Evaluation of failure in CFRP embedded with shape memory alloy wires using fracture mechanics approach

Abstract

The purpose of the study is to understand the behaviour of carbon fibre reinforced with Shape Memory Alloys (SMA). Specimens were prepared using Carbon Fibre reinforced epoxy (CF) and Carbon Fibre reinforced epoxy with Shape Memory Alloys (CFSMA). Flexural and impact tests were done to investigate the flexural modulus, Young’s modulus, impact strength, energy absorbed in the CF and CFSMA specimens and significant improvement is observed with the incorporation of SMA. Fracture toughness of the specimens was measured through Mode – I, Mode – II, Mixed Mode loading cases. The fracture strength and Strain Energy Release Rate (SERR) was measured in both CF and CFSMA specimens under the proposed loading and the results were found to be promising and satisfactory. The fracture toughness and fracture strength values show significant improved in CFSMA, say it has improved by 39.53% and 35.03% for the Mode – I loading and similar improvement is observed in the other loading conditions.