What is it about?
The paper presents an experimental test strategy for the identification of Mode-III cohesive fracture energy. It employs a recently developed experimental device; so far experiments concern transparent, Polymethyl-methacrylate specimens since the test purpose is to investigate the device accuracy and reliability.
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Why is it important?
The structural analysis of bonded assemblies requires the definition of the cohesive region’s constitutive features by means of the energy released by the fracture process; the debonding process is usually investigated through three different “fracture modes”, each one corresponding to a specific load scheme. Mode III (anti-plane shear) fracture energy experimental measurement is usually performed via difficult indirect approaches. The presented test is easy to be performed and is able to identify the pure mode III behavior without any contamination by mode I (normal force) and II (plane-shear) phenomena.
Perspectives
The test results presented in this paper are very encouraging. The device proved to be reliable, easy to be used and the provided data are stable; thus, the presented approach results very appealing. Further investigations employing different materials could make the test reliable enough to be established as experimental standard for Mode-III fracture energy detection. Moreover, the characterization of coherent finite elements could open new perspectives about both the data interpretation and their use in structural analysis.
Dr Salvatore Sessa
Universita degli Studi di Napoli Federico II
Read the Original
This page is a summary of: A novel fixture for measuring mode III toughness of bonded assemblies, Engineering Fracture Mechanics, April 2015, Elsevier,
DOI: 10.1016/j.engfracmech.2015.03.019.
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