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Comparison of the ± 45° tensile and iosipescu shear tests for woven fabric composite materials

Kumosa, M. ; Odegard, G. ; Armentrout, D. ; Kumosa, L. LU ; Searles, K. and Sutter, J. K. (2002) In Journal of Composites Technology and Research 24(1).
Abstract

The mechanical response of a woven eight-harness satin graphite/polyimide composite has been investigated by performing ± 45° tensile and Iosipescu shear tests at room temperature. Nonlinear finite element simulations of the tests have been conducted to determine internal stress distributions in the ±45° tensile and Iosipescu fabric specimens as a function of load. In the experimental part of this study, a series of tensile and Iosipescu shear tests have been performed. Acoustic emission techniques have been employed to monitor damage initiation and progression in the composite. The finite element computations have shown that the internal stress distributions in the Iosipescu and tensile fabric specimens are significantly different. In... (More)

The mechanical response of a woven eight-harness satin graphite/polyimide composite has been investigated by performing ± 45° tensile and Iosipescu shear tests at room temperature. Nonlinear finite element simulations of the tests have been conducted to determine internal stress distributions in the ±45° tensile and Iosipescu fabric specimens as a function of load. In the experimental part of this study, a series of tensile and Iosipescu shear tests have been performed. Acoustic emission techniques have been employed to monitor damage initiation and progression in the composite. The finite element computations have shown that the internal stress distributions in the Iosipescu and tensile fabric specimens are significantly different. In the gage sections of Iosipescu specimens, the state of stress is essentially pure shear, whereas the tensile tests generate biaxial stress conditions. It has been shown in this research that the shear strength of the composite determined from the maximum loads obtained from the Iosipescu shear tests is significantly higher than the shear strength obtained from the ± 45° tensile tests. Moreover, the initiation of intralaminar damage in the tensile specimens occurs at much lower loads than in the Iosipescu specimens. It appears that the ± 45° tensile test significantly underestimates the shear strength of the composite evaluated from the onset of intralaminar damage and the maximum loads.

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author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Iosipescu test, Woven carbon/PMR-15 composite, ± 45° tensile test
in
Journal of Composites Technology and Research
volume
24
issue
1
pages
14 pages
publisher
American Society for Testing and Materials
external identifiers
  • scopus:0036240508
ISSN
0884-6804
DOI
10.1520/ctr10892j
language
English
LU publication?
no
id
6ae7375a-e05d-4925-8885-89a0c5fe6141
date added to LUP
2022-11-26 13:36:00
date last changed
2022-11-28 09:31:18
@article{6ae7375a-e05d-4925-8885-89a0c5fe6141,
  abstract     = {{<p>The mechanical response of a woven eight-harness satin graphite/polyimide composite has been investigated by performing ± 45° tensile and Iosipescu shear tests at room temperature. Nonlinear finite element simulations of the tests have been conducted to determine internal stress distributions in the ±45° tensile and Iosipescu fabric specimens as a function of load. In the experimental part of this study, a series of tensile and Iosipescu shear tests have been performed. Acoustic emission techniques have been employed to monitor damage initiation and progression in the composite. The finite element computations have shown that the internal stress distributions in the Iosipescu and tensile fabric specimens are significantly different. In the gage sections of Iosipescu specimens, the state of stress is essentially pure shear, whereas the tensile tests generate biaxial stress conditions. It has been shown in this research that the shear strength of the composite determined from the maximum loads obtained from the Iosipescu shear tests is significantly higher than the shear strength obtained from the ± 45° tensile tests. Moreover, the initiation of intralaminar damage in the tensile specimens occurs at much lower loads than in the Iosipescu specimens. It appears that the ± 45° tensile test significantly underestimates the shear strength of the composite evaluated from the onset of intralaminar damage and the maximum loads.</p>}},
  author       = {{Kumosa, M. and Odegard, G. and Armentrout, D. and Kumosa, L. and Searles, K. and Sutter, J. K.}},
  issn         = {{0884-6804}},
  keywords     = {{Iosipescu test; Woven carbon/PMR-15 composite; ± 45° tensile test}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{American Society for Testing and Materials}},
  series       = {{Journal of Composites Technology and Research}},
  title        = {{Comparison of the ± 45° tensile and iosipescu shear tests for woven fabric composite materials}},
  url          = {{http://dx.doi.org/10.1520/ctr10892j}},
  doi          = {{10.1520/ctr10892j}},
  volume       = {{24}},
  year         = {{2002}},
}