Studies on shape memory alloy-embedded GFRP composites for improved post-impact damage strength

ABSTRACT

Embedding shape memory alloys (SMAs) in composites is a promising method resistance against impact loading.In the present paper, an attempt is made to quantify the improvement in damage mitigation properties of FRP (fibre reinforced plastic)composites by embedding SMA.Numerical modelling of low velocity impact was carried out topredict the delamination in composites and composites embedded with SMA and steel wires. Through modelling, effect of location and quantity of SMA material in decreasing the impact induced delamination size was also studied.Compression after impact (CAI) tests were carried out on pristine and SMA hybrid composite (SMAHC)specimens to quantify the change in damage resistance. Experimental results show an improvement in compressive load-carrying capacity after impact in SMAHC as compared to pristine composites.Experimental results match well with numerical findings in terms of; location of placement of SMA wire and optimum quantity of SMA wires.

KEYWORDS:

• Composites
• shape memory alloy
• delamination
• low-velocity impact
• numerical modelling
• compression after impact

Acknowledgments

The authors wish to acknowledge the support and contribution made by members of Composite Research Center, R&DE(E), Pune, more specifically Vinod Duraiswamy and his team for fabrication of RFI samples. The authors also acknowledge the support and facility provided by members of DMRL, DRDO, Hyderabad for carrying out drop weight impact testing.

Disclosure statement

No potential conflict of interest was reported by the authors.