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Analysis and Optimization of Forming Quality of 3D Concrete Printing Materials Liu Shiping1,a, Ma Ziyan1,b*, Xia Wenjie1,c and Huang Yuanjing1,d 1School of Mechanical Science and Engineering, Huazhong University of Science and Technology, China aliushiping@hust.edu.cn, bM202070771@hust.edu.cn, c M202078368@hust.edu.cn, dM201970371@hust.edu.cn Keywords: 3D concrete printing; concrete material; forming quality Abstract. 3D concrete printing is a kind of construction method that takes concrete as processing material for extrusion forming.
In this paper, the error sources of concrete printed parts are discussed firstly, and the forming quality of the printed parts material is analyzed in combination with GD&T system and concrete structure engineering construction quality acceptance specifications.
At present, researchers have basically reached a partial consensus that the special rheology of concrete materials is one of the key factors leading to the deformation of the material under its own weight.
As a result, how to make the wet accumulation material have better fluidity and low plasticity is the key to the research of concrete materials.
Research on related aspects is the basis and key to improving the forming quality and technical construction of 3D concrete printing materials.

Reiter1,b 1 a, b Institute of Polymer Product Engineering, Johannes Kepler University Linz, Austria, zoltan.major@jku.at, martin.reiter@jku.at Keywords: polymers, pre-cracked Charpy specimen, instrumented impact tests, fracture toughness, Dynamic Key Curve method, crack tip opening displacement.
Abstract The fracture behavior of engineering polymers is usually characterized at high loading rates using Charpy specimens.
The corresponding equations and the materials parameters are listed elsewhere [1].
Due to the inherent time dependence of the polymeric materials, time (loading rate dependent) values were used.
Pavan), Mechanical Engineering Publ., London, pp. 93-102 (1995)

Magnetic material based on full-Heusler alloy Co2CrGa Hongpei Han1,a 1College of Electro-Information Engineering, Xuchang University, Xuchang, China ahhp102@163.com Keywords: Magnetic material; Full-Heusler alloy; Material engineering; First-principles Abstract.
Importantly, the calculated spin polarization around the Fermi level is very high up to 93.2%, which indicates that full-Heusler alloy Co2CrGa would be possibly applied to the field of the material engineering and spintronic devices.
From Fig. 3, we can conclude that the d electrons of Co and Cr atoms play a key role for the magnetism of the bulk Co2CrGa.
Importantly, the calculated spin polarization at the Fermi level in Table 1 indicates that full-Heusler alloy Co2CrGa is highly spin polarized ferromagnetic material which can be applied to the field of the material engineering and spintronic devices.
It is indicated that full-Heusler alloy Co2CrGa with the well magnetism and spin polarization would be possibly applied to the field of the material engineering and spintronic devices.

Department of Civil Engineering, Beihang University, Beijing, 100191, China, atjdoc@tom.com, bgaozhibin2000@163.com, czhangwen313@gmail.com Key Words: energy saving; temperature prediction; airport; winter construction; material Abstract: The technique of energy saving in airport winter construction is always the key and difficult point in the field of airport construction.
Usually construction units consume huge amounts of water, sand, stones, cement and other raw materials to meet requirements of temperature.
Fig. 2 Prediction of concrete temperature within 24h Fig. 3 Prediction of concrete material maturity (in the engineering environment) The Engineering Application in Tianjin Airport for the New Energy Conservation Technology The project of the second runway of Tianjin international Airport is one of the major construction projects in China and is of great strategic importance.
Fig.4 Interface for the optimal construction solution based on specialist-aided system According the data and key parameters, system can predict temperature and maturity of concrete material within 36h(in the engineering environment)with the expert solutions database and provide the suitable construction solution based on material temperature predicting and energy-saving control technique.
(2) Engineering energy-saving solution on that day a.

Critical Zone Approach for Structural Integrity of Power Engineering Components V.
Shlyannikov* Research Center for Power Engineering Problems of the Russian Academy of Sciences, Kazan, Russia * shlyannikov@mail.ru Abstract.
An engineering approach to the prediction of residual lifetime of turbine disks which is sensitive to the loading history at maintenance is proposed.
Mechanical properties of materials such as strength and ductility should be degraded by long-term service at different temperature.
Fig. 10. ( a) Local strains versus engineering stresses and (b) relations between critical fatigue fracture and applied strains.

