Editorial & Advisory Board - Acta Technica Corviniensis

More documents

Recommendations

Info

NUMERICAL RESULTS As it was described in the previous section, the parameter which will be used for assessing the damage of the steel moment resisting frame is the behavioral factor for the frame which will be computed from the bigger loop of the base shear‐top displacement hystertic behavior of the frame. Figures 8 to 10 show the base shear‐top displacement relation ships for the analyzed frames considering different E/Q records and at P.G.A=0.35G. Table 2 show the values of the Q‐factor for the analyzed frames and considering different E/Q records (three earthquake records) [11,12.13]. It is noted from the analysis of the results that the values of overall behavior factor are more conservative than those given by Eurocode 8 or UBC, 1997[10]. Table 2. Values of the Q‐factor for the studied frames at P.G.A., 0.35G Frame No. CHILE SUMATRA HAITI 2010 2010 2010 1 3.380 2.871 4.343 2 4.054 3.132 4.859 3 4.217 3.260 5.091 Figure 8. Lateral drift‐base shear relationship for the frame 1, considering SUMATRA EQ. at P.G.A, 0.35G Figure 9. Lateral drift‐base shear relationship for the frame 2 considering SUMATRA EQ. at P.G.A, 0.35G Figure 10. Lateral drift‐base shear relationship for the frame 3 considering SUMATRA EQ. at P.G.A, 0.35G CONCLUSIONS This paper presents the results of extensive deterministic analysis performed on both SDOF and MDOF systems of moment resisting steel frames under repeated E/Q ground motions. The analysis demonstrated that the reputation of seismic events at short time may lead to damage of the frames which ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering was assumed when the maximum inner story drift reaches to 4% of the story height. From the analyses of the results the following conclusions can be summarized: Some acceleration ground motions cause more inelastic deformations than other for the same frame and at the same P.G.A level which indicates that damage parameters (as behavior factor) can not be accurately specified as recommended by different provisions. The global performance of the steel MRF is strongly depending on the inelastic behavior of its beam to column connections. The behavior factor for SDOF system is lower than that of MDOF system. The behavior factor values calculated are near to those proposed by different seismic codes. REFERENCES [1.] EL‐SHAER M. A. A. "ANALYSIS OF COMPOSITE GIRDERS" ph. D. thesis, Ain Shams University, Cairo, Egypt (1997). [2.] El‐SHAER M. A. "Design of Steel Column Using LRFD Meth", Life Science Journal, 2011; 8(4): 205‐220] (ISSN: 1097‐8135). http://www.lifesciencesite.com. [3.] Egyptian Code of practice for Steel Construction and Bridges (Allowable Stress Design), Code no. Ecp (205), 1 st Edition 2001, Edition 2008. [4.] Egyptian Code of practice for Steel Construction (load and Resistance) factor Design (LRFD) (205) Ministerial Decree No. 359‐2007 First Edition 2008. [5.] American Institute of steel Construction, INC. “Seismic Provisions for Structural Steel Building”, AISC, April, 2010. [6.] Mazzolani, F.M. and Piluso, V., “Theory and Design of Seismic Resistant Steel Frames”, E& FN SPON, London, 2009 [7.] Bonev, Z. and Hristov, H., “Behavior Factor Evaluation Based on SDOF System Presentation and Energy Approach”, Journal of Earthquake Engineering and structural Dynamics, Vol. 30, January, 2011. [8.] Fajfar, P., “Structural Analysis in Earthquake Engineering‐ A Breakthrough of Simplified Non‐ Linear Methods”, 12 th European Conference on earthquake engineering, 2011. [9.] AISC Specification "steel construction manual" American Institute of steel construction, Eighth edition, (2004). [10.] Pinto, A. V., “Introduction to the European Research Projects in Support of Eurocode 9”, 11 th European Conference on earthquake engineering 1998, Balkema, Rotrdam. [11.] CHILE earthquake, Location (MAULE), 27 February 2010, Magnitude 8.8 [12.] SUMATRA earthquake, Location (INDONESIA), 25 October 2010, Magnitude ‐7.7 [13.] HAITI earthquake, Location (HAITI) 12 JANUARY 2010, Magnitude 7.0 ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERING ISSN: 2067‐3809 [CD‐Rom, online] 60 2012. Fascicule 2 [April–June]
NEW KNOWLEDGES AT MACHINING OF IMPROVING HIGHSTRENGTH GRAPHITE CAST IRON BY DRILLING 1. Michal SPORKA, 2. Tatiana CZÁNOVÁ 1. DEPARTMENT OF MACHINING AND ANUFACTURING TECHNOLOGY, FACULTY OF MECHANICAL ENGINEERING, UNIVERSITY OF ZILINA, SLOVAKIA ABSTRACT: High fortification of the machined surface of ADI (Austempered Ductile Iron) cast iron can significantly affect its functional properties. This article deals with problems of selected ADI samples, their production and use. On the basis of experimental tests has been identified its machinability, the cutting process during drilling, and also mutual comparison of nodular and grey cast iron, which will further intensify and extend current knowledge of this problems. KEYWORDS: ADI cast iron, drilling, machinability INTRODUCTION The relatively new construct material ADI alloy (ADI – Austempered ductile iron) have a special properties