摘要
The in-plane tensile behaviors of bi-axial warp-knitted(BWK) composites under quasi-static and high strain rates loading were experimentally analyzed in this article. The tensile tests were conducted along warp direction( 0°) and weft direction( 90°) at quasi-static rate of 0. 001 s^(-1) and high strain rates ranging from 1 450 to 2 540 s^(-1),respectively. It is found that the significant strain rate sensitivity can be observed in the stress-strain curves of BWK composites. The fracture morphologies of BWK composites demonstrate that the tensile failure modes are shear failure and fiber breakage under the quasi-static testing condition while interface failure and fibers pullout are at high strain rates.
The in-plane tensile behaviors of bi-axial warp-knitted（BWK） composites under quasi-static and high strain rates loading were experimentally analyzed in this article. The tensile tests were conducted along warp direction（ 0°） and weft direction（ 90°） at quasi-static rate of 0. 001 s^（-1） and high strain rates ranging from 1 450 to 2 540 s^（-1）,respectively. It is found that the significant strain rate sensitivity can be observed in the stress-strain curves of BWK composites. The fracture morphologies of BWK composites demonstrate that the tensile failure modes are shear failure and fiber breakage under the quasi-static testing condition while interface failure and fibers pullout are at high strain rates.
基金
National Natural Science Foundations of China(Nos.11272087,11572085)
Financial Supports from Foundation for the Fok Ying-Tong Education Foundation of China(No.141070)
the Fundamental Research Funds for the Central Universities of China(No.170310103)
