用于非比例载荷下疲劳分析的最大最小循环计数法
发布时间:2018-04-02 04:26
本文选题:非比例载荷 切入点:多轴疲劳 出处:《热能动力工程》2017年08期
【摘要】:研究了最新ASME-Ⅷ-2规范推荐的用于非比例载荷下循环计数的最大最小循环计数法。首先通过定义最大最小循环计数法在应力-应变迟滞回线上的循环路径,赋予了最大最小循环计数法合理的物理意义。然后结合von-Mises损伤准则和Miner线性损伤累积理论,编写了非比例加载下使用最大最小循环计数法进行疲劳循环计数的实用程序,并成功应用该程序实现了对某核电站振动小支管疲劳寿命的预测。对比了非比例载荷下最大最小循环计数法和传统雨流计数法的循环统计结果,表明非比例载荷下最大最小循环计数法统计的等效应力幅值约为雨流法的1.085倍,循环次数约为雨流法的1.478倍。
[Abstract]:The paper studies the maximum minimum cycle count method recommended by ASME - VIII - 2 specification for non - proportional loading . First , by defining the cyclic path of the maximum minimum cycle count method on the stress - strain hysteresis loop , the paper gives the most reasonable physical meaning of the maximum minimum cycle count method . The maximum minimum cycle count method under non - proportional loading is used to predict the fatigue life of the small branch pipe of a nuclear power plant . The maximum minimum cycle count method under the non - proportional loading is compared with 1.085 times of the rain flow method , and the number of cycles is about 1.478 times of the rain flow method .
【作者单位】: 西安热工研究院有限公司;福建宁德核电有限公司;
【分类号】:O346.2
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本文编号:1698788
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