Corrections for mode II fracture toughness specimens of composites materials

Wang, Y.; Williams, J. G.

doi:10.1016/0266-3538(92)90096-l

Cited by 229 publications

(94 citation statements)

References 6 publications

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“…Authors who modelled the ENF test within the theory of elasticity generally obtained numerical results showing a dependence of the energy release rate on the shear modulus of the material [54,56,57]. [21] highlights the fact that local deformation -in particular, deformation related to root rotations, i.e.…”

Section: Elasticity-theory Modelsmentioning

confidence: 99%

The Effects of Shear on Mode II Delamination

Valvo

2018

Frattura Ed Integrità Strutturale

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ABSTRACT. The paper focuses on the effects of shear deformation and shear forces on the mode II contribution to the energy release rate in delaminated beams. A critical review of the relevant literature is presented, starting from the end-notched flexure test as the prototype of delaminated laminates subjected to pure mode II fracture. Several models of the literature are recalled from simple beam theory to more refined models. The role of first-order shear deformation in line with the Timoshenko beam theory is investigated as distinct from the local crack-tip deformation related to the shear modulus of the material. Then, attention is moved on to a general delaminated beam with an arbitrarily located through-the-width delamination, subjected to mixedmode fracture. Several fracture mode partition methods of the literature are reviewed with specific attention on the effects of shear on the mode II contribution to the energy release rate.KEYWORDS. Delamination; Mixed-mode fracture; Mode II fracture; Beam theory; Shear deformation; End-notched flexure test.Citation: Valvo, P.S., The effects of shear on Mode II delamination: a critical review,

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Section: Elasticity-theory Modelsmentioning

confidence: 99%

The Effects of Shear on Mode II Delamination

Valvo

2018

Frattura Ed Integrità Strutturale

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“…The correction t_ the Mode II deformation was found to be similar but the effective increase in crack It ngth was found to be 0.42xh [12]. The qx and tin parameters (defined under parameter definitions in the nomenclature section) are used to scale the Mode I and Mode II deformations to account for the corrected crack lengths.…”

Section: Linear Model (Ln)mentioning

confidence: 98%

A Criterion to Control Nonlinear Error in the Mixed-Mode Bending Test

Reeder¹

2003

Composite Materials: Testing and Design, Fourteenth Volume

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Abstract:The mixed-mode bending test ha_'.been widely used to measure delamination toughness and was recently standardized by \STM as Standard Test Method D6671-01. This simple test is a combination of the stal_dard Mode I (opening) test and a Mode II (sliding) test. This test uses a unidirectionai composite test specimen with an artificial delamination subjected to bending loads to characterize when a delamination will extend.When the displacements become large, the linear theory used to analyze the results of the test yields errors in the calculated toughness values. The current standard places no limit on the specimen loading and therefore test data can be created using the standard that are significantly in error. A method of limiting the error that can be incurred in the calculated toughness values L,.needed. In this paper, nonlinear models of the MMB test are refined. One of the nonlir, ear models is then used to develop a simple criterion for prescribing conditions where tht: nonlinear error will remain below 5%.

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“…Where the term 0.42 ℎ is the correction added to the length of the crack to account for the root rotation of the beam arms [15] and 1 is the flexural modulus of the material which was measured for each specimen independently in the current experiments.…”

Section: Data Reduction Techniquementioning

confidence: 99%

Dynamic Mode II Delamination in Through Thickness Reinforced Composites

Yasaee

Mohamed

Pellegrino

et al. 2016

Fracture, Fatigue, Failure and Damage Evolution, Volume 8

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. ABSTRACTThrough thickness reinforcement (TTR) technologies have been shown to provide effective delamination resistance for laminated composite materials. The addition of this reinforcement allows for the design of highly damage tolerant composite structures, specifically when subjected to impact events. The aim of this investigation was to understand the delamination resistance of Z-pinned composites when subjected to increasing strain rates. Z-pinned laminated composites were manufactured and tested using three point end notched flexure (3ENF) specimens subjected to increasing loading rates from quasi-static (~0m/s) to high velocity impact (5m/s), using a range of test equipment including drop weight impact tower and a split Hopkinson bar (SHPB). Using a high speed impact camera and frame by frame pixel tracking of the strain rates, delamination velocities as well as the apparent fracture toughness of the Z-pinned laminates were measured and analysed. Experimental results indicate that there is a transition in the failure morphology of the Z-pinned laminates from quasi-static to high strain rates. The fundamental physical mechanisms that generate this transition are.

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Corrections for mode II fracture toughness specimens of composites materials

Cited by 229 publications

References 6 publications

The Effects of Shear on Mode II Delamination

The Effects of Shear on Mode II Delamination

A Criterion to Control Nonlinear Error in the Mixed-Mode Bending Test

Dynamic Mode II Delamination in Through Thickness Reinforced Composites

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