The application of J integral to measure cohesive laws under large-scale yielding

Goutianos, Stergios; Sørensen, Bent F.

doi:10.1016/j.engfracmech.2016.01.004

Cited by 24 publications

(10 citation statements)

References 34 publications

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“…One limitation of this VCCT approach is that it ignores the non-linear material response introduced by the damage process zone ahead of the notch tip. The limitation can be overcome by introducing a strain-softening material response [1,19,20]. However, extracting an objective constitutive law for trans-laminar fracture itself requires special procedures [12,21].…”

Section: Introductionmentioning

confidence: 99%

Predicting notched tensile strength of full-scale composite structures from small coupons using fracture mechanics

Takeda

Aoki

et al. 2017

Composite Structures

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The initial fracture propagation within a full-scale stiffened quasi-isotropic composite panel and coupons with stringer feet under tensile loads was investigated. The specimens were made from Non-Crimp Fabric through Vacuum assisted Resin Transfer Moulding. The failure loads of all configurations were successfully related using the same value of trans-laminar fracture energy. The method involved independent tests of scaled-down Over-height Compact Tension specimens and the Virtual Crack Closure Technique. It was found to be crucial to include the fully developed damage process zone in the crack length and to interpret the results carefully in order to identify the failure loads consistently.

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Section: Introductionmentioning

confidence: 99%

Predicting notched tensile strength of full-scale composite structures from small coupons using fracture mechanics

Takeda

Aoki

et al. 2017

Composite Structures

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“…The Abaqus explicit solver is used to solve the problem of Figure 5 under quasi-static conditions using mass-scaling. An explicit solver is preferred to avoid convergence difficulties, which are commonly observed when modelling crack growth with implicit finite element methods [79,80].…”

Section: Finite Element Modellingmentioning

confidence: 99%

On the low reinforcing efficiency of carbon nanotubes in high-performance polymer fibres

Goutianos

Peijs

2021

Nanocomposites

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Driven by the exceptionally high mechanical properties of carbon nanotubes (CNTs), over the years an extensive research effort has been devoted to the reinforcement of high-performance polymer fibres with CNTs. However, to date, improvements in the strength of these fibres have been rather modest even for relatively high CNT contents. After a brief review of CNT reinforced polymer fibres, here, analytical and numerical finite element models will be used to show that these experimental findings are to be expected based on the intrinsic mechanical properties of these polymer fibres and CNTs, their aspect ratio and interfacial characteristics. Results show that for realistic CNT contents and aspect ratios, the extraordinary strength of CNTs cannot be easily fully exploited in high-performance polymer fibres like Dyneema V R or Kevlar V R . Even if CNTs are perfectly aligned, bonded and dispersed, the low intrinsic shear strength of these highly anisotropic polymer fibres limits effective stress transfer and nanotube reinforcement.

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“…The in-plane length of the cohesive element is 10 times the thickness h c and it is small enough to have more than 8 cohesive elements with the fracture process zone [43]. A non-zero cohesive zone thickness was preferred to avoid interpenetration problems [44]. As can be seen from Fig.…”

Section: Single Tape Compositementioning

confidence: 99%

Self-Reinforced Polypropylene Composites based on Discontinuous Tapes - An Experimental and Numerical Study of the Influence of Tape Length

et al. 2020

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The creation of highly oriented, coextruded polypropylene (PP) tapes allows the production of recyclable self-reinforced polypropylene (SRPP) or all-PP composites, with a large temperature processing window and high volume reinforcement content ($$\sim$$ ∼ 90%). The objective of this research is to assess the performance potential of SRPP composites based on discontinuous or short tapes. For this, the critical tape length for effective mechanical reinforcement of aligned discontinuous PP tapes was determined, while the stress transfer from PP matrix to PP tape was investigated in single tape model composites in combination with an optical strain mapping technique. Mechanical behaviour of both single tape as well as aligned tape model composites was evaluated using finite element analysis (FEA) and used to predict the properties of randomly oriented short tape composites. These discontinuous tape SRPP composites may be of interest from a manufacturing as well as recycling point of view. In terms of manufacturing, such systems are of interest as they may show improved formability during stamping or compression moulding operations while from a recycling point of view it would allow the re-use of production waste like cuttings of fabrics or tapes.

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The application of J integral to measure cohesive laws under large-scale yielding

Cited by 24 publications

References 34 publications

Predicting notched tensile strength of full-scale composite structures from small coupons using fracture mechanics

Predicting notched tensile strength of full-scale composite structures from small coupons using fracture mechanics

On the low reinforcing efficiency of carbon nanotubes in high-performance polymer fibres

Self-Reinforced Polypropylene Composites based on Discontinuous Tapes - An Experimental and Numerical Study of the Influence of Tape Length

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