Composite materials for space applications
Composite materials for space applications
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空间应用复合材料
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
R. Wendt
中科院分区：
文献类型：
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作者：
S. Rawal;M. Misra;R. Wendt
该计划的目标是：为制造的先进材料生成机械、热和物理性能测试数据；设计和制造加速热循环室；以及确定热循环对复合材料热机械性能和尺寸稳定性的影响。在本项目中，对各种有机基质、金属基质、玻璃基质和碳/碳复合材料进行了广泛的力学和热物理性能测试，为航天器材料的选择建立了可靠的数据库。大多数预制复合材料的材料性能结果与预测值一致，提供了在制造过程中达到的固结完整性的衡量标准。为了确定热循环对力学性能、微裂纹和热膨胀行为的影响，将大约500个复合材料试件暴露在-150到+150华氏度之间的10,000次循环中。这些试件被放置在一个专门设计和制造的大型(18立方英尺工作空间)热循环室中，以模拟20天一年的低地球轨道(LEO)热循环。以这样的热循环速度，这是全国最大的热循环机组。热循环有机基复合材料层合板的材料性能测试表明，强度下降不到24%，而其余材料的强度下降不到8%。每个热循环试件的热膨胀响应都显示出明显的滞后和残余应变的减少，平均CTE值接近预测值。
The objectives of the program were to: generate mechanical, thermal, and physical property test data for as-fabricated advanced materials; design and fabricate an accelerated thermal cycling chamber; and determine the effect of thermal cycling on thermomechanical properties and dimensional stability of composites. In the current program, extensive mechanical and thermophysical property tests of various organic matrix, metal matrix, glass matrix, and carbon-carbon composites were conducted, and a reliable database was constructed for spacecraft material selection. Material property results for the majority of the as-fabricated composites were consistent with the predicted values, providing a measure of consolidation integrity attained during fabrication. To determine the effect of thermal cycling on mechanical properties, microcracking, and thermal expansion behavior, approximately 500 composite specimens were exposed to 10,000 cycles between -150 and +150 F. These specimens were placed in a large (18 cu ft work space) thermal cycling chamber that was specially designed and fabricated to simulate one year low earth orbital (LEO) thermal cycling in 20 days. With this rate of thermal cycling, this is the largest thermal cycling unit in the country. Material property measurements of the thermal cycled organic matrix composite laminate specimens exhibited less than 24 percent decrease in strength, whereas, the remaining materials exhibited less than 8 percent decrease in strength. The thermal expansion response of each of the thermal cycled specimens revealed significant reduction in hysteresis and residual strain, and the average CTE values were close to the predicted values.