Q235低碳钢受拉平板开孔周边力-磁效应的实验研究

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For flat plate of Q-235 Carbon Steel which thickness is 4,5 and 6 mm,the small hole that diameter is 3,5 and 7 mm was prefabricated in the center of each and the force of 9,18 and 27 kN was loading at the both end.The magnetic signal on the surface of the plate under the state of static tension conditions was detected by using CMT5305 and TSC-1M-4 test instruments.It is found that the magnetic signal on the surface of the scheme is interrelated with stress concentration around the hole and diameter of the hole,independentd with thickness and load of the plate.以厚度为4,5,6mm厚Q235材料平板为试件,分别在板中心预制直径为3,5,7mm小孔缺陷并对板施加9,18,27kN载荷,用CMT5305拉伸试验机和TSC-1M-4磁记忆检测仪测试了不同试件在受力状态下开孔周边的磁场效应。测试表明,开孔周边的磁场效应与板的应力集中和孔径有关,与板厚和载荷大小无关的结论。