Plastic Constitutive Relation for Improving the Calculation Accuracy of Mechanical Performance of Die-Cast Al-Si Aluminium Alloy Products

With the interaction in automobile manufacturing technology, products made of integrated die-cast aluminum alloy are becoming more and more widespread. However, engineers frequently ignore the impact of structural features on mechanical properties when utilizing simulation software to determine a product's strength, and current constitutive models do not account for structural flaw studies. To examine the correlation between structural flaws and mechanical properties of the die-cast aluminum alloy, quasi-static tensile tests were performed on JDA1b alloy specimens. The defect rates were varied by adding circular holes with varying diameters at the center of the specimens. The results showed that the JDA1b alloy’s tensile strength and elongation significantly decreased as the fault rate increased. A constitutive model with defect rates is proposed, which has higher accuracy than the J–C model. Simulations and experimental findings effectively validated the accuracy of the proposed constitutive model. The proposed model provides support for high-precision computing for analyzing the mechanical performance of materials.