A Numerical and Experimental Study of Delaminated Layered Composites

Mukherjee, Yu Xie; Gulrajani, Sunil N.; Mukherjee, Subrata; Netravali, Anil N.

doi:10.1177/002199839402800904

Cited by 37 publications

(23 citation statements)

References 25 publications

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“…---------(1) Equation 1 shows the work done to close the crack [2] and the stress displacement distribution to the crack displacement shown above. Figure 1 respectively giving the crack tip status, before and after the crack propagation.…”

Section: Fig3 Experimental Testingmentioning

confidence: 99%

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Evaluation of Energy Release Rate for Mode I Crack propagation in GFRP structures

B.T¹,

Kulkarni²,

L.J³

2017

IJET

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-Unstable propagation of a crack results in fracture due to applied stress. Fracture mechanics provides a methodology for prediction, prevention, and control of fracture in materials, components and structures subjected to static, dynamic, and sustained loads. De-lamination is considered to be the most occurring failure mode in composites, a partition of the layers that are stacked together to form laminates. Delaminations appear at stress free edges due to the difference in properties of the individual layers, at ply drops where thickness should be reduced, and at regions subjected to out-of-plane loading like bending of curved beams. An experimental analysis was performed for analyzing the energy release rate for mode I crack propagation of the DCB specimen for different volume fractions. Double Cantilever Beam Specimen was analyzed for mode I crack propagation subjected tensile load and Energy Release Rate was evaluated for different crack lengths using ANSYS 15. Virtual Crack Closure method was used to find the Energy Release Rate by considering the displacements (V) at the flagged nodes near the crack tip and then was compared with the analytical results. Virtual Crack Closure method showed very good agreement with the experimental results. Convergence was achieved through refinement and results were extracted for variation of SIF along the crack front. It was observed from the results that the ERR increased at a very slow rate in the beginning of the crack growth (a/w = 0.2 to a/w = 0.4). As a/w reached 0.5 there was a steep increase in the Energy Release Rate. This was purely because of the plastic zone at the crack tip getting increased. This in turn increases the resistance offered by the crack to the propagation. Keywords -Virtual Crack Closure Technique, Energy Release Rate, Crack propagation.I. INTRODUCTION De-lamination is considered to be the most occurring failure mode in composites, a partition of the layers that are stacked together to form laminates. Delaminations appear at stress free edges due to the difference in properties of the individual layers, at ply drops where thickness should be reduced, and at regions subjected to out-of-plane loading like bending of curved beams. Opening mode (mode I), the sliding shear mode (mode II), and the scissoring shear mode (mode III) are the three different modes of crack propagation. The fracture toughness linked with each fracture modes must be characterized and the equivalent strain energy release rates for each mode connected with the design and loading of interest must be evaluated to predict de-lamination onset and growth. M. Kenane et, al [1] carried out a de-lamination fatigue-crack growth experiments on unidirectional glass/epoxy laminates. Three specimen types were tested: double cantilever beam (DCB), mixed-mode bending (MMB), and end-loaded split (ELS), for mode I, mixed-mode I + II, and mode II loading, respectively. Fracture mechanics technology was applied through the principles of strain-energy release rate. The measured de-lamin...

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Section: Fig3 Experimental Testingmentioning

confidence: 99%

“…shows the modified work done to close the crack considering both stress field and the displacement [2] …”

Section: Fig3 Experimental Testingmentioning

confidence: 99%

Evaluation of Energy Release Rate for Mode I Crack propagation in GFRP structures

B.T¹,

Kulkarni²,

L.J³

2017

IJET

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“…Whitcomb (1989) was one of the first to introduce the use of the VCCT to determine Strain Energy Release rate distributions for a circular delamination. Since then, a lot of numerical analyses have been performed by using this technique: many of them dealing with delamination growth initiation (Mukherjee et al, 1994)- (Whitcomb,1992), others with growth evolution (Klug et al, 1996) When dealing with three-dimensional problems, the one-step Virtual Crack Closure Technique (VCCT) is generally used instead of the two-steps Virtual Crack Closure Technique in order to reduce the computational time requested for the analysis.…”

Section: Delamination Growth Criteriamentioning

confidence: 99%

Virtual Crack Closure Technique and Finite Element Method for Predicting the Delamination Growth Initiation in Composite Structures

Pietropaoli¹

2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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“…Since then, a lot of numerical analyses have been performed by using this technique, many of them dealing with initiations and growth of delamination, see Mukherjee et al (1994), others with growth evolution, Klug et al (1996).…”

Section: Introductionmentioning

confidence: 99%

Effects of the composite stacking sequence on the failure load of the single lap bonded joint

Mokhtari

Madani²,

Benzaama

et al. 2017

jtam

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Composite materials are widely used in aircraft structures, their relative rigidity/weight confers their advantage over metal structures, and the stacking sequence plays an important role for their use. The objective of this work is to analyze by the finite element method the mechanical behavior of a single lap joint of composite/composite type under a tensile load. In order to see the effects on the failure load, two basic parameters are taken into consideration; the stacking sequence of composite and thickness of each layer constituting the composite. Calculation of the failure load is made numerically with the ABAQUS code using the developed technique of VCCT (Virtual Crack Closure Technique) based on fracture mechanics. Finally, the influence of the bonding defect on the failure load is analyzed. The results clearly show the importance of optimizing fiber orientation and hence the stacking sequence for proper use of composite in bonded assemblies.

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A Numerical and Experimental Study of Delaminated Layered Composites

Cited by 37 publications

References 25 publications

Evaluation of Energy Release Rate for Mode I Crack propagation in GFRP structures

Evaluation of Energy Release Rate for Mode I Crack propagation in GFRP structures

Virtual Crack Closure Technique and Finite Element Method for Predicting the Delamination Growth Initiation in Composite Structures

Effects of the composite stacking sequence on the failure load of the single lap bonded joint

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