Numerical simulations of crack propagation tests in adhesive bonded joints

Barros, Sílvio de; Champaney, Laurent; Valoroso, Nunziante

doi:10.1590/s1679-78252012000300002

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…Recently, a cohesive zone model (CZM) modelling methodology has been shown to be a versatile approach to predict the durability of adhesively bonded joints exposed to humid environments [68,164,[180][181][182][183]. The accurate prediction of failure behaviour should be correctly implemented using a traction-separation law which includes triangular, trapezoidal and exponential shape [184,185]. The parameters that principally define the traction-separation response are the cohesive fracture energy and the critical traction of the adhesive in each fracture mode.…”

Section: Finite Element Methodsmentioning

confidence: 99%

Bonded repair of composite structures in aerospace application: a review on environmental issues

2018

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IntroductionOutstanding properties of fiber reinforced polymer composite materials, lead to a wide application in all the sectors such as aerospace, automotive, marine, sports industries and even in the civil infrastructures, etc. Since the last decades, an enormous use of composite materials in the aerospace sector has caused an increasing need for repair technology of damaged component rather than replacement with a new component [1][2][3][4]. Composite structures in service experience damage that comes from the accidental impact and mechanical or environmental condition [5,6]. The main environmental threats are related to the effect of temperature and moisture absorption, which can affect the strength of composite structures and reduce their service life [4,7,8]. The temperature and moisture levels could vary throughout the day (see Fig. 1), from take off to the landing or vice versa, during seasonal change or geographical difference [9]. This cyclic temperature and moisture could even further deteriorate the structures and then lead to premature failure of the structure. AbstractOver the last two decades, the repair of existing engineering structures using fiber reinforced polymer composites has attracted a great attention by aerospace industry, as it is more economical than replacing new. With an increased use of composite material in aerospace field, it is thus essential to restore the structural integrity by repair of damaged part. Concerns regarding the long term durability of composite repair bonded joints have been a major obstacle for critical component of aerospace structures. This paper reviews the current research on the environmental durability of adhesive bonded repair of composite structures to focus on the durability concerns and suggestion on the research needed in this area. The most important environmental factors (moisture and temperature) are reviewed thoroughly and also combined environmental effect. Finite element methods used to predict the environmental influence on the composite bonded joints are briefly reviewed. Finally, the paper concludes with key findings, opportunities and future research topics in order to develop cost effective, better quality and reliable composite repair bonded joints.

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Section: Finite Element Methodsmentioning

confidence: 99%

Bonded repair of composite structures in aerospace application: a review on environmental issues

2018

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“…An example of the Direct Beam Theory Method -DBT, uses beam theory and the IIC and equation (2): (4) Where δ is the vertical displacement of the specimen.…”

Section: Methods For Determining Iicmentioning

confidence: 99%

Evaluation of structural adhesive joints fracture toughness without crack measurement

2021

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The adhesive fracture resistance of structural adhesive joints in mode II, IIC , is accessed through the application of two models that prescind of the measurement of the crack length during the subjection of ENF specimens to three-point bending monotonic tests. The load vs transversal displacement results are used in two different approaches: a damage model and a cohesive zone model. The first one was used in test where the crack propagation was unstable and the second one was used for stable crack propagations. These initial results show the viability of the models and show that both: initial crack length and transversal load rate; have great influence in IIC evaluation.

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“…The elastic energy was obtained from the area under the curve in the section delineated by phases 1 to 3. The dissipated energy was obtained from the difference in areas under the curve of samples with different crack sizes, following the methodology found in [4]. In this sense, given the results presented, it is important to highlight the role of interfacial contact on the adhesion between the coating layers, as it was the only variable that influenced the mechanical performance of the samples under study.…”

Section: Analysis Of Adhesion Using the Energy Criterionmentioning

confidence: 99%

“…Furthermore, other small pre-existing defects, arising from bonding failures, may also be present and propagate through these efforts. According to [4], crack propagation tests would therefore be the most suitable for evaluating the quality of adhesive joints. This is because in the study of fracture mechanics, the focus on the formation and propagation of cracks is essentially important.…”

Section: Introductionmentioning

confidence: 99%

Adhesion Analysis of Adhesive Mortar Joints in Ceramic Tiles under Static Loading

Silva,

Torres,

Silva

et al. 2024

Buildings

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Ceramic detachment is a serious problem that persists in modern building constructions despite technological advances and updated regulatory documents. Most of these detachments occur at the interface between the adhesive mortar and the ceramic tile, due to the action of simultaneous tensile and shearing efforts. However, despite this understanding, experimental studies that evaluate the integrity of the adhesion of façades covering materials subjected to simultaneous stress are scarce. In this sense, this study proposes to evaluate the integrity of adhesive mortar joints using the mixed-mode flexure (MMF) crack propagation test. Force and elastic and dissipated energy data were used in this analysis. Prismatic specimens, with a size of 160 × 40 mm2 and a thickness of 6 mm, were produced consisting of two ceramic plates joined by a layer of adhesive mortar at 5 ± 0.5 mm. An acetate film was inserted into one of the mortar–ceramic interfaces in order to simulate the presence of a previous crack, and different crack sizes were used. The results showed the high stress-concentrating effect that the existence of flaws in the interface region has on fracture resistance, as well as the importance of effective contact between the materials. The energy parameters confirmed the analyses carried out based on the load values. The elastic energy of the system fell in the cracked samples, showing that there is a close relationship between the interface energy and the adhesive strength of the material. An energy release of the order of 0.053 ± 0.031 J was required for a 15 mm crack to propagate, creating a fracture surface.

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Numerical simulations of crack propagation tests in adhesive bonded joints

Cited by 9 publications

References 8 publications

Bonded repair of composite structures in aerospace application: a review on environmental issues

Bonded repair of composite structures in aerospace application: a review on environmental issues

Evaluation of structural adhesive joints fracture toughness without crack measurement

Adhesion Analysis of Adhesive Mortar Joints in Ceramic Tiles under Static Loading

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