On the influence of microcantilever pre-crack geometries on the apparent fracture toughness of brittle materials. (1st September 2017)

• Record Type: Journal Article
• Authors: Brinckmann, Steffen; Matoy, Kurt; Kirchlechner, Christoph; Dehm, Gerhard
• Is Part Of: Acta materialia. Volume 136(2017)
• Page Start: 281
• Page End: 287
• Publication Date: 2017-09-01
• Subjects: Micromechanics -- Stress intensity factor -- Fracture; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2017.07.014
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Focused ion beam machined microcantilevers are frequently used for fracture mechanics analysis of inhomogeneous solids at the micrometer scale. A finite element method study about the influence of the pre-crack geometry on the apparent fracture toughness is provided. We discuss the influence of material bridges and the effect of rounded pre-crack corners when two dimensional models are employed to evaluate the fracture toughness. We conclude with a guideline for introducing an optimized pre-crack. Graphical abstract: