Modeling of Mechanical Response and Progressive Failure of Tri-axially Woven SiCf-SiC Composites
Effective properties and progressive failure of SiC matrix composites reinforced by tri-axially woven SiC fibers (SiCf) (as a fabric) are predicted.Three different orientations of the woven fabric are considered in geometrical modeling,including -60°-0°-60°,-55°-0°-55° and -45°-0°-45°.Three- dimensional unit cells with the matrix reinforced by the fabrics in such orientations are constructed and used.Homogenization analyses are carried out using the finite element method (FEM).It is found that the -60°-0°-60° fabric orientation provides the highest values for the effective elastic moduli,while the -45°-0°-45° orientation gives the lowest values.The effective properties obtained are then used to conduct a progressive failure analysis of the SiCf-SiC composite subjected to uni-axial tensile loading.The progressive failure analysis incorporates both geometrical and material non-linearities,and describes the progressive damage induced by crack initiation and propagation through a material degradation model.The Tsai-Wu failure criterion is used,and a two-parameter Weibull distribution is employed to account for the changes in strength with increasing specimen volume.Based on this progressive failure analysis,stress-strain curves for the SiCf-SiC composites are plotted,and the -60°-0°-60° orientation is found to have the smallest deformations at given loads.
Woven composite Effective property Homogenization Progressive failure analysis SiCf-SiC
S.G.Kulkarni X.-L.Gao
Department of Mechanical Engineering,Texas A&M University,College Station,TX 77843 Department of Mechanical Engineering,University of Texas at Dallas,Richardson,TX 75080-3021
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）