碳/环氧薄壁豆荚杆热-结构性能试验研究

碳纤维增强环氧树脂基复合材料成功应用于航天器结构，其热-结构效应是重点关注问题之一。该文以碳纤维增强环氧树脂基复合材料空间可展天线薄壁豆荚杆为研究对象，通过试验对其材料热物理参数进行测定，得到材料的热物理参数，测得其比热容和导热系数均随着温度升高而增大，符合材料热参数的变化规律。采用大体积真空罐、热沉和红外加热笼模拟空间热环境，对薄壁豆荚杆进行真空热辐射试验，得到试件特征位置处的瞬态、稳态温度场，并采用低温应变片测试特征点应变时程，分析得到薄壁豆荚杆在热辐射作用下纵向、横向及薄壁内外两侧热响应的温度和应变分布规律，为理论分析、数值研究和设计提供参考。

EXPERIMENTAL STUDY ON THERMAL-STRUCTURAL BEHAVIOR OF THIN-WALLED CARBON/EPOXY COMPOSITE BOOM

Carbon/epoxy composites (carbon fiber reinforced epoxy resin composites) have attracted a considerable attention on the utilization in space structures. The material properties and thermal-structural behavior are critical for understanding these structures. Thusly, thermophysical parameters of carbon/epoxy composites are investigated by thermophysical theories, finding that thermal conductivity coefficient and specific heat increase linearly with temperature rise. Moreover, a vacuum tank equipped with a heat sink and an infrared heating cage is utilized to simulate space thermal environment and to evaluate transient and steady temperature distributions on the thin-walled carbon/epoxy composite bar. Thermo-resistances and low-temperature strain gauges are employed to record time-history curves. The temperature and strain distributions in the longitudinal, transverse and thick directions under heat radiation conditions are obtained and analyzed in detail, which is significant for theoretical analysis, numerical simulations and structural design.