caa a22 4500 388019964 CHVBK 20180307124921.0 cr unu---uuuuu 161130e199804 xx s 000 0 eng 10.1557/JMR.1998.0141 doi S0884291400043788 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0141 Thin film scratch testing in two dimensions—Experiments and analysis [Elektronische Daten] We have modified the microscratch test to create a near plane strain loading condition. In the Microwedge Scratch Test (MWST), a wedge-shaped diamond indenter tip is drawn along a fine line (i.e., narrow strip of film), while simultaneously being driven into the line. We compare microwedge scratching of zone 1 (voided grain boundaries) and zone T (metallurgical grain boundaries) thin film specimens of sputtered tungsten on thermally grown SiO2. Symptomatic of its weak grain boundaries, the zone 1 film displays three separate crack systems. Because of its superior grain boundary strength, the zone T film displayed only one of these—an interfacial crack system. By correlating fracture phenomena to signature events in the load-displacement curve, we develop governing equations for propagating interfacial cracks, including expressions for strain energy release rate, bending strain, and mode mixity. Grain boundary fracture causes zone 1 films to spall before a stable crack is formed. Zone T films survive the bending strains, and hence adhesions may be inferred from stable crack growth mechanics. We conclude by contrasting and comparing experimental results for plane strain indentation versus plane strain scratching. Copyright © Materials Research Society 1998 de Boer Maarten P. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 Nelson John C. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 Gerberich William W. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 Journal of Materials Research Cambridge University Press 13/4(1998-04), 1002-1014 0884-2914 13:4<1002 1998 13 JMR https://doi.org/10.1557/JMR.1998.0141 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0141 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Boer Maarten P. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 NATIONALLICENCE 700 1- Nelson John C. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 NATIONALLICENCE 700 1- Gerberich William W. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/4(1998-04), 1002-1014 0884-2914 13:4<1002 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge