s and 2s.
References 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 R. D. Adams and N. A. Peppiatt, J. Strain Analysis Eng. Design 9, 185 (1974). I. U. L. Eidinoff, AIAA J. 16, 204 (1978). M. Goland and E. Reissner, J. Appl. Mech 11, A17 (1944). F. Delale, F. Erdogan and M. N. Aydinoglu, J. Composite Mater. 15, 249 (1981). B. -H. Lu, Mech. Adv. Mater. Struct. 16, 130 (2009). B. -H. -N. Lu, Intl. J. Adhesion Adhesives 31, 434 (2011). J. N. Reddy and S. Roy, Intl. J. Non-Linear Mech. 23, 97 (1988).