Representativity of thermal stresses in designing composite joints based on singular stress states at multimaterial corners

Barroso, Alberto; Vicentini, Daniane Franciesca; Parı́s, F.; Mantič, V.

doi:10.1016/j.compositesa.2011.04.013

Cited by 12 publications

(8 citation statements)

References 27 publications

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“…( 22) from equation ( 21) tends to overestimate the residual stress values, as pointed out by [226] and also observed experimentally in . [227] In [227] two simple experiments were conducted to check the potential residual stress field developed in the cooling stage of the curing process. A composite-metal single-lap joint was bonded using an adhesive curing at T c = 115°C.…”

Section: Additional Considerationsmentioning

confidence: 99%

“…The stress fields are completely different when considering the expected ΔT = T c -T amb = 115-25 = 90°C than those obtained when considering lower ΔT values. This lower ΔT are completely equivalent to testing the joint at temperatures above the room temperature, and those test were carried out in [227] finding absolutely no significant influence in the failure load or failure path (considering detailed failure path observations at the critical part of the joint). These experimental findings indicate that the expected residual stress profile has not fully developed, maybe due to the relaxation effects mentioned in [225] in presence of high stress gradients and to the viscoelastic behaviour of the adhesive.…”

Section: Additional Considerationsmentioning

confidence: 99%

“…Another experiment carried out in [227] investigated time-dependent relaxation effects in 24 samples of the same single-lap joint configuration which were bonded and tested at equal intervals of time (in a logarithmic scale) from just 15 minutes after the curing stage (the necessary time to prepare the sample) to a 7 months later. The two bonded materials had different TEC and the adhesive was cured at temperature, letting the expected residual stress state to develop.…”

Section: Additional Considerationsmentioning

confidence: 99%

See 2 more Smart Citations

A review on failure theories and simulation models for adhesive joints

Τσερπές

Barroso-Caro

Carraro

et al. 2021

The Journal of Adhesion

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In the framework of the Cost Action CERTBOND (Reliable roadmap for certification of bonded primary structures), a wide group of researchers from 27 European Countries have had the opportunity to work on the topic of certification of bonded joints for primary structural applications from different engineering sectors such as the aerospace, automotive, civil engineering, wind energy and marine sectors. Since virtual testing and optimization are basic tools in the certification process, one of the key objectives of CERTBOND is to critically review some of the available models and failure theories for adhesive joints. The present paper summarizes the outcome of this task. Nine different models/theories are described in detail. Specifically, reviewed are the Classical Analytical Methods, the Process Zone Methods, Linear Elastic Fracture Mechanics (LEFM), the Virtual Crack Closure Technique (VCCT), the Stress Singularity Approach, Finite Fracture Mechanics (FFM), the Cohesive Zone Method (CZM), the Progressive Damage Modeling method and the Probabilistic methods. Also, at the end of the paper, the modeling of temperature effects on adhesive joints have been addressed. For each model/theory, information on the methodology, the required input, the main results, the advantages and disadvantages and the applications are given.

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Section: Additional Considerationsmentioning

confidence: 99%

Section: Additional Considerationsmentioning

confidence: 99%

Section: Additional Considerationsmentioning

confidence: 99%

See 1 more Smart Citation

A review on failure theories and simulation models for adhesive joints

Τσερπές

Barroso-Caro

Carraro

et al. 2021

The Journal of Adhesion

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“…By utilizing the Stroh formalism, Hwu and Lee derived analytically a closed‐form solution for the orders of stress and heat flux, together with the temperature, displacement, and stress fields of multibonded anisotropic wedges. Barroso et al and Nomura et al investigated numerically the singular stress states near the vertex of multimaterial corners under thermal loading. Abe et al calculated the stress intensity factor of interfacial corner between anisotropic piezoelectric multimaterials using a combination of the Stroh formalism and the Williams eigenfunction method.…”

Section: Introductionmentioning

confidence: 99%

Determination of high‐order fields for multianisotropic material antiplane V‐notches and inclusions by the asymptotic expansion technique and an overdeterministic method

Yao

Zappalorto

Cheng

et al. 2020

Fatigue Fract Eng Mat Struct

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In this paper, the singular behavior for anisotropic multimaterial V-notched plates is investigated under antiplane shear loading condition. Firstly, the elastic governing equations are transformed into eigen ordinary differential equations through introducing the asymptotic expansions of displacements near the notch tip. The stress singularity exponents, including the higher-order terms, and the corresponding eigen angular functions are then obtained by solving the established equations by using the interpolating matrix method.Thus, using the combination of the results from finite element analyses and the derived asymptotic expansion, an overdeterministic method is employed to calculate the amplitudes of the coefficients in the asymptotic expansions.Finally, the stress and displacement fields in the vicinity of the notch tip, consisting of both singular terms and higher-order terms, are determined.The effects of material properties and geometry characteristic on the singular behaviour of the notch tip are discussed in detail. K E Y W O R D Santiplane V-notch, eigen analysis, finite element method, higher-order terms, multimaterial

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“…Although thermal stresses have been reported to have a significant influence on the behaviour of adhesive joints between dissimilar materials [21], the stresses being actually more severe in the Double Lap Joint (DLJ) than in the BT specimen, thermal analysis has not been included in the present work, following previous experience in similar corner geometries [22].…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack initiation and damage characterization in Brazilian test specimens for adhesive joints

Vicentini

Crocombe

Barroso

et al. 2012

Journal of Adhesion Science and Technology

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The present study is focused on the fatigue failure initiation at bimaterial corners by means of a configuration based on the Brazilian disk specimens. These specimens were previously used for the generalized fracture toughness determination and prediction of failure in adhesive joints, carried out under static compressive loading. Under static loading, local yielding effects might affect the asymptotic two-dimensional linear elastic stress representation under consideration.Fatigue loading avoids this fact due to the lower load levels used. The tests were performed using load control; video microscopy and still cameras were used for monitoring initiation and crack growth. The fatigue tests were halted periodically and images of the corner were taken where fatigue damage was anticipated. Damage initiation and subsequent crack growth were observed in some specimens, especially in those which presented brittle failure under static and fatigue tests.These analyses allowed the characterization of damage initiation for a typical bimaterial corner that can be found in composite to aluminium adhesive lap joints.

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Representativity of thermal stresses in designing composite joints based on singular stress states at multimaterial corners

Cited by 12 publications

References 27 publications

A review on failure theories and simulation models for adhesive joints

A review on failure theories and simulation models for adhesive joints

Determination of high‐order fields for multianisotropic material antiplane V‐notches and inclusions by the asymptotic expansion technique and an overdeterministic method

Fatigue crack initiation and damage characterization in Brazilian test specimens for adhesive joints

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