DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Derivative criteria of plasticity anddurability of metal materials

Vestnik MGSU 9/2014
  • Gustov Yuriy Ivanovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Department of Machinery, Machine Elements and Process Metallurgy, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (499) 183-94-95; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Gustov Dmitriy Yur’evich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Building and Hoisting Machinery, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (499) 183-53-83; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Voronina Irina Vladimirovna - Moscow State University of Civil Engineering (MGSU) Senior Lecturer, Department of Building and Hoisting Machinery, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (499) 182-16-87; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 39-47

Criteria of plasticity and durability derivative of standard indicators of plasticity (δ, ψ) and durability (σ
0,2, σ
B) are offered. Criteria К
δψ and К
s follow from the equation of relative indicators of durability and plasticity. The purpose of the researches is the establishment of interrelation of derivative criteria with the Page indicator. The values of derivative criteria were defined for steels 50X and 50XH after processing by cold, and also for steels 50G2 and 38HGN after sorbitizing. It was established that the sum of the offered derivative criteria of plasticity and durability С
к considered for the steels is almost equal to unit and corresponds to a square root of relative durability and plasticity criterion C
0,5. Both criteria testify to two-unity opposite processes of deformation and resistance to deformation. By means of the equations for S
к and С it is possible to calculate an indicator of uniform plastic deformation of σ
р and through it to estimate synergetic criteria - true tension and specific energy of deformation and destruction of metal materials. On the basis of the received results the expressions for assessing the uniform and concentrated components of plastic deformation are established. The preference of the dependence of uniform relative lengthening from a cubic root of criterion К
δψ, and also to work of the criteria of relative lengthening and relative durability is given. The advantage of the formulas consists in simplicity and efficiency of calculation, in ensuring necessary accuracy of calculation of the size δ
р for the subsequent calculation of structural and power (synergetic) criteria of reliability of metals.

DOI: 10.22227/1997-0935.2014.9.39-47

References
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Synergetic approachto simulation of physical wear of engineering technical systems

Vestnik MGSU 5/2015
  • Kirillov Andrey Mikhaylovich - Sochi State University (SSU) Candidate of Physical and Mathematical Sciences, Associate Professor, Department of Service and Safety Organization on Transport, Sochi State University (SSU), 26a, Sovetskaya str., Krasnodar Krai, Sochi, 354000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zav’yalov Mikhail Aleksandrovich - Sochi State University (SSU) Doctor of Technical Sciences, Professor, De- partment of Service and Safety Organization on Transport, Sochi State University (SSU), 26a, Sovetskaya str., Krasnodar Krai, Sochi, 354000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 93-102

In course of time in structural elements of engineering technical systems defects and damages are accumulated, which is caused by loadings and environmental influence. The defects are any inconsistencies with normative documents, and damages are discontinuances of structure. The defects and damages lead to decrease of operational properties of structures (their bearing capacity, waterproofing, thermal resistance, etc. The occurrences of such character are called physical wear.In the article the authors show the possibility of phase trajectory use of the processes of physical wear, creep and cusp catastrophe for determinating the critical timepoint, corresponding to the beginning of the system damage catastrophic growth. The alternative approach to the description of the processes of physical wear and creep of pavement consisting in comparison of asphalt concrete creep curve and the curve of the mathematical model of cusp catastrophe, is received. The applied synergetic approach gives us the chance to improve the existing and create new methods of pavement resource forecasting and assessment of physical wear of any technical constructions.

DOI: 10.22227/1997-0935.2015.5.93-102

References
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