Abstract
Abstract Due to the properties of shape memory effect and super-elasticity, shape memory alloy (SMA) is added into glass fiber reinforced polymer (GFRP) face-sheets of foam core sandwich panels to improve the impact resistence performance by many researchers. This paper tries to discuss the failure mechanism of sandwich panels with GF/ epoxy face-sheets embedded with SMA wires and conventional 304 SS wire nets under low-velocity impact and compression after impact (CAI) tests. The histories of contact force, absorbed energy and deflection during the impact process are obtained by experiment. Besides, the failure modes of sandwich panels with different ply modes are compared by visual inspection and scanning electron microscopy (SEM). CAI tests are conducted with the help of digital image correlation (DIC) technology. Based on the results, the sandwich panels embedded with SMA wires can absorb more impact energy, and show relatively excellent CAI performance. This is because the SMA wires can absorb and transmit the energy to the outer region of GFRP face-sheet due to the super-elasticity-behavior. The failure process and mechanism of the CAI test is also discussed.
Highlights
Due to the properties of shape memory effect and super-elasticity, shape memory alloy (SMA) is added into glass fiber reinforced polymer (GFRP) facesheets of foam core sandwich panels to improve the impact resistence performance by many researchers
For incident energies of 14J, 18J and 22J, the maximum contact force of ply VI shows an improvement of 40.1%, 37.7% and 27%, relative to ply I, respectively
This study focuses on the low-velocity impact and compression-after-impact (CAI) performance of foam core sandwich panels incorporated with shape memory alloy (SMA) or 304 SS wires
Summary
Abstract: Due to the properties of shape memory effect and super-elasticity, shape memory alloy (SMA) is added into glass fiber reinforced polymer (GFRP) facesheets of foam core sandwich panels to improve the impact resistence performance by many researchers. This paper tries to discuss the failure mechanism of sandwich panels with GF/epoxy face-sheets embedded with SMA wires and conventional 304 SS wire nets under low-velocity impact and compression after impact (CAI) tests. The sandwich panels embedded with SMA wires can absorb more impact energy, and show relatively excellent CAI performance. There are two main kinds of methods to improve the impact resistence performance of composite face-sheet of sandwich, hybrid reinforced fiber and lay-up designs. Compared to fiber reinforced plastic, metal has an excellent low-velocity impact performance due to its high ductility. Low-velocity impact and CAI experiments are conducted to analyze the impact resistence performance of foam core sandwich panels with SMA hybrid GF/epoxy face-sheets which are designed with different orientations and numbers of SMA wires. The advantage of SMA enhanced sandwich panels in CAI tests are presented and some conclusions explained this results are drawn
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