Abstract
Strength and ductility data at high strain rates (~1,200 s−1) for UTS800, UTS700 automotive steel and their electron beam welded (EBW) were obtained using a split Hopkinson tensile bar apparatus. The stress–strain curves of the materials were obtained, tensile strength, elongation, reduction in area, and energy dissipated were acquired. From the experimental results, based UTS800 shows higher flow stress but lower fracture elongation than based UTS700. When comparing welded materials to the corresponding based materials, the flow stress presents little different but the fracture elongation displays distinct decreased. Digital image correlation was used together with high-speed photography to study the strain localisation in the tensile specimens. By using digital image correlation, the in-plane strain field and local fracture strain of the specimen were obtained.
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