Strain gauging for accurate determination of K and G in impact tests

• Published in: Journal of materials science Vol. 26; no. 8; pp. 2124 - 2132
• Main Authors: DEAR, J. P, MACGILLIVRAY, J. H
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 15.04.1991
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); Measurement and testing methods; Physics; Solid mechanics; Structural and continuum mechanics; Resistance strain gauge; Ultrahigh speed photography; Stress intensity factor; Measurement method; Experimental study; Impact test; Energy relaxation
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF00549178

This paper reports research using on-specimen strain-gauge sensors for impact testing of nonmetallic specimens. Comparisons are made between force-time traces from sensors on the specimen and those located on the striker. Observations are made as to how the stresses relate to the fast crack in the core of the material specimen and those acting on the surface of the material about the crack, and also those acting on the plastic hinge formed on the compression side of the specimen. Optical and scanning electron microscopic studies are made of the crack surfaces, and high-speed photography is used to observe the crack propagation in specimens with and without side-grooves to guide the crack and increase constraint. (Author)