【摘要】 利用MTS高级材料实验机在应变控制条件下获得了镁合金AM50的单向拉伸应力应变曲线和常规的机械性能参数;用紧凑拉伸试件测定了镁合金AM50的应力强度因子.基于虚拟裂纹闭合法和Griffith势能法,得到相应载荷下的能量释放率G和应力强度因子K,并将计算结果与实验值进行了比较,获得了与实验一致的结果,表明该方法可用于镁合金构件断裂力学参量的数值分析和计算.更多还原

【Abstract】 The strain-stress curve and the stress intensity factor are carried out using the machine MTS for Magnesium alloy AM50.Energy release rates(G)are evaluated based on the virtual crack closure technique and Griffith potential energy.Based on the relationship between Energy release rate(G)and stress intensity factor(K).And then stress intensity factor(K) is got.Comparison of stress intensity factors(K) of between the calculated values and experimental values is made,showing that they are in good agreement.更多还原