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Online since: November 2013
Authors: Jian Liu, Hua Xu, Shang Ge Liu, Xiao Tao
Study of Shear Constitutive Model for Schistose Rock Mass
Shang Ge Liu1,a, Hua Xu2,b, Jian Liu1,c and Xiao Tao1,d
1State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
2Sui-Yue Expressway Management Office of Hubei Province, Wuhan 430050, China
alsg00@163.com, bxuhuajyq@163.com, cjliu@whrsm.ac.cn, ctaoxiao001@163.com
Keywords: Schistose structure, Shear test, Constitutive model, Exponential function
Abstract.
The model is in the form of piecewise exponential function and its advantages are as follows: Piecewise function can reasonably describe the nonlinear pre-peak shear hardening and post-peak shear softening characteristics; Regard peak strength, peak displacement and residual strength as critical points, so it can accurately describe the strength characteristics of the material; The fitting degree is high with direct shear tests both at dry and water-saturated states; Only one parameter value is needed to obtain by fitting experimental curves while others are convenient to determine.
The advantages of the model are as follows: piecewise function can reasonably describe the nonlinear pre-peak shear hardening characteristic and post-peak shear softening characteristic; Regard peak strength, peak displacement and residual strength as critical points, it can accurately describe the strength characteristics of the material; It has high fitting degree with direct shear tests curves both at dry and saturated states; Only one parameter value is needed to obtain by fitting experimental curves while others are convenient to determine, and model expressions are simple and easy to caculate, all of those are benefit to applications in engineering practice.
Hungr: Canada Geotechnical Journal.Vol.115.(1978),p.239
The model is in the form of piecewise exponential function and its advantages are as follows: Piecewise function can reasonably describe the nonlinear pre-peak shear hardening and post-peak shear softening characteristics; Regard peak strength, peak displacement and residual strength as critical points, so it can accurately describe the strength characteristics of the material; The fitting degree is high with direct shear tests both at dry and water-saturated states; Only one parameter value is needed to obtain by fitting experimental curves while others are convenient to determine.
The advantages of the model are as follows: piecewise function can reasonably describe the nonlinear pre-peak shear hardening characteristic and post-peak shear softening characteristic; Regard peak strength, peak displacement and residual strength as critical points, it can accurately describe the strength characteristics of the material; It has high fitting degree with direct shear tests curves both at dry and saturated states; Only one parameter value is needed to obtain by fitting experimental curves while others are convenient to determine, and model expressions are simple and easy to caculate, all of those are benefit to applications in engineering practice.
Hungr: Canada Geotechnical Journal.Vol.115.(1978),p.239
Online since: May 2011
Authors: Pu Liu
Therefore, application and innovation is the core of IOT development, Innovation 2.0 which the user experience as the core is the soul of the IOT development.
2 Core technologies of the Internet of Things
The foundation and core technology of IOT is still Internet technology, IOT is a network technology expanded on Internet technology; its clients extended to any goods and materials, to exchange information and communication.
International Telecommunication Union (ITU) treats radio frequency identification technology (RFID), sensor technology, nanotechnology, smart materials embedded networking technology as the key technologies. 2.1 Central processing technology established on the basis of the cloud computing Core purpose of IOT is to enhance the central processing capacity.
Sensing technology is a modern interdisciplinary engineering science which major research on access to information from the natural source, and processing (transformation) and recognition.
In the future, smart materials applications will be everywhere together, when the weather sensor system to predict typhoons, traffic sensor unit automatically notifies the returning fishing boats, high-speed off, designated transfer area residents; When an accident occurs, the road monitoring system automatically notifies emergency hospital and provide the best route, GPS system will prompt road vehicles and from the bypass; Monthly, the public service system will automatically record of utilities costs, and automatically debit the bank account after notice headed; etc.
Journal of Consumer Policy, 2008 [3] Marie-José Montpetit, The future of IPTV Connected, mobile, personal and social, Multimedia Tools and Applications, 20 March 2010
International Telecommunication Union (ITU) treats radio frequency identification technology (RFID), sensor technology, nanotechnology, smart materials embedded networking technology as the key technologies. 2.1 Central processing technology established on the basis of the cloud computing Core purpose of IOT is to enhance the central processing capacity.
Sensing technology is a modern interdisciplinary engineering science which major research on access to information from the natural source, and processing (transformation) and recognition.
