PSI - Issue 28

NikolayA. Makhutov et al. / Procedia Structural Integrity 28 (2020) 1347–1359 N.Makhutov, D.Reznikov / Structural Integrity Procedia 00 (2020) 000–000

1359

13

the smooth specimen subjected to similar loading regimes (Regimes 1 and 4, Table 1).

Table 2. Characteristics of strength and ductility of the Sharpy specimen under static (1) and dynamic (4) loading

t , о С

Regime

e

D ec

I c

e max c

k 

max c e 414 64,3

c

y 

1 4

+ 20 - 80

0,78 0,32

0,67 0,67

1,13 1,13

0,523 0,215

1,13 2,98

492

90 The presented approach to the analysis of stress-strain response and ultimate states of structural components that accounts for the effects of stress and strain concentration, high-speed and low-temperature hardening, as well as the increase in the first principal stresses and the reduction of ultimate plastic strains due to triaxiality of the state of stress in the notch zone, can be used for rationale strength and safety of high-risk facilities of nuclear and aerospace industries. Acknowledgments This work was financially supported by the Russian Foundation for Basic Research (grant no 20-58-00019Bel_а). Referencies Makhutov, N., 1981. Strain-based criteria of failure and strength analysis of structural components. Moscow, Mashinostroeniye publ., pp.271 (in Russian). Makhutov, N., 2008. Strength and safety: basic and applied research. Nauka publ., Novosibirsk, pp. 528 (in Russian). Makhutov, N., Matvienko, Yu., Romanov A., 2018. Problems of strength, technological safety and materials science. Editorial URSS publ., Moscow, pp.720 (in Russian). Neiber, G., Khan, G., 1975. The problem of stress concentration. In: Periodic collections of translations of foreign articles: Mechanics, No. 3. - M .: Nauka, pp.285 (in Russian). Makhutov, N., Reznikov D., 2018. Methods for assessment of states the stresses and strains in the notch zones under normal and emergency loading conditions. Problems of Safety and emergency situations 4, 3-28 (in Russian). Makhtov, N.. Reznikov, D., 2019a. Estimation of the Local State of Stress and Strains in Stress Concentration Zones in a Wide Strain Range. Russian Metallurgy (Metally) 10, 74–980. Makhutov, N., Reznikov, D., 2019b. Generalization of Neuber’s Rule for the Assessment of Local Stresses and Strains in Stress Concentration Zones for a Wide Range of Applied Strains. Procedia Structural Integrity 14, 199–206. Konstantinov, A., 2014. Identification of a model of copper strain for problems of impact dynamics. Bulletin of the Nizhny Novgorod University 1 (2) 256-261 (in Russian). Bondarovich, L., Zlochevsky, A., Makhutov, N., 1980. Methodological features of determining the crack resistance of materials during high speed strain. Zavodskaya laboratory 46 (11) 1020 (in Russian). Yu, H., Jeong, D., 2010. Application of a stress triaxiality dependent fracture criterion in the finite element analysis of unnotched Charpy specimens. Theoretical and Applied Fracture Mechanics 54, 54–62. Bao, Y., Wierzbicki, T., 2004. On fracture locus in the equivalent strain and stress triaxiality space. International Journal of Mechanical Sciences 46, 81–98. Lee, Y. W., Wierzbicki, T., 2004. Quick Fracture Calibration for Industrial Use. Massachusetts Institute of Technology, Impact & Crashworthiness Laboratory Report No. 115.