ISSN: 0090-3973
Page Count: 4

A Fracture Test Method for Mode I Fracture Of Thin Metal Materials

Cotterell, B
Visiting professor,School of Mechanical and Production Engineering, Nanyang Technological University,

Sim, MC
Matcor Technology & Services Pte. Ltd.,

Amrutharaj, G
Graduate student and associate professor,National University of Singapore,

Teoh, SH
Graduate student and associate professor,National University of Singapore,

(Received 8 May 1995; accepted 22 April 1996)

Abstract

A method of testing Mode I K dominated fractures in thin materials using a constrained short center notched tension specimen that is clamped along the loaded edge is described. Poisson's effect induces a lateral tension on the specimen that eliminates the buckling problems associated with thin materials. Furthermore, the stress intensity factor over a significant range of crack lengths and specimen geometries is dependent only on the nominal strain, making the test very suitable for crack-growth experiments under a constant-stress intensity factor. A very accurate approximate expression for the stress intensity factor is presented. A test using this method to measure the crack-growth resistance of Kapton 300HN polyimide film is described.

Keywords:
thin materials, Mode I fracture testing, fracture toughness, crack-growth resistance, fatigue crack growth, time-dependent fracture, polyimide film

Paper ID: JTE11309J
DOI: 10.1520/JTE11309J
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