A Dilatational-Interface Model for Bond


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Title: A Dilatational-Interface Model for Bond

Author(s): J.V. Cox

Publication: Special Publication

Volume: 180


Appears on pages(s): 81-104

Keywords: Bond model; dilatation; interface; mechanics; phenomenological; i plasticity; pull-out; splitting (cracking); validation

Date: 10/1/1998

A bond model is presented that uses an interface idealization of the bond phenomena and incorporates dilation to characterize the wedging effect of the ribs. Since this type of model can potentially predict both pull-out and splitting failures, it may provide an approach for characterizing the observed experimental response of bond specimens in a form that can be used to better understand the progressive failure of complicated structural components. Using the mathematical framework of plasticity theory, the model is defined to characterize the effects of damage in the region near the bar. The form of the model is based upon experimental results that include a variation of the confinement stress; thus, the model fully couples the tangent and normal response so that it: (1) exhibits a sensitivity to the confinement stress and (2) produces longitudinal cracking in models of bond specimens. Validation problems based on experiments from several research groups are considered to highlight the strengths and weaknesses of the model. The model reproduces the experimental data with acceptable accuracy using a single calibration, but the results also suggest that the limitations of the interface idealization merit further investigation.