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Study of Shear Dominant Delamination in Thin Brittle-High Ductile Interface
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. (Model Driven Development and Decision Support)ORCID iD: 0000-0002-1162-7023
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. (Model Driven Development and Decision Support)
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. (Model Driven Development and Decision Support)
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. bShanghai Second Polytechnic Univ., 201209, Shanghai, China. (Model Driven Development and Decision Support)
2016 (English)In: Procedia Structural Integrity / [ed] Francesco Iacoviello, Elsevier, 2016, Vol. 2, 152-157 p.Conference paper (Refereed)
Abstract [en]

Thin laminates of Aluminum (Al) foil and Low Density Polyethylene (LDPE) film are essential constituents of food packages where these two substrates are bonded together with a thin layer of LDPE acting as adhesive. Noticeably, Al is a low ductile/quasi brittle material, whereas LDPE is highly ductile. The mechanism of delamination and strength of bond between the interfaces dictates the continuum and damage behavior of this composite. However, measuring the shear delamination properties is challenging as conventional test methods have limitations when the substrates are very thin and flexible. This study explains a tentative method that uses uniaxial tensile testing on the pre-cracked specimen of this composite to find energy dissipation due to shear delamination and successfully uses it in Finite Element Simulation in Abaqus. The delamination was observed in a narrow strip-like region close to fracture surfaces and measured with special visualization aid. A similar response was found in FEM simulation. Scanning Electron Microscopic (SEM) study of delaminated interface confirms the delamination to be shear in nature. In a cohesive zone modeling in Abaqus, the measured shear delamination energy was used as input parameter along with an arbitrary bi-linear cohesive law for validation of the experimental measurement.

Abstract [sv]

Tunna laminat av aluminium (Al) folie och lågdensitetspolyeten (LDPE) film är väsentliga beståndsdelar i livsmedelsförpackningar, där dessa två substrat är sammanbundna med ett tunt skikt av LDPE som fungerar som bindemedel. Märkbart är Al en låg segt / kvasi sprött material, medan LDPE är mycket formbart. Mekanismen för delaminering och styrka bindningen mellan gränssnitten dikterar kontinuum och skador beteende denna komposit. Men mäta skjuvning delamineringsegenskaper är utmanande som konventionella testmetoder har begränsningar när substraten är mycket tunn och flexibel. Denna studie förklarar en preliminär metod som använder enaxlig dragprovning på förhand spruckna exemplar av denna komposit för att hitta energiupptagning på grund av skjuvning delaminering och framgångsrikt använder den i finita elementsimulering i Abaqus. Delamineringen observerades i en smal remsliknande region nära brottytor och mättes med särskild visualisering stöd. Ett liknande svar återfanns i FEM simulering. Svepelektronmikroskop (SEM) studie av delaminerat gränssnitt bekräftar delaminering att vara skjuvning i naturen. I en sammanhängande zon modellering i Abaqus, var den uppmätta skärdelaminering energi som används som inparameter tillsammans med en godtycklig bilinjär sammanhängande lag för validering av experimentella mätningen.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 2, 152-157 p.
Keyword [en]
Interlaminar shear delamination; thin flexible substrate; composite; cohesive zone modeling; work of fracture; tensile testing
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:bth-12996DOI: 10.1016/j.prostr.2016.06.020OAI: oai:DiVA.org:bth-12996DiVA: diva2:958210
Conference
21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy
Note

Open access

Available from: 2016-09-06 Created: 2016-09-06 Last updated: 2016-09-09Bibliographically approved

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Islam, Md. ShafiqulZhang, DefengMehmood, NasirKao-Walter, Sharon
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