DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

ONE-PARAMETRIC DETERMINATIONOF UNIFORM PLASTIC STRAIN FOR STANDARD STEELS

Vestnik MGSU 6/2013
  • 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 .
  • Allattouf Hassan Lattouf - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Mechanic Equip- ment, Details of Machines and Technology of Metals, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 57-62

One-parametric dependence of the uniform elongation on the total elongation is tested on the basis of preliminary studies. It makes it possible to assess static and cyclic parameters of steel forgings with the thickness values up to 500—800 mm, although no time-consuming and labour-intensive experiments are needed.The total elongation consists of uniform and concentrative components. The uniform elongation corresponds to the maximum loading value attained in the process of static tension testing. The special feature and the advantage of this feature is its independence from the shape of samples exposed to testing procedures. This feature is employed to determine the per-unit performance of plastic strain of steel in terms of brittle failure and fatigue resistance of metals. The uniform elongation correlates with the elasticity used to evaluate the cold brittleness of metal materials. Thus, the assessment of the uniform plastic deformation is needed to make an educated choice of materials and analyze the conditions of processing industrial and structural steels.

DOI: 10.22227/1997-0935.2013.6.57-62

References
  1. Gustov Yu.I., Gustov D.Yu., Bol’shakov V.I. Prochnostno-plasticheskaya indeksatsiya metallicheskikh materialov [Strength and Plasticity Indexing of Metal Materials]. Metallurgiya i gornorudnaya promyshlennost’ [Metallurgy and Mining Industry]. 1996, no. 3-4, pp. 31—33.
  2. Balandin V.A., Potapov V.N., Yakovleva V.S. Otsenivat’ rabotosposobnost’ konstruktsiy po ravnomernomu otnositel’nomu udlineniyu staley [Assessment of Performance of Structures on the Basis of Uniform Relative Elongation of Steels]. Promyshlennoe stroitel’stvo [Industrial Engineering]. 1976, no. 11, pp.37—38.
  3. Matt K. Zeitschrift f?r Metallkunde. 1962. Bd. 53, H4.
  4. Borisova S.A. Vliyanie termotsiklicheskoy obrabotki na rabotosposobnost’ desyati konstruktsionnykh staley [Influence of Thermal-cycle Treatment on Performance of Ten Grades of Structural Steel]. Materialovedenie i metallurgiya [Material Science and Metallurgy]. Trudy NGTU [Works of Nizhegorodsky State University of Technology]. Nizhny Novgorod, NGTU Publ., 2004, vol. 42, pp. 220—224.
  5. Skudnov V.A., Lovkov A.V. Vzaimosvyaz’ predela ustalosti s kriteriyami razrusheniya sinergetiki staley [Interrelation between Fatigue Point and Criteria for Destruction of Steel Synergetics]. Materialovedenie i metallurgiya [Material Science and Metallurgy]. Trudy NGTU [Works of Nizhegorodsky State University of Technology]. Nizhny Novgorod, NGTU Publ., 2004, vol. 42, pp. 119—123.
  6. Gustov Yu.I., Allattuf H. Sinergeticheskie kriterii staley standartnykh kategoriy prochnosti [Synergetic Criteria of Steels Having Standard Grades of Strength]. Mekhanizatsiya stroitel’stva [Mechanization of Construction Operations]. 2013, no.2, pp. 24—27.
  7. Korobko V.I. Zolotaya proportsiya i problemy garmonii sistem [Golden Proportion and Problems of Harmony of Systems]. Izdatel’stvo ASV Stran SNG Publ., 373 p.
  8. Ivanova V.S., Balankin A.S., Bunin I.Zh., Oksogoev A.A. Sinergetika i fraktaly v materialovedenii [Synergy and Fractals in Material Science]. Moscow, Nauka Publ., 1994, 383 p.
  9. Skudnov V.A. Zakonomernosti predel’noy udel’noy energii deformatsii – osnovnoy sinergeticheskoy (kooperativnoy) kharakteristiki razrusheniya i rabotosposobnosti metallov [Regularities of Limit Per-unit Energy of Deformation as the Principal Synergetic (Cooperative) Destruction and Performance-related Characteristic of Metals]. Trudy NGTU. Materialovedenie i metallurgiya. [Works of Nizhegorodsky State University of Technology. Material Science and Metallurgy]. Nizhny Novgorod, 2004, vol. 94, 101 p.
  10. Tylkin M.A. Spravochnik termista remontnoy sluzhby [Reference Book for a Heat Treater of the Repair Service]. Moscow, Metallurgiya Publ., 1981, 647 p.