In the future, smart materials applications will be everywhere together, when the weather sensor system to predict typhoons, traffic sensor unit automatically notifies the returning fishing boats, high-speed off, designated transfer area residents; When an accident occurs, the road monitoring system automatically notifies emergency hospital and provide the best route, GPS system will prompt road vehicles and from the bypass; Monthly, the public service system will automatically record of utilities costs, and automatically debit the bank account after notice headed; etc.
Journal of Consumer Policy, 2008 [3] Marie-José Montpetit, The future of IPTV Connected, mobile, personal and social, Multimedia Tools and Applications, 20 March 2010
Online since: August 2014
Authors: Linda Makovická Osvaldová, Anton Osvald, Danica Kačiková
Coniferous wood after thermal decomposition
Changes in Chemical Composition
There are solid materials that directly enter into reaction with oxygen (e.g. metals).
There are other materials which change their chemical composition in the first phase of heating-up, or which change the composition of their basic structural elements, thereby producing inflammable gases and ignite.
Wood is an example of the latter material.
This material is very resistant to sudden changes of temperature when the temperature difference is greater than 70 °C and it is also very resistant to high temperatures (1,100 °C).
American International Journal of Contemporary Research (AIJCR), 2/2012, Vol. 7, New York : Center for Promoting Ideas (CIP), 2012, s. 37 – 46.
There are other materials which change their chemical composition in the first phase of heating-up, or which change the composition of their basic structural elements, thereby producing inflammable gases and ignite.
Wood is an example of the latter material.
This material is very resistant to sudden changes of temperature when the temperature difference is greater than 70 °C and it is also very resistant to high temperatures (1,100 °C).
American International Journal of Contemporary Research (AIJCR), 2/2012, Vol. 7, New York : Center for Promoting Ideas (CIP), 2012, s. 37 – 46.
Online since: March 2011
Authors: Lei Wang, Xiao Ying Cui, Hui Ming Li
The heavy industrial structure is the main cause to increase the energy consumption
The indicators of industrial enterprises above designated size in TBNA have showed that the three trades of “manufacture of raw chemical materials & products”, “smelting & pressing of metals”, and “processing of petroleum, coking, & processing of nuclear fuel” have taken 70% in total energy consumption but only 25% in total gross industrial output value (Table 2, 3).
Table 2 Ratio of Total Energy Consumption by Main Highly Energy-Consuming Trades Main Highly Energy-Consuming Trades 2004 2005 2006 2007 2008 Manufacture of Raw Chemical Materials & Chemical Products 37.0 41.7 20.8 16.5 20.3 Smelting & Pressing of Metals 10.3 19.3 23.0 39.3 37.8 Processing of Petroleum, Coking,& Processing of Nuclear Fuel 13.7 5.1 21.0 16.1 13.1 Total 61.0 66.1 64.8 71.9 71.1 Table 3 Ratio of Total Gross Industrial Output Value by Main Highly Energy-Consuming Trades Main Highly Energy-Consuming Trades 2004 2005 2006 2007 2008 Manufacture of Raw Chemical Materials & Chemical Products 8.0 5.0 4.9 5.0 5.2 Smelting & Pressing of Metals 8.3 9.7 9.2 13.7 15.5 Processing of Petroleum, Coking,& Processing of Nuclear Fuel 7.5 9.1 8.5 8.2 6.7 Total 23.8 23.8 22.5 26.9 27.5 Data source.
On one hand, use appropriate policy instruments to guide and improve low-carbon industries, such as information and service industry, which have less environmental impact and higher added value due to the limited energy and material consumption.
American Journal of Applied Science, 2005, 2(7): p1166~1168
Table 2 Ratio of Total Energy Consumption by Main Highly Energy-Consuming Trades Main Highly Energy-Consuming Trades 2004 2005 2006 2007 2008 Manufacture of Raw Chemical Materials & Chemical Products 37.0 41.7 20.8 16.5 20.3 Smelting & Pressing of Metals 10.3 19.3 23.0 39.3 37.8 Processing of Petroleum, Coking,& Processing of Nuclear Fuel 13.7 5.1 21.0 16.1 13.1 Total 61.0 66.1 64.8 71.9 71.1 Table 3 Ratio of Total Gross Industrial Output Value by Main Highly Energy-Consuming Trades Main Highly Energy-Consuming Trades 2004 2005 2006 2007 2008 Manufacture of Raw Chemical Materials & Chemical Products 8.0 5.0 4.9 5.0 5.2 Smelting & Pressing of Metals 8.3 9.7 9.2 13.7 15.5 Processing of Petroleum, Coking,& Processing of Nuclear Fuel 7.5 9.1 8.5 8.2 6.7 Total 23.8 23.8 22.5 26.9 27.5 Data source.
