A suggested test procedure to measure mixed mode I-III fracture toughness of brittle materials

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Testing and Evaluation; (United States)

OSTI ID:7176196

Kumar, A M; Hirth, J P; Hoagland, R; Feng, X ^[1]

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1. Washington State Univ., Pullman, WA (United States). Dept. of Mechanical and Materials Engineering

This article describes a test procedure to measure mixed mode I-III fracture toughness. The traditional compact tension specimen geometry is modified to include an aged crack slot. This angle is varied to produce various mode I/mode III ratios. A further modification to the specimen design involving two crack fronts in a triple pantleg'' configuration that can produce near-mode III loading at the crack tip is also described. Together, these two specimens can be used to test the entire spectrum of combined mode I-III. Results of mixed mode fracture tests on 2034 aluminum alloys using these specimens are presented. A three-dimensional (3-D) finite element model of the modified compact specimen to validate the analytical procedure is also described. Angular correction factors for the mixed mode case are also presented. The results indicate the feasibility of developing in new standard test method to measure mixed mode fracture toughness in macroscopically brittle metallic materials.

• OSTI ID: 7176196
• Journal Information: Journal of Testing and Evaluation; (United States), Journal Name: Journal of Testing and Evaluation; (United States) Vol. 22:4; ISSN JTEVAB; ISSN 0090-3973
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500* -- Engineering-- Materials Testing
ALLOYS
ALUMINIUM ALLOYS
CRACK PROPAGATION
FRACTURE PROPERTIES
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
STRESS INTENSITY FACTORS
TESTING