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基于7075高强铝合金试样,试验研究其不同阶梯温度载荷或不同应力载荷下表面残余应力随保温时间或应力循环周期的演变规律。结果表明,发生大幅应力松弛受到相应的临界温度或临界应力控制,且载荷一定时应力松弛与保温时间或循环周期呈线性对数关系。另外,残余应力松弛并不受外部载荷性质严格控制,说明应力松弛的本质机理应从材料微观内部解释。
Based on the 7075 high-strength aluminum alloy specimen, the evolution of residual stress at different step temperature or different stress loads with the holding time or stress cycle was studied. The results show that the occurrence of large stress relaxation is controlled by the corresponding critical temperature or critical stress, and the stress relaxation and the holding time or the cycle of the load is a linear logarithmic relationship. In addition, the residual stress relaxation is not strictly controlled by the nature of the external load, indicating that the intrinsic mechanism of stress relaxation should be interpreted internally from the microscopic material.