TY - JOUR
T1 - Double torsion tests for studying slow crack growth of portland cement mortar
AU - Wecharatana, M.
AU - Shah, S. P.
N1 - Funding Information:
This research was supported by a grant from the National Science Foundation (ENG 77-23534) to the University of Illinois at Chicago Circle. The research grant is under the supervision of A. E. Naaman and S. P. Shah of the Department of Materials Engineering.
PY - 1980
Y1 - 1980
N2 - For studying slow crack growth in portland cement mortar 32″ (812.8 mm) long double torsion specimens were tested. During testing, the loading and reloading compliances, permanent (or inelastic) deformations and crack growth were measured. It was observed that the strain energy release rates calculated from elastic, secant or reloading compliances do not accurately represent the fracture behavior of this material. A modified definition of the strain energy release rate is developed here to include both the elastic and the inelastic strain energy absorbed during crack extension. For this method, in addition to the reloading compliance, the knowledge of the rate of change of permanent deformations with crack growth is necessary. Details of the analytical and experimental procedure are described in this paper.
AB - For studying slow crack growth in portland cement mortar 32″ (812.8 mm) long double torsion specimens were tested. During testing, the loading and reloading compliances, permanent (or inelastic) deformations and crack growth were measured. It was observed that the strain energy release rates calculated from elastic, secant or reloading compliances do not accurately represent the fracture behavior of this material. A modified definition of the strain energy release rate is developed here to include both the elastic and the inelastic strain energy absorbed during crack extension. For this method, in addition to the reloading compliance, the knowledge of the rate of change of permanent deformations with crack growth is necessary. Details of the analytical and experimental procedure are described in this paper.
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U2 - 10.1016/0008-8846(80)90011-3
DO - 10.1016/0008-8846(80)90011-3
M3 - Article
AN - SCOPUS:0019079986
SN - 0008-8846
VL - 10
SP - 833
EP - 844
JO - Cement and Concrete Research
JF - Cement and Concrete Research
IS - 6
ER -