(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 采用熱彈塑性有限元數(shù)值模擬方法，研究了連接溫度對(duì)C/C復(fù)合材料與Cu平面對(duì)接接頭殘余應(yīng)力的影響。結(jié)果表明：最大拉應(yīng)力的分布具有方向性，在連接界面法線方向上，最大拉應(yīng)力出現(xiàn)在靠近接頭界面的C/C復(fù)合材料側(cè)，位于連接件的棱邊上；在平行連接界面方向上，最大拉應(yīng)力出現(xiàn)在靠近接頭界面的Cu側(cè)表面。最大剪切應(yīng)力位于接頭界面處。隨著連接溫度的升高，接頭殘余應(yīng)力峰值逐漸增大，但接頭殘余應(yīng)力的分布形態(tài)相似。對(duì)于連接界面尺寸為4 mm×4 mm的接頭，在連接溫度為1 000 ℃時(shí)，離接頭界面1.2 mm的C/C復(fù)合材料側(cè)最容易發(fā)生斷裂。
關(guān)鍵字: C/C復(fù)合材料；Cu；連接溫度；殘余應(yīng)力
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The effect of joining temperature on the residual stress in carbon/carbon (C/C) composites and copper plane butt joints was studied using thermal-elastic-plastic finite element method. The results show that the distribution of the maximum tensile stress has directionality. The maximal value of the tensile stress vertical to the joined surface is at the C/C composites side near the interface. However, in parallel to the joined surface, the maximal tensile stress reaches on the Cu side near the interface. The maximal shear stress is found at the interface. With the increase of the joining temperature, the maximal residual stress increases, but the residual stress distribution is similar. When the size of the interface is 4 mm×4 mm at 1 000 ℃, the fracture may occur mostly at the C/C composites side near interface at a distance of 1.2 mm from the edge.
Key words: C/C composites; copper; joining temperature; residual stress
