４．８冲击试验用高精度侧膨胀仪杨文斗，毕全富，马慧筠侧膨胀是指冲击断头缺口背面的横向变形量ｘ与试样原尺寸１０ｍｍ之差，即（ｘ－１０）值。它不能用卡尺或千分尺测量，因为冲击断口是三维变形，被测的两点不在同一平面，同一直线上，故需专用量具。图１（ａ）是美... 4.8 Impact test with high-precision side dilatometer Yang Wendou, Bi Quandu, Ma Huiyun side expansion refers to the back of the impact of breakage on the back of the lateral deformation x and the original size of the sample 10mm difference, that is (x-10) value. It can not be measured with a caliper or micrometer, because the impact fracture is a three-dimensional deformation, the measured two points are not in the same plane, the same line, it requires special measuring tools. Figure 1 (a) is the United States ...