GH536带孔平板试样蠕变分析

摘要

采用有限元方法对GH536带孔平板试样的蠕变响应进行了数值模拟，以圆孔半径为尺寸参数，研究了不同圆孔半径试样的蠕变应力、蠕变应变分布及其随时间的变化。计算结果表明：圆孔半径对应力分布影响显著，圆孔半径越小，最大等效应力越大，最大等效应力随时间的松弛越明显，蠕变引起的应力重新分布越明显；对含局部应力集中部位结构进行持久强度储备和寿命分析时，必须考虑局部应力分布特性的影响。%By adopting Norton model during FEM analysis, the creep response of plate specimens with vari-ous hole radius was simulated. Consequently, the stress and strain distribution and their histories were in-vestigated. The results show that radius of the hole holds strong influence on stress distribution. While radi-us of the hole is decreasing, the maximum equivalent stress is increasing, the creep relaxation is more obvi-ous, the stress distribution changes are more notable;local stress distribution and histories should be taken into account when the durability margin of safety and life of components with local stress concentration parts are assessed.