Reexamination of the edge crack torsion test for determining the mode III delamination toughness of laminated composites

Audd, Clay; Davidson, Barry D.; Ratcliffe, James G.; Czabaj, Michael W.

doi:10.1016/j.engfracmech.2019.05.007

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…This statement can be justified by the facts that the size of mathematical model is smaller than that of the first-order theory, it is the same as that of third-order model, and in the crucial cases (case II and IV for the hyperbolic shell), its performance was a little bit better than that of the first-order theory. The possible application field of the presented models is to model plated fracture specimens [76][77][78]. Table 4 Multiplicator matrix elements for the FST theory, p = u or v [i, j] Undelaminated part [i, j] Delaminated part K (0) ( p)i j K (1) ( p)i j K (0) ( p)i j K (1) i j [ Table 5 Multiplicator matrix elements for the SST theory, undelaminated part, where p = u or v. If p = u, then R p = R 1 , if p = v, then R p = R 2…”

Section: Discussionmentioning

confidence: 99%

Higher-order semi-layerwise models for doubly curved delaminated composite shells

Szekrényes

2020

Arch Appl Mech

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This work deals w ith the development and extension of higher-order models for delaminated doubly curved composite shells with constant radii of curvatures. The mechanical model is based on the method of four equivalent single layers and the system of exact kinematic conditions. A remarkable addition of this work compared to some previous ones, is a modified and improved continuity condition between the delaminated and undelaminated parts of the shell. Using the principle of virtual work, the equilibrium equations of the shell systems are brought to the stage and solved by using the classical Lévy plate formulation under simply supported conditions. Four different scenarios of elliptic and hyperbolic delaminated shells are investigated providing the solutions for the mechanical fields as well as for the J-integral. The analytical results are compared to 3D finite element calculations, and excellent agreement was obtained for the displacement components and normal stresses. On the contrary, it was found that the transverse shear stresses are captured quite differently by the proposed method and the finite element models. Although the role of shear stresses should not be underrated, they seem to be marginal because the distributions of the J-integral components are in very good agreement with the numerically determined energy release rates.

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Section: Discussionmentioning

confidence: 99%

Higher-order semi-layerwise models for doubly curved delaminated composite shells

Szekrényes

2020

Arch Appl Mech

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“… 80 Pennas and Cantwell 86 investigated the mode III fracture toughness of a glass/epoxy steel bimaterial system using ECT test geometries. Audd et al 87 conducted edge crack torsion tests on laminated composites, with ECT specimens prepregged with carbon/epoxy tape.…”

Section: Adhesion Test Methods Of Stainless Steel and Resinmentioning

confidence: 99%

Surface Treat Method to Improve the Adhesion between Stainless Steel and Resin: A Review

Du,

Zhou,

et al. 2023

ACS Omega

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Combining metal and polymer into hybrid composite materials is finding increasing interest in many industries. Special attention is being paid to increase the adhesion between the metal and polymer interface. In this paper, the current research progress of surface treatment methods for improving the interfacial adhesion of stainless steel and resin is reviewed. It involves the stainless steel surface treatment method, resin surface treatment method, and adhesion test methods of stainless steel and resin. The methods of improving the interfacial adhesion of stainless steel and resin are summarized and prospected according to the research status.

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“…There has been no recognized experimental standard for the mode III delamination test up to now. The experimental results obtained via edge crack torsion (ECT) [46] and split cantilever beam (SCB) [47] are sensitive to geometric parameters of structures. In addition, the results are affected by the mixed-mode ratio, which lead to inaccurate measurements.…”

Section: Delamination Testmentioning

confidence: 99%

Review and Assessment of Fatigue Delamination Damage of Laminated Composite Structures

Deng,

Zhou,

et al. 2023

Materials

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Fatigue delamination damage is one of the most important fatigue failure modes for laminated composite structures. However, there are still many challenging problems in the development of the theoretical framework, mathematical/physical models, and numerical simulation of fatigue delamination. What is more, it is essential to establish a systematic classification of these methods and models. This article reviews the experimental phenomena of delamination onset and propagation under fatigue loading. The authors reviewed the commonly used phenomenological models for laminated composite structures. The research methods, general modeling formulas, and development prospects of phenomenological models were presented in detail. Based on the analysis of finite element models (FEMs) for laminated composite structures, several simulation methods for fatigue delamination damage models (FDDMs) were carefully classified. Then, the whole procedure, range of applications, capability assessment, and advantages and limitations of the models, which were based on four types of theoretical frameworks, were also discussed in detail. The theoretical frameworks include the strength theory model (SM), fracture mechanics model (FM), damage mechanics model (DM), and hybrid model (HM). To the best of the authors’ knowledge, the FDDM based on the modified Paris law within the framework of hybrid fracture and damage mechanics is the most effective method so far. However, it is difficult for the traditional FDDM to solve the problem of the spatial delamination of complex structures. In addition, the balance between the cost of acquiring the model and the computational efficiency of the model is also critical. Therefore, several potential research directions, such as the extended finite element method (XFEM), isogeometric analysis (IGA), phase-field model (PFM), artificial intelligence algorithm, and higher-order deformation theory (HODT), have been presented in the conclusions. Through validation by investigators, these research directions have the ability to overcome the challenging technical issues in the fatigue delamination prediction of laminated composite structures.

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Reexamination of the edge crack torsion test for determining the mode III delamination toughness of laminated composites

Cited by 13 publications

References 17 publications

Higher-order semi-layerwise models for doubly curved delaminated composite shells

Higher-order semi-layerwise models for doubly curved delaminated composite shells

Surface Treat Method to Improve the Adhesion between Stainless Steel and Resin: A Review

Review and Assessment of Fatigue Delamination Damage of Laminated Composite Structures

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