In this study, the stress relaxation effect on the fatigue cycles-to-failure of the biaxial elastic fibre prestressed woven composite (E-glass/polyester) was investigated. The fibre pretension load was applied prior and during matrix cure, and then it has been released to induce compressive residual stresses within the matrix. The longevity of these stresses is questionable, and it needs investigation. The time of residual stress redistribution or relaxation was estimated experimentally for the E-glass fibre prestressing level be equal to 50 MPa. Residual stresses within the polyester matrix have declined by (27%) throughout 110 days leading to reduce the improved fatigue life by about 14% due to the stress relaxation process within the polyester matrix material. The study showed that even though the stress relaxation in the matrix reduced the improved fatigue cycles of the biaxial elastic prestressed E-glass fabric/polyester resin system, some improvement still is possible for long-term performance.

在这项研究中，研究了应力松弛对双轴弹性纤维预应力编织复合材料（电子玻璃/聚酯）的疲劳破坏循环的影响。在基体固化之前和固化过程中施加纤维预拉伸载荷，然后释放纤维预拉伸载荷，以在基体内产生压缩残余应力。这些压力的寿命是否值得怀疑，需要进行调查。对于E玻璃纤维预应力水平等于50 MPa的实验，估计了残余应力的重新分布或松弛时间。在整个110天中，聚酯基体内的残余应力下降了（27％），这归因于聚酯基体材料内的应力松弛过程，使疲劳寿命降低了约14％。