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Determination of interlaminar residual thermal stresses in a woven 8HS graphite/PMR-15 composite using X-ray diffraction measurements

Benedikt, B. ; Rupnowski, P. ; Kumosa, L. LU ; Sutter, J. K. ; Predecki, P. K. and Kumosa, M. (2002) In Mechanics of Advanced Materials and Structures 9(4). p.375-394
Abstract

This work is a continuation of the research recently presented in [1] and [2] on the determination of residual thermal stresses in graphite/polyimide composites with and without externally applied bending loads. In the previous work [1, 2] a combined experimental and numerical methodology for the determination of the residual stresses in unidirectional graphite/PMR-15 composites based on X-ray diffraction (XRD) measurements of residual strains in embedded aluminum (Al) and silver (Ag) inclusions has been presented. In this research, the previously developed approach has been applied to evaluate the residual thermal interlaminar stresses in an 8 harness satin (8HS) woven graphite/PMR-15 composite. First, residual thermal stresses have... (More)

This work is a continuation of the research recently presented in [1] and [2] on the determination of residual thermal stresses in graphite/polyimide composites with and without externally applied bending loads. In the previous work [1, 2] a combined experimental and numerical methodology for the determination of the residual stresses in unidirectional graphite/PMR-15 composites based on X-ray diffraction (XRD) measurements of residual strains in embedded aluminum (Al) and silver (Ag) inclusions has been presented. In this research, the previously developed approach has been applied to evaluate the residual thermal interlaminar stresses in an 8 harness satin (8HS) woven graphite/PMR-15 composite. First, residual thermal stresses have been measured by XRD in aluminum inclusions embedded between the first and second plies of a four-ply 8HS woven graphite/PMR-15 composite. The measurements have been conducted with the composite specimens subjected to four-point bending deformations. Second, viscoelastic computations of interlaminar residual stresses in the composite have been performed using classical laminated plate theory (CLPT) following the manufacturing procedure. Third, the residual strains and stresses in the inclusions have been numerically predicted using the viscoelastic Eshelby model for multiple spherical inclusions. Finally, the interlaminar residual stresses in the composite have been extracted from the XRD strains in the Al inclusions, again using the viscoelastic Eshelby model, and subsequently compared with the residual stresses from the CLPT. It has been shown in this study that the residual interlaminar thermal stresses can be accurately determined not only in unidirectional graphite/polyimide systems as presented in [1] and [2], but also in woven graphite polymer matrix composites.

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publishing date
type
Contribution to journal
publication status
published
in
Mechanics of Advanced Materials and Structures
volume
9
issue
4
pages
375 - 394
publisher
Taylor & Francis
external identifiers
  • scopus:0012706695
ISSN
1537-6494
DOI
10.1080/15376490290097026
language
English
LU publication?
no
id
32bf8ea6-7c98-4057-ab9a-2f93da4ca11b
date added to LUP
2022-11-26 13:36:47
date last changed
2022-11-28 09:33:51
@article{32bf8ea6-7c98-4057-ab9a-2f93da4ca11b,
  abstract     = {{<p>This work is a continuation of the research recently presented in [1] and [2] on the determination of residual thermal stresses in graphite/polyimide composites with and without externally applied bending loads. In the previous work [1, 2] a combined experimental and numerical methodology for the determination of the residual stresses in unidirectional graphite/PMR-15 composites based on X-ray diffraction (XRD) measurements of residual strains in embedded aluminum (Al) and silver (Ag) inclusions has been presented. In this research, the previously developed approach has been applied to evaluate the residual thermal interlaminar stresses in an 8 harness satin (8HS) woven graphite/PMR-15 composite. First, residual thermal stresses have been measured by XRD in aluminum inclusions embedded between the first and second plies of a four-ply 8HS woven graphite/PMR-15 composite. The measurements have been conducted with the composite specimens subjected to four-point bending deformations. Second, viscoelastic computations of interlaminar residual stresses in the composite have been performed using classical laminated plate theory (CLPT) following the manufacturing procedure. Third, the residual strains and stresses in the inclusions have been numerically predicted using the viscoelastic Eshelby model for multiple spherical inclusions. Finally, the interlaminar residual stresses in the composite have been extracted from the XRD strains in the Al inclusions, again using the viscoelastic Eshelby model, and subsequently compared with the residual stresses from the CLPT. It has been shown in this study that the residual interlaminar thermal stresses can be accurately determined not only in unidirectional graphite/polyimide systems as presented in [1] and [2], but also in woven graphite polymer matrix composites.</p>}},
  author       = {{Benedikt, B. and Rupnowski, P. and Kumosa, L. and Sutter, J. K. and Predecki, P. K. and Kumosa, M.}},
  issn         = {{1537-6494}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{375--394}},
  publisher    = {{Taylor & Francis}},
  series       = {{Mechanics of Advanced Materials and Structures}},
  title        = {{Determination of interlaminar residual thermal stresses in a woven 8HS graphite/PMR-15 composite using X-ray diffraction measurements}},
  url          = {{http://dx.doi.org/10.1080/15376490290097026}},
  doi          = {{10.1080/15376490290097026}},
  volume       = {{9}},
  year         = {{2002}},
}