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文章提出了测量固体内裂纹生长的方法。所说的固体内具有预成形裂纹且暴露在腐蚀环境中,并对其施加足以使裂纹生长的载荷。在固体中通电流经裂纹,建立电压降。至少由两对位于裂纹深度99％的探头来测量电压,每对探头的两个膜片位于同一裂纹的两侧并已知距裂纹开口的距离。每对探头测得的电压相对距离(每对探头距裂纹开口的距离)描绘出来,通过这些点,拟合出电压对距离的最佳拟合直线。将该直线延长得到电压为零时在轴线上的截距,通过监测截距值随时间的变化来决定裂纹深度的变化。其目的是提供一种装置和方法,来测量和监视腐蚀环境中的构件的损坏,还可作为构件瞬时和积累损坏的测量方法。测量裂纹的生长尺寸可小到0.0001英寸。
The article presents a method for measuring the growth of solid internal cracks. The solid has pre-formed cracks therein and is exposed to a corrosive environment and is subjected to a load sufficient to cause cracks to grow. Pass current through the solid in a crack and establish a voltage drop. The voltage is measured by at least two pairs of probes located at 99% of the depth of the crack. The two diaphragms of each pair are located on either side of the same crack and the distance from the crack opening is known. The voltage relative distance measured by each pair of probes (the distance from each pair of probes to the crack opening) is plotted against which the best fit voltage for the distance is fitted. The straight line is extended to obtain the intercept of the axis at zero voltage, and the change of the crack depth is determined by monitoring the intercept value with time. Its purpose is to provide an apparatus and method for measuring and monitoring damage to components in a corrosive environment and also as a measure of instantaneous and cumulative damage to components. Crack growth measurements can be as small as 0.0001 inches.