【摘要】 分析FGH96涡轮盘的尺寸效应,分析了分别适合于FGH96亚尺寸盘和全尺寸盘的低循环疲劳寿命预测方法.成功设计了FGH96亚尺寸盘、全尺寸裂纹扩展盘试验件;通过低循环疲劳试验,展现了两种不同的低循环疲劳失效机理,验证了提出的低循环疲劳寿命预测方法;通过裂纹扩展试验,获得了FGH96全尺寸轮盘的裂纹扩展特性,揭示了FGH96全尺寸涡轮盘与紧凑拉伸试样裂纹扩展特性具有显著差别的客观规律;获得FGH96全尺寸涡轮盘580℃损伤容限值,明确某发动机高压涡轮盘损伤容限水平.更多还原

【Abstract】 Scale effects of FGH96 disc were analyzed.Different LCF(low cycle fatigue) life forecasting methods fitted for FGH96 sub-scale and full-scale disk were analyzed.FGH96 sub-scale disk and FGH96 full-scale crack propagation disk were successfully designed.Two kinds of LCF failure mechanism were showed by LCF life tests.LCF life forecasting methods were verified.FGH96 crack propagation disc’s crack propagation characteristic was gained by crack propagation tests.The objective laws for prominent difference of crack propagation characteristic between FGH96 disc and compact tensile sample were revealed.FGH96 crack propagation disc’s damage tolerance values of 580 ℃ were obtained.Understanding was made for the high pressure turbine disk’s damage tolerance level.更多还原