间歇疲劳试验对盐岩疲劳特性的影响

姜德义; 范金洋; 陈结; 杨春和; 崔遥

doi:10.11779/CJGE201607003

间歇疲劳试验对盐岩疲劳特性的影响 English Version

姜德义¹,
范金洋^1,,
陈结^{1, 2},
杨春和^{1, 2},
崔遥¹

1. 煤矿灾害动力学与控制国家重点实验室(重庆大学), 重庆 400044；
2. 中科院武汉岩土力学研究所,武汉湖北 430071;

基金项目: 高等学校博士学科点专项科研基金项目（20130191130003）；重庆市研究生科研创新项目；国家自然科学基金青年基金项目（51304256）

详细信息

作者简介:
姜德义(1962- ),男,教授,博士生导师,主要从事岩土力学、采矿工程、安全工程方面的研究。E-mail: deyij@cqu.edu.cn。

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出版历程
- 收稿日期: 2015-07-01
- 发布日期: 2016-07-24

Influence of interval fatigue tests on fatigue characteristics of salt rock

1. State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, Chongqing 400044, China;
2. Institute of Rock and Soil Mechanics, The Chinese Academy of Sciences, Wuhan 430071, China

摘要

摘要: 通过间歇疲劳试验和传统疲劳试验的对比,研究了无应力间歇时间对盐岩疲劳特性的影响。经过间歇疲劳试验的盐岩试样与传统疲劳试样差异巨大。表现出的不同点主要有：①在相同的应力加载条件下,盐岩的间歇疲劳寿命与传统疲劳寿命相比缩短了50%以上;②间歇疲劳试验中间歇后的每个循环不可逆变形更大,不可逆变形的累计速率更快;且随着间歇时间的增加,变形越大,累计速率越快;③卸载弹性模量总体上逐渐增大,间歇疲劳试验中,卸载弹性模量随间歇时间的变长而增大。间歇疲劳的机理是：在盐岩内部缺陷发育生长时,缺陷周围由于屈服的时空顺序差异引起了应力应变的不协调响应,导致了残余应力;在残余应力作用下,晶粒内部产生的位错做反向运动,且间歇时间越长,反向运动距离越大;再次加载时,由于包申格效应,导致位错滑移引发的塑性变形更大。
- 盐岩 /
- 疲劳寿命 /
- 塑性变形 /
- 不协调响应 /
- 残余应力
Abstract: The influence of no-stress intervals on the fatigue activities is studied by comparing the characteristics of the conventional fatigue tests with those of interval fatigue tests, which combine the cyclic stress and intervals with no stress. The samples from the interval fatigue tests and conventional fatigue tests present a large variety of differences caused by intervals: (1) Under the same conditions of stress, the fatigue lives of samples from the interval fatigue tests are lower more than 50 percent than those from the conventional fatigue tests; (2) The residual deformation of each stress period varies from the duration of interval and increases with it. The accumulated rate of plastic deformation behaves similarly to residual deformation; (3) In the mass, The unloading elastic modulus increases with the stress period number. This parameter of samples from the interval fatigue tests increases as the duration becomes longer. The mechanism of these phenomena is as follows: when the internal flaws develop and grow, the adjacent area yields in different spatial-temporal orders, resulting in uncoordinated response and the corresponding residual stress. Taking into account the Bauschinger effect, the plastic deformation will be larger in the following loading procedure.
- salt rock /
- fatigue life /
- plastic deformation /
- uncoordinate response /
- residual stress

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