Multiscale strategy for modelling the mechanical performance of hook and loop fasteners based on a detachment process zone model

Vanessa Restrepo Perez, Purdue University

Abstract

There is a strong demand for new computational models that will help the design and manufacturing of hook and loop fastening products, these models can be significantly shorten the design and production cycles by providing a quick turnaround time with minimal prototyping and testing. Three dimensional micro-mechanical model was created to calculate the forces and energy requires for the attachment/detachment cycle using a Representative Hook and Loop Element (RHLE). An algorithm generate the fibrous surface taking into account the random variation on the geometrics parameters of the material. A tensile set of experimental data as well as the use of ESEM imaging were generated in order to characterize the mechanical behavior of polypropylene microfibers that are part of a multilayer material. Triangular and User-defined cohesive zone model were employed to characterize the mechanical behavior of the interface in hook and loop fasteners when are peeled off; comparison between numerical and experimental results showed that the shape of the cohesive law plays an important role in the overall test performance. Experimental and numerical peel tests were created to validate the accuracy of the multiscale model here proposed. As design and predictive tools, the computational model enable quick changes in the design parameters and virtually test the performance of the new fastener. The model accurately capture the mechanical performance of the fastening joint given geometrical description and material information of the hook and loops.

Degree

M.S.E.

Advisors

Zavattieri, Purdue University.

Subject Area

Engineering|Materials science|Computer science

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