Effect of stiffness matrices terms on delamination front shape in laminates with elastic couplings

Rzeczkowski, Jakub; Samborski, Sylwester; Valvo, Paolo Sebastiano

doi:10.1016/j.compstruct.2019.111547

Cited by 24 publications

(19 citation statements)

References 23 publications

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“…The resulting load creates an almost pure shear stress state at the crack tip, provided that the specimen is designed so that the adherends deform elastically, which provides shear characterization. The simplicity of this specimen is one of the main reasons to be widely used in mode II fracture characterization [ 109 ]; Mode III ( Figure 3 c): This mode involves a tearing motion or anti-plane shear mode, and does not occur as often as the other two in FRP structural applications, even though it may appear in result of elastic couplings [ 110 , 111 , 112 , 113 ]. …”

Section: Strength Testing In Frp Jointsmentioning

confidence: 99%

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Thermoplastic Composites and Their Promising Applications in Joining and Repair Composites Structures: A Review

2020

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Thermoset fiber reinforced composites, widely used in current structural applications, have complex repair procedures and generates significant amounts of scrap due to its recycling difficulties, which does not comply with the most recent environmental restrictions. These disadvantages may be overcome by using a thermoplastic matrix phase, which is very suitable to be joined and repaired by local melting, making the composite material fully recyclable. This work presents a literature review on the joining methods applicable to thermoplastic based composites and their potential applications to be used as repair procedures in structural elements. The effectiveness of selected adhesive and fusion bonding techniques for several thermoplastic composite systems is evaluated by a comparative study based on the joints’ strength and toughness results available in the literature. This work focuses on the three most promising fusion bonding techniques: Resistance welding, induction welding, and ultrasonic welding. The advantages and drawbacks for each one of these processes are discussed, as well as their suitability for several specific structural applications. In addition, several discordant aspects for each welding technique are identified and the corresponding recommendations are discussed. A compilation of analytical models for the mechanisms of heat generation and transient heat transfer modelling is also presented for each fusion bonding process in order to promote their application in numerical modelling.

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Section: Strength Testing In Frp Jointsmentioning

confidence: 99%

“…Mode III ( Figure 3 c): This mode involves a tearing motion or anti-plane shear mode, and does not occur as often as the other two in FRP structural applications, even though it may appear in result of elastic couplings [ 110 , 111 , 112 , 113 ].…”

Section: Strength Testing In Frp Jointsmentioning

confidence: 99%

Thermoplastic Composites and Their Promising Applications in Joining and Repair Composites Structures: A Review

2020

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“…It is indicated that this approach is not able to capture the variation of the delamination front along the width with or without eventual elastic coupling, since the approach presented is developed in the 1D-beam framework. The reader is referred to [22] for this topic. An experimental test campaign is then presented on the thermoset unidirectional (UD) prepreg composite material IMA/M21E.…”

Section: Introductionmentioning

confidence: 99%

Validation of a simplified analysis for the simulation of delamination of CFRP composite laminated materials under pure mode I

Lachaud

Paroissien

Michel

2020

Composite Structures

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The cohesive zone modelling (CZM) is extensively used for the simulation of delamination propagation of composite laminated materials. The Finite Element (FE) method is able to support the CZM. Nevertheless, a refined mesh in the cohesive zone is required to describe accurately the energy dissipation. A 1D-beam simplified analysis based on the macro-element (ME) technique has been developed for the stress analysis of bonded joints, supporting damage evolution adhesive material law. The objective of this paper is to provide a validation of the ability of this macro-element technique for the simulation of delamination propagation in pure mode I of composite laminates. This validation is led through a comparative study between experimental test results, 3D FE model predictions and 1D-beam ME predictions. The experimental test campaign allows in particular for the assessment of the interlaminar strength and critical energy release rate in pure mode I. The thermoset unidirectional (UD) prepreg composite material IMA/M21E is used for this paper.

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“…This form of material deterioration is understood as interlaminar cleavage that can be studied within the framework of Fracture Mechanics, as 2D or 3D crack initiation and propagation [ 11 , 12 , 13 ]. This demands the determination of fracture toughness with standardized procedures, providing globally the three classical fracture modes [ 14 , 15 , 16 , 17 ], which may be a demanding task when atypical layups come into play, for example those evoking elastic couplings [ 18 ]. In any case, damage detection, monitoring and identification is possible with contemporary experimental methods supported by appropriate modelling techniques, such us the Finite Element Method (FEM) and analytical solutions.…”

Section: Introductionmentioning

confidence: 99%

Stability and Load-Carrying Capacity of Thin-Walled FRP Composite Z-Profiles under Eccentric Compression

et al. 2020

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This study investigates the effect of eccentric compressive load on the stability, critical states and load-carrying capacity of thin-walled composite Z-profiles. Short thin-walled columns made of carbon fiber-reinforced plastic composite material fabricated by the autoclave technique are examined. In experimental tests, the thin-walled structures were compressed until a loss of their load-carrying capacity was obtained. The test parameters were measured to describe the structure’s behavior, including the phenomenon of composite material failure. The post-critical load-displacement equilibrium paths and the acoustic emission signal enabling analysis of the composite material condition during the loading process were measured. The scope of the study also included performing numerical simulations by finite element method to solve the problem of non-linear stability and to describe the phenomenon of composite material damage based on the progressive failure model. The obtained numerical results showed a good agreement with the experimental characteristics of real structures. The numerical results are compared with the experimental findings to validate the developed numerical model.

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Effect of stiffness matrices terms on delamination front shape in laminates with elastic couplings

Cited by 24 publications

References 23 publications

Thermoplastic Composites and Their Promising Applications in Joining and Repair Composites Structures: A Review

Thermoplastic Composites and Their Promising Applications in Joining and Repair Composites Structures: A Review

Validation of a simplified analysis for the simulation of delamination of CFRP composite laminated materials under pure mode I

Stability and Load-Carrying Capacity of Thin-Walled FRP Composite Z-Profiles under Eccentric Compression

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