For any objectives of rock engineering, excavation is indispensible.
The removed rock may be disposed as waste or aggregates as in civil engineering works or may be valuable minerals in mining.
Ha et al[3] developed an apparatus to study the size effects of unloading rock mass using aeromechanical model materials.
Removed materials.
Engineering rock mechanics –an introduction to the principles, Pergaman, (1997) [4] Goodman R.E.

This special edition focuses on materials engineering topics central to mechanical engineering and is dedicated to analysing the behaviour of structural materials, their processing methods, tribological properties, and the use of computational procedures for designing fluid systems.
The publication aims to equip readers with a well-rounded understanding of the nature of some key engineering solutions and principles driving innovation across multiple sectors of modern industry.
Steel, Alloy, Mechanical Properties, Fluid Mechanics, Wire Arc Additive Manufacturing, Turning, Laser Surface Hardening, Friction Stir Welding, Spot Welding, Spark Plasma Sintering, Mechanics of Materials, Tribology, Composite

Received 2010-06-11 Sponsored by the Henan Key Technologies R&D Programme (Grant: 2010C460002) and the Nanyang Key Technologies R&D Programme (Grant: 2009GG024) Application of reverse engineering technology in constructing prototype surface Dong-man Yua, Xiao-jing Li b, Yi Xiong c, Zhi-hua Gao d Non-traditional Machining Center, Henan Polytechni Institute, Nanyang, China 473009 a yudongman@126.com, b hnpilxj@126.com, csmartxiongyi@tom.com, dzhhgao@163.com Keywords: reverse engineering, constructing surface, coordinate measuring machine Abstract: Reverse engineering (RE) plays an important role in accelerating product research and borrowing ideals from other manufacturers.
A 3-D point sets registration method in reverse engineering.
Data & Knowledge Engineering, 2007, 635: 68-589 [4] Zhang Y.
Research into the engineering application of reverse engineering technology.
Journal of Materials Processing Technology, 2003. 139: 472-475 [5] Maresca P.

Superalloy Technology-A Perspective on Critical Innovations for Turbine Engines Robert Schafrik1,a and Robert Sprague2,b 1 GE Aviation, Materials & Process Engineering Department, 1 Neumann Way, M/D H85, Cincinnati, OH 45241, USA a robert.schafrik@ge.com 2 GE Aviation, Materials & Process Engineering Department, retired b robert.sprague@mac.com Keywords: high temperature structural materials, nickel-based superalloys, aeropropulsion, vacuum arc melting, investment casting, forging, materials modeling Abstract: High temperature structural materials, such as nickel-based superalloys, have contributed immensely to societal benefit.
Given the long time required for materials development, design engineers could not accurately foresee what material would be needed in 10 years since they were focused on engineering the next generation engine, not the generation afterwards.
Materials and process advancements have played a key role in this adventure.
The key elements of this new materials development paradigm include: • The new paradigm is system engineering centric, requiring that proposed materials capability be aligned to design requirements, and critical-to-success metrics identified that can focus resources to assure implementation success.
This linkage insures that the appropriate engineering design practices are in place to allow usage of the material

While performance and durability are the key features of any Material behavior, the greater the elasticity and flexibility ability the better the functioning capabilities.
A key mechanical behavior of materials is their Viscoelastic ability.
Summary Material selection is a critical task, and there are a number of engineering design criteria and facts to be considered when selecting a precise material for a particular purpose.
As this paper showed a key mechanical behavior of materials is their overall Viscoelastic ability.
 (2015) [8] Schmitz, Georg and Prahl, Ulrich: Integrative Computational Materials Engineering Concepts and Applications of a Modular Simulation Platform, Hoboken: Wiley (2012) [9] Chevalier, Yvon and Vinh Tuong, Jean: Mechanics of viscoelastic materials and wave dispersion, London : Hoboken: Wiley (2010) [10] U.S.