Testing of fiber composites at high strain ratesAn experimental investigation was conducted to determine strain rate effects in fiber composites. Unidirectional composite specimens of boron/epoxy, graphite/epoxy, S-glass/epoxy and Kevlar/epoxy were tested at tensile strain rates of up to 27 m/m/sec. Longitudinal, transverse and in-plane shear properties, including modulus, Poisson's ratio, strength and ultimate strain, were determined by testing 0-, 90and 10-degree unidirectional coupons. Strains were measured by means of strain gages bonded on the coupons and loads were measured by means of a strain gage load cell. All specimens were loaded in an electrohydraulic loading system. The 0-degree properties which are governed by the fibers do not vary much with strain rate except for the Kevlar/epoxy material which shows an increase in both modulus and strength. The strain rate effects on 90-degree properties were small with a general trend toward higher strength with increasing strain rate. The most noticeable effect was on in-plane shear properties with shear strength values at high strain rates approximately fifteen percent higher than static values.
Document ID
19790033025
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Daniel, I. M. (IIT Research Inst. Chicago, IL, United States)
Liber, T. (IIT Research Institute Chicago, Ill., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
Composite Materials
Meeting Information
Meeting: ICCM/2; Second International Conference on Composite Materials