Mechanism-based strength criterion for 3D needled C/C–SiC composites under in-plane biaxial compression. Issue 22 (17th November 2019)

• Record Type: Journal Article
• Authors: Chen, Zhen; Fang, Guodong; Xie, Junbo; Liang, Jun
• Is Part Of: Mechanics of advanced materials and structures. Volume 26:Issue 22(2019)
• Page Start: 1841
• Page End: 1848
• Publication Date: 2019-11-17
• Subjects: Needled composites -- biaxial testing -- failure mechanisms -- failure shear plane -- strength criterion; Composite materials -- Mechanical properties -- Periodicals; Composite construction -- Periodicals; 620.118
• DOI: 10.1080/15376494.2018.1452316
• Languages: English
• ISSNs: 1537-6494

Abstract

ABSTRACT: Biaxial compressive experiments for 3D needled C/C–SiC composites parallel to the nonwoven cloth were conducted. The failure mechanisms and mechanical properties of the composites were greatly related to the biaxial compressive stress confinement ratio, R . It was found that out-of-plane shear failure controlled the failure of the composites. The failure shear plane was aligned with one of the major loading axes for R (0:1 or 1:3), while the failure shear plane occurred along both loading axes for R (1:2 or 1:1). Compared with uniaxial strength, the biaxial compressive strength increased obviously, which also significantly depended on the value of R . Based on the failure modes, a modified twin-shear strength criterion was established to predict the failure surface of 3D needled C/C–SiC composites under biaxial compressive loading.