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Experimental Methods for Three-Dimensional Mixed Mode Fracture

Experimental methods that can be used in three-dimensional mixed mode fracture researches are investigated. The methods are capable of determining the initiation load, maximal load, crack tip opening displacement, crack tip slipping displacement and initiation angle of the mixed mode crack simply and conveniently. As an example, the effect of thickness on mixed-mode I/II fracture of a kind of aluminum alloy is revealed by the methods.