The post-yield plastic flow of mild steel is affected by strain rate. Thus, for numerical modeling purposes, it will be helpful if the true stress-true strain relationship of the material up to fracture is known for different strain rates. A procedure that allows the strain rate dependent true stress-true strain curve up to fracture to be determined from the tension test has been developed. Tension specimens of mild steel were tested at a constant strain rate ranging from 10 -5 s -1 to 10 0 s -1. Non-standard round specimens with a tapered profile were used to permit the diameter at the minimum cross-section to be measured continuously during the test. Due to necking of the tension coupon, an equation has been established to correct for the effect of the non-uniaxial hydrostatic stress on the measured stress. This stress correction allows the true stress-true plastic strain curve of the material at various strain rates to be determined directly from the measured load and cross-section dimension. The procedure and correction equation are validated against the test results through numerical simulations.

Additional Metadata
Conference Annual Conference of the Canadian Society for Civil Engineering 2011, CSCE 2011
Citation
Walker, A. (Adam), Chen, J. (Jianwei), & Khoo, H. A. (2011). Determination of strain rate dependent stress-strain curve up to fracture for mild steel. Presented at the Annual Conference of the Canadian Society for Civil Engineering 2011, CSCE 2011.