Abstract
This paper presents a damage-based failure criterion and its implementation in order to predict failure in ceramic matrix composites (CMC) manufactured via filament winding. The material behavior of CMCs is anisotropic and strongly depends on the angle between fiber orientation and loading direction. The inelastic behavior of laminates with different fiber orientations under tension and shear is modeled with the help of continuum damage mechanics. The parameters required for the damage model are obtained from a standard tensile and shear test. An isotropic damage law determines the evolution of damage in thermodynamic space and considers the interaction of damage parameters in different principal material directions. A quadratic damage-based failure criterion inspired by the Tsai-Wu failure criterion is proposed. Failure stress and strain can be predicted with higher accuracy compared to the Tsai-Wu failure criterion in stress- or strain-space. The use of the proposed damage limits allows designing a CMC component based on the microstructural phenomenon of stiffness loss. With the help of results obtained from modeling and experiments, fracture mechanics during the Iosipescu-shear test of CMCs and its capability to determine the shear strength of the material is discussed.
Highlights
Continuous fiber reinforced ceramic matrix composites (CMC) are being used in many fields, such as aeronautical, aerospace and automobile, because of their excellent thermomechanical properties at high temperatures and relatively low density when compared to their metallic counterparts [1,2,3,4,5]
Two CMC materials are investigated in the current work which are manufactured via filament winding at different facilities of German Aerospace Centre (DLR): C/C–silicon carbide (SiC) and WHIPOXTM
Both the materials were manufactured via filament winding, the mechanisms resulting in non-linearity in the materials are different due to their particular microstructures
Summary
Continuous fiber reinforced ceramic matrix composites (CMC) are being used in many fields, such as aeronautical, aerospace and automobile, because of their excellent thermomechanical properties at high temperatures and relatively low density when compared to their metallic counterparts [1,2,3,4,5]. Filament winding technology is one of the preforming methods which is employed to manufacture CMCs with rotational symmetry axis and application-tailored fiber orientation [6,7] Two such CMCs that are manufactured at German Aerospace Centre (DLR) are C/C–SiC (Institute of Structures and Design) and WHIPOXTM (Institute of Materials Research) via filament winding. Models describing the damage of a homogenous CMC material at the macro-level have been a topic of investigation for many researchers [14,15,16,17,18]. These models describe damage as the degradation of stiffness in principal material directions as the load increases. Apart from that, testing norms for CMCs already exist for these required tests
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