High Strain Rate Compressive Tests on Woven Graphite Epoxy Composites

Abstract

The behavior of composite materials may be different when they are subjected to high strain rate load. Penetrating split Hopkinson pressure bar (P-SHPB) is a method to impose high strain rate on specimen in the laboratory experiments. This research work studied the response of the thin circular shape specimens, made out of woven graphite epoxy composites, to high strain rate impact load. The stress-strain relationships and behavior of the specimens were investigated during the compressive dynamic tests for strain rates as high as 3200 s −1 . One dimensional analysis was deployed for analytical calculations since the experiments fulfilled the ratio of diameter to length of bars condition in impact load experiments. The mechanics of dynamic failure was studied and the results showed the factors which govern the failure mode in high strain deformation via absorbed energy by the specimen. In this paper, the relation of particle velocity with perforation depth was discussed for woven graphite epoxy specimens.

Compression of the Material Characteristics of Steel, Aluminum, Wood and Woven Graphite Epoxy Composites in Response to High Strain Rate Load

“…Previous laboratory works proved that depending on the nature of the penetrator head, conical hemispherical penetrator was found to be more effective in penetrating or perforating the composite plate than spherical penetrator [27] . The authors [28][29][30] have analyzed the high-energy penetration/perforation mechanics of steel, aluminum, wood and the woven graphite epoxy composites individually and confirmed that for all of these materials, strain rate, ultimate strain, and energy absorption increase with increasing perforation energy.…”

“…Integrating this wave provides the energy absorbed-time history, force-displacement, stress-strain, and other relevant data with which the specimen damage can be characterized. For interested readers the detail of the experimental set up can be found in other published papers of the authors [27][28][29][30][31] . The specimen is placed in a penetrator holder, which is mounted at the end of the incident bar.…”

Experimental investigation of quasi-static and intermediate strain rate behaviour of polypropylene glass fibre (PPGF) woven composite

“…Rectangular shaped flat specimens, measuring 20062563 mm 3 , were used for quasi-static tensile tests ( Fig. 2a).…”

High Strain Rate Compressive Tests on Wood

“…Integrating this wave provides the energy absorbed–time history, force–displacement, stress–strain and other relevant data with which the specimen damage can be characterised. For interested readers, the detail of the experimental set‐up can be found in other published papers of the authors [9]. Some of the results were discarded as a result of different factors such as no clear wave, no response on the oscilloscope and pressure drop before triggering the system and some other uncertainties.…”