Characterization of strain-softening behavior and failure mechanisms of composites under tension and compression

Zobeiry, Navid; Vaziri, Reza; Poursartip, Anoush

doi:10.1016/j.compositesa.2014.09.009

Cited by 85 publications

(52 citation statements)

References 33 publications

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“…in coupon tests [2][3][4][5][6][7] and observed in full-scale composite structural tests [8]. On the other hand, many existing approaches for modelling Mode I trans-laminar fracture [9][10][11][12] do not directly address R-curves and assume a constant Mode I trans-laminar fracture toughness value during fracture propagation.…”

Section: Introductionmentioning

confidence: 99%

“…Catalanotti et al [18] also applied their method to QI CP-T700/ACE Non-Crimp Fabrics. The approaches [6,10,11,18] to determine trans-laminar fracture toughness either rely on inputs from modelled notched tests [10,11], or the results from separate sets of scaled notched tensile tests [18]. The numerical prediction of R-curves for QI laminates without input parameters from the modelled fracture tests has not been reported before.…”

Section: Introductionmentioning

confidence: 99%

“…An Over-height Compact Tension (OCT) test was therefore developed to reduce the potential compressive failures [24]. The OCT configuration has been used in numerous studies [10,25,26].…”

Section: Introductionmentioning

confidence: 99%

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Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

Wisnom

Hallett³

2019

Composites Part A: Applied Science and Manufacturing

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The R-curve for Mode I trans-laminar fracture energy in quasi-isotropic IM7/8552 carbon/epoxy laminates is here deduced numerically from a virtual Over-height Compact Tension (OCT) test. A High-fidelity Finite Element Method (Hi-FEM) using the explicit Finite Element (FE) software LS-Dyna was adopted. Cohesive interface elements and a Weibull fibre failure criterion were used to predict failure. The input parameters for the Hi-FEM were measured from independent characterisation tests.OCT specimens were tested to verify the Hi-FEM results with good agreement. The Rcurve effect is postulated to be caused by the growth of the height of the Fracture Process Zone (FPZ) with crack length. Hi-FEM can be used to better understand Mode I trans-laminar fracture toughness tests and generate fracture properties such as damage heights and R-curves for future structural scale models.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

Wisnom

Hallett³

2019

Composites Part A: Applied Science and Manufacturing

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“…Furthermore, addition of HGB particles results in the fading of strain softening and disappearance of cold drawing. Fragmentation of large crystallites and their deformation/reorientation were the main cause of the strain softening accompanied with a localization of the plastic deformation in post‐yield behavior of PP . The results reveal the reduction in the ductility of the polymer is accompanied with the incorporation of HGB particles.…”

Section: Resultsmentioning

confidence: 90%

Tailoring of thermal and mechanical properties of hollow glass bead‐filled polypropylene porous Films via stretching ratio and filler content

et al. 2018

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The momentous role of hollow glass bead (HGB) fillers to manipulate the thermal and mechanical properties of polymers has become an issue of significant interest. As regards, the scope of this work is oriented to manifest the interplay effects of HGB contents (average size of 60 μm) and uniaxial stretching ratios (100 and 200%) on HGB‐filled bimodal polypropylene (PP) films. SEM micrographs showed that at higher stretching ratio at about 120°C the pore formation was improved which was due to performance of smaller HGB particles. Also increasing the amount of HGBs could notably decrease the permeability of microporous composite films as a result of compaction effect. Moreover, an additional peak in the differential scanning calorimetry of composite films was the nucleating performance of smaller HGB particles. The yielding behavior of the precursor and porous PP samples prepared by hot stretching was analyzed by tensile testing. The results revealed that with the increase in the number of pores, strain softening was faded and eventually completely removed. Therefore, a ductile‐brittle transition occurred in the behavior of the polymer. POLYM. COMPOS., 40:2938–2945, 2019. © 2018 Society of Plastics Engineers

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“…Failure of these materials involves evolution of various damage mechanisms, such as fibre breakage and matrix cracks [38,14], where the debonding of adjacent laminate layers, also known as delamination, is considered to be one of the most dominant damage mechanisms affecting the behaviour of composite laminates. Delamination will usually lead to a reduction in structural stiffness and load carrying capability, and can also lead to instability and premature structural failure under compressive loading [2].…”

Section: Introductionmentioning

confidence: 99%

Adaptive insertion of cohesive elements for simulation of delamination in laminated composite materials

Shor

Vaziri

2015

Engineering Fracture Mechanics

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a b s t r a c tA novel technique for efficient simulation of progressive delamination in large-scale laminated composite structures is presented. During the transient analysis, continuum elements within regions where delamination has the potential to initiate are adaptively split through their thickness into two shell elements sandwiching a cohesive element. By eliminating the a priori requirement to implant cohesive elements at all possible spatial locations, the computational efforts are reduced, thus lending the method suitable for treatment of practical size structures. The methodology is verified here through its application to Mode-I, Mode-II and Mixed-Mode loading conditions for which benchmark solutions exist.

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Characterization of strain-softening behavior and failure mechanisms of composites under tension and compression

Cited by 85 publications

References 33 publications

Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

Tailoring of thermal and mechanical properties of hollow glass bead‐filled polypropylene porous Films via stretching ratio and filler content

Adaptive insertion of cohesive elements for simulation of delamination in laminated composite materials

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