Failure mechanisms of laminated carbon-carbon composites; 1: Under uniaxial compression
- Dartmouth Coll., Hanover, NH (United States). Thayer School of Engineering
Failure mechanisms under uniaxial compressive loading are determined for several types of two dimensional (2D) carbon-carbon composites. Compressive strengths ranging from 90 to 180 MPa are observed. As expected, under uniaxial compression, a shear band is formed across the specimen diagonal. Remarkably, no inelastic deformation, either in the form of micro-buckling or microcrack nucleation was observed prior to the terminal shear failure. The crimp angles associated with the weaving pattern are significant not only in pre-setting the angle of the shear band but also in regard to the local kink boundary angle [beta] in the fiber bundles. Hitherto unreported values of [beta] ranging from 50--60[degree], and the kink inclination angle [alpha] in the range 35--40 [degree], are observed. A theoretical analysis relating the peak compression load to [alpha] and [beta], with crimp angles as initial imperfections, explains the experimental observations.
- OSTI ID:
- 5120556
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:3; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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