Abstract
This paper details an investigation of the high strain rate compression testing of GFPP with the Split Hopkinson Pressure Bar (SHPB) in the through-thickness and in-plane directions. GFPP posed challenges to SHPB testing as it fails at relatively high stresses, while having relatively low moduli and hence mechanical impedance. The modifications to specimen geometry and incident pulse shaping in order to gather valid test results, where specimen equilibrium was achieved for SHPB tests on GFPP are presented. In addition to conventional SHPB tests to failure, SHPB experiments were designed to achieve specimen equilibration at small strains, which permitted the capture of high strain rate elastic modulus data. The strain rate dependency of GFPP’s failure strengths in the in-plane and through-thickness direction is modelled using a logarithmic law.
Highlights
Glass fibre reinforced polypropylene (GFPP) is a thermoplastic composite used in diverse applications such as car bumpers [1], boat hulls and wind turbine blades [2]
This study presents data from compression Split Hopkinson Pressure Bar (SHPB) testing of GFPP
An important criteria for valid SHPB testing is that the stresses at the input and output faces of the specimen achieve quasi-equilibrium
Summary
Glass fibre reinforced polypropylene (GFPP) is a thermoplastic composite used in diverse applications such as car bumpers [1], boat hulls and wind turbine blades [2]. The published strain rate dependent data on GFPP was investigated in detail by Govender [4]. All specimens were cut from the panels using abrasive water jet cutting, and were polished using 220 and 500 grit S iC polishing paper For both quasi-static and SHPB tests, the specimen faces in contact with the loading platens or bars were lubricated with molybdenum grease. Cubic specimens of nominal width and breadth 20 mm were cut from the 20 mm thick panel, for determining the through-thickness modulus. These specimens were instrumented with 120Ω, 2 mm gauge length strain gauges
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