Metal matrix composites microfracture: Computational simulation

• Published in: Computers & structures Vol. 37; no. 2; pp. 141 - 150
• Main Authors: Mital, S.K., Caruso, J.J., Chamis, C.C.
• Format: Journal Article
• Language: English
• Published: Legacy CDMS Elsevier Ltd 1990
• Subjects: Composite Materials
• ISSN: 0045-7949; 1879-2243
• DOI: 10.1016/0045-7949(90)90395-I

Fiber/matrix fracture and fiber-matrix interface debonding in a metal matrix composite (MMC) are computationally simulated. These simulations are part of a research activity to develop computational methods for microfracture, microfracture propagation and fracture toughness of metal matrix composites. The three-dimensional finite element model used in the simulation consists of a group of nine unidirectional fibers in a three by three unit cell array of SiC/Ti15 metal matrix composite with a fiber volume ratio of 0.35. This computational procedure is used to predict the direction of crack growth based on strain energy release rate. It is also used to predict stress redistribution to surrounding matrix/ fibers due to initial and progressive fracture of fiber/matrix and due to debonding of the fiber-matrix interface. Microfracture results for various loading cases such as longitudinal, transverse, shear and bending are presented and discussed. Step-by-step procedures are outlined to evaluate composite microfracture for a given composite system.