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材料工程  2011 

2A50锻铝三点弯曲试验与高分辨率CT成像分析

, PP. 13-16

Keywords: 疲劳裂纹,三点弯曲试验,高分辨率CT,可视化,危险度因子

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Abstract:

采用高频疲劳试验机对2A50锻铝缺口试样进行了三点弯曲试验,获得了含裂纹的CT检测试样。对疲劳试样进行了高分辨率CT三维重建,分析了裂纹CT图像的损伤特点;引入了参考平面,将不同层的裂纹CT图像映射到参考平面定义了截面损伤危险度因子。CT分析结果表明裂纹扩展过程中不同部位的疲劳损伤不均匀,三维可视化结果直观显示了裂纹的三维形态;截面损伤危险度因子约为0.34,缺陷面积为最严重损伤截面面积的2.1倍,截面损伤危险度因子与疲劳周次呈单调递增关系,可用于度量工件的损伤状态。

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