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A new approach to low cycle tension-torsion multiaxial fatigue.

机译:低周张力-扭转多轴疲劳的一种新方法。

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摘要

The objective of this research is to examine the low cycle tension-torsion multiaxial fatigue behavior in the perspective of engineering and science. This paper is made up of three parts, which adopted different approaches to tackle the low cycle tension-torsion multiaxial fatigue.; In Part 1 of this paper, some of the important aspects of the low cycle tension-torsion multiaxial fatigue were summarized. Based on the present knowledge, fundamentals on the low cycle tension-torsion multiaxial fatigue were established.; In Part 2 of this paper, a life prediction model was developed using a cyclic equivalent strain approach for predicting the low cycle tension-torsion multiaxial fatigue lives based on the uniaxial fatigue data. The cyclic equivalent strain approach enabled us to combine the uniaxial, torsional fatigue and tension-torsion multiaxial fatigue data into a single life equation. The above model was applied successfully to experimental data available in Waspaloy (two heat treatments) and 1045 steel.; In Part 3 of this paper, elaborately designed experiments were conducted to investigate the low cycle torsional and tension-torsion multiaxial fatigue behaviors of 1045 steel. The emphases were placed upon the elucidation of cyclic hardening behavior, the examination of the generic nature of slip and crack growth behaviors and the establishment of dislocation mechanism associated with the low cycle tension-torsion multiaxial fatigue.
机译:这项研究的目的是从工程和科学的角度研究低周张力-扭转多轴疲劳行为。本文由三个部分组成,它们采用了不同的方法来解决低周张力-扭转多轴疲劳问题。在本文的第1部分中,总结了低周张力-扭转多轴疲劳的一些重要方面。基于目前的知识,建立了低周张力-扭转多轴疲劳的基础。在本文的第2部分中,使用循环等效应变方法开发了寿命预测模型,该模型用于根据单轴疲劳数据预测低循环张力-扭转多轴疲劳寿命。循环等效应变方法使我们能够将单轴,扭转疲劳和拉伸扭转多轴疲劳数据组合为一个寿命方程。上述模型已成功地应用于Waspaloy(两次热处理)和1045钢中的实验数据。在本文的第3部分中,进行了精心设计的实验,以研究1045钢的低循环扭转和拉伸扭转多轴疲劳行为。重点放在阐明循环硬化行为,检查滑移和裂纹扩展行为的一般性质以及建立与低周向拉伸-扭转多轴疲劳相关的位错机制方面。

著录项

  • 作者

    Sonu, Jun.;

  • 作者单位

    University of Cincinnati.;

  • 授予单位 University of Cincinnati.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 178 p.
  • 总页数 178
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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