一种基于新非比例因子的多轴低周疲劳寿命预测模型研究
Research on Multiaxial Low Cycle Fatigue Life Model Based on a New Non-proportional Factor
陈景杰 1董拉加 1黄一 1刘刚1
作者信息
- 1. 大连理工大学船舶工程学院,大连 116024
- 折叠
摘要
非比例附加强化效应对多轴低周疲劳寿命有着显著影响,其中加载路径引起的非比例度和材料自身的非比例特性是描述非比例附加强化效应的关键因素.论文结合相位角和应变比引起的非比例度提出了简单直观的新路径非比例度;引入了材料静态强化系数代替诸多临界平面模型中的非比例附加强化系数,避免了复杂的试验过程和数据拟合引入的误差,反映了无明显附加强化效应材料自身的非比例特性;综合路径和材料因素的影响提出了新的非比例因子,结合临界平面法建立多轴低周疲劳寿命预测模型,预测了 13种材料的多轴低周疲劳寿命.通过与试验数据比较表明,基于新非比例因子建立的多轴低周疲劳寿命预测模型具有较高的预测精度和材料适用性.
Abstract
The non-proportional additional hardening effect has a significant impact on the multiaxial low-cycle fatigue life,where the non-proportionality caused by the loading path and the non-proportional characteristics of the material itself are the key factors.This article considers the non-proportionality caused by the phase angle and strain ratio and proposes a simpler and more intuitive new path of nonproportionality.The static hardening parameter of the material is introduced to replace the non-proportional additional hardening coefficients,which not only avoids complex experimental processes and errors introduced by data fitting but also reflects the non-proportional characteristics of the material itself without obvious additional hardening.A new non-proportional factor was proposed by combining the influence of path factors and material factors.Then a multiaxial low-cycle fatigue life prediction model was established using the critical plane method,and the multiaxial low-cycle fatigue life of 13 materials(including 6 materials without obvious additional hardening)was predicted.By comparing with experimental data,it is shown that this prediction model has high accuracy and material applicability.
关键词
多轴低周疲劳/临界平面法/非比例附加强化效应/路径非比例度/静态强化系数/寿命预测Key words
multiaxial low cycle fatigue/critical plane method/non-proportional additional hardening effect/non-proportionality/static hardening parameter/life prediction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据