Bilinear approximations to the mixed-mode I–II delamination cohesive law using an inverse method

Morais, A.B. de; Péreira, A.; Moura, M.F.S.F. de; Silva, F.G.A.; Dourado, N.

doi:10.1016/j.compstruct.2014.11.058

Cited by 44 publications

(3 citation statements)

References 26 publications

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“…In this study, both of the load values on these two points were noted, hereafter mentioned as onset failure load (OFL) and ultimate failure load (UFL), to evaluate the load-carrying capability of the joints. The OFL was calculated by the bilinear approximation method, which is commonly used in numerical modelling to characterize the structural failure and proved to provide good fits to the experimental L-D curves [28,29]. An example is shown on representative DLS (a) and PT (b) L-D curves for mechanically fastened joints in Fig.…”

Section: Mechanical Testing and Evaluationmentioning

confidence: 99%

Mechanical behaviour of thermoplastic composites spot-welded and mechanically fastened joints: A preliminary comparison

Zhao

Palardy

Villegas

et al. 2017

Composites Part B: Engineering

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The in-plane and out-of-plane mechanical behaviour of both ultrasonically spot-welded and mechanically fastened joints was investigated by double-lap shear and pull-through tests, respectively. Spot-welded specimens showed comparable onset failure load and significantly higher joint stiffness compared to mechanical fasteners when carrying shear load. The failure modes and the damage within specimens were analysed after mechanical tests. Intralaminar failure and very limited damage on the out-most ply were found for welded specimens, whereas catastrophic through-the-thickness failure was observed for mechanically fastened joints. Based on the experimental outcomes, the mechanical performance and failure mechanisms of spot-welded joints were critically assessed in comparison to the mechanical fasteners .

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Section: Mechanical Testing and Evaluationmentioning

confidence: 99%

Mechanical behaviour of thermoplastic composites spot-welded and mechanically fastened joints: A preliminary comparison

Zhao

Palardy

Villegas

et al. 2017

Composites Part B: Engineering

View full text Add to dashboard Cite

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“… Comparison of critical energy release rates G Ic —( a ) and G IIc —( b ), and elastic modulus E 1 of unidirectional thermoset and thermoplastic based composites. Filled and hollow marks stands for thermoplastic and thermoset systems, respectively [ 7 , 16 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 ]. …”

Section: Figurementioning

confidence: 99%

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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“…Although these techniques require very high resolution equipment to capture the CTOD or FPZ, which can cost a lot of money and be difficult to implement in specimens tested in a controlled environmental. Another option is to use inverse methods for minimising the residual between experimental and numerical

curves [ 44 , 63 , 64 , 65 , 66 ]. However, despite their simplicity, they are very time-consuming because it is necessary several virtual tests to evaluate different values of each parameter of the softening function

.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Mode I Interlaminar Damage of a GFRP Composite Using Cohesive Laws in the Framework of the Equivalent LEFM R-Curve and an Optimised Algorithm

et al. 2021

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This paper is focused on mode I delimitation of a unidirectional glass fibre reinforced polymer (GFRP) composite. The aim is to propose an accurate and simple characterisation of three cohesive zone models (CZM)—bilinear, trilinear, and potential—from the measurement of the load-displacement curve during a double cantilever beam experimental test. For that, a framework based on the equivalent linear elastic fracture mechanics (LEFM) R-curve is here proposed, which has never before been developed for a bilinear and a potential CZM. Besides, in order to validate this strategy, an optimisation algorithm for solving an inverse problem is also implemented. It is shown that the parameters’ identification using the equivalent LEFM R-curve enables the same accuracy but reduces 72% the numerical efforts respect to a “blind fitting” (i.e., the optimisation algorithm). Therefore, even if optimisation techniques become popular at present due to their easy numerical implementation, strategies founded on physical models are still better solutions especially when evaluating the objective function is expensive as in mechanical problems.

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Bilinear approximations to the mixed-mode I–II delamination cohesive law using an inverse method

Cited by 44 publications

References 26 publications

Mechanical behaviour of thermoplastic composites spot-welded and mechanically fastened joints: A preliminary comparison

Mechanical behaviour of thermoplastic composites spot-welded and mechanically fastened joints: A preliminary comparison

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

Simulation of Mode I Interlaminar Damage of a GFRP Composite Using Cohesive Laws in the Framework of the Equivalent LEFM R-Curve and an Optimised Algorithm

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