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Online since: June 2019
Authors: Constantin Gheorghe Opran, Daniiel Serban, Laurentia Alexandrescu
The samples for measuring physical-mechanic properties according ISO 572-2 were manufactured using a Brabender hot press, a hydraulic press for punching materials from the pressed plates composites and a compression mold (Fig. 2).
By hot pressing the composites mixtures were processed into plates of 2.5 mm thickness from which were punched on a hydraulic press the materials to fit the compression mold.
The compression mold was first preheated to 165 °C, then each cavity was filled with punched materials (Fig. 2).
For the P7 recipe there were observed difficulties in plasticising the materials.
Gopakumar, Properties and Crystallization of Malleated Polypropylene /Graphite Flake Nanocomposites, Polymer Journal, Vol. 38, No. 9, pp. 920-929 (2006) [10] L.Altay, M.
Online since: October 2013
Authors: Ildikó Maňková, Jozef Beňo, Marek Vrabel'
Introduction Hard machining can be described as the machining of materials with hardness above 40 HRC and up to 62 HRC [1].
In this contribution knowledge of comparative quantitative evaluation of hardened materials surface micro geometry expressed by 2D parameters as Ra, Rq, Rz, Rt, RSm, Rsk, Rku, and Abbot Firestone curve and selected 3D parameters SRa, SRq, SRt, SRsk, SRku when hard turning workpiece with different hardness using mixed oxide ceramic insert are presented.
The cutting tool material was mixed oxide alumina ceramics CM D310 (70% AL2O3, ZrO2, 30% TiC).
Acknowledgement Presented results were carried out within Research Grant Projects VEGA No. 1/0279/11 and 1/0500/12 supported by Scientific Grant Agency of the Ministry of Education of Slovak Republic and the Slovak Academy of Science.
Gyani, Accuracy of hard turning, Journal of Materials Processing Technology. 202 (2008) 328−338
Online since: February 2012
Authors: Antonio Del Prete, Domenico Umbrello, Luigino Filice, Antonio Alberto de Vitis, Serafino Caruso
Introduction Aerospace alloys machinability is increasing its importance since new materials are developed to meet the growing demand for higher temperature-resistant materials and for more efficient aero-engines [1].
All the cutting parameters, including: tool and coating materials choice, tool geometry, machining strategy, cutting speed, feed rate, depth-of cut, lubrication, must be controlled in order to achieve both an acceptable tool life and a correct surface integrity for the machined parts [3].
More in detail, it results clear the role played by of the engaging angle on the tool life (failure or wear) for the investigated couple of materials (workpiece and tool).
Modelling the correlation between processing parameters and properties in titanium alloys using artificial neural network, Computational Materials Science, 21 (2001) 375-394
Spowage, Surface integrity when machining age hardened Inconel 718 with coated cutting tools, International Journal of Mach.
Online since: November 2012
Authors: Zheng Xiang Mi, Jun Lu, Shao Wei Hu
Advanced Materials Research, Vols. 189-193(2011), p.1117
Advanced Materials Research, Vol. 80-81(2011), p.261
Materials and Structures, Vols. 31(1998) No.3, p.683
Fatigue and Fracture of Engineering Materials and Structures, Vols. 12(1989), No.1, p.9
American Society for Testing and Materials, Vols. 536(1973), p.423
Online since: June 2012
Authors: Jay C.Y. Huang, Chang Ming Hu, Chi Hao Yeh
This synergy addresses major problems such as conflicts and target specifications for quality characteristics and negative interactions between product structures, materials, manufacturing processes, and shop floor control requirements through the second QFD phases.
Proceedings of the 2009 second international workshop on computer science and engineering, DC, USA, pp 548–552 [11] Kuen-Horng Tsai1, Chun-Yu Yeh, Hsin-Chang Lo, Chun-Ting Li, Chan-Peng Cheng, Guan-Liang Chang,Application of Quality Function Deployment in Design of Mobile Assistive Devices , Journal of Medical and Biological Engineering, 2008, 28(2): 87-93 [12] Yeh-Liang Hsu* Yung-Chieh Hung Ju-Zhong Yin, Design of a Novel Total Knee Prosthesis Using TRIZ ,Journal of Medical and Biological Engineering, Nov 2006, 26(4): 177-185 177 [13] Charles B.
British Medical Journal (2005) [14] C.
British Medical Journal (2005) [19] Hellman H., Beyond your senses: the new world of sensors.
Zeller, Writer; The Journal of American Medical Association.
Online since: February 2018
Authors: Kai Gui Zhu, Jian Gang Yu, Wen Jia Han, Zhong Chao Sun
Recent progress in research on tungsten materials for nuclear fusion applications in Europe, J.
