为了研究平均应变对7050-T7451铝合金低周疲劳力学行为的影响,开展了不同应变比(R=-1、-0.06、0.06和0.5)下的室温恒幅低周疲劳试验.结果表明:在对称循环应变下,材料总体表现为循环软化特征；而在非对称循环应变下,材料表现为初始硬化后的循环稳定行为.非对称循环应变导致了材料出现与应变幅相关的平均应力松弛现象.采用Landgraf模型和非线性Maxwell模型分别研究了7050-T7451铝合金的平均应力松弛规律.结果表明:Maxwell模型能够较准确地描述材料的平均应力循环松弛特征,而Landgraf模型更适用于低应变幅下的平均应力松弛描述.
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