Abstract
To join the head and tail ends of two steel bars together, a solid-state joining technology named “shear joining” has been developed. In the process, no external heating is required since the bar temperature is around 1000 °C and sufficiently high for joining. Compared with the laser welding and fusion welding, the head and tail ends are joined together within a short time by pressing and shearing. So the process is very easy, quick and reliable without special heating and forming processes. As an innovative process, there is no appropriate method to evaluate the strength of joint up to now. In this research, a modified Lemaitre model was put forward to predict the strength of joint. This model could be also used to improve the design of joining tools and process conditions. Through comparison of load-displacement curves of tensile test obtained from FE simulation and experiment, the reliability of numerical model was verified. Compared with experimental results, the predicted joint strength showed a good quantitative agreement.
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