基于统一力学理论的Ti-6Al-4V合金低周疲劳寿命预测

Low Cycle Fatigue Life Prediction Using Unified Mechanics Theory in Ti-6Al-4V Alloys.

作者信息

Bin Jamal M Noushad, Kumar Aman, Lakshmana Rao Chebolu, Basaran Cemal

机构信息

Department of Applied Mechanics, Indian Institute of Technology, Madras 600036, India.

Civil, Structural and Environmental Engineering, University at Buffalo, State University of New York, New York, NY 10031, USA.

出版信息

Entropy (Basel). 2019 Dec 23;22(1):24. doi: 10.3390/e22010024.

DOI:10.3390/e22010024

PMID:33285799

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7516445/

Abstract

Fatigue in any material is a result of continuous irreversible degradation process. Traditionally, fatigue life is predicted by extrapolating experimentally curve fitted empirical models. In the current study, unified mechanics theory is used to predict life of Ti-6Al-4V under monotonic tensile, compressive and cyclic load conditions. The unified mechanics theory is used to derive a constitutive model for fatigue life prediction using a three-dimensional computational model. The proposed analytical and computational models have been used to predict the low cycle fatigue life of Ti-6Al-4V alloys. It is shown that the unified mechanics theory can be used to predict fatigue life of Ti-6Al-4V alloys by using simple predictive models that are based on fundamental equation of the material, which is based on thermodynamics associated with degradation of materials.

摘要

任何材料中的疲劳都是连续不可逆降解过程的结果。传统上，疲劳寿命是通过外推实验曲线拟合的经验模型来预测的。在当前研究中，统一力学理论被用于预测Ti-6Al-4V在单调拉伸、压缩和循环载荷条件下的寿命。统一力学理论被用于使用三维计算模型推导用于疲劳寿命预测的本构模型。所提出的分析和计算模型已被用于预测Ti-6Al-4V合金的低周疲劳寿命。结果表明，统一力学理论可通过基于材料基本方程的简单预测模型来预测Ti-6Al-4V合金的疲劳寿命，该基本方程基于与材料降解相关的热力学。