Delayed Yielding of Three-Phase Epoxy Composites

by Leslie Cohen, (A.M.ASCE), Struct. Res. Branch, Advance Structures and Mech. Dept., McDonnell Douglas Astronautics Co.—Western Div., Huntington Beach, CA,
Ori Ishai, Dept. of Mech., The Technion, Israel Inst. of Technol., Haifa, Israel; formerly, Visiting Res. Assoc., Materials Res. Lab., Washington Univ., St. Louis, MO,


Serial Information: Journal of the Engineering Mechanics Division, 1970, Vol. 96, Issue 6, Pg. 867-876


Document Type: Journal Paper

Abstract: A three-phase particulate composite, consisting of filler and voids within a matrix, was tested in compression up to yield under several constant strain rates. The volumetric filler and void content ranges to 39% and 52%, respectively, and the strain rates were within three decades. The results yield a linear relationship between yield stress and log strain rate over the range of filler and void content considered in the three-phase system. A relationship is presented for the yield stress of the three-phase system as a function of filler and void content and strain rate. The suggested approach uses results from a previous study conducted by the writers concerning the yielding of two-phase filled and porous composites.

Subject Headings: Voids | Strain rates | Composite materials | Stress strain relations | Yield stress | Matrix (mathematics) | Compression tests

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