文献类型：期刊文献

中文题名：基于多尺度建模方法的蠕变-疲劳寿命预测

英文题名：Creep-fatigue life prediction based on multi-scale modelling approach

作者：李凯尚[1];王润梓[1];张显程[1];涂善东[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237

年份：2021

卷号：38

期号：11

起止页码：73

中文期刊名：压力容器

外文期刊名：Pressure Vessel Technology

收录：CSTPCD;;北大核心:【北大核心2020】；

基金：国家自然科学基金项目(52005185,51725503);上海市教育委员会科研创新计划项目(201901070002E00068)。

语种：中文

中文关键词：蠕变-疲劳;跨尺度建模;晶体塑性;寿命预测;航空涡轮盘

外文关键词：creep-fatigue;multi-scale modelling;crystal plasticity;life prediction;aero-turbine disc

摘要：航空发动机、燃气机、发电机等装置在服役过程中承受着严重的蠕变-疲劳交互作用,这对部件的寿命设计提出了新的要求。基于跨尺度建模方法,实现了非连续结构的蠕变-疲劳损伤评估和寿命预测。在宏观尺度上,结合非统一循环本构方程和蠕变-疲劳损伤模型,确定非连续结构在蠕变-疲劳过程中的危险位置;在微观尺度上,借助晶体塑性理论,描述该危险位置处的微观力学行为和损伤演化规律。为验证提出的多尺度建模方法的可行性,对含孔结构进行一系列蠕变-疲劳试验,结果发现预测的裂纹萌生寿命与试验结果一致。最后,将这种多尺度建模方法运用到某型涡轮盘的损伤评定。
Aero-engines,gas engines and generators experience severe creep-fatigue interaction during the service period,which raises a new requirement for life design of such components.The creep-fatigue damage assessment and life prediction of discontinuous structures were realized by using the multi-scale modelling approach.At the macro-scale framework,the critical positions of discontinuous structures were determined in combination with the non-unified constitutive and corresponding creep-fatigue damage models.At the micro-scale framework,the micro-mechanical behavior and damage evolution at the critical positions were described using the crystal plasticity theory.In order to verify the feasibility of the multi-scale modelling approach,a series of creep-fatigue experiments were carried out for the holed structures.The results show that the predicted crack initiation life is consistent with the experimental results.Finally,the multi-scale modelling method was applied to damage evaluation of a type of aero-turbine disc.