摘要
根据复合材料失效的特点,基于渐进损伤分析方法的基本原理,提出一种高速动车组复合材料设备舱结构强度的仿真评价方法。通过选取合适的失效准则和线性损伤演化方式模拟复合材料层合板的损伤起始和损伤演化,建立复合材料渐进损伤分析模型;对复合材料设备舱骨架在气密载荷作用下进行静强度评价;通过对横梁持续加载的方式进行设备舱骨架的有限元破坏分析,根据载荷-位移曲线得到此设备舱骨架的极限承载能力和失效模式。研究结果表明:综合对比Tsaiwu失效准则和Hashin失效准则的结果,此复合材料设备舱骨架的静强度能够满足7 500 MPa气密载荷的要求,其中Tsai-wu失效准则得到的强度结果较为保守;复合材料设备舱骨架的最大承载能力为22.98 kN,此时横梁处最大变形量为12.4 mm;最终破坏时各个连接支架的铆钉孔孔边以及横梁的螺栓孔孔边发生不同程度的损伤,主要模式为基体拉伸失效。
According to the characteristics of composite failure and the basic principle of progressive damage analysis method,a simulation evaluation method for the structural strength of composite equipment cabin of EMU was proposed.The damage initiation and damage evolution of composite laminates were simulated by selecting appropriate failure criteria and linear damage evolution mode,and the progressive damage analysis model of composite materials was established.Static strength analysis of the composite equipment cabin framework under the airtight load condition was implemented.The finite element failure analysis of equipment cabin framework was carried out by means of continuous loading to the cross-beam.The ultimate failure load and failure mode of the equipment cabin framework was predicted according to the load-displacement curve.The results show that by comparing the results of Tsai Wu failure criterion and Hashin failure criterion,the static strength of the composite equipment cabin framework can meet the requirements when the airtight load is 7500 MPa,and the static strength results using Tsai-wu failure criterion is relatively conservative.The ultimate failure load of the composite equipment cabin framework is 22.98 kN, and the maximum deformation at the cross-beamis 12.4 mm. When the final failure occurs, the rivet hole edge of each connecting bracket and the bolt hole edge ofthe cross-beam have different degrees of damage, and the main damage mode is matrix tensile failure.
作者
董瑞雪
刘志明
DONG Ruixue;LIU Zhiming(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第6期1392-1401,共10页
Journal of Railway Science and Engineering
基金
“十三五”国家重点研发计划资助项目(2016YFB1200505-011)。
关键词
复合材料
渐进损伤
设备舱
结构强度
评价方法
composite
progressive damage
equipment cabin
structural strength
evaluation method
