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基于动态响应特性的点焊疲劳损伤参量

Keywords: 疲劳损伤,动态响应频率,点焊接头

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Abstract:

针对不同疲劳损伤累积量,研究了点焊疲劳试件的固有频率变化特性.研究结果表明,试件的固有频率与所承受的循环数比成非线性关系.提出了一个由固有频率相对变化来描述的疲劳损伤参量,并利用疲劳损伤理论,建立了非线性疲劳损伤演化模型.结果表明,所提出的疲劳损伤参量能够很好地描述点焊接头疲劳损伤特性,疲劳寿命预测误差在两个因子之内.

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