Compression after ballistic impact response of pseudoelastic shape memory alloy embedded hybrid unsymmetrical patch repaired glass-fiber reinforced polymer composites

Abstract

This paper investigated the influence of embedding pseudoelastic shape memory alloy within the external bonded patch made up of glass fibers on the compression after impact response of adhesively bonded external patch repaired glass/epoxy composite laminates. Unsymmetrical patch repair was employed in the current studies. Three innovative pseudoelastic shape memory alloy configurations (straight wired, meshed and anchored) were embedded inside the patch and the changes in high-velocity impact response and damage tolerance at four impact velocities (70, 85, 95, 105 m/s) were compared with the conventional glass/epoxy (glass fiber-reinforced polymer) patch. Anchored specimens showed the best response by improving the compressive strength by 25% under non-impacted conditions and restoring it by 88%, 77%, 29%, and 28% at the impact velocity of 70, 85, 95, and 105 m/s, respectively, in comparison to the conventional normal specimens.

Compression after high-velocity impact behavior of pseudo-elastic shape memory alloy embedded glass/epoxy composite laminates

“…Damage progression on the back face is shown using a high-speed camera, with Figure 5 (a), is the first image, which captures the frame when the projectile is about to hit the sample. As shown in Figure 5 and Figure 6, due to PE-SMA embedment, delamination progresses predominantly along with the SMA wire, which is generally not the case for homogeneous GFRP [41]. When a projectile impacts the composite and comes in contact with PE-SMA wire, it starts undergoing deformation, and the region away from the primary impact region encounters strain due to this deformation.…”

Damage analysis of combined continuous and discontinuous thin‐ply carbon/glass hybrid composite using acoustic emission

“…Most early studies have used thin ply carbon with standard ply glass to introduce pseudoductility in composites, [1,2] while others used metals with fiber reinforced polymers to get a similar property. [3,4] Pseudo-ductility is a mechanical property introduced in brittle materials by creating non-linearity on their stressstrain responses under tensile loading. Hybrid laminate designs with continuous fibers like continuous thin unidirectional carbon with E-glass/S-glass composites have been found to produce this property.…”

An experimental study on low velocity impact behavior of thermoplastic composites repaired by composite patches

“…8,9 Among of these, external composite patch is one the most common type of repair techniques since it provides low cost, relatively basic operation process, short repair time and enhanced mechanical properties. 10,11 On the other hand, it should be noted that thickness of the repaired specimen in this repair method must be controlled and assured with the thickness of the unrepaired specimen since thickness of the specimen highly affects the mechanical properties and low velocity impact behavior, as well.…”