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RISS 인기검색어
- 검색키워드
- 저자 : Brcic, Stanko V. (검색결과 4 건)
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Uniaxial fatigue, creep and stress-strain responses of steel 30CrNiMo8
Josip Brnic,Marino Brcic,Sanjin Krscanski,Domagoj Lanc,Sijie Chen 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.31 No.4
The choice of individual material for industrial application is primarily based on knowledge of its behavior in similar applications and similar environmental conditions. Contemporary design implies knowledge of material behavior and knowledge in the area of structural analysis supported by large capacity computers. Bearing this in mind, this paper presents and analyzes the experimental results related to the mechanical properties of the material considered (30CrNiMo8/1.6580/AISI 4340) at different temperatures as well as its creep and fatigue behavior. All experimental tests were carried out as uniaxial tests. The test results related to the mechanical properties are presented in the form of engineering stress-strain diagrams. The results related to the creep behavior of the material are shown in the form of creep curves, while the fatigue of the material is shown in the form of stress – life (−) diagram. Based on these experimental results, the values of the following properties are determined: ultimate tensile strength (,20=696 MPa), yield strength (0.2,20=355.5 MPa), modulus of elasticity (,20=217 GPa) and fatigue limit (,20,=−1=280.4 MPa). Results related to fatigue tests were obtained at room temperature and stress ratio =−1.
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Reliable experimental data as a key factor for design of mechanical structures
Josip Brnic,Sanjin Krscanski,Marino Brcic,Lin Geng,Jitai Niu,Biao Ding 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.2
The experimentally determined mechanical behavior of the material under the prescribed service conditions is the basis of advanced engineering optimum design. To allow experimental data on the behavior of the material considered, uniaxial stress tests were made. The aforementioned tests have enabled the determination of mechanical properties of material at different temperatures, then, the material's resistance to creep at various temperatures and stress levels, and finally, insight into the uniaxial high cyclic fatigue of the material under different applied stresses for prescribed stress ratio. Based on fatigue tests, using modified staircase method, fatigue limit was determined. All these data contributes the reliability of the use of material in mechanical structures. Data representing mechanical properties are shown in the form of engineering stress-strain diagrams; creep behavior is displayed in the form of creep curves while fatigue of the material is presented in the form of S-N (maximum applied stress versus number of the cycles to failure) curve. Material under consideration was 18CrNi8 (1.5920) steel. Ultimate tensile strength and yield strength at room temperature and at temperature of 600°C: [,/=(/)MPa; .,/=(/)MPa], as well as endurance (fatigue) limit at room temperature and stress ratio of =−: (,,=− = 285.1MPa).
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Stress state around cylindrical cavities in transversally isotropic rock mass
Lukic, Dragan C.,Prokic, Aleksandar D.,Brcic, Stanko V. Techno-Press 2014 Geomechanics & engineering Vol.6 No.3
The present paper is dealing with the investigation of the stress field around the infinitely long cylindrical cavity, of a circular cross section, contained in the transversally isotropic elastic continuum. Investigation is based upon the determination of the stress function that satisfies the biharmonic equation, for the given boundary conditions and for rotationaly symmetric loading. The solution of the partial differential equation of the problem is given in the form of infinite series of Bessel's functions. Determination of the stress-strain field around cavities is a common requirement for estimation of safety of underground rock excavations.
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Short-time creep, fatigue and mechanical properties of 42CrMo4 - Low alloy structural steel
Josip Brnic,Marko Canadija,Goran Turkalj,Sanjin Krscanski,Domagoj Lanc,Marino Brcic,Zeng Gao 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.4
The proper selection of materials for the intended use of the structural member is of particular interest. The paper deals with determining both the mechanical properties at different temperatures and the behavior in tensile creep as well as fatigue testing of tensile stressed specimens made of low alloy 42CrMo4 steel delivered as annealed and cold drawn. This steel is usually used in engineering practice in design of statically and dynamically stressed components. Displayed engineering stress - strain diagrams indicate the mechanical properties, creep curves indicate the material creep behavior while experimental investigations of fatigue may ensure the fatigue limit determination for considered stress ratio. Also, hardness testing provides an insight into material resistance to plastic deformation. Experimentally obtained results regarding material properties were: tensile strength (735 MPa / 20°C, 105 MPa / 680°C), yield strength (593 MPa / 20°C, 76 MPa /680°C). Fatigue limit in the amount of 532.26 MPa, as maximum stress at stress ratio <i>R</i> = 0.25 at ambient temperature was calculated on the basis of experimentally obtained results. Regarding the creep resistance it is visible that this steel can be treated as creep resistant at high temperatures (including 580°C) when applied stress is of low level (till 0.2 of yield stress).
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