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Abstract
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Adhesively bonded joints are widely used in engineering domains due to their capability to withstand different
thermal and mechanical loads. In this paper, creep deformations of double lap adhesive joints under mechanical
and thermal loads are investigated experimentally and numerically. For this aim, specimens of bulk adhesive are
utilized in order to investigate the creep behavior and constitutive parameters of the material. The Power-law
model is improved and used to simulate the creep behavior of the adhesive at a variety of stress and temperature
levels. The modified model is defined in ABAQUS with a user defined subroutine UMAT written in FORTRAN, in
order to simulate the creep deformations of the joints through finite element-based numerical analyses. In order
to verify the accuracy of the finite element process, three double lap specimens with aluminum adherends are
tested under several stress and temperature levels, and creep deformations are also measured. The results show
that applying the modified Power-law model can accurately predict the creep deformations of the adhesively
bonded joints.
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