Fracture tests were performed on sandstone specimens under three-point bending with a variety of notch positions to achieve KII/KI = 0???12%. At peak load, the maximum crack opening displacement measured by digital image correlation was 45 lm under mixed mode loading and 30 lm under mode I, and these values were used to determine the length of the cohesive zone: 10???12 mm for mixed mode and 5???7 mm for mode I. For mixed mode fracture, the displacement in the cohesive zone was identified to be opening only, while sliding and opening were detected along the remaining length.

Opening and mixed mode fracture processes in a quasi-brittle material via digital imaging

BIOLZI, LUIGI;
2014

Abstract

Fracture tests were performed on sandstone specimens under three-point bending with a variety of notch positions to achieve KII/KI = 0???12%. At peak load, the maximum crack opening displacement measured by digital image correlation was 45 lm under mixed mode loading and 30 lm under mode I, and these values were used to determine the length of the cohesive zone: 10???12 mm for mixed mode and 5???7 mm for mode I. For mixed mode fracture, the displacement in the cohesive zone was identified to be opening only, while sliding and opening were detected along the remaining length.
Mixed mode fracture; Cohesive zone Digital image correlation (DIC) Quasi-brittle material Fracture initiation and propagation
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/883028
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