Characterization of Structural Epoxy Adhesives

Trimiño, Luis F.; Cronin, Duane S.; Dailey, Mary M. Caruso

doi:10.1007/978-3-319-06995-1_28

Cited by 1 publication

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“…8), and the stress transformation (using von Mises theory) confirms that the strain rate effect is clearly not the same between the tensile and the shear data. As a result, complex concave yield surfaces may be required to properly capture and predict the yield behavior under load [73].More elaborate test apparatus (e.g. the modified Arcan [23,91]) that can subject the samples to mixed mode loading, will be required to fully define the actual yield surface.…”

Section: Discussion Experimental Testingmentioning

confidence: 99%

“…In general, the experimental test results determined that the constitutive model was required to incorporate elastic response, damage or plastic response, deformation rate effects, asymmetry in tension and compression, and shear response. Although many different models exist with some or all of these aspects, noted limitations included incorporation of deformation rate effects, the asymmetric yield surface [73], and the general ability to fit the wide range of data available from the experimental tests. Following investigation of several different models, the Semi-Analytical model for Polymers (SAMP-1) constitutive model developed by Kolling et.…”

Section: Adhesive Modeling and Cae Implementationmentioning

confidence: 99%

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Evaluation of Numerical Methods to Model Structural Adhesive Response and Failure in Tension and Shear Loading

Trimiño

Cronin

2016

J. dynamic behavior mater.

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Improved energy efficiency in transportation systems can be achieved with multi-material lightweight structures; however, joining often requires the use of adhesive bonding and design efforts are challenged by the paucity of data required to represent adhesives in numerical models. The data for three epoxy structural adhesives tested in tension and shear over a range of strain rates (0.001-1000 s-1) is reported. The range of experimentation addresses regular operation and extreme conditions (crash scenarios) for vehicles. The data was implemented with cohesive and solid elements; and the models were assessed on their ability to reproduce adhesive material response. Good agreement was achieved using both approaches. In average the coefficients of determination (r 2) between measured experimental response and simulations were 0.81 for tension and 0.59 for shear, with 2 % difference in the prediction of stress at failure. The cohesive formulation was computationally efficient and reproduced rate effects, but was limited in representing the response of the non-toughened epoxy. The solid element formulation required longer simulation times, but yielded similar accuracy for tension (2 % difference in stress to failure and r 2 values of 0.98, on average). However, the shear response accuracy (r 2 = 0.53) was reduced by coupling between shear and tension strain rate effects. Numerical simulation of structural adhesives requires constitutive models capable of incorporating uncoupled deformation rate effects on strength. The results of this study indicate that a cohesive model can provide adequate representation of an adhesive joint for tensile and shear loading across a range of deformation rates.

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Section: Discussion Experimental Testingmentioning

confidence: 99%

Section: Adhesive Modeling and Cae Implementationmentioning

confidence: 99%