基于数字图像相关方法的气凝胶复合材料各向异性热变形测量

发布时间：2018-03-05 05:31

本文选题：气凝胶复合材料　切入点：数字图像相关方法　出处：《复合材料学报》2017年09期 　论文类型：期刊论文

【摘要】：在热防护材料及结构高温力学性能研究中,测量其在热载荷与机械载荷作用下产生的变形是重要且基础的工作。基于数字图像相关方法,建立了可实现800℃变形测量的非接触式测量系统。针对陶瓷纤维增强SiO_2气凝胶复合材料,从面外和面内两个材料方向,以25℃为参考温度,试验测量了材料加热至300~800℃范围内不同温度时产生的热变形。研究结果表明,在此试验系统基础上的变形测量方法可用来测量此类热防护材料的高温变形。陶瓷纤维增强SiO2气凝胶复合材料的高温热变形具有明显的各向异性,面外方向上表现为"收缩",面内方向上表现为"膨胀"。SiO_2气凝胶基体中的颗粒团聚以及增强纤维在面内方向上的铺层分布是导致热变形各向异性的主要原因。
[Abstract]:In the study of thermal protection materials and structure of high temperature mechanical properties, the measurement of thermal load and mechanical load deformation is an important and basic work. Based on digital image correlation method, a non-contact measurement system can realize the measurement of deformation of 800 DEG C. For the ceramic fiber reinforced SiO_2 aerogels composites, from two materials out of plane and in-plane direction, to 25 degrees as the reference temperature, which was measured at different temperature material is heated to 300~800 Deg. C during hot deformation. The results show that the high temperature deformation measurement method based on the test system can be used to measure the thermal protection materials has obvious anisotropy deformation. The hot deformation of SiO2 aerogel composites reinforced by ceramic fibers, plane direction is shown as "shrinkage", in-plane direction shows "expansion".SiO_2 aerogel matrix particle agglomeration in The main reason for the anisotropy of thermal deformation is the distribution of the reinforced fiber in the direction of the surface.

【作者单位】：北京航空航天大学能源与动力工程学院;北京空天技术研究所;先进航空发动机协同创新中心;
【分类号】：TB332

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