On one hand, use appropriate policy instruments to guide and improve low-carbon industries, such as information and service industry, which have less environmental impact and higher added value due to the limited energy and material consumption.
American Journal of Applied Science, 2005, 2(7): p1166~1168
Online since: March 2017
Authors: Cristina E. Lanivschi, Dorina Nicolina Isopescu, Ionuț Ovidiu Toma, Iulian Zăpodeanu, Oana Neculai
The data presented in this paper is part of an innovative product research requested by MACON company, and is focused on establishing the performance parameters of prefabricated hybrid lintel elements, the parameters being limited by the type of used materials, by cross-section and openings spans sizes, and by the manufacturing technology.
Hybrid lintels description Used materials.
The two module types of hybrid lintels, with different volumes of concrete and AAC material, are presented in Fig. 2.
Loads and boundary conditions in FEM analysis Material properties.
Haroun, Nonlinear Modeling and Analysis of AAC in-filled Sandwich Panels for out of Plane Loads, World Academy of Science, Engineering and Technology International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, Vol. 6, No. 4 (2012).
Hybrid lintels description Used materials.
The two module types of hybrid lintels, with different volumes of concrete and AAC material, are presented in Fig. 2.
Loads and boundary conditions in FEM analysis Material properties.
Haroun, Nonlinear Modeling and Analysis of AAC in-filled Sandwich Panels for out of Plane Loads, World Academy of Science, Engineering and Technology International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, Vol. 6, No. 4 (2012).
Online since: February 2011
Authors: Rui Ming Ren, Dong Ying Ju, Tian Cang Zhang, Peng Tao Liu
Numerical Simulation and Experiment of Linear Friction Welding Process of Ti6Al4V alloy
Pengtao Liu1,a, Ruiming Ren1,b, Tiancang Zhang2,c, Dongying Ju1,d
1Department of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
2Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
aptliu@yahoo.cn, brmren@djtu.edu.cn, cbjztc@yahoo.com.cn, ddyju@sit.ac.jp
Keywords: linear friction welding, numerical simulation, Ti6Al4V alloy
Abstract: Using finite element analysis software of COSMAP, a three-dimensional elastic-plastic finite element model of linear friction welding (LFW) process of Ti6Al4V alloy was established.
As an advanced joint technology, LFW has been mainly used in manufacturing and repairing blisks of aero-engines due to its high efficiency, good quality and material saving characteristics.
LFW is a solid state process enabling joining workpieces together through combination of the plasticized materials at the interface, while the plastic deformation is generated by frictional force and heat produced as one workpiece is under pressure in a direct reciprocating mode relative to another [1].
Fu:Journal of Northwestern Polytechnic University.
Ju and T.Inoue: Key Engineering Materials Vols. 345-346 (2007), p. 955 [5] W.A.
As an advanced joint technology, LFW has been mainly used in manufacturing and repairing blisks of aero-engines due to its high efficiency, good quality and material saving characteristics.
LFW is a solid state process enabling joining workpieces together through combination of the plasticized materials at the interface, while the plastic deformation is generated by frictional force and heat produced as one workpiece is under pressure in a direct reciprocating mode relative to another [1].
Fu:Journal of Northwestern Polytechnic University.
Ju and T.Inoue: Key Engineering Materials Vols. 345-346 (2007), p. 955 [5] W.A.
Online since: October 2019
Authors: Viorel Bogdan Rădoiu, Alexandru Pintilie, Mirela Cotrumbă
Basic Aircraft Deceleration Systems
In the current exploitation, there are three basic systems used to decelerate aircraft: with barrier, with cables and with absorbent materials.
The absobent system consists of a pavement bed made of easily deformable materials located at the ends of the runway in the safety zone.
Density of steel wire rope materials ρ 7.8·10-6 kg/mm3 11.
[6] Hernando J.L. and Co., Carrier Suitability of Land-Based Aircraft, 28th International Congress of the Aeronautical Sciences, ICAS 2012, Brisbane, Australia, 2012
[7] Bing Xu and Co., A three dimensional approach to model steel wire ropes used in high energy absorber apparatus, International Journal of Solids and Structures no. 51, Elsevier Ltd., 2014
The absobent system consists of a pavement bed made of easily deformable materials located at the ends of the runway in the safety zone.
Density of steel wire rope materials ρ 7.8·10-6 kg/mm3 11.
