Shear properties of acrylic under high strain rate loading

Abstract

Acrylic is being used in structural applications because of its higher resistance to projectile impacts. High strain rate shear loading is one of the critical conditions. In the present study, properties of typical acrylic under high strain rate shear loading are presented. Torsional Split Hopkinson Bar apparatus was used for the studies in the shear strain rate range of 290 per sec to 791 per sec. Thin-walled tubular specimens with hexagonal flanges were used for the experimental studies. Details of specimen configuration, data acquisition, and processing are presented. Shear strength is presented as a function of shear strain rate. It is observed that the shear strength at high strain rate is enhanced up to 25% compared with that at quasi-static loading in the range of parameters considered. Comparison of torque versus time behavior derived from signals obtained from strain gauges mounted on incident bar and transmitter bar is also presented.

Measuring the Effect of Strain Rate on Deformation and Damage in Fibre-Reinforced Composites: A Review

“…Torsion SHPB experiments have occasionally been employed to study composites. Comparison with an SHPB torsion study of acrylic [152] again suggested that the interlaminar shear response of composites depends mainly on the properties of the polymer matrix. Under torsion loading, little rate dependence for the flow shear strength has been reported [153], as have higher shear strengths at high strain rates [154,155].…”

“…Therefore many smaller cracks and delaminations occur prior to failure [46,[59][60][61]. The interlaminar shear properties of composites (the most common failure modes) mainly depend on the properties of the polymer matrix [152], so the damage mechanisms observed are likely to be governed by the high strain rate properties of the polymer matrix which are strain rate sensitive [2].…”