Search results

Introduction The Control of fracture and brittleness is one of key issues of development of engineering materials which are intrinsically brittle or extrinsically brittle due to detrimental effects associated with service condition and/or environment.
Now the grain boundary engineering has been widely accepted as a new approach to materials design and development of high performance structural and functional materials [8-10].
Quite recently the grain boundary engineering has been well evidenced to be so powerful to control intergranular fracture and brittleness of brittle polycrystalline structural materials and even for functional materials [6-8].
The State of the Art of Grain Boundary Engineering for Fracture Control 5.1 Grain Boundary Engineering for Brittle Materials Here we just briefly introduce our recent works on grain boundary engineering for fracture control in ceramics such as SiC [21] and alumina [22] which are normally very brittle, but of engineering importance.
Tamari: Key Engineering Materials, Vol.261-263 (2004), p.999

Research on the Removal Mechanism of Engineering Ceramics Based on Energy Density X.L.
Yu 2,e 1 National Key Laboratory for Equipment Remanufacturing, Academy of Armored Forces Engineering, Beijing, China, 100072 2 Faculty of Engineering, Ningbo University, Ningbo, China, 315211 a tianxli719251@sohu.com, b zhang_baoguo@126.com, cyjf-beijing@163.com, dpuzzlele@tom.com, e yuaibing@126.com Keywords: Engineering ceramics; high-energy-density; removal mechanism; ablation; erosion Abstract.
Based on the calculation of energy density for several kinds of non-traditional machining process of engineering ceramics, the material removal mechanism for ceramics was studied.
Therefore, engineering ceramics are categorized as one of the most difficult materials to machine effectively.
Lu: Journal of Materials Processing Technology, Vol.129 (2002), p.152 [5] J.Wang: Abrasive Waterjet Machining of Engineering Materials (Trans Tech Publications, Switzerland 2003)

Analysis on Key Strata’s Subsidence in Paste-Like filling face Jian Hao 1,a, Yongkui Shi 2,b, Kuan Liu 3,c 1College of Resource and Environment Engineering, Shan Dong University of Science and Technology, Qingdao, 266590 2College of Resource and Environment Engineering, Shan Dong University of Science and Technology, Qingdao, 266590 3College of Resource and Environment Engineering, Shan Dong University of Science and Technology, Qingdao, 266590 amkaqjs@163.com, bshiyongkui@163.com, cliukuan19880606@163.com Keywords: Paste-Like; Backfill Mining; Key Strata; Subsidence Abstract.
Theoretical analysis and engineering practice indicate that under certain mining depth, there is a great relationship between the subsidence of the key strata and modulus of elasticity, moreover, the more larger modulus of elasticity is, the more smaller the subsidence value of key strata is.
Engineering situation The NO.8 seam, thickness of 2m on average, depth of 550m ,dip of 12°～29°, hardness’s coefficient of 1.5, is mined by 81006 working face of Caozhuang Coal Mine.
In order to prevent water inrush and control the subsidence of the strata, the gob was filled with the paste-like materials.
The reason is that although the filling materials had been filled into the gob, it could not be ensured the filling rate was 100%.

Application of fracture mechanics in ocean engineering structures quality control JianpingChen1,2,a, Shengsun Hu1,b, Junqi Shen1,c, Bin Wang2,d and Deqing Li2,e 1Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China 2Heibei Huabei Petroleum Engineering Construction Co., Ltd., Renqiu 062552, China aHB-JP@163.com, bhuss@tju.edu.cn, cshenjunqi@tju.edu.cn, dGJ-JP-CJP@cnpc.com.cn eGJ-3C-LDQ@cnpc.com.cn Keywords: ocean engineering structures, ECA, welding defect, PWHT Abstract.
This paper introduced the application of Engineering Critical Assessment (ECA) technology based on fracture mechanics in ocean engineering structures.
It is not convenient universal implementation because of lack of the stress intensity factor expression applied in the key parts of Marine engineering structure, but it will improve gradually by enriching the stress intensity factor expressions of key parts of typical ocean engineering structure.
It means that materials immune to stress corrosion, which is determined by traditional method, only show that these materials does not produce crack source in stress corrosion, but it does not reflect whether the existing cracks will spread under stress corrosion conditions.
Many experimental results or engineering practice prove that some materials may be high sensitive to stress corrosion if we make these materials that are so-called immune from stress corrosion into samples with cracks.

