Fracture Toughness Testing of Non Standard Specimens

Document type: Researchreports
Full text:
Author(s): Etienne Mfoumou, Sharon Kao-Walter
Title: Fracture Toughness Testing of Non Standard Specimens
Series: Research Report
Year: 2004
Issue: 5
ISSN: 1103-1581
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för teknik – avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
Authors e-mail:
Language: English
Abstract: The fracture behavior of the main layers used in food packaging material is studied. Investigations include aluminium foil (9μm), paper board (100 μm) and Low Density Polyethylene (27 μm). The plane stress fracture toughness of each layer is derived based on a centered crack panel. Different crack sizes have been tested. A compromise (crack length) was found, at which Strip Yield Model as well as Linear Elastic Fracture Mechanics allow the validation of experimental results. Meanwhile, accurate results are obtained using the Strip Yield Model with a geometric correction. The result is also used to evaluate crack initiation from a notch when all three layers are laminated.
Subject: Mechanical Engineering\Structural Mechanics
Mechanical Engineering\General
Keywords: fracture, strip yield model, packaging material
URN: urn:nbn:se:bth-00256