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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.5: High-Pressure Technology... >THREE-DIMENSIONAL IDENTIFICATION OF SEMI-ELLIPTICAL CRACK ON THE BACK SURFACE BY MEANS OF DIRECT-CURRENT ELECTRICAL POTENTIAL DIFFERENCE METHOD WITH MULTIPLE-PROBE SENSOR
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THREE-DIMENSIONAL IDENTIFICATION OF SEMI-ELLIPTICAL CRACK ON THE BACK SURFACE BY MEANS OF DIRECT-CURRENT ELECTRICAL POTENTIAL DIFFERENCE METHOD WITH MULTIPLE-PROBE SENSOR

机译：利用多探头直接电流电势差方法对后表面半椭圆裂纹进行三维识别

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摘要

A method of three-dimensional identification of a semi-elliptical crack existing on the back surface of a conductive plate by direct-current electrical potential difference method with a multiple-probe sensor was proposed. The geometrical condition of the crack was specified by six parameters, the surface and inward angles of the crack plane, θ_(sur) and θ_(in), the length and depth of the crack, c and a, and the two-dimensional location of the crack center, (y_c, z_c), on the back surface, respectively. Identification was carried out based on the distribution of electrical potential difference on the surface of the plate measured with a sensor composed of grid-arranged multiple probes called the "multiple-probe sensor." As an approximate cracked body and a quick analysis method were used, a number of repeated electrical potential field analyses necessary for the identification of the crack became possible within a practical time. The validity of the method was numerically confirmed by carrying out the identification based on the result by the finite element analysis.
机译：提出了一种利用多探针传感器的直流电势差法对存在于导电板背面的半椭圆形裂纹进行三维识别的方法。裂纹的几何条件由六个参数指定，即裂纹平面的表面和向内角，θ_（sur）和θ_（in），裂纹的长度和深度，c和a以及二维位置裂纹中心的（y_c，z_c）分别位于背面。基于用由网格排列的多个探针组成的传感器（称为“多探针传感器”）测量的板表面上的电势差的分布进行识别。由于使用了近似的裂纹体和快速分析方法，因此在实际时间内可以进行许多重复的电势场分析，以识别裂纹。通过基于有限元分析结果的识别，在数值上证实了该方法的有效性。

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