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Continuum damage modelling of environmental degradation in joint bonded with E32 epoxy adhesive

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Organization
Abstract
A mesh-independent continuum damage model has been proposed to predict the residual strength of adhesively-bonded joints by introducing a displacement-based damage parameter into the constitutive equation of the damaged materials. This approach was originally developed for EA9321-bonded single-lap joints and this paper extends it to butt joints bonded with a different ductile adhesive (E32). This involves not only a different adhesive and joint configuration but the high hydrostatic stress requires a more realistic yielding model. A dry and a partially saturated steel joint were used to calibrate the moisture dependent damage parameters of the adhesive E32, and then these parameters were used without further modification to predict the failure of the other environmentally degraded steel butt joints and the aluminum butt joints. The FEA package ABAQUS was used to implement the coupled mechanical-diffusion analyses required. A von Mises yield model was used initially. Then, a linear Drucker-Prager plasticity model was used, as this could incorporate the hydrostatic stress dependency found in the adhesive. The predicted joint residual strengths agreed well with the corresponding experimental data, which exhibited a significant reduction in strength on exposure to moisture but still retained a cohesive failure mode in the adhesive. The mesh independence of the model was also demonstrated.
Keywords
joint durability, continuum damage, FEA, progressive failure, life prediction, FRACTURE, SIMULATION, BEHAVIOR, FAILURE, GROWTH

Citation

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Chicago
Hua, Y, AD Crocombe, Magd Abdel Wahab, and IA Ashcroft. 2007. “Continuum Damage Modelling of Environmental Degradation in Joint Bonded with E32 Epoxy Adhesive.” Journal of Adhesion Science and Technology 21 (2): 179–195.
APA
Hua, Y., Crocombe, A., Abdel Wahab, M., & Ashcroft, I. (2007). Continuum damage modelling of environmental degradation in joint bonded with E32 epoxy adhesive. JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, 21(2), 179–195.
Vancouver
1.
Hua Y, Crocombe A, Abdel Wahab M, Ashcroft I. Continuum damage modelling of environmental degradation in joint bonded with E32 epoxy adhesive. JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY. 2007;21(2):179–95.
MLA
Hua, Y, AD Crocombe, Magd Abdel Wahab, et al. “Continuum Damage Modelling of Environmental Degradation in Joint Bonded with E32 Epoxy Adhesive.” JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY 21.2 (2007): 179–195. Print.
@article{784896,
  abstract     = {A mesh-independent continuum damage model has been proposed to predict the residual strength of adhesively-bonded joints by introducing a displacement-based damage parameter into the constitutive equation of the damaged materials. This approach was originally developed for EA9321-bonded single-lap joints and this paper extends it to butt joints bonded with a different ductile adhesive (E32). This involves not only a different adhesive and joint configuration but the high hydrostatic stress requires a more realistic yielding model. A dry and a partially saturated steel joint were used to calibrate the moisture dependent damage parameters of the adhesive E32, and then these parameters were used without further modification to predict the failure of the other environmentally degraded steel butt joints and the aluminum butt joints. The FEA package ABAQUS was used to implement the coupled mechanical-diffusion analyses required. A von Mises yield model was used initially. Then, a linear Drucker-Prager plasticity model was used, as this could incorporate the hydrostatic stress dependency found in the adhesive. The predicted joint residual strengths agreed well with the corresponding experimental data, which exhibited a significant reduction in strength on exposure to moisture but still retained a cohesive failure mode in the adhesive. The mesh independence of the model was also demonstrated.},
  author       = {Hua, Y and Crocombe, AD and Abdel Wahab, Magd and Ashcroft, IA},
  issn         = {0169-4243},
  journal      = {JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY},
  keyword      = {joint durability,continuum damage,FEA,progressive failure,life prediction,FRACTURE,SIMULATION,BEHAVIOR,FAILURE,GROWTH},
  language     = {eng},
  number       = {2},
  pages        = {179--195},
  title        = {Continuum damage modelling of environmental degradation in joint bonded with E32 epoxy adhesive},
  url          = {http://dx.doi.org/10.1163/156856107780437444},
  volume       = {21},
  year         = {2007},
}

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