20 March 2014 Interfacial stresses in shape memory alloy-reinforced composites
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Abstract
Debonding of Shape Memory Alloy (SMA) wires in SMA reinforced polymer matrix composites is a complex phenomenon compared to other fabric fiber debonding in similar matrix composites. This paper focuses on experimental study and analytical correlation of stress required for debonding of thermal SMA actuator wire reinforced composites. Fiber pull-out tests are carried out on thermal SMA actuator at parent state to understand the effect of stress induced detwinned martensites. An ASTM standard is followed as benchmark method for fiber pull-out test. Debonding stress is derived with the help of non-local shear-lag theory applied to elasto-plastic interface. Furthermore, experimental investigations are carried out to study the effect of Laser shot peening on SMA surface to improve the interfacial strength. Variation in debonding stress due to length of SMA wire reinforced in epoxy are investigated for non-peened and peened SMA wires. Experimental results of interfacial strength variation due to various L/d ratio for non-peened and peened SMA actuator wires in epoxy matrix are discussed.
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S. R. Hiremath, Maulik Prajapati, S. Rakesh, D. Roy Mahapatra, "Interfacial stresses in shape memory alloy-reinforced composites", Proc. SPIE 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014, 905806 (20 March 2014); doi: 10.1117/12.2047331; https://doi.org/10.1117/12.2047331
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