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对于金属与非金属的复合结构,陶瓷材料,蜂巢结构,特别是非金属薄壁材料的粘接缺陷,热无损探伤技术(TNDT)已经逐渐成为一种很有潜力的无损探伤手段。为了寻求非金属材料粘接缺陷的性质与探测结果之间关系,制作了两组不同几何尺寸的非金属材料人造缺陷样品,具有不同的缺陷厚度d(μm)和不同缺陷深度l(mm),在一定的加热条件下进行实验,利用AGA 780热成象系统进行观测,得到如下结果: 1.不同的缺陷厚度形成的温差ΔT随时间变化过程都有极值ΔT_M存在,对应观测缺陷的最佳时间t_p。只要在最佳探测时间t_p探测缺陷,即可得到最佳探测效果ΔT_M,否则可能出现误检。
For nonmetallic composite structures, ceramic materials, honeycomb structures, especially non-metallic thin-walled materials, thermal nondestructive testing (TNDT) has gradually become a potential nondestructive testing method. In order to find out the relationship between the properties of non-metallic materials and the detection results, two sets of artificial defects samples with different geometrical dimensions were fabricated, with different thickness d (μm) and different depth l (mm) Experiments were carried out under certain heating conditions and observed with the AGA 780 thermal imaging system. The following results were obtained: 1. The temperature difference ΔT formed by different defect thicknesses has the maximum value ΔT_M in the course of time, which corresponds to the best observed defect Time t_p. As long as the detection time at the best detection time t_p defects, you can get the best detection effect ΔT_M, otherwise there may be false positives.