caa a22 4500 465751156 CHVBK 20180323111834.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF02410249 doi (NATIONALLICENCE)springer-10.1007/BF02410249 Measurement of mixed-mode crack profiles by holographic interferometry [Elektronische Daten] [A. Maji, S. Shah] Holographic interferometry was used to study the mixed-mode fracture characteristics of mortar. The nature of crack propagation in such quasibrittle materials and the theoretical model used to interpret the experimental results indicated that a highly sensitive measurement technique was required. The gradual curvature of the propagating crack at different sections of the specimen necessitated full-field observation capability. The nature of the problem made holographic interferometry the ideal technique for this application. To measure the in-plane components of the opening and sliding of the crack surfaces during propagation, a single holographic plate was placed very close to the specimen. This allowed four independent observations of any point on the specimen from the four corners of the plate without any need for additional optics of exposures. Double-exposure holograms were made at different crack-propagation stages. The developed plate was illuminated by an unexpanded reference beam to form a real image of the object and observe displacement fringes. Fringe data were interpreted by using computer software written for this research. Society for Experimental Mechanics, Inc., 1990 Maji A. Department of Civil Engineering, University of New Mexico, 87131, Albuquerque, NM aut Shah S. Department of Civil Engineering, Northwestern University, 60208, Evanston, IL aut Experimental Mechanics Kluwer Academic Publishers 30/2(1990-06-01), 201-207 0014-4851 30:2<201 1990 30 11340 https://doi.org/10.1007/BF02410249 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02410249 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Maji A. Department of Civil Engineering, University of New Mexico, 87131, Albuquerque, NM aut NATIONALLICENCE 700 1- Shah S. Department of Civil Engineering, Northwestern University, 60208, Evanston, IL aut NATIONALLICENCE 773 0- Experimental Mechanics Kluwer Academic Publishers 30/2(1990-06-01), 201-207 0014-4851 30:2<201 1990 30 11340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer