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塑料型复合材料,特别是玻璃纤维增强塑料,广泛用作致冷机的绝缘和结构材料。 本文阐明了玻璃纤维增强塑料的用途,并与其他复合材料相比较,特别对深冷低温下的应力/应变特性作了论述。玻璃纤维增强塑料,是在温度为77°K时延伸率继续增长的唯一复合材料。但在其应力/应变图上有一个确定的拐点,在这拐点处树脂基体出现明显裂纹。拐点处或裂纹出现时,复合材料延伸率则取决于树脂基体的延伸率。
Plastic composite materials, especially glass fiber reinforced plastics, are widely used as insulation and structural materials for refrigerators. This article illustrates the use of glass fiber reinforced plastics and compares them with other composites, especially stress / strain behavior at cryogenic temperatures. Glass fiber reinforced plastic is the only composite material that continues to grow at 77 ° K. However, there is a definite inflection point in its stress / strain diagram where the resin matrix shows a significant crack. At inflection points or cracks, the elongation of the composite depends on the elongation of the resin matrix.