7. INTERFACIAL BONDING 7.1 Fundamental Concept The matrix and fiber/matrix interaction can have a significant effect on crack propagation in the composite. If the matrix shear strength and modulus and the fiber/matrix bond strength are too high, a cr
HW1: due 1/26/06
A. Given a square composite laminate having a stacking sequence of [302/-303], draw the
deformed shape of the laminate if it is subjected to (a) uniaxial tension along 0odirection, (b) bending with respect to 0o-direction and (c) a temper
MSE/ME426
Midterm (2/28/06)
NAME_
1. A composite material is made of glass fibers and an epoxy matrix. If the curing temperature is 150oC and the service temperature is -50oC, find the axial thermal residual stress in each constituent in service c
10. COMPOSITES
10.1 General Guidelines
A. In reinforcing a matrix, stiff and strong bers are used as reinforcing materials.
Rubbermodied polymers and metal/ ceramic composites in which the reinforcing
materials are softer than the matrices are very few
Theory of Anisotropy
l.
The Hookes law for three-dimensional anisotropic materials:
a. : C We where CW is called stiffness matrix and may be a 9X9 matrix
51.] = SWUk, where SW is called compliance matrix and may be a 9x9 matrix
where i,j, k, 1:1, 2,3
6. MATRICES 6.1 Function of Matrix A. Bind the fibers together to become a fiber tow. B. Separate the individual fibers to promote the wetting capability. C. Protect the fibers from rubbing one another and being damaged through contact and friction.
5.1 Why Use Fibers? When subjected to any loading, particulate composites experience high stress concentrations around the reinforcing particles and result in poor strengths to the composites. However, unidirectional fiber-reinforced composite materi