Effect of Suture on Mechanical Properties of Stitched Thermal Protection Sandwich

This paper investigates the tensile properties and bending performances of stitched thermal protection structure in engineering, and the effect of stitching density on mechanical properties, via a model of ceramic-aerogel stitched sandwich. With the help of ANSYS, titanium alloy bottom plate was added to the bottom surface of the thermal protection structure, which was regarded as the protected body, and the two were synergistically deformed. The validity of the entire model was verified. The distribution of stress field inside the structure was determined by substructure precise analysis method and the law of the finite element solution was given. The results show that interlaminar performance of the stitched sandwich is improved by 30% on average under tensile or four-point bending conditions.

本文以陶瓷气凝胶缝合夹层结构为研究模型，针对工程应用中的缝合式热防护结构的拉伸性能、弯曲性能以及缝合密度对其力学性能的影响展开研究。借助ANSYS软件，本文在热防护结构的底面增设钛合金底板并将其视为被防护体，使二者协同变形；验证了整体模型的有效性。通过子结构精确分析法确定了结构内部的应力场分布，并给出了有限元求解规律。研究结果表明，在拉伸或四点弯曲工况下，缝合夹层结构的层间性能平均提升30%。