[6] Hernando J.L. and Co., Carrier Suitability of Land-Based Aircraft, 28th International Congress of the Aeronautical Sciences, ICAS 2012, Brisbane, Australia, 2012
[7] Bing Xu and Co., A three dimensional approach to model steel wire ropes used in high energy absorber apparatus, International Journal of Solids and Structures no. 51, Elsevier Ltd., 2014
Online since: August 2013
Authors: Yong Zhou, Shi Li
Analysis of Variable Section Piezoelectric Harvester
Yong Zhou1, a, Shi Li1, b
1 College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang, China
azzz_us@163.com, bli_shicn@yahoo.com.cn
Keywords: Piezoelectric Harvester, MEMS, Curved Beam, Finite Element Method
Abstract.
The material properties of PZT and PDM can be referenced in literature [6] and literature [14].
In ANSYS the polarization axis of the piezoelectric material should be along the z axis.
Sodano, A review of a power harvesting using piezoelectric materials (2003–2006),” Smart Mater.
Journal Vol. 9(2009 )
The material properties of PZT and PDM can be referenced in literature [6] and literature [14].
In ANSYS the polarization axis of the piezoelectric material should be along the z axis.
Sodano, A review of a power harvesting using piezoelectric materials (2003–2006),” Smart Mater.
Journal Vol. 9(2009 )
Online since: October 2022
Authors: Elvira B. Kolmachikhina, Konstantin D. Naumov, Dana I. Bludova
, Science. 351 (2016) 1253292
He, Leaching lithium from the anode electrode materials of spent lithium-ion batteries by hydrochloric acid (HCl), Waste Management. 51 (2016) 227-233
Hossaini, Dissolution kinetics of cathode of spent lithium ion battery in hydrochloric acid solutions, Journal of The Institution of Engineers (India): Series D: Metallurgical & Materials and Mining Engineering. 94(1) (2013) 13-16
Fujita, Leaching of cathode materials from spent lithium-ion batteries by using a mixture of ascorbic acid and HNO3, Hydrometallurgy. 205 (2021) 105746
Zhou, Recovery of valuable metals from waste cathode materials of spent lithium-ion batteries using mild phosphoric acid, J. of Hazard.
He, Leaching lithium from the anode electrode materials of spent lithium-ion batteries by hydrochloric acid (HCl), Waste Management. 51 (2016) 227-233
Hossaini, Dissolution kinetics of cathode of spent lithium ion battery in hydrochloric acid solutions, Journal of The Institution of Engineers (India): Series D: Metallurgical & Materials and Mining Engineering. 94(1) (2013) 13-16
Fujita, Leaching of cathode materials from spent lithium-ion batteries by using a mixture of ascorbic acid and HNO3, Hydrometallurgy. 205 (2021) 105746
Zhou, Recovery of valuable metals from waste cathode materials of spent lithium-ion batteries using mild phosphoric acid, J. of Hazard.
Online since: November 2003
Authors: Sun Keun Hwang, Akihiko Chiba, Gil-Su Hong, Won Yong Kim, Mok Soon Kim
Journal Citation (to be inserted by the publisher)
Copyright by Trans Tech Publications
Precipitation Behavior and Mechanical Property of a Supersaturated
Co-Based Superalloy
Gil-Su Hong
1, Mok-Soon Kim
1*, Won-Yong Kim
2, Akihiko Chiba
3 and
Sun-Keun Hwang
1
1
School of Materials Science and Engineering, Inha University, Inchon 402-751, Korea,
mskim@inha.ac.kr
2
Korea Institute of Industrial Technology, Inchon 404-251, Korea
3
Department of Welfare Engineering, Iwate University, Morioka 020-8551, Japan
Keywords: Co-Based Alloys, Superalloys, Supersaturation, Precipitation, Mechanical Property,
Cold Rolling, Aging, Twinning.
Microstructure, precipitation behavior and mechanical property of the supersaturated single-phase Co-based superalloy are investigated in terms of materials processing, and aging condition.
Introduction The recent trend of reducing atmospheric pollution and less energy consumption requires advanced high temperature materials.
Therefore, to maintain a high strength without exhibiting a ductility loss, some alloys have been developed by means of a control of constituent elements and materials processing.
Deevi : Heat-Resistant Materials II (ASM International Materials Park, 1995)
Microstructure, precipitation behavior and mechanical property of the supersaturated single-phase Co-based superalloy are investigated in terms of materials processing, and aging condition.
Introduction The recent trend of reducing atmospheric pollution and less energy consumption requires advanced high temperature materials.
Therefore, to maintain a high strength without exhibiting a ductility loss, some alloys have been developed by means of a control of constituent elements and materials processing.
Deevi : Heat-Resistant Materials II (ASM International Materials Park, 1995)