A Simplified Method of Determining the Inplane Shear Stress-Strain Response of Unidirectional Composites

Petit, Philippe

doi:10.1520/stp49808s

Cited by 44 publications

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“…Simultaneous recording of the applied load and the strain enables one to determine the shear stress-strain relationship of the specimen. Tensile test on a t4S0 symmetric laminate for determining the in-plane properties of the FRPC was first proposed by Petit (1969). The method was later improved by Rosen (1972).…”

Section: Tensile Test On 145' Symmetric Laminate (Astm D3518-94)mentioning

confidence: 99%

A New Test Method for Measuring the Longitudinal and Shear Moduli of Fiber Reinforced Composites

Jalali¹,

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

1999

Journal of Composite Materials

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A new test method for the simultaneous evaluation of the longitudinal and the shear moduli of fiber reinforced plastic composites (FRPC) is introduced. Under the proposed method, specimens with different span to depth ratios (Llh) are subjected to three-point bending. Therefore, we name the method the "Varying Span Method" (VSM). The method builds on the inherent low shear modulus characteristics of FRPC. This characteristic leads to a flexural modulus which is a function of LMh. Eliminating the effect of local deformation from the test results, the flexural modulus (beside the geometry of the specimen) is a function of the longitudinal and the through-the-thickness shear moduli. These moduli can be obtained from the results of at least two tests on specimens with different Llh. For this, two distinctly different theories are introduced. A special apparatus is used to eliminate the effect of local deformations. The factors that may affect the accuracy and efficiency of the results are investigated and discussed. The validity of the proposed method is demonstrated by theoretical and experimental evaluations. The moduli of graphite/epoxy and Kevlar/epoxy composites, as measured by VSM, are reported. The measured values were found to be in very good agreement with the values evaluated by other standard methods.

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Section: Tensile Test On 145' Symmetric Laminate (Astm D3518-94)mentioning

confidence: 99%

A New Test Method for Measuring the Longitudinal and Shear Moduli of Fiber Reinforced Composites

Jalali¹,

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

1999

Journal of Composite Materials

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“…Hence, the relative displacement, W M rel , due to bending-twisting of any point located in the load application line, 1 2 , y 0 , to the middle point of the specimen, 1 2 , 1 2 , is derived:…”

Section: Displacement Eld For the Load Application Linementioning

confidence: 99%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 The displacement of the middle point of the specimen, 1 2 , 1 2 , is…”

Section: Verication Of the Load Application Cylinder Line Displacementmentioning

confidence: 99%

“…Therefore for the 3-point o-axis bending test two span-to-width ratio conditions are required: (1) and c > c mid (29).…”

Section: Verication Of the Load Application Cylinder Line Displacementmentioning

confidence: 99%

“…The [±45 • ] 2s tensile test: proposed by Petit [1], simplied by Rosen [2], and described in ASTM D3518 standard [3].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the validity of the three-point off-axis bending method

Cabrero

Vargas

2015

Applied Mathematical Modelling

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Please cite this article as: J.M. Cabrero, G. Vargas, Analysis of the validity of the three-point off-axis bending method, Appl. Math. Modelling (2015), doi: http://dx.Abstract Several methods for determining in-plane shear properties of anisotropic materials (i.e. bre reinforced composite materials and natural wood) based on exural loading have been proposed. One of those methods is the o-axis exural test that considers unidirectional composite materials subject to three-point bending loading. As a result of the anisotropic behaviour, unidirectional oaxis laminates subjected to exure present a bending-twisting coupling that may cause, in the case of 3-point bending loading, a lift-o of the specimen on the xture supports. Such specimen lift-o has been considered one of the critical features to be considered on the mentioned experimental method. Besides geometrical parameters, material elastic constants, as longitudinal, transversaland shear elastic moduli, inuence the validity to use this method for characterizing in-plane shear properties. On that sense, an analytical approach for studying the material conditions for which the application of the o-axis 3P-B test is adequate is presented.

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Characterization of Composite Properties at Different Temperatures

Liebisch

2024

Mechanics and Adaptronics

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A Simplified Method of Determining the Inplane Shear Stress-Strain Response of Unidirectional Composites

Cited by 44 publications

References 0 publications

A New Test Method for Measuring the Longitudinal and Shear Moduli of Fiber Reinforced Composites

A New Test Method for Measuring the Longitudinal and Shear Moduli of Fiber Reinforced Composites

Analysis of the validity of the three-point off-axis bending method

Characterization of Composite Properties at Different Temperatures

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