The Effect Of Braid Angle On The Dynamic
Response Of 3-D Four Direction Carbon/epoxy
Braid Composites At High Strain Rates
Author(s)
Z. H. Tan, B. Jia, B. J. Pang & B. Z. Gai
Abstract
In this paper, the compressive properties of two different braid angles of 150 and
300 of 3-D four-direction braid carbon/epoxy composites have been investigated
to evaluate the compressive failure mode at different strain rates by using the
split Hopkinson pressure bar (SHPB). Samples with different braid angles were
subjected to a high strain rate compression loading at strain rates, ranging from
almost 500/s to 2000/s. A copper disk was selected to use as a pulse shaper to
ensure that the stress and strain in the specimen were uniform and deformed at a
nearly constant strain rate over most of the dynamic compression duration. The
effects of the strain rates and braid angles on peak stress and stiffness were
discussed in the study. The results indicated that composites with a braid angle
150 had larger peak stress and stiffness at high strain rates.
Keywords: SHPB, braid composite material, high strain rate, braid angle,
dynamic peak stress.
1 Introduction
A large number of the applications of composite materials involve dynamic
loading during their service life. Deformation and fracture of the composites
have received considerable attention. Further, development of a constitutive
equation for materials used in structures subjected to dynamic loading requires
the knowledge base of the variation in material strength with the applied rate of
loading and also how stress and strain rate are related [1, 2]. Hence, it is
necessary to characterize the composites’ dynamic response at high strain rates.
Keywords
SHPB, braid composite material, high strain rate, braid angle,
dynamic peak stress.
Related Book
Other papers in this volume
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