SYMPOSIA PAPER Published: 01 January 1986

A Compact Mode II Fracture Specimen


A compact Mode II fracture specimen together with its loading frame is analyzed and tested. This system is a further development of an earlier circular Mode II fracture specimen presented by the authors. For fatigue precracking in two different loading configurations, formulas relating the Mode I stress intensity factor, applied load, and specimen geometry are developed. In order to determine KIIc from the fracture load, a relationship between KII, the applied load, and specimen/loading frame geometry is obtained. All of these relations are calculated by means of the finite element method.

These formulas are then employed to perform a series of Mode II fracture toughness tests with Perspex (also called Plexiglas or polymethyl methacrylate [PMMA]). The average measured KIIc value was 0.94 MPa√m. The KIc tests were performed with the compact tension specimen, yielding KIc = 1.06 MPa√m; thus KIc/KIIc was found to be 1.127. In addition, crack propagation angles were found to be between 63 and 70°. These results are compared with the maximum tangential stress and maximum tangential principal stress criteria.

Author Information

Banks-Sills, L
Tel-Aviv University, Ramat-Aviv, Tel-Aviv, Israel
Arcan, M
Tel-Aviv University, Ramat-Aviv, Tel-Aviv, Israel
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Developed by Committee: E08
Pages: 347–363
DOI: 10.1520/STP17406S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3