摘要
为研究侧面涂层和应变隔离垫厚度及两者刚度对刚性隔热瓦及组件力学性能的影响,构建一种对称结构的刚性隔热瓦分析模型,进行了拉伸试验和有限元分析。结果表明,在拉伸载荷作用下刚性隔热瓦的应力分布不均匀,具有明显应力集中现象,其拉伸强度水平与最大应力密切相关,随涂层厚度或刚度增加,刚性隔热瓦最大应力上升,拉伸强度降低;当刚性隔热瓦粘结应变隔离垫时,应变隔离垫厚度增加或刚度减小,刚性隔热瓦最大应力下降,拉伸强度增大;当刚性隔热瓦含涂层时,增加应变隔离垫可减缓涂层对刚性隔热瓦的影响;并对有限元分析结果进行了试验验证,计算结果与试验结果吻合良好,表明建立的刚性隔热瓦分析模型合理,揭示了涂层和应变隔离垫参数与刚性隔热瓦失效的关联关系。
In order to research the effects of the thickness and stiffness of the side coating and strain isolation pad on the mechanical properties of the rigid thermal insulation tile and its components,a rigid thermal insulation tile analytical model with a symmetrical structure was constructed,finite element analysis(FEA)and static tensile test were carried out.The FEA results showed that the stress distribution of the rigid thermal insulation tile was not uniform under the action of tensile load,and there was obvious stress concentration,and its tensile strength level was closely related to the maximum stress.With the increase of coating thickness or stiffness,the maximum stress of the rigid thermal insulation tile increased,and the tensile strength decreased.When the rigid thermal insulation tile was bonded to the strain isolation pad,the maximum stress of the rigid thermal insulation tile decreased,and the tensile strength increased,while the thickness of the strain isolation pad increase or the stiffness decrease.When the rigid thermal insulation tile was coated,the strain isolation pad would reduce the effect of the coating on the rigid thermal insulation tile.The finite element analysis results were verified by static tensile tests,and the calculated results agreed well with the test results.The results showed that the analytical model was reasonable,the failure of the rigid thermal insulation tile were correlated with the coating and strain isolation pads.
作者
张耕源
蒋劲松
孙陈诚
李大涛
ZHANG Gengyuan;JIANG Jinsong;SUN Chencheng;LI Datao(Chengdu Aircraft Design&Research Institute,Strength Design Department,Chengdu 610041;Science and Technology on Advanced Functional Composites Laboratory,Aerospace Research Institute of Materials&Processing Technology,Beijing 100076;Chang’an University,School of Construction Machinery,Xi’an 710064)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2022年第3期76-80,共5页
Aerospace Materials & Technology
关键词
刚性隔热瓦
有限元
拉伸试验
涂层
应变隔离垫
Insulation tile
Finite element analysis
Tensile test
Coating with the high emittance
Strain isolation pad