Zheng, et al., An integrated model for materials in a fusion power plant: transmutation, gas production, and helium embrittlement under neutron irradiation, Nuclear Fusion 52 (2012) 083019. ,[] P.E.
Desgardin, et al., Trapping and release of helium in tungsten, Journal of Nuclear Materials 416 (2011) 13-17. ].
Spolenak, Alpha-vs. beta-W nanocrystalline thin films: A comprehensive study of sputter parameters and resulting materials' properties, Thin Solid Films, 577 (2015) 26-34. ].
Therefore, the microstructure of the thin films is quite different from the bulk materials regarding the lattice parameters, defect concentration and grain orientations [[] G.
Online since: December 2014
Authors: Helena Fidlerová, Jan Prachař, Peter Sakál, Tatiana Zbojová
(pc) A 4303176 800 5 B 4343345 480 1 C 4343346 800 4 D 343347 480 4 Materials A, B, C, D should have a constant and regular consumption, a high degree of production repeatability, a higher proportion of the revenues and flexibility of the workers.
The pessimistic estimate, takes into account potential risks such as lack of materials, downtime, failure, etc.
It is also important that staff is aware that any mistake or loss of Kanban cards can endanger the continuity of material flow and supply of materials to the customer.
In: Applied Mechanics and Materials. – 2014, - Vol. 474 pp. 49-54,online http://www.scientific.net/AMM.474.49 ISSN 1660-9336
Lewis, "Lean production and sustainable competitive advantage", International Journal of Operations & Production Management, 2000, Vol. 20 Iss: 8, pp.959 - 978 [6] B.
Online since: March 2007
Authors: R.H. Wu, K.C. Pang
Meanwhile, compared with Rigid-Plastic FEM, Rigid-ViscoPlastic FEM considers the influence of deformation velocity on the material flow stress in constitutive equation, which can reflect the true plastic deformation process of materials [1-4].
DEFORM software provides different methods to define the materials flow stress [7]: 1) Power law, 2) Tabular data format, 3) Flow stress for aluminum alloys (Type 1), 4) Flow stress for aluminum alloys (Type 2), 5) Linear hardening, and 6) User defined flow stress routine.
It shall be noted that when the simulation conditions of materials exceeds the bounds of the strain, strain rate or temperature defined in the tabular data, the program will extrapolate based on the last two data points which may lead to loss of accuracy.
Werner: Computational Materials Science Vol. 28 (2003), p. 469 [4] M.Mohamdein and J.
Thiebaut: Journal of Materials processing Technology Vol. 77 (1998), p. 240 [9] Z.
Online since: September 2003
Authors: Zheng Yi Fu, Hao Wang, Wei Min Wang
More suitable sintering additives should be studied in TiB2 materials.
Experimental Materials and sample preparation.
[3] C.B.Finch,P.F.Becher,et al: Advanced Ceramic Materials, Vol. 1 (1986), p. 50
[6] V.Tennerg, Fineh: Science of Hard Materials (Plenum, New York 1989)
Proc. 1996, p.128 [8] F.Izumi: Journal of Japanese Crystal Society, Vol. 7 (1985), p. 23
Online since: June 2007
Authors: Tao Suo, Yuan Yong Liu, Yu Long Li
Temperature and strain rate effects on PMMA under quasi-static and moderate strain rate were analyzed by Arruda [2] and material property characterization was also carried by Lee [3] under dynamic loading, they found that the increase of temperature has a drastic effect on the stress-strain behavior and thermal softening was observed for the tested materials.
It is found that temperature effect on material property is remarkable.
But unfortunately, the Fig. 4 Comparison of prediction using ZWT model and experimental results (c) True strain True stress (MPa) (d) True strain True stress (MPa) (e) True strain True stress (MPa) True strain True stress (MPa) (b) True strain True stress (MPa) (a)Table 1 Determined values at elevated testing temperatures Temperature(K) a(MPa) b E1 (MPa) θ1 (s) E2 (MPa) θ2 (s) 299 126.5 35.7 1270 0.62 6416.3 1.6×10-4 313 101.9 40.4 1783.8 0.32 5960.4 7.6×10-5 333 66.6 52.4 1304.5 0.28 3901.1 8.9×10-5 353 53.5 59.6 1187.5 0.39 2540.9 9.7×10-5 373 27.2 101.7 1366.6 0.23 1552.2 1.5×10-4 ZWT theoretical model does not include the influence of damage on the mechanical behavior of materials, leading to the insufficient in describing the strain softening behavior of materials.
Journal of Shanghai Jiaotong University, Jun., Vol.38 sup (2004): p89-95
[10] Wang Li Li, Yu Tong Xi, Li Yong Chi: Progress in Impact Dynamics (Publishions of University of Science and Technology of China, China 1992).
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