Mechanics of edge-cracking and toughness determination for strain-locking composite materials

Nicholas Payne, Kishore Pochiraju

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper, we describe the mechanics of edge cracking and methods for determining the fracture toughness of strain locking materials using homogenized constitutive models for strain locking materials. We implemented a thermodynamically consistent constitutive model for a strain locking material into a plane stress finite element model and determined the energy release rate for a single-edge cracked configuration. Using material parameters suitable for a copper-clad polymer flexible circuit board and for a biological material, we determined the relationship between the strain energy release rate and the crack length for an applied load history using crack-advance methodology. The change of total potential energy (П = - (U-W)) as an edge crack propagates through a prismatic bar loaded in tension is determined. A polynomial is fitted to П where U is the total strain energy stored and W is the work done by the external loads for the purpose of differentiating with respect to the crack length, a. The energy release rate, G, is derived from the slope Πas a function of crack length from these numerical results. Additionally, an additively manufactured strain locking composite material specimen is produced and tensile tested. The results are used to fit the material constants to a previously derived implicit nonlinear elastic model.

Original languageEnglish
Title of host publication33rd Technical Conference of the American Society for Composites 2018
Pages577-591
Number of pages15
ISBN (Electronic)9781510872073
StatePublished - 2018
Event33rd Technical Conference of the American Society for Composites 2018 - Seattle, United States
Duration: 24 Sep 201827 Sep 2018

Publication series

Name33rd Technical Conference of the American Society for Composites 2018
Volume1

Conference

Conference33rd Technical Conference of the American Society for Composites 2018
Country/TerritoryUnited States
CitySeattle
Period24/09/1827/09/18

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