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According to the mechanical characteristics of the frame, materials are selected and manufacturability requirements are limited.
Frame Structural Design and Materials According to the mechanical characteristics and structural characteristics of the frame, space rigid frame structure is made up of girders and beams.
Considering material mechanical properties, welding technology and economy factors, Q235B materials with the cold bending hollow structural steel of the square tube is chosen to build the frame.
In the chemical composition of materials, impurities are not allowed to appear, and wall thickness should be evenly distributed among the whole frame, otherwise abnormal fracture may appear frequently in the use process.
References [1]XU Peixia, CAI Bing-fang：Structural optimization design on frame of all topography vehicle based on A�SYS, JOURNAL OF MACHINE DESIGN,(2008),in press

It’s a fundamental theory problem to obtain the failure modes, law, mechanism and ultimate parameters of tribo-parts under sliding/rolling contact, as well as to study the relationship among materials, lubrication and working condition.
It indicates that some materials transferred from the slow disk surface to the fast disk one.
Wang, Q.J.Ge: Journal of Harbin Bearing Vol.27 (2006), p. 3 (In Chinese) [2] J.S.
Snidle: Journal of Tribology Vol.117(1995), p. 482 [5] M.
Subramonian, Bikramjit Basu: Materials Science and Engineering Vol.415(2006), p. 72 [9] Z.G.

Finally, in variable-costing only variable costs are considered, which in most cases includes only the direct costs (materials and direct labor).
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 31(3), 181-85
Journal of Business & Industrial Marketing, 15(1), 23–33
Journal of Product & Brand Management, 15(6), 358-66
Technical machining of materials.

One should mention that the design process could be analyzed not only from the perspective of the partition of the main system but also from the perspective of design, material and assembly features [1, 3].
Beitz, Science of Constructing, Methods and Applications, Springer Verlag, Berlin, 1997 (in German)
Gwiazda, Technical project management using quality methods, Journal of Achievements in Materials and Manufacturing Engineering 31(2) (2008) 739–746

Material and methods The present study is development of variable stiffness bracing system which is applicable in framed structures to restraint vibration effects on structures and protect them against dynamic loads.
Acknowledgement This work received financial support from the Ministry of Science, Technology and Innovation of Malaysia under Research Project No. 5524254.
Journal of structural engineering, 134(1), 3-21. (2008)
Journal of Sound and Vibration, 330(12), 2733-2746. (2011)
Industrial Robot: An International Journal, 36(1), 84–90.(2009)

Materials and Method The study used quantitative analysis method.
Elhassan, Economic analysis of solid waste treatment plants using pyrolysis, American Journal of Energy Engineering 3(2) (2015) pp.11-15
Degefa, Heavy metal pollution of soil around solid waste dumping sites and its impact on adjacent community: the case of Shashemane open landfill, Ethiopia, Journal of Environment and Earth Science 5(15) (2015) pp.169-178
McKay, Dioxin characterisation, formation and minimisation during municipal solid waste (MSW) incineration, Chemical Engineering Journal 86(3) (2002) pp.343-368
Helsen, The crucial role of Waste-to-Energy technologies in enhanced landfill mining: a technology review, Journal of Cleaner Production 55 (2013) pp.10-23

The joint fissure in the rock stratum was developed substantially, thus the basic material source conditions and favorable structural planes for the occurrence of metamorphic phenomena were provided.
Acknowledgements This work was supported by the National Natural Science Foundation of China (No.41101164), the Foundation of Sichuan Educational Committee of China(No.10ZA015) and the Youth Foundation of Southwest University of Science and Technology(No. 11ZX3110).
Chinese Journal of Rock Mechanics and Engineering, Vol.21,pp.1368-1371,Sep.2002
Li, “Fault effect analysis of geo-hazard triggered by Wenchuan earthquake”, Journal of Engineering Geology, Vol.17, pp.19~28,2009
J., “The exodus evacuation model applied to building evacuation scenarios,” Journal of Fire Protection Engineering, Vol.8, pp.65-84, 1996

Fig.1: Ramp Injectors Material and Methods.
Vitt, Vortex Generation and Mixing in Three-Dimensional Supersonic Combustors, Journal of Propulsion and Power, Vol. 11.
Nejad, An Investigation of Advanced Fuel Injection Schemes for Scramjet Combustion, Proceedings of the 36th AIAA Aerospace Sciences Meeting and Exhibit, No.
Oevermann, Numerical Investigation of Turbulent Hydrogen Combustion in a SCRAMJET using Flamelet Modeling, Aerospace Science and Technology, Vol. 4, 463-480, (2000)
Singh, CFD Analysis of Supersonic Combustion Using Diamond Shaped Strut Injector With standard K-Є Non-Premixed Turbulence Model, International Journal of Advanced Trends in Computer Science and Engineering, Volume 1 No.-1, PP. 33-42, (March- April 2012).

Plastic, a non-biodegradable material has always been a concern to the environment and people.
According to a study published in Journal of Science by Jambeck et al., 275 million metric tonnes (MT) of plastic waste was generated in 192 coastal countries in 2010, with 4.8 to 12.7 million MT entering the oceans [5].
Methodology Materials and Chemicals Commercial non-biodegradable waste plastic bags made from poly (vinly chloride) were collected from cafeteria and used as the carbon precursor.
Series: Materials Science and Engineering, 358 (2018) 012014
Series: Materials Science and Engineering, 736 (2020) 042038

The model parameters of 1Cr-0.5Mo-0.25V stainless steel bolting material at 500°C have been determined, and the creep and stress relaxation behaviors have been calculated.
The relationship between the residual stress and time during stress relaxation of various different materials has been derived from the creep equations.
(3) where E is Young’s modulus, A, σ0, n, α, β are material parameters, H is the strain hardening function.
References [1] Jinquan Guo: Research on the Analysis and Prediction Methodology of High Temperature Stress Relaxation(Dissertation, East China University of Science and Technology, China, 2010) [2] M.
Price: Journal for Global Optimization Vol. 11(1997), p.341 [9] NRIM Creep Data Sheet No. 44, National Research Institute for Metals, Tokyo (1997).