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Study of Shear Dominant Delamination in Thin Brittle-High Ductile Interface
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik. (Tetra Pak)ORCID-id: 0000-0002-1162-7023
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik. (Tetra Pak)
2015 (engelsk)Inngår i: National Agency for Finite Element Methods and Standards (NAFEMS), 2015Konferansepaper, Oral presentation with published abstract (Annet (populærvitenskap, debatt, mm))
Abstract [en]

Thin laminates of Aluminum (Al) and Low Density Polyethylene (LDPE) is an essential constituent 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 behaviour of this composite. However, measuring the shear delamination is challenging as conventional test methods have limitations when the substrates are very thin. This study explains a method that uses uniaxial tensile testing on the pre-cracked specimen of this composite to find energy dissipation due to shear delamination and successfully use it in Finite Element Simulation in Abaqus. The delamination was observed in a narrow strip region close to fracture surfaces and measured with special visualization aid. Similar response was found in FEM simulation. Scanning Electron Microscopic (SEM) study of delaminated interface confirms the domination of shearing. In a cohesive zone modelling in Finite Element Simulation software, the shear delamination energy was used as input parameter along with an arbitrary bi-linear cohesive law. The substrates’ constitutive response was modelled considering non linear plasticity and softening. Finally proposed delamination energy separation method was validated with comparison between the physical tests and FEM simulations.

sted, utgiver, år, opplag, sider
2015.
Emneord [en]
Shear Dlamination, Thin Packaging Material, Composites, Cohesive Zone Modelling, Finite Element Simulation, Tensile Testing
HSV kategori
Identifikatorer
URN: urn:nbn:se:bth-11607OAI: oai:DiVA.org:bth-11607DiVA, id: diva2:900613
Konferanse
NORDIC Seminar: Simulating Composite Materials and Structures, Stockholm
Tilgjengelig fra: 2016-02-04 Laget: 2016-02-04 Sist oppdatert: 2016-02-05bibliografisk kontrollert

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