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OALib Journal期刊
ISSN: 2333-9721
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基于堆焊成形钛合金高周疲劳实验数据的r-s-n模型
Keywords: 材料科学基础学科,应力比,疲劳寿命,疲劳极限,r-s-n数学模型
Abstract:
？针对应力比对疲劳寿命影响的问题,以tc18钛合金堆焊成形(利用多层堆焊的方法制备)试样为研究对象,进行了3种应力比(r=0.5、r=0.06、r=-1)的疲劳实验,得出相应的疲劳极限,应用“应力幅值寿命模型”和“三参数寿命模型”得到6条s-n曲线。根据裂纹扩展速率与疲劳寿命的积分关系,以两种疲劳寿命数学模型为基础,系统地研究了应力比(r)与疲劳寿命曲线(s-n)的关系,提出了考虑应力比的疲劳寿命(r-s-n)数学模型。根据本文提出的修正公式,建立了适用tc18钛合金堆焊成形材料的两种r-s-n数学模型,结果表明:用应力幅值寿命模型可对中等疲劳寿命区进行准确的预测,而三参数寿命模型更适合中长寿命区域的预测。提出的两种r-s-n数学模型与实验值吻合良好,并可在工程上预测任意应力比下的疲劳寿命曲线。
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