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一、前 言 近年来我们研究了GFRP带孔层板疲劳性能。孔的形式有单圆孔和单方孔两种。目的是比较两种孔的形式可能造成交变载荷下层板寿命的变化。在铺层方面做了0°/90°及±45°两种层板。通过静力测定和疲劳试验得到一些有用的结果。试验表明,对两种铺层的带孔板,尽管拉伸强度与不带孔的相比有一定的下降,但它们的疲劳极限(指经5×10~6次未破坏的试件上实际作用应力)却非常接近。这说明开孔引起的应力集中并没有给GFRP层板的疲劳性能造成不利的影响。从两种开孔形式比较来看,
I. Introduction In recent years, we have studied the fatigue properties of GFRP perforated plates. Hole in the form of a single hole and single hole two. The purpose is to compare the form of two holes that may cause changes in plate life under alternating load. Layered in the 0 ° / 90 ° and ± 45 ° made two laminates. Some useful results are obtained by static test and fatigue test. Experiments show that the two kinds of laminated perforated plate, although the tensile strength and non-perforated compared to a certain decline, but their fatigue limit (refers to the 5 × 10 ~ 6 non-destructive test on the actual Acting stress) is very close. This shows that the stress concentration caused by the openings did not adversely affect the fatigue properties of GFRP laminates. Comparison of the two forms of openings from the point of view,