We propose new methods of static and dynamic (in a pendulum impact testing machine) testing of thin-sheet materials in the process of tear (antiplane shear strains, i.e., mode III fracture) aimed at the evaluation of fracture toughness G_IIIc. Stable values of this characteristic are obtained for some aluminum alloys and steels. The proposed testing methods are simple, do not require special equipment, and can easily be realized under the conditions of industrial laboratories.
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