镍基单晶合金的低周疲劳(LCF)晶体取向相关性和其弹塑性的晶体取向相关性有密切关系,基于所建晶体取向各向异性弹塑性晶体滑移模型,本文推导了复杂应力状态下镍基单晶合金低周疲劳寿命预测模型,结论为LCF寿命与修正的滑移应变呈指数关系.在详细分析薄壁圆筒试样受拉扭载荷下应力应变分布规律的基础上,利用不同拉扭载荷下的低周疲劳寿命数据,对本文所提模型进行了成功的考核.
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