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Influence of reinforcement morphology on the mechanical properties of short-fiber composites

Description: A major problem of short-fiber composites is that the interfaces between the fiber and matrix become a limiting factor in improving mechanical properties such as strength. For a short fiber, a strong interface is desired to effectively transfer load from matrix to fiber, thus reducing the ineffective fiber length. However, a strong interface will make it difficult to relieve fiber stress concentration in front of an approaching crack. Stress concentrations result in fiber breakage. The authors … more
Date: December 1, 1997
Creator: Zhu, Y. T.; Valdez, J. A.; Shi, N.; Lovato, M. L.; Stout, M. G.; Zhou, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle shape effects on the fracture of discontinuously-reinforced 6061-A1 matrix composites

Description: Effects on fracture and ductility of a spherical and an angular particulate-reinforced 6061-Al composite containing 20(vol)% Al{sub 2}O{sub 3} were studied using SEM fractography and modeled using finite element method (FEM). The spherical particulate composite exhibited a slightly lower yield strength and work hardening rate but a considerably higher ductility than the angular counterpart. SEM fractography showed that during tensile deformation the spherical composite failed through void nucle… more
Date: May 1, 1996
Creator: Shi, N.; Song, S. G.; Gray, G. T., III & Roberts, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Bauschinger effect in a SiC/Al composite

Description: SiC/Al composites have interesting mechanical properties, the tensile yield stress, whereas, the apparent modulus in tension is greater than that in compression. The Bauschinger effect of SiC/Al composites is also asymmetric with regard to loading directions. Quantitative measurements of the asymmetry of composite Bauschinger Effect was made in this research . An investigation was undertaken to determine the origin of the asymmetrical Bauschinger effect. We have successfully reconstructed the o… more
Date: September 1, 1995
Creator: Shi, N.; Pillai, U.T.S. & Arsenault, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stress relaxation in discontinuously reinforced composites

Description: It has been observed that in discontinuously-reinforced Al{sub 2}0{sub 3}/NiAl composites that as the reinforcement size increases the average density of dislocations generated from the relaxation of the thermal stresses increases, and the corresponding thermal residual stresses slightly decrease. Similar changes result when the reinforcement morphology changes from spheres to short fibers to continuous filaments. The changes of dislocation density and thermal residual stresses with respect to … more
Date: May 1, 1995
Creator: Shi, N. & Arsenault, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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