It is a bainite cast iron which we have from heat treatment (isothermal improving) of graphite cast iron with spherical graphite (nodular cast iron). ADI cast iron offers combination of simple properties like steel have. If conditions are fulfilling the ADI cast iron seems like steel for improving for example 42 CrMo4 (15 142), with its properties. USING OF ADI CAST IRON ADI cast irons are more low density like steel at same strength, have good wear resistance, elasticity, good sliding conditions and run into good characteristics of internal damping. This is why ADI is rivalrous to steel for forging, improving and steel cast iron. Figure 1. Single‐throw crank‐shaft of Volkswagen engine 1,8T material EN‐GJS‐600‐3 (www.lam.mw.tum.de) Substitute of steel with casting from ADI is still the most frequent mood of application to reduce the manufacturing costs that means saving money or increasing life of workpieces (fig.1). If we know ratio between relative mass and slip line of ADI cast iron as against aluminium, steel and nodular cast iron are advantages at using ADI cast iron (fig.2). ADI cast iron are manufactured by isothermal improving, what is process of thermal treatment and it significantly impacts their mechanical properties (tab.1). Table 1. Mechanical properties of ADI materials according to DIN EN 1564 (BECHNÝ, 2003) Mark Number Rm Rp 0,2 A5 (MPa) (MPa) (%) EN‐GJS‐ 800‐8 EN‐GJS‐ 1000‐5 EN‐GJS‐ 1200‐2 EN‐GJS‐ 1400‐1 EN‐ JS1100 EN‐ JS1110 EN‐ JS1120 EN‐ JS1130 800 500 8 1000 700 5 1200 750 2 1400 1100 1 HB 260 to 320 300 to 360 340 to 440 380 to 480 The properties of ADI are appointed for conditions of higher and high working strains (BECHNÝ, 2003). EXPERIMENTALLY MEASUREMENT It was drilled fifteen not continuous holes to prepared samples (fig.4) (drilling to full material) at five cutting conditions. The diameter of drilled holes was D = 6,8 mm and deep was h = 2xD. For experiment was used machine CNC – tripleaxle milling machine STAMA 325 and a tool GÜHRING 5518 DIN 6537 L91x6,8 mm – PVD TiAlN (fig.3). Figure 2. Comparison of material´s conditions a) b) Figure 3. Photos of drilling tool a) back plane P p , b) working reference plane P r © copyright FACULTY of ENGINEERING ‐ HUNEDOARA, ROMANIA 61
Page 2 and 3:
ACTA TECHNICA CORVINIENSIS - BULLET
Page 4 and 5:
ACTA TECHNICA CORVINIENSIS - Bullet
Page 6 and 7:
Page 8 and 9:
Regional Editors from MALAYSIA Abde
Page 10 and 11: Imre TIMÁR University of Pannonia,
Page 12 and 13: Ioan MILOŞAN Transilvania Universi
Page 14 and 15: Member from GREECE Nicolaos VAXEVAN
Page 16 and 17: ACTA TECHNICA CORVINIENSIS - Bullet
Page 22 and 23: Other cases, when the variable spac
Page 24 and 25: optimization). The displacements of
Page 26 and 27: [16.] Maire, E., Schmidt, T.: Topol
Page 28 and 29: Left part of the main window (Figur
Page 30 and 31: Generated XML file has node as roo
Page 34 and 35: ecause can influences of security a
Page 36 and 37: Therefore, development should be di
Page 38 and 39: To measure has not been used extens
Page 42 and 43: and enrichment, design, capturing,
Page 44 and 45: EXAMPLE PLM SOLUTIONS With the anal
Page 46 and 47: [10] Kajmakoska, B., Koeck, A.M, Wi
Page 48 and 49: est known is Drude‐Lorentz model
Page 52 and 53: Sl. No 52 % of Red Soil % of Sand T
Page 58 and 59: Where, f s is the steel stress; f y
Page 62 and 63: Welding sleeve Basic material ACTA
Page 66 and 67: help learners throughout their care
Page 68 and 69: In the frame of the same idea, the
Page 70 and 71: METHODOLOGY OF INVESTIGATION HEAT T
Page 72 and 73: Significant increase in the concent
Page 76 and 77: In addition the vision and mission
Page 78 and 79: sharing between pre‐contract and
Page 80 and 81: [21.] Oyediran, O. S., & Akintola,
Page 82 and 83: 2006, 208 large dams had been const
Page 84 and 85: original area and to skip unnecessa
Page 86 and 87: Figure 4: An example of cutting for
Page 88 and 89: [4]. Or: extracting evidence from c
Page 90 and 91: tampered with or altered, helping t
Page 94 and 95: e attaching on the discharge wires.
Page 98 and 99: SDS‐PAGE FOR LPS (Modified proced
Page 100 and 101: to be 2H‐Pyaran,2, 5‐diethenylt
Page 104 and 105: MATHEMATICAL MODEL MINIMALIZATION O
Page 106 and 107: Management. Journal of Manufacturin
Page 108 and 109: We can now read the ABAP instructio
Page 110 and 111:
Page 112 and 113:
three types of basic controllers to
Page 114 and 115:
experimental case compared to 1170
Page 116 and 117:
was heated in a resistance furnace.
Page 118 and 119:
overview how the error, i.e. differ
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Optimization of the processes for d
Page 126 and 127:
Page 128 and 129:
Engineering Hunedoara - Internation
Page 130 and 131:
According to these basic types of m
Page 132 and 133:
Load of contact areas on the die dr
Page 134 and 135:
Page 136 and 137:
Access Control: Access control mech
Page 138 and 139:
Another technique based on access c
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
show all

Editorial & Advisory Board - Acta Technica Corviniensis

Create successful ePaper yourself

Delete template?

Save as template?