Creep damage constitutive model of titanium alloys under compression at room temperature

Yuhao GUO; Gang LIU; Yuze SONG

doi:10.11990/jheu.202111047

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Creep damage constitutive model of titanium alloys under compression at room temperature

更新时间：2025-09-01

- Creep damage constitutive model of titanium alloys under compression at room temperature
- Journal of Harbin Engineering University Vol. 45, Issue 4, Pages: 642-650(2024)
- 作者机构：
  
  1.大连理工大学船舶工程学院, 辽宁大连 116024
  2.大连理工大学工业装备结构分析优化与CAE软件全国重点实验室, 辽宁大连 116024
- 作者简介：
- 基金信息：
- DOI：10.11990/jheu.202111047
  CLC： O346.5
- Received：27 November 2021，
  
  Online First：27 February 2024，
  
  Published：05 April 2024
- 稿件说明：
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Yuhao GUO, Gang LIU, Yuze SONG. Creep damage constitutive model of titanium alloys under compression at room temperature[J]. Journal of Harbin Engineering University, 2024, 45(4): 642-650.
DOI：

Yuhao GUO, Gang LIU, Yuze SONG. Creep damage constitutive model of titanium alloys under compression at room temperature[J]. Journal of Harbin Engineering University, 2024, 45(4): 642-650. DOI： 10.11990/jheu.202111047.

摘要

为了解决工程上在评估深潜器耐压壳体安全可靠性时不考虑拉压蠕变破坏机理产生的差异

会导致较大计算误差问题

本文提出了适用于室温蠕变的蠕变损伤本构模型。通过分析钛合金材料蠕变特性

考虑了室温环境下位错堆积造成的蠕变阻力

并且位错堆积的现象与时间有关。基于微分自洽法提出了适用于室温环境下的钛合金蠕变本构模型

得到受压情况下TC4ELI的相关材料参数

并将该模型用USDFLD和CREEP子程序进行定义。研究表明: 对于受压结构而言

使用通过拉伸蠕变实验得到的本构模型的计算结果会过于保守

对于含V型缺口平板受压时等效蠕变应变的相对误差为168.20 %。本文所提出的模型适用于环肋耐压壳结构的蠕变损伤分析。

Abstract

In creep damage mechanisms

differences in compression and tension are often ignored when evaluating the safety and reliability of submersible pressure shells. This oversight may lead to large errors. The creep properties of titanium alloy materials are analyzed

and the creep resistance caused by dislocation accumulation at room temperature is considered. In addition

dislocation accumulation is time dependent. A creep constitutive model of titanium alloy applicable to a room temperature environment is proposed on the basis of the differential self-adjoint method. Thereby

the material parameters of titanium alloy under compression conditions are obtained

and the model is defined using USDFLD and CREEP subroutine. The results show that for the compression structure

using the constitutive model obtained through the tensile creep experiment leads to a conservative outcome. The relative error of the equivalent creep strain is 168.20 % for a plate with V-notch. The proposed model is applicable to the creep damage analysis of ring-ribbed pressure shell structures.

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references

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