采用拉-拉疲劳试验研究了厚1.75mm的340 MPa级热镀锌高强低合金钢的疲劳断裂行为,绘制了其S-N曲线,并采用扫描电镜对其疲劳断裂特征进行了分析.结果表明,340 MPa级热镀锌高强低合金钢在应力比为0.1,加载频率为15Hz的条件下的疲劳极限为190 MPa,其疲劳裂纹源位于表面处,疲劳断口靠近裂纹源处锌层破坏不明显,瞬断处锌层破坏明显.
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