A Curved Beam Test Specimen for Determining The Interlaminar Tensile Strength of a Laminated Composite

Hiel, C.; Sumich, Mark; Chappell, David P.

doi:10.1007/978-94-011-3856-7_22

Cited by 10 publications

(16 citation statements)

References 6 publications

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“…For both, specimens with cut plies, acting as crack starters, and without cut-plies, the specimens failed in similar fashion to the elliptical specimens tested by Hiel et al [9]. Expectedly, the cut-ply specimens failed at lower load levels than the pristine specimens as shown in Fig.…”

Section: Figure 1: Humpback Bridge Specimensupporting

confidence: 68%

“…There have only been a few attempts to identifying the onset of delamination under fatigue loading on a physical basis rather than the phenomenological approaches described above. Hiel et al [9] performed fatigue tests on elliptical specimens made from T300/934 carbon/epoxy. Under both quasi-static and fatigue loading these specimens failed by sudden mode I delamination.…”

Section: Introductionmentioning

confidence: 99%

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Damage initiation in polymer matrix composites under high-cycle fatigue loading – A question of definition or a material property?

May

Hallett

2016

International Journal of Fatigue

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Damage initiation in composites under high-cycle fatigue loading is often defined by the presence of a crack of detectable size. This article is intended to assess if damage initiation under cyclic loading can also be described in a more physical way. In order to achieve this, SN-curves for fatigue damage initiation are normalized by dividing the maximum stress per load cycle by the static strength. By presenting normalized fatigue damage initiation data, the influence of specimen geometry, test setup and fiber type can be eliminated. The normalized presentation of the experimental data suggests that fatigue damage initiation in composites subjected to highcycle fatigue loading may indeed be a material property of the resin which can be described by a normalized SNcurve.

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Section: Figure 1: Humpback Bridge Specimensupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Damage initiation in polymer matrix composites under high-cycle fatigue loading – A question of definition or a material property?

May

Hallett

2016

International Journal of Fatigue

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“…These stresses may be closely related to fracture because it coincides with the direction in which properties are matrix dominated. An expression for the maximum radial tensile stress err is found in [11] and given by:…”

Section: Analytical Evaluation Of Bending Stressesmentioning

confidence: 99%

Folding of continuous fibre thermoplastic composites

1997

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Abstract. Thermoplastic composites with continuous fibres are attractive construction materials because of their good specific mechanical properties and their possibility to be processed very rapidly. An extremely fast processing method is folding of sheet material. Folding can be performed by local heating of a sheet along a line. Heating is done to a temperature, well above the softening or melting point of the thermoplastic polymer. Subsequent folding along the heated line requires very low forces. The folded geometry becomes permanent after cooling below the softening point of the polymer. Unfortunately, folding causes microbuckling of the reinforcing fibres at the compression side of the fold causing a severe reduction in the local strength. The present report describes a method for the folding of thermoplastic composites, which controls the direction of fibre microbuckling. The method results in a smaller strength reduction.The folding equipment is designed in such a way that microbuckling of the fibres occurs in a direction in the local plane of the sheet rather than being perpendicular to that plane. The result is a folded sheet with a reduction of about half of the original strength, as compared to a strength of only 15% of the original strength, which is typical for folds produced with more conventional means. In other words, the remaining strength is more then doubled using the new folding technology.

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“…Kedward et al (1989) proposed a simple strength of materials approach that successfully estimates the maximum interlaminar stresses of delamination failure. Jackson (1989, 1990) and Hiel et al (1991) proposed several specimen geometries to study the delamination problem in other types of curved thick composite laminates. In the early 1990's, Martin and Jackson (1991) and Martin (1992) carried out experimental and numerical investigation of the failure of L-shaped composite laminates under shear loading case, V (Fig.…”

Section: Introductionmentioning

confidence: 99%

Intersonic delamination in curved thick composite laminates under quasi-static loading

Gözlüklü

Uyar

Çöker

2015

Mechanics of Materials

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A Curved Beam Test Specimen for Determining The Interlaminar Tensile Strength of a Laminated Composite

Cited by 10 publications

References 6 publications

Damage initiation in polymer matrix composites under high-cycle fatigue loading – A question of definition or a material property?

Damage initiation in polymer matrix composites under high-cycle fatigue loading – A question of definition or a material property?

Folding of continuous fibre thermoplastic composites

Intersonic delamination in curved thick composite laminates under quasi-static loading

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