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采用复合材料电热实验平台,测试碳纤维树脂基复合材料(Carbon Fiber Reinforced Polymer,CFRP)电热作用下温度场变化规律,同时从单丝拉伸断裂界面剪切强度、短梁剪切性能变化和剪切断口等多方面揭示电热作用对CFRP力学性能的影响机制。结果表明:电热作用会使CFRP整体温度迅速升高,在约4min时达到稳态温度,随着电流强度的增大,CFRP层板表面温度越高,当电流强度为8A(0.44A/mm2)时,CFRP的表面温度达到151℃;单丝拉伸和短梁剪切界面强度都随着电流强度增加呈现先增加后降低的趋势;小电流时,电热作用产生较少的焦耳热,优化界面性能,提高界面剪切强度,大电流时,电热作用产生的焦耳热过大,对界面产生烧蚀等不可逆损伤,降低了界面结合性能。
The temperature field of carbon fiber reinforced polymer (CFRP) was tested by the electric heating experiment platform of composite materials. The shear strength, the change of shear properties and shear of short beam Fracture and other aspects to reveal the electromechanical effect on the mechanical properties of CFRP mechanism. The results show that the overall temperature of CFRP increases rapidly with the electrothermal reaction and reaches the steady state temperature at about 4 minutes. With the increase of the current intensity, the surface temperature of CFRP laminates increases. When the current density is 8A (0.44 A / mm2) , The surface temperature of CFRP reaches 151 ℃. The tensile strength of monofilament and short-beam shear interface firstly increases and then decreases with the increase of current intensity. When the electric current is small, the joule heat decreases with the increase of current intensity. Performance, improve the interfacial shear strength, high current, the Joule heat generated by the electrothermal effect is too large, the interface has ablation and other irreversible damage, reducing the interface bonding performance.