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    APPLICATION OF DAMAGE RULES TO TIME-DEPENDENT FATIGUE LIFE PREDICTION
    损伤法则在时间相关疲劳寿命预测中的应用
    Modification of the Rule of Fatigue AccumulatingDamage by Fuzzy Mathematics Method
    模糊数学方法对疲劳累积损伤法则的修正
    Then, according to the S-N curve which is offered by the IIW and the Palmagren-Miner cumulative damage rule, the fatigue life of the welded frame are predicted based on the dynamic stress spectrum.
    然后,基于线路动应力测试得到的动应力谱,考虑焊接结构的特殊性,以国际焊接学会IIW标准中疲劳设计规范提供的焊接接头S-N曲线数据库为依据,利用Palmgren-Miner累积损伤法则,对该转向架焊接构架进行了疲劳寿命预测。
    On the assumption that Miner's linear cumulative damage theory may be applicable to machine parts under the random loading,and based on the theory analyses of random process,this paper introduced some parameters such as the plastic strain energy was absorbed by materials sand damage degree.
    在假定 Miner 线性累积损伤理论对于受随机载荷的零构件可以适用的前提下,在随机理论分析基础上,引入材料所吸收的塑性应变能和损伤度等参量,在等能量损伤法则下推算出稳态条件下随机载荷的等价常幅应力,推出随机载荷下的期望寿命估算公式。
    Based on weld joint S-N curves provided by IIW standard and dynamic stress spectrum tested on line,fatigue life prediction for weld frame of speed-up bogie is conducted.
    基于线路动应力测试得到的动应力谱,考虑焊接结构的特殊性,以国际焊接学会IIW标准中疲劳设计规范提供的焊接接头S-N曲线数据库为依据,利用Palmgren-M iner累积损伤法则,对某提速客车转向架焊接构架进行了疲劳寿命预测.
    And at the present time, for highway bridge and industrial and civil buildings, applicable codes of steel structure (such as GB50017-2003) generally use simple linear accumulation damage standard and a given structure requirement to guarantee that there are no fatigue failures in structures or elements during the usage time. Their applicability is narrow and the results of calculation are not exact. Even are they useless to the fatigue analysis for complex structures and elements.
    而目前针对公路桥梁和工业与民用建筑钢结构的现行规范(如GB50017-2003)一般仅通过简单的线性累积损伤法则和一定的构造要求来保证结构或构件在使用期间不发生疲劳破坏,适用范围较窄,计算结果比较粗糙,对于复杂结构或构件的疲劳分析更是无能为力。
    Crack propagation life of welded structures in variable amplitude load is studied by combining equivalent stress method and Miner linear damage accumulation theory.
    采用等效应力法和Miner线性累积损伤法则相结合的方法对焊接结构在变幅载荷下裂纹扩展寿命进行了研究。
    In accordance with the accumulated damage rule and the accumulated frequency curves, the principles of application of the five count methods are given.
    由累积频次曲线,按照累积损伤法則,给出五种计数方法的应用原则。
    For creep-fatigue life prediction under condition of the tension-tensile stress inthe past,in the most case,the Linear Cumulative Damage Rule was adopted.
    拉-拉应力条件下蠕变疲劳寿命预测,过去,在大多数情况下,采用线性累积损伤法则
    By applying fuzzy mathematics method in the calculation of fatigue damage,four model subordinate functions are constructed and the rule of fatigue accumulating damageis modified.
    将模糊数学方法用于疲劳损伤计算,构造出了用于损伤计算的4种典型的隶属函数,对疲劳累积损伤法则进行了修正完善。
    The equations for calculating the thermal fatigue damage andcreep deformation damage of the brake disc under the action or variable stress at variable temperature during a well servicing operation are worked out based on the thermal fatigue theory and ereep deformation theoly, and the equation for calculating the service life of the brake disc is derived according to the fatigue-ereep linear superposition principle of damage And it is indicated that the disc fails while the total damage φ is more than 1.
    依据热疲劳理论和蠕变理论导出了一次下放管柱作业过程中在变动温度、变动应力作用下制动盘的热疲劳损伤及蠕变损伤的计算公式,并根据疲劳-蠕变线性累积损伤法则导出制动盘破坏的寿命计算公式,认为总损伤φ≥1时,制动盘失效。
    In addition,a linear damage summation method is chosen to predict creep fatigue lifetime.
    此外,利用线性累积损伤法则对蠕变-疲劳寿命进行了预测。
    The model for the predictions assumes that the fatigue crack initiation period(N I) is the number of cycles for the initiation of a fatigue crack and its early growth and coalescence into a dominant fatigue crack. N I is estimated using strain-controlled fatigue data and the Palmgren-Miner linear damage cumulation rule through Knowledge of the local stress and strain response at the tip of the notch.
    该模型把疲劳裂纹起始寿命看成是疲劳裂纹萌生、早期生成并聚合成主疲劳裂纹的循环次数,利用应变控制疲劳数据和Palmgren_Miner 线性累积损伤法则以及缺口尖端局部应力应变响应知识计算的。
 

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