论文部分内容阅读
基于Lemaitre提出的耗散势,得到了一维对称循环应变疲劳损伤演变方程为:dD/dN=2/2n’h+1(K’~2/2EH)εpo~2nlh+1。继而进一步分析表明:满足M-C关系式的材料,其损伤演变规律可用本关系式描述。以及Miner提出的损伤线性累积定律也可用于应变疲劳损伤累积的近似估算。最后,讨论了损伤演变方程中材料常数的确定。并给出了16Mn钢的有关特性常数h=2.3393,H=1.2879和损伤演变方程dD/dN=6.85461.8202)。
Based on the dissipative potential proposed by Lemaitre, a one-dimensional symmetrical cyclic strain fatigue damage evolution equation is obtained: dD / dN = 2 / 2n’h + 1 (K ’~ 2 / 2EH) εpo ~ 2nlh + 1. Further analysis shows that: The material to meet the M-C relationship, the evolution of damage can be described by this relationship. And the linear cumulative damage law proposed by Miner can also be used to estimate the cumulative strain fatigue damage. Finally, the determination of material constants in the damage evolution equation is discussed. The relevant characteristic constants of 16Mn steel h = 2.3393, H = 1.2879 and damage evolution equation dD / dN = 6.85461.8202 are given.