A novel methodology for large strain under intermediate strain rate loading

• DOI: 10.1016/j.polymertesting.2021.107142
• Publication Date: 2021-02-27T11:11:08Z
• Authors: H. He; Q. Deng; C.X. Wang; J. Li; K.X. Weng; Y.G. Miao
• Keywords: Bar (unit); Split Hopkinson Pressure Bar; Strain (injury); Stress wave

Hopkinson bar has already worked to measure mechanical properties of materials under high strain rates, but it fails conduct intermediate rates loading with considerable deformation. Thereby, a methodology is proposed for achieving enough large strains rates. The experimental system based on then constructed: striker same length as incident selected generate continuous stress wave loading, and long polymethylmethacrylate preferred the transmitted guide record signals. Thus, achievable nearly constant amplitude an infinite duration. involved data interpretations are deduced, verified both theoretically experimentally. Its measurement capacity confirmed by thermoplastic polyurethane, maximum up 12% 65% 40/s 270/s, respectively. Finally, influences factor sensitivities analyzed accuracy extensive measurements.