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飞机主承力构件疲劳裂纹萌生和扩展的声发射评价

点击数:2140发布:2018-06-06 来源:

l、概况
幸运飞艇彩票开奖网站 我所曾对某型飞机进行了全尺寸疲劳试验,以解决该型飞机的定寿问题。这一试验为利用声发射监测飞机关键部位疲劳裂纹形成和扩展提供了极好的机会。为进行疲劳定寿,每进行到一定飞行小时试验后,需停止疲劳试验并对一些主承力构件(如飞机机翼主梁连接螺栓)进行分解检查、探伤并测试裂纹大小,必要的话要利用断口分析来反推裂纹萌生的初始时间。在整个疲劳试验过程中,通常要进行几次分解和拆卸检查,目的是要确定一些难以或不可接近部位的损伤程度,这无疑会给疲劳试验增加许多困难。我们在疲劳试验过程中对该飞机的一些关键部位的裂纹萌生和扩展情况用声发射进行了跟踪监测,取得了不少满意的结果。

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