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本文通过实验研究了ＬＹ—１２硬铝合金在单向拉伸疲劳载荷下表面裂纹形状的变化规律，由实验数据处理得到了适用于ＬＹ—１２硬铝合金材料疲劳寿命计算的关系式。研究表明，拉伸疲劳时表面裂纹扩展速率可用Ｐａｒｉｓ公式描述。
In this paper, the variation of surface crack shape of LY-12 hard aluminum alloy subjected to uniaxial tensile fatigue load was experimentally studied. The relationship between the fatigue life of LY-12 hard aluminum alloy and the fatigue life of LY-12 hard aluminum alloy was obtained by experimental data processing. The research shows that the surface crack propagation rate under tensile fatigue can be described by Paris formula.