Early stage fatigue damage characterization in aluminum alloys and stainless steels with Meandering Winding Magnetometer technology

V. Weiss, N. Goldfine, M. Natishan
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引用次数: 3

Abstract

It is shown that pre-crack and early stage fatigue damage can be characterized by a new sensor technology, the Meandering Winding Magnetometer (MWM). This new technology consists of a conformable sensor, the MWM, and associated measurement grids that are model based. Measurements on type 304 stainless steel indicated that damage is readily detectable at 20% of life (N/N F = 0.2) and causes a 1.5% conductivity loss. Near failure the conductivity loss in the crack-free region was approximately 4%. In 2024 aluminum the onset of detectable fatigue damage was observed at approximately 50% of total life. For the probe geometry employed, the conductivity loss in the microcrack region iust prior to failure was 7%: in the macrocrack region it reached 13%.
用弯曲绕组磁强计技术表征铝合金和不锈钢的早期疲劳损伤
结果表明,弯曲绕组磁强计(MWM)是一种新型传感器技术,可用于表征材料的预裂纹和早期疲劳损伤。这项新技术由一个兼容的传感器、MWM和相关的基于模型的测量网格组成。对304型不锈钢的测量表明,损坏在寿命的20% (N/N F = 0.2)时很容易检测到,并导致1.5%的导电性损失。接近失效时,无裂纹区域的电导率损失约为4%。在2024铝合金中,可检测的疲劳损伤发生在总寿命的50%左右。对于所采用的探针几何形状,失效前微裂纹区域的电导率损失为7%,而在大裂纹区域,电导率损失达到13%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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