Delamination strength of composite curved beams reinforced by grooved stainless-steel Z-pins

Ju, Hyunwoo; Nguyen, Khanh-Hung; Chae, Song-Su; Kweon, Jin‐Hwe

doi:10.1016/j.compstruct.2017.08.018

Cited by 23 publications

(11 citation statements)

References 18 publications

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“…In previous research, [3][4][5][7][8][9] stress analyses were conducted for unidirectional laminates with [0] n fibers in the bending direction, 3,5,10,12,13 orthogonal laminates with [0/90] n fibers, and plain weave laminates. 4,7 Pseudo-isotropic laminates have been analyzed by considering the anisotropic elastic constants and fiber orientation angles of each layer.…”

Section: Finite Element Analysis Modelmentioning

confidence: 99%

“…[1][2][3] Previous research used the strength test method to determine the direction of delamination in the direct out-of-plane loading test, 1 the three-point bending test, 2 and the Lshaped bending test. [3][4][5][6][7][8][9][10][11][12][13][14] The stress distributions obtained from the finite element method (FEM) analysis results of the L-shaped bending tests of unidirectional CFRP with the longitudinal fiber direction were compared with theoretical evaluation equations based on material mechanics and found to be in good agreement. 3,6,8,9,[11][12][13][14] Some studies treat the CFRP flexural section as homogeneous material and use a three-dimensional (3-D) finite element analysis to evaluate the stress distribution in flexural laminations using FEM analysis.…”

Section: Introductionmentioning

confidence: 99%

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Strength analysis in L-angle section of carbon-fiber-reinforced plastic by measuring distributions of out-of-plane strain and stress

Sawada

2022

Journal of Reinforced Plastics and Composites

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This study provides an engineering-valid and simple strength evaluation method for the L-angle part in carbon-fiber-reinforced plastic (CFRP) laminates. A four-point bending test according to ASTM D6415 was performed on L-angle specimens made of pseudo-isotropically laminated CFRP, and the full-field strain distribution at the curvature was measured using digital image correlation. A two-dimensional finite element model was constructed to simulate the four-point bending test, load–displacement curve, and maximum principal strain distribution; all agreed with the experimental results. The theoretical equation for calculating the stress distribution at the curvature agreed with the maximum out-of-plane stress at the 30.5-MPa bend and the stress distribution in the stacking direction obtained from the analytical results. Furthermore, the relationship between the load and the changed angle of the curvature part replicated satisfactory experimental results, and delamination occurred when the angle of the bent part reached 1.5°, indicating the rotation angle of those parts can diagnose the integrity in curved portions. Therefore, the proposed model can qualitatively explain the failure mode of bent sections.

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Section: Finite Element Analysis Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength analysis in L-angle section of carbon-fiber-reinforced plastic by measuring distributions of out-of-plane strain and stress

Sawada

2022

Journal of Reinforced Plastics and Composites

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“…The study also reported that carbon fibre pins are most effective in enhancing delamination strength and fatigue properties of composite laminates. Hyunwoo et al 26 analysed the effect of grooved steel pins on the flexural behaviour of curved composite beams. Results revealed that grooved pins improved flexural strength by 40%.…”

Section: Introductionmentioning

confidence: 99%

Influence of glass fibre reinforced polymer composite pin reinforcement on shear and dynamic behaviour of composite joint manufactured through co-cure technique

Dhilipkumar

Rajesh

2022

Journal of Composite Materials

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The co-cure technique efficiently joins composite components in wings, ailerons, skins, ribs and spars in aeronautical applications. The present study investigates the effect of through-thickness reinforcement of glass fibre reinforced polymer composite pin on shear and dynamic properties of co-cured composite joints. The experimental results exhibited that through-thickness reinforcement with 2% composite pin volume significantly improved the shear strength and elongation limit by 38.4% and 102.4% compared to unpinned joints. Furthermore, composite pin reinforcement changed the catastrophic failure of co-cured joints to progressive failure due to the tougher bridging traction of composite pins. The comparison of fractured surfaces exposed that debonding, composite pin pull-out and shear fracture of pins are the major failure mechanisms involved in enhanced shear strength and progressive failure of co-cured composite joints. The experimental modal analysis avowed that through-thickness reinforcement with 2% composite pin volume improved the fundamental natural frequency of the co-cure joints, while co-cure joint reinforced with higher volume (4%) of composite pins had higher damping value due to excessive fibre damage, which increased interaction between composite adherent and adhesive.

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“…Thus, the prediction of the ILTS value and its post-failure evolution is a key factor when approaching the development of efficient designs. Numerical methodologies to predict ILTS in curved beams are proposed in several studies, such as those carried out by Raju [2], Avalon [4], Martin [5], Ross [6], Gozluklu [7], Kim [8], Ju [9] and Nguyen [10]. Although, different numerical methodologies to predict the onset and evolution of delamination are currently implemented in the packages of finite elements, Cohesive Zone Model (CZM) [2], [7], [11]- [14] has been used in the present study.…”

Section: Introductionmentioning

confidence: 99%

Enhanced cohesive zone model to predict delamination behavior of carbon/epoxy laminated curved beams

Ranz

Cuartero

Castejón

et al. 2020

Mechanics of Advanced Materials and Structures

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This paper proposes an enhanced Cohesive Zone Model (CZM) for the prediction of delamination in curved beams of epoxy carbon laminates. This model improves the conventional CZM, taking into account the fiber-bridging phenomenon and the variation of the element size among the thickness in the curved zone. The advantages of the enhanced model are underlined when results obtained from the numerical simulations of a four-point-bending test in compliance with ASTM D6415 standard are compared with the corresponding experimental results. The prediction of the post-failure behaviour obtained with this model is closer to that obtained experimentally than with the conventional model.

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Delamination strength of composite curved beams reinforced by grooved stainless-steel Z-pins

Cited by 23 publications

References 18 publications

Strength analysis in L-angle section of carbon-fiber-reinforced plastic by measuring distributions of out-of-plane strain and stress

Strength analysis in L-angle section of carbon-fiber-reinforced plastic by measuring distributions of out-of-plane strain and stress

Influence of glass fibre reinforced polymer composite pin reinforcement on shear and dynamic behaviour of composite joint manufactured through co-cure technique

Enhanced cohesive zone model to predict delamination behavior of carbon/epoxy laminated curved beams

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