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对带有表面裂缝的(±55°)3缠丝组合管,在交互的内压力作用下的疲劳性能进行了研究。玻纤加固塑胶管由E玻纤/环氧组成,在末端开口条件下试验。建立了PLC控制水压试验,试验样本由±55°缠绕角度的反对称6层缠丝构成。按照ASTM D-2992标准,对表面带裂缝、沿轴向切口比为0.2,切口厚度比分别为0.25、0.38和0.50的管进行了疲劳试验。这个标准允许每分钟25次循环以及R=0.05的应力比率。在三种不同最大应力水平,即极限循环应力的50%,40%以及30%水平下进行了试验。对GRP管的最终破坏进行了研究,借助(SN)曲线和分层破坏区-周期(AN)曲线提出了破坏试验的结果。
The fatigue behavior of the (± 55 °) 3 wrapper with surface cracks under internal pressure was studied. Glass fiber reinforced plastic tube E glass / epoxy composition, the end of the opening test conditions. A PLC controlled hydrostatic pressure test was established. The test specimen consisted of an anti-symmetrical 6-layer wire wound at ± 55 ° winding angle. Fatigue tests on tubes with cracks on the surface, axial incision ratio of 0.2, incision thickness ratios of 0.25, 0.38 and 0.50, respectively, were performed according to the ASTM D-2992 standard. This standard allows 25 cycles per minute and a stress ratio of R = 0.05. Experiments were conducted at three different maximum stress levels, 50%, 40% and 30% of the ultimate cyclic stress. The final failure of GRP pipe was studied, and the result of sabotage test was put forward by means of (SN) curve and stratified failure zone - cycle (AN) curve.