Compressive response of notched glass-fiber epoxy/honeycomb sandwich panels
Compressive response of notched glass-fiber epoxy/honeycomb sandwich panels
The quasi-static uniaxial compressive response of E-glass/epoxy-Nomex™ sandwich panels containing circular through-holes was studied experimentally. Specimens with four and eight-harness satin weave fabric face-sheets were tested. In both materials the principal failure mechanism consisted of linear damage zones (LDZs) emanating from the hole edge. LDZs are macroscopically similar to fiber-bridged cracks in tension, and propagated in a stable manner. Cross-sectioning indicated that the LDZ wake was characterized by fiber-kinking in all warp tows, and weft tow cracking. Strain gauges were used to measure local deformation as the LDZ propagated across the width of the specimen; a strain-softening behavior was observed in the LDZ wake.
A damage zone model (DZM) was applied in order to determine its validity and mechanistic basis. This was assessed by examining its ability to predict three experimentally observed phenomena: the notched strength, local strain distribution, and LDZ growth characteristics. Two models were created in order to interrogate the DZM. The damage growth model was used to determine the ability of the DZM to predict the LDZ growth behavior and notched strength. A finite element model was implemented to predict the local strain distribution. In both cases discrete nonlinear springs acting in the wake of an equivalent crack were used to model the LDZ. This approach provided a good correlation with whichever set of measurements was used to calibrate it. Extension of the model to the other phenomena resulted in weaker correlations with the data, suggesting that further work is required to develop a true mechanism-based model.
glass fibres, transverse cracking, damage mechanics
859-870
Toribio, M.G.
7107eb3f-1335-4022-a616-704662236390
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
2001
Toribio, M.G.
7107eb3f-1335-4022-a616-704662236390
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
Toribio, M.G. and Spearing, S.M.
(2001)
Compressive response of notched glass-fiber epoxy/honeycomb sandwich panels.
Composites Part A: Applied Science and Manufacturing, 32 (6), .
(doi:10.1016/S1359-835X(00)00150-0).
Abstract
The quasi-static uniaxial compressive response of E-glass/epoxy-Nomex™ sandwich panels containing circular through-holes was studied experimentally. Specimens with four and eight-harness satin weave fabric face-sheets were tested. In both materials the principal failure mechanism consisted of linear damage zones (LDZs) emanating from the hole edge. LDZs are macroscopically similar to fiber-bridged cracks in tension, and propagated in a stable manner. Cross-sectioning indicated that the LDZ wake was characterized by fiber-kinking in all warp tows, and weft tow cracking. Strain gauges were used to measure local deformation as the LDZ propagated across the width of the specimen; a strain-softening behavior was observed in the LDZ wake.
A damage zone model (DZM) was applied in order to determine its validity and mechanistic basis. This was assessed by examining its ability to predict three experimentally observed phenomena: the notched strength, local strain distribution, and LDZ growth characteristics. Two models were created in order to interrogate the DZM. The damage growth model was used to determine the ability of the DZM to predict the LDZ growth behavior and notched strength. A finite element model was implemented to predict the local strain distribution. In both cases discrete nonlinear springs acting in the wake of an equivalent crack were used to model the LDZ. This approach provided a good correlation with whichever set of measurements was used to calibrate it. Extension of the model to the other phenomena resulted in weaker correlations with the data, suggesting that further work is required to develop a true mechanism-based model.
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Published date: 2001
Keywords:
glass fibres, transverse cracking, damage mechanics
Identifiers
Local EPrints ID: 23081
URI: http://eprints.soton.ac.uk/id/eprint/23081
ISSN: 1359-835X
PURE UUID: 80c1a422-d9ad-45a7-87ed-3bf2cf3adf79
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Date deposited: 10 Mar 2006
Last modified: 16 Mar 2024 03:37
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Author:
M.G. Toribio
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