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首页> 外文期刊>Journal of Composite Materials >A new method to reduce cure-induced stresses in thermoset polymer composites, Part III: correlating stress history to viscosity, degree of cure, and cure shrinkage
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A new method to reduce cure-induced stresses in thermoset polymer composites, Part III: correlating stress history to viscosity, degree of cure, and cure shrinkage

机译：减少热固性聚合物复合材料中固化引起的应力的新方法，第三部分：将应力历程与粘度，固化程度和固化收缩率相关联

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摘要

Non-thermoelastic effects such as cure shrinkage of a polymer can play a role in residual stresses in composite parts. Studies have shown that cure shrinkage can place significant stresses on fibers. Therefore, the cure cycle of 3501-6 epoxy resins was modified to change its cure shrinkage characteristics to minimize the stresses. New cure strategies were developed using volumetric dilatometry, differential scanning calorimetry, dielectric cure monitoring, and a unique single fiber stress test method. Cure cycles were modified to balance the resin's thermal expansion with its cure shrinkage. In some cases, a region of constant volume was achieved for a short time. However, the cure shrinkage eventually dominated over thermal expansion in all cycles as the polymer gelled. Changing the cure cycle affected the degree of cure at the point where the fiber/matrix interface developed as well as the amount of cure shrinkage occurring afterwards. A higher degree of cure at this point leads to longer stress relaxation time. Furthermore, less cure shrinkage at this point leads to less stress on the fibers. Also, slow heating rates allow more time for the polymer to relax and relieve stresses caused by cure shrinkage. Finally, a cure cycle that minimizes stresses due to cure shrinkage has been demonstrated.
机译：非热弹性效应（例如聚合物的固化收缩）可以在复合零件的残余应力中起作用。研究表明，固化收缩率可以对纤维施加很大的应力。因此，修改了3501-6环氧树脂的固化周期，以更改其固化收缩特性，以最大程度地降低应力。使用体积膨胀法，差示扫描量热法，介电固化监测和独特的单纤维应力测试方法开发了新的固化策略。修改了固化周期，以平衡树脂的热膨胀与固化收缩率。在某些情况下，会在短时间内达到恒定体积的区域。但是，随着聚合物胶凝，固化收缩率最终在所有循环中都超过热膨胀。改变固化周期会影响纤维/基体界面形成时的固化程度以及此后发生的固化收缩量。此时更高的固化度会导致更长的应力松弛时间。此外，此时较少的固化收缩导致纤维上的应力较小。同样，缓慢的加热速率使聚合物有更多的时间松弛并减轻由固化收缩引起的应力。最后，已经证明了使固化收缩引起的应力最小的固化循环。

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