陶瓷基复合材料螺栓渐进损伤计算与强度预测 <bold/>

朱宝城; 高希光; 宋迎东

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陶瓷基复合材料螺栓渐进损伤计算与强度预测
朱宝城^1,2,高希光^1,2,宋迎东^1,2,3
1.南京航空航天大学能源与动力学院，航空发动机热环境与热结构工业和信息化部重点实验室，江苏南京 210016;2.南京航空航天大学能源与动力学院，江苏省航空动力系统重点实验室，江苏南京 210016;3.南京航空航天大学机械结构力学及控制国家重点实验室，江苏南京 210016

摘要:

为了准确预测陶瓷基复合材料螺栓的强度及损伤演化过程，建立了陶瓷基复合材料螺栓有限元模型，并采用渐进损伤模型实现了陶瓷基复合材料螺栓的失效分析，形成通用有效的陶瓷基复合材料结构渐进损伤有限元仿真方法。计算结果表明：陶瓷基复合材料螺栓在载荷1129N时萌生损伤。加载到失效载荷（1459N）时，损伤沿着螺纹槽扩展至整个螺纹槽。最后，损伤从螺纹槽扩展至螺杆中心导致螺杆断裂失效。螺栓的破坏位置在螺纹接触最上面的螺纹槽处，螺栓断裂的主要原因是材料的 Z向拉伸破坏。

关键词: 陶瓷基复合材料渐进损伤失效载荷损伤演化失效模式

DOI：10.13675/j.cnki.tjjs.180747

分类号:TB332

基金项目:国家重点研发计划（2017YFB0703200）；国家自然科学基金（51575261；51675266）。

Progressive Damage Calculation and Strength Prediction of Ceramic Matrix Composites Bolt

ZHU Bao-cheng^1,2,GAO Xi-guang^1,2,SONG Ying-dong^1,2,3

1.Key Laboratory of Aero-Engine Thermal Environment and Structure，Ministry of Industry and Information Technology，College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics， Nanjing 210016， China;2.Jiangsu Province Key Laboratory of Aerospace Power System，College of Energy and Power Engineering， Nanjing University of Aeronautics and Astronautics， Nanjing 210016， China;3.State Key Laboratory of Mechanics and Control Mechanical Structures，Nanjing University of Aeronautics and Astronautics， Nanjing 210016， China

Abstract:

In order to accurately predict the strength and damage evolution process of ceramic matrix composite(CMCs)bolt， a finite element model of ceramic matrix composite bolt was established. Based on the progressive damage model, the failure analysis of ceramic matrix composite bolt was realized.A general and effective finite element simulation method for progressive damage of CMCs structure was developed. The results show that the damage of CMCs bolt originated under 1129N. When loaded to the failure load (1459N), the damage extended along the thread groove to the entire groove. Finally, the damage extended from the thread groove to the center of the screw leading to the failure of the screw.The failure position of bolt was at the thread groove of the top of the thread contact. The main reason of the bolt fracture was the Z-direction tensile failure.

Key words: Ceramic matrix composites Progressive damage Failure load Damage evolution Failure mode