Forming limit diagram is one of the most applicable methods for prediction of plastic instability in sheet metal forming that temperature and strain rate is among factors effecting on the FLD. In this paper, the effects of temperature and strain rate at quasi-static condition on the true stress-true strain curve and forming limit curve of AA3104 aluminum are analytically investigated using Marciniak-Kuckzynski method and Johnson-cook model. The stress-strain response of numerical results validation using the Ludwik model is performed with experimental results. Theoretical results show a good agreement with experimental results. Then, according to the stress-strain curves obtained based on the Ludwik equation, Johnson-Cook coefficients are calculated for AA3104 and the true stress-true strain respond and forming limit diagram are produced for different temperatures 50°C، 300°C and 400°C and several t strain rates 〖10〗^(-5)، 〖10〗^(-4)and 〖10〗^(-3) s^(-1). The stress-strain curve decreases with increasing temperature and increases with increasing strain rate. Also the FLD increases with increasing temperature and decreases with increasing strain rate. The results exhibit a positive sensitivity of temperature on the limit strain due to the thermal softening and the negative strain rate sensitivity on the FLD AA3104 due to the behavior of crystallographic structure of the material
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