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Study of interdependence between ductility factors and yield limits for steelsof standard strength grades

Vestnik MGSU 7/2013
  • 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 .
  • Allattouf Hassan Lattouf - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Mechanic Equip- ment, Details of Machines and Technology of Metals, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 22-26

Standard metal ductility factors are elongation and necking. These factors are defined as conditional ones in contrast to true (logarithmic) ductility factors. In addition, elongation and necking do not appear in an explicit form in the design formulas for the determination of static, cyclic or dynamic strength values.At the same time, exact values of ductility factors should be integrated into com-bined workability criteria for steels and alloys together with strength factors due to the unity of the processes of deformation and resistance to deformation. This combination of ductility factors and strength factors appears in a well-known formula describing dependence between the ultimate breaking strength and hardness.Here, the proportionality factor is equal to 0.3–0.6, and it is not characterized by the corresponding values of elongation or necking. Hence, the intention is to express the above-mentioned proportionality factor in a different form in respect of ductility characteristics, and, as a result, new ductility factors are proposed.Dependencies between ductility factors and yield limits, identified by the co-authors, may be applied to identify the synergetic criteria of metal materials to be used in the process of design, production and operation of welded metal structures. Moreover, the findings of the co-authors may be used in the process of design, production and operation of working elements of construction machines and equipment.

DOI: 10.22227/1997-0935.2013.7.22-26

References
  1. Gustov Yu.I., Gustov D.Yu., Voronina I.V. Sinergeticheskie kriterii metallicheskikh materialov [Synergetic Criteria of Metal Materials]. Doklady XV Rossiysko-slovatsko-pol’skogo seminara “Teoreticheskie osnova stroitel’stva” [Collected works of the 15th Russian-Slovak-Polish Seminar. Theoretical Fundamentals of Civil Engineering.] Warsaw, 2006, pp. 179—184.
  2. Gustov Yu.I., Allattouf H. Sinergeticheskie kriterii staley standartnykh kategoriy prochnosti [Synergetic Criteria of Steels Having Standard Grades of Strength]. Mekhanizatsiya stroitel’stva [Mechanization of Construction Operations]. 2013, no.2, pp. 24—27.
  3. Ivanova V.S., Balankin A.S., Bunin I.Zh., Oksogoev A.A. Sinergetika i fraktaly v materialovedenii [Synergy and Fractals in Material Science]. Moscow, Nauka Publ., 1994, 383 p.
  4. Skudnov V.A. Novye kompleksy razrusheniya sinergetiki dlya otsenki sostoyaniya staley [New Synergetics Destruction Facilities Used to Assess the State of Steels]. Materialovedenie i metallurgiya. Trudy NGTU [Material Science and Metallurgy. Works of Nizhny Novgorod State Technical University]. Nizhny Novgorod, NGTU Publ., 2003, vol. 38, pp. 155—159.
  5. Ivanova V.S. Sinergetika. Prochnost’ i razrushenie metallicheskikh materialov. [Synergetics. Strength and Destruction of Metal Materials]. Moscow, Nauka Publ., 1992, 155 p.
  6. Schulze W. Einf?rung in die Baustoffpr?fung. Berlin, VEB Verlag f?r Bauwessen, 1972.
  7. Tylkin M.A. Spravochnik termista remontnoy sluzhby [Reference Book for a Heat Treater of the Repair Service]. Moscow, Metallurgiya Publ., 1981, 648 p.
  8. GOST 8479—70. Pokovki i kovanye zagotovki. Kategorii prochnosti, normy mekhanicheskikh svoystv, opredelennye pri ispytaniyakh na prodol’nykh obraztsakh, i normy tverdosti [State Standard 8479—70. Forgings and blank forgings. Categories of strength, norms of mechanical properties identified in the course of testing longitudinal samples; hardness norms].
  9. Belov V.A., Gusev A.A., Shcherbina S.V. Modernizatsiya svarnykh soedineniy s flangovymi shvami pri izmenyaemoy tolshchine prikreplyaemogo elementa [Modernization of Welded Joints Having Fillet Welds If the Thickness of a Connected Element Is Variable]. Mekhanizatsiya stroitel’stva [Mechanization of Construction Operations]. 2013, no. 12, pp. 29—30.
  10. Tikhonov A.F., Grishin A.A. Analiz razvitiya metodov i mashin dlya razrabotki tyazhelykh i merzlykh gruntov [Analysis of Development of Methods and Machinery for Excavation of Heavy and Frozen Soils]. Mekhanizatsiya stroitel’stva [Mechanization of Construction Operations]. 2011, no. 8, pp. 28—30.

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