Lightweight engineering with advanced composite materials - ceramic and metal matrix composites - Rainer Gadow a Institute for Manufacturing Technologies of Ceramic Components and Composites, University of Stuttgart, Allmandring 7b, D-70569 Stuttgart, Germany a rainer.gadow@ifkb.uni-stuttgart.de Keywords: lightweight engineering, ceramic composites, metal matrix composites, sheet molding compounding, thixoforging, thermal spraying, disk brake rotor.
Light weight engineering by materials and by design are central challenges in modern product development for automotive applications.
High strength structural ceramics and components were in the focus of R & D in automobile development since the 1970's and CMC have dominated advanced materials engineering in aerospace applications.
A comparative summary of friction materials properties is shown in Table 1.
Summary and conclusion Fiber composites with ceramic and with light metal matrix are key components in light weight engineering by advanced materials in automotive research and development.

Applied Research on Foamed Asphalt Cold-regenerating Technique in Overhaul Engineering of Binshi Expressway Hongyun Wei1, a, Weifeng Zhou2,b Jianyong Sun3,c 1Management and Economics Department, Tianjin University, Tianjin , PRC 2Tianjin Municipal & Highway Engineering Research Institute, Tianjin , PRC Management and Economics Department, Tianjin University, Tianjin PRC 3Tianjin Municipal & Highway Engineering Research Institute, Tianjin , PRC awhy_shizj@126.com, bzhouweifeng0000@126.com, csunjianyong_1981@163.com Keywords: foamed asphalt cold-regenerating, construction technology, overhaul engineering Abstract:Foamed asphalt cold-regenerating technique is used to study the overhaul engineering of Binshi Expressway in 2012 (Tianjin Section) to analyze influences of different milling parameters upon the grading difference of materials of recovered asphalt pavement (RAP); and vibration compaction is used to confirm the maximum dry density and the optimum water content of regenerating
Site Construction Technology The overhaul engineering of Binshi Expressway lasts 10.144km from Tangshan→Tianjin K174+780～K185+430.
A 1.5m partition is built between materials of different specifications for avoidance of mixing.
Recheck materials and guarantee to meet operating requirements
Summary The foamed asphalt cold-regenerating technique has been successfully applied in the overhaul engineering of Binshi Expressway.

We argue that VR can be a key technology to support the FoF at all levels of the Systems Engineering approach, either directly by applying it in standard engineering processes, or indirectly by leveraging other useful technologies.
Energy and material efficient processes for optimized consumption of resources c.
Resource optimization: ensuring the supply of raw materials and energy requires the reduction of the overall consumption.
Based on the proposed categories of recommendations in section 2.5, this section compiles the potential usages of VR within a number of key Systems Engineering processes.
Williams “Virtual Reality in Engineering Education- the Future of Creative Learning”, presented at IEEE Global Engineering Education Conference, April 2011, Amman

The special edition of the journal “Key Engineering Materials” contains papers that were presented to the 58th International Conference of Materials Science and Applied Chemistry (MSAC 2017, 20th October, 2017, Riga, Latvia).
The main objective of this collection is to present the latest scientific findings obtained in the fields of materials science and chemistry.
Biomaterials, Medicinal Chemistry, Waste Recycling, Environmental Engineering, Biotechnologies, Polymers and Composites, Membranes, Thin Films, Functional Ceramics and Metal Oxides, Steels and Alloys, Textile Technology

However, when the contractor combines the engineering change and the unbalanced bidding strategy, the lack of knowledge for the change of project state is the key factor that the contractor can not achieve income-generating.
In construction plan, the contractor finds the opportunity mainly come from durations quality requirements, technical complexity, and whether to adopt the new technology and new materials [4] [5,6] ; In design drawings , the contractor find the opportunity mainly come from weather the project characteristic description is in line with the drawings[7,8].
Opportunities of contractor based on the engineering changes are shown in Table 1.
The owners have evaluation criteria of engineering change .If the expected engineering change can not reach the owners expectation ,the anticipated engineering change will not be triggered.
Ningxia Engineering Technology, 2009,8 (4) :379-382.

Yu1*, Yanfei Xiang2, Min Wang2 and Liming Yang2 1 Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 2 Mechanics and Material Science Research Center, Ningbo University, Ningbo, Zhejiang Province, 315211, P.R.
The work is valuable to engineering designs and applications, as well as to the further studies of the topic. 1.
For cellular materials, the concept of ESR is similar to the “densification strain”
Obviously, these KPIs can be applied in evaluating other kinds of energy absorbing strictures and materials, including cellular materials, to guide their design and archive a certain degree of optimization.
Yu, Energy Absorption of Structures and Materials, Woodhead, 2003