Unidirectional Composite Compression Strengths Obtained by Testing Cross-Ply Laminates

Johnson, WS; Masters, JE; Wilson, David G.; Welsh, JS; Adams, DF

doi:10.1520/ctr10109j

Cited by 17 publications

(2 citation statements)

References 8 publications

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“…Because of these issues, the extraction of longitudinal ply properties from multidirectional (MD) or cross-ply (CP) laminates, using classical lamination theory (CLT) has been suggested as a more viable alternative [6,10,11]. However, previous experimental studies have always shown significant differences between the strength measurements obtained from UD and MD laminates.…”

Section: Introductionmentioning

confidence: 99%

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A study on the longitudinal compression strength of fibre reinforced composites under uniaxial and off-axis loads using cross-ply laminate specimens

Thomson

Cui

Erice

et al. 2019

Composites Part A: Applied Science and Manufacturing

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Longitudinal compression testing of unidirectional FRP laminates remains a challenge due to the difficulty in applying high compressive loads without stress concentrations and boundary effects leading to premature failure. This work aims to critically evaluate different specimen designs and laminate configurations, cross-ply in particular, for the determination of longitudinal compression properties of unidirectional plies. To this end, a comprehensive experimental campaign has been carried out, comparing strength, stiffness, and failure modes across different specimen designs and laminate configurations. The investigated cross-ply specimens produced comparable results without many of the issues observed in the testing unidirectional material and, therefore, are strongly recommended for the determination of longitudinal compressive strength. Finally, the cross-ply material was tested under off-axis compression to study the effects of shear on the longitudinal compression strength using a series of compression specimens cut at different angles between 0 and 15° to the direction of the laminate.

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Section: Introductionmentioning

confidence: 99%

“…For the IM7-8552 material, for example, Lee and Soutis [6] and Ploeckl et al [7] reported strength measurements from quasi-isotropic (QI) around 20% higher than the UD material. The use of CP laminates was also explored in the 1990s [10] and higher strengths than the plain UD material were again observed.…”

Section: Introductionmentioning

confidence: 99%

A study on the longitudinal compression strength of fibre reinforced composites under uniaxial and off-axis loads using cross-ply laminate specimens

Thomson

Cui

Erice

et al. 2019

Composites Part A: Applied Science and Manufacturing

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Compression Properties of Fibers and Polymer Composites

Piggott

2011

Wiley Encyclopedia of Composites

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The factors controlling the compressive strength and modulus are reviewed. These are the initial straightness of the fibers in the laminate, the compressive strength of the fibers, and the matrix compression properties (yield strength, modulus, etc.). The most recent and reliable compression testing methods are described and the sources of compressive strength and stiffness are discussed. The compressive strengths and stiffnesses of carbon, glass, and aramid laminates are then summarized.

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Compression behavior of woven glass/epoxy specimens using a new end‐loaded hybrid specimen

et al. 2011

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A new compression specimen was applied to woven glass/epoxy laminates. The specimen consists of epoxy layers cast on the sides of the laminate to prevent buckling. Thin-sheet aluminum ends enable alignment and avoid crushing under end loading, which does not require any special fixture. The compression stress-strain behavior of the laminate was obtained from the specimens by discounting the previously measured stress-strain curve of the epoxy backings. Despite the higher scatter in compression tests, the average modulus was practically identical to the tensile modulus. Moreover, failure occurred away from the ends in nearly all of the specimens tested. The average compressive strength was 84% of the tensile strength and consistent with the flexural strength measured in four-point bending tests. The present compression specimen could, therefore, become an interesting alternative to the more elaborate standard test methods available. Nevertheless, this new compression testing approach needs further evaluation involving application to other materials. POLYM. COMPOS., 32:491-496, 2011. ª

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Unidirectional Composite Compression Strengths Obtained by Testing Cross-Ply Laminates

Cited by 17 publications

References 8 publications

A study on the longitudinal compression strength of fibre reinforced composites under uniaxial and off-axis loads using cross-ply laminate specimens

A study on the longitudinal compression strength of fibre reinforced composites under uniaxial and off-axis loads using cross-ply laminate specimens

Compression Properties of Fibers and Polymer Composites

Compression behavior of woven glass/epoxy specimens using a new end‐loaded hybrid specimen

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