Crack induced interfacial debonding in damaged RC slabs strengthened with FRP

Feldfogel, Shai; Rabinovitch, Oded

doi:10.1007/s10704-018-0333-4

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…The strength decreased to 543.4 MPa, which was only 84.3% compared with a specimen without ply splice structures. This relation was correlated with equation (1). For a stacking sequence of [AE45 ] 5S , only a very small difference in the material strength was observed.…”

Section: Resultsmentioning

confidence: 60%

“…When the shape of the composite part is complex, such as a ball, many pieces of reinforcement plies are spliced together to meet the shape requirement. When the structure is large, such as for strengthening of construction projects, 1,2 because the size of the fabric is limited, pieces of plies should also be spliced. These operations should induce ply splice structures.…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties of ply splice fiber reinforced composite laminates

Zhu

Chen

Xing

et al. 2020

Journal of Composite Materials

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To fabricate large-scale or unusually shaped composite structures, pieces of reinforcement plies can be spliced to match specific size and shape requirements, forming ply splice structures. The junction of different plies can be considered a defect in the final material, affecting the mechanical properties. In this paper, ply splice carbon fiber reinforced plastics were studied to analyze the fracture mechanism caused by the ply splice, including the effects of the junction geometry and the ply angle. Tensile tests were performed, assisted with digital image correlation for strain distribution analysis and acoustic emission for break mode analysis. The finite element method was also performed using ABAQUS software to study the fracture mechanism. In order to analyze the interlaminar fracture, the interface was simulated with cohesive elements. The results showed that, for a unidirectional carbon fiber reinforced plastics with ply splice, fracturing occurred first at the junction location and then at the interfaces between the splicing layers and the continuous layers. The final strength was determined by the number of continuous layers. The ply-angle had evident effects on the properties of carbon fiber reinforced plastics with ply splices. For a stacking sequence of [± 30°]5S, the effects of the ply splice on the strength and the fracture mode were similar to the effect with unidirectional plates. For a stacking sequence of [± 45°]5S, the ply splice had no effect on the fracture mode, but it did decrease the strength slightly. For a stacking sequence of [± 60°]5S, almost no effect of the ply splice structure could be observed. PACS (optional, as per journal): 75.40.-s; 71.20.LP

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Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Tensile properties of ply splice fiber reinforced composite laminates

Zhu

Chen

Xing

et al. 2020

Journal of Composite Materials

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“…As a typical representative of advanced reinforced polymers, carbon fiber-reinforced polymers (CFRP) have been widely used in aerospace and other fields [1,2]. However, as the size of reinforced polymer structures increases, new problems such as inadequate length or width of a reinforced polymer arise.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanisms and Reinforcing Modes of Ply Splice Fiber-Reinforced Composite Laminates under Tensile Load

Zhu

Chen

2019

Materials

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To fabricate large-scale or unusually shaped composite structures, pieces of fabric plies can be spliced to match size and shape requirements, forming ply splice structures. The junction of different plies can be considered as a defect in the resulting composite material, affecting the overall mechanical properties. In this paper, unidirectional carbon fiber-reinforced plastic (CFRP) with ply splices was used as a research object to study these potential material defects. The effects of ply splices at different positions on the tensile properties of CFRP and the coupling between position of ply splicing were analyzed. Simultaneously, a finite element model was established to analyze the damage evolution, in which a continuous damage model and a cohesive zone model were used to describe the damage of the composite and interface layers, respectively. The model results were in good agreement with observed experimental results. Our results showed that there were three main factors for this failure mechanism: boundary effects, whether the ply splices were independent, or whether they were close to each other. In short, when two ply splices were located at the edge or independent of each other, the failure mode was first delamination and then fiber fracture, and the tensile strength was high. However, when the two ply splices were close to the edge or close to each other, the failure mode was first local fiber fracture and then delamination damage, and the resulting tensile strength was low. Finally, different reinforcement methods to improve the tensile properties of composites were adopted for the splicing layers at different positions through the analysis via model simulation. The two-side patch repair method was used to reinforce the ply splices on or near the edge. Additionally, increasing the toughness of the adhesive layer was used to reinforce the ply splices that were inside the material. These results showed that the tensile strength was enhanced by these two methods of reinforcement, and the initial damage load was especially increased.

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“…Attempting to overcome the geometrical limitations of the rectangular elements, Feldfogel and Rabinovitch [21–25] developed a multilayered plate theory and a corresponding triangular finite element. The formulation in [21,22] assumed flexible elastic interfaces and it was used for the static analysis of FRP-strengthened plates.…”

Section: Introductionmentioning

confidence: 99%

“…Szekrenyes [27] showed that including transverse stretching also improves the assessment of the energy release rate, compared with the first-order model. While taking into account the intermediate soft layer’s deformability, including the transverse stretching, Feldfogel and Rabinovitch [21–25] are limited to the static regime. As such, they are not equipped to handle the dynamic behavior of soft-core sandwich plates in general, and particularly under blast loading.…”

Section: Introductionmentioning

confidence: 99%

Soft-core sandwich plate dynamics: Theory and blast analysis

Feldfogel

Rabinovitch

2019

Jnl of Sandwich Structures & Materials

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This work presents an analytical and computational platform that aims to face the modeling, analytical, and computational challenges associated with highly transient dynamics of soft-core sandwich plates and shed light on the dynamic behavior of this unique structural form. This platform comprises a dynamic tri-layered plate analytical model and a corresponding specially tailored triangular finite element formulation. The model is based on extended high-order kinematics for the soft core layer, and it accounts for geometrical nonlinearity, high-order inertia terms, material orthotropy in the three physical layers, the presence of interfaces linking those layers, the interfacial tractions that develop across them, and the bi-directional dynamic response of the plate structure. The governing equations of the finite element formulation are solved in the time domain using a nonlinear Newmark-type time-stepping algorithm. The methodology is validated with regard to free vibration analysis and forced motion analysis against experimental results, 2D-, and 3D-elasticity-based closed form solutions, and multilayered plate finite elements reported in the literature. Following the validation, a numerical example considers the transient response of a soft-core sandwich plate subjected to highly transient air blast loading and compares the response with experimental results taken from the literature. The study examines the ability of present formulations to capture the experimentally observed response and to shed light on some aspects of the response, including the inherently 2D nature of the response, the propagation of stress fronts through the structural medium, and the interfacial interactions.

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Crack induced interfacial debonding in damaged RC slabs strengthened with FRP

Cited by 11 publications

References 31 publications

Tensile properties of ply splice fiber reinforced composite laminates

Tensile properties of ply splice fiber reinforced composite laminates

Failure Mechanisms and Reinforcing Modes of Ply Splice Fiber-Reinforced Composite Laminates under Tensile Load

Soft-core sandwich plate dynamics: Theory and blast analysis

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