Abstract
The different concepts of the reason for the effect of loading rigidity on mechanical characteristics are analyzed, i.e., the energy- and the deformation rate-based concepts and the concept connecting the effect of loading rigidity with disturbance of similarity in loading while carrying out the tests. Based on an analytical expression obtained by the author, it is shown that variation in loading rigidity (including when the scale factor is investigated) leads to differing deformation histories and, in the final analysis, to disturbance of similarity in loading in systems with differing rigidity. Methods of dimensional analysis are used for obtaining similarity conditions for quasistatic tests with different loading rigidities. Based on these conditions, one of the studies on the scale factor is examined. It is concluded that the significant variations in mechanical characteristics observed in the study are connected with nonfulfillment of the similarity condition in the form εP = idem. To eliminate unforeseen failures of metallic structures (in particular, large-size) working with different loading rigidities, it is suggested that quasistatic testing be carried out on specimens with deformation histories simulating those under operating conditions.
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Translated from Problemy Prochnosti, No. 7, pp. 70–75, July, 1990.
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Popov, N.N. Effect of loading rigidity on the deformation history in quasistatic tests on metals. Strength Mater 22, 1025–1032 (1990). https://doi.org/10.1007/BF00767552
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DOI: https://doi.org/10.1007/BF00767552