Bending behavior of lightweight C/SiC pyramidal lattice core sandwich panels. (1st April 2020)

• Record Type: Journal Article
• Authors: Zhang, Lu; Chen, Yanfei; He, Rujie; Bai, Xuejian; Zhang, Keqiang; Ai, Shigang; Yang, Yazheng; Fang, Daining
• Is Part Of: International journal of mechanical sciences. Volume 171(2020)
• Publication Date: 2020-04-01
• Subjects: C/SiC composite -- Pyramidal lattice core sandwich panel -- Bending behavior -- Finite element analysis; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2019.105409
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: C/SiC pyramidal LCSPs are designed and fabricated. Bending tests are conducted and bonds failure is commonly observed. The mechanism maps are constructed to determine the bending failure mode. FEA method is applied to study the bending response and failure behavior. Abstract: Due to the excellent mechanical and chemical properties at ultra-high temperature, ceramic matrix composite structures have potential applications for thermal protection systems of hypersonic vehicles. This paper presented a PIP method to fabricate C/SiC pyramidal lattice core sandwich panels (LCSPs). Their bending behaviors with different core angles were experimentally studied firstly. Then the critical failure loads of different failure modes, including facesheet crushing or wrinkling, core member crushing, core shear failure and interlayer delamination, were theoretically established to construct the failure mechanism maps. The influence of geometric parameters, such as the length and the core angle of the core strut, and the thickness of the facesheet, on the failure mode was also analyzed. In addition, further failure process under bending load was investigated by finite element analysis (FEA) method. Elastic-damage constitutive model and cohesive element were applied to modeling the behavior of C/SiC composite and interlayer delamination between the sheet of the core and the facesheet. Theoretical and FEA results agreed well with experimental data. This work is believed to be helpful to understand the bending mechanism C/SiC pyramidal LCSPs. Graphical abstract: Image, graphical abstract