CFRP层板电热作用下温度场及内应力变化

Temperature Field and Internal Stress Change of CFRP Laminates under Electro-Thermal Action

航空器用碳纤维增强树脂(CFRP)复合材料结构在其服役期间会受到复杂环境作用,低强度电流引起的电热作用是 CFRP 复合材料结构特有的、尚未引起足够关注的损伤形式,针对这一现象,以民用航空器用 CFRP 复合材料层板结构为研究对象,采用试验方法和有限元分析软件 ANSYS 对不同直流电流强度作用下的 CFRP 复合材料层板温度场分布和热应力变化进行系统研究和分析。利用复合材料电热测试平台对单向层板和不同角度铺层层板在不同电流强度下的表面温度进行测试。结果表明,电流作用产生的焦耳热使 CFRP 复合材料层板温度迅速升高,随着电流强度增加,其温度随之增加;同时利用 ANSYS有限元软件对其电热温度场模拟,获得电热温度结果与试验结果吻合良好。当电热作用达到稳态温度时,CFRP 复合材料层板内部存在梯度温度;CFRP 复合材料铺层方向对电热温度场大小和分布影响明显,而且电热作用下 CFRP 复合材料层板内应力值与电流强度具有良好的线性关系。

Carbon fiber reinforced polymer (CFRP) composite structures for aircraft will be subjected to complex environmental effects during their service. The electro-thermal effect caused by low-intensity current is unique to the structure of CFRP composites and has not attracted enough attention. In view of this phenomenon,the structure of CFRP composite laminates used in civil aircraft was studied,the temperature eld distribution and thermal stress change of CFRP composite laminates under different DC current intensities were systematically studied and analyzed by using the test method and finite element analysis software ANSYS. The surface temperature of the laminate with different layer structure under different DC current intensity was measured by means of composite electro-thermal test platform. The results show that the Joule heat induced by current causes the temperature of CFRP composite laminates to rise rapidly,as the current intensity increases,the temperature increases. At the same time, ANSYS nite element software was used to simulate the electro-thermal temperature eld, and the electro-thermal temperature results are in good agreement with the experimental results. When the electro-thermal action reaches the steady temperature,the gradient temperature exists in the CFRP composite laminate. The coating direction of CFRP composite has obvious in uence on the size and distribution of electro-thermal temperature eld,and there is a good linear relationship between the internal stress value and current intensity of CFRP composite laminate subjected to electro-thermal action.