GH536带孔平板试样蠕变分析  

Creep Study on Notched Plate Specimens of GH536

作　　者：黎方娟 古远兴[1] 

机构地区：[1]中国燃气涡轮研究院,四川成都610500

出　　处：《燃气涡轮试验与研究》2014年第1期23-27,共5页Gas Turbine Experiment and Research

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.

关 键 词：GH536 局部应力集中 带孔平板试样 蠕变响应 火焰筒 数值模拟 

分 类 号：V250.3[一般工业技术—材料科学与工程] V231.95[航空宇航科学与技术—航空宇航制造工程]