对玻璃布和玻璃毡交替铺放的玻璃钢,钻有圆孔的试样,进行了10,000次低频疲劳试验,得到如下的结果: (1)S—N曲线在半对数坐标上呈现为直线; (2)各试样的S—N曲线大体上平行。S—N曲线的斜率随着圆孔半径的增加而稍有减少。 (3)在本试验范围内,拉伸强度和疲劳强度也随圆孔半径增加而降低。 For the glass fiber reinforced glass and the glass fiber laying alternately laying on the glass fiber reinforced plastic, the hole-punched sample was subjected to 10,000 low-frequency fatigue tests, the following results were obtained: (1) The S-N curve appears as a straight line on the semi-logarithmic scale; (2) The S-N curves of each sample are substantially parallel. The slope of the S-N curve decreases slightly as the radius of the circular hole increases. (3) Within the scope of this test, tensile strength and fatigue strength also decrease with increasing radius of the circular hole.