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Discrete Element Method (DEM) simulation is transforming the business of designing and optimizing equipment for the handling and processing of bulk materials.
The use of simplified particle shapes and contact interactions is needed in order to focus on the collective behavior of particles which is at the origin of many specific properties of granular materials.
Acknowledgements This work was financially supported by the Education Department Foundation of Yunnan Province (2012Y541), and Analysis and Test Foundation of Kunming University of Science & Technology (20130574/20130575), and the National Natural Science Foundation (51165013) References [1] E.Azema etc. : submitted to EUROPEAN PHYSICAL JOURNAL E，2008（26）：327-335
[6] E.Azema : submitted to Mechanics of Materials，2009（41）729-741
Advanced Materials Research.

Introduction Polyvinyl chloride is a thermoplastic polymer degraded during consumption, amorphous or weakly crystalline, main representative of the chloropolymer family, It is prepared from two raw materials: 57% sea salt (NaCl) and 43% oil; it is the only plastic material made up of more than 50% of raw material of mineral origin [1].
Fatigue of materials and structure: application to design.
El Ghorba, Change of experimental young’s modulus with increasing temperature for an abs material subjected to tensile test, ARPN Journal of Engineering and Applied Sciences, VOL. 14, NO. 3, FEBRUARY 2019
Temperature and weld-line effects on mechanical properties of CPVC, Journal of Materials Processing Technology 142 (2003) 247–255 [9].
Bui Quoc T., Dubuc J., Bazergui A., et Biron A, Cumulative fatigue damage under strain controlled, Journal of Material 6 (3) (1986), 718-737

The formation process of goaf was dynamically simulated by similar material simulation esperiment.
Similar material select quartz sand, river sand, mica Fig.1 Model one Fig.2 Model two aggregate, lime, gypsum, calcium carbonate cementing materials to do, take the original loess surface to be simulated, the choice to do retarder borax , borax solution access to the principle of concentration of 1.0 %.
Acknowledgements This work was financially supported by The National Natural Science Foundation (51078250).
References [1] Y.M.Lin: Simulation of experimental rock mechanics (China coal industry publishing house, Chinese 1984) [2] H.P.Xie: Introduction to Fractal and Rock Mechanics (science press, Chinese 1996) [3] X.Y.Liu and Y.B.Zhang: Journal of Taiyuan University of technology.
Vol.35 (1) (2004), p. 29, in Chinese [4] G.X.Cui: Similarity Theory and Model Experiment (China University of mining and technology press, Chinese1990) [5] M.G.Qian and J.L.Xu: Journal of coal science and engineering .Vol.23 (5) (1998), p.466, in Chinese

Journal of Environmental Science and Technology 11(4), (2018) 209 – 219
Journal of Environmental Engineering and Science 1(4), (2002) 247-264
Journal of hazardous materials 243, (2012) 257-264
Microporous and Mesoporous Materials. 225, (2016) 303-311 [69] B.
Journal of Hazardous Materials 163(1), (2009) 109-114

The degradation of polycarbonate (PC) food contact materials was studied based on analysis with GC-MS, FTIR, UV-Vis and TG techniques.
It was evident that the processing temperature of the materials significantly enhanced the release of bisphenol A, an endocrine disruptor.
Conclusions Processing temperature has significant influence on the release of environmental hormone BPA contained in food contact materials.
Journal of Changzhou University(Natural Science Edition) 2010,22(2):20-23
[8] GB/T 5009.99-2003.Method for Analysis of Hygienic Standard of Polycarbonate ResinUsed as Food Containers and Packaging Materials

These data are necessary to determine the material mechanical properties and must be suitably processed.
These data from an experimental measurement were used to determine the mechanical material properties.
The material model (material parameters) is optimized by following successive FEM simulations before reaching the required minimum deviation (accuracy).
Sun, Determining elastic-plastic properties from indentation data obtained from FE simulations and experimental results, International Journal of Mechanical Sciences 62 (2012) 34-46
Oliveira, Comparison between Berkovich, Vickers and conical indentation tests: A three-dimensional numerical simulation study, International Journal of Solid and Structures 46 (2009) 1095-1104.

Compared with science students, mathematic learning content is less than normal for liberal arts students.
Adjusting Teaching Content In recent years, a variety of materials continue to emerge, which can be said to be overwhelming.
Theachers should break the traditional knowledge based on the teacher-led, the teaching materials and the teacher-based; should have a change from the knowledge-based and competency-based to people’s standard which based on the student group to achieve the teaching of human nature.
In addition to application in the natural sciences and social sciences etc., mathematics is essential for the human ability and overall quality to shape.
[3] Jianhunag Wu, Survey and Analysis on Status of College Mathematic Education: Journal of Mathematic Education, vol.16 (2007), p.36-39

The attributes can be divided into qualitative attributes (including shape, production stability, materials) and quantitative attributes (including size, roughness and accuracy).
Journal of Central South University of Technology, 12: pp18-24, 2005
Journal of Cleaner Production ,87: pp 245-254,2015
CIRP Journal of Manufacturing Science and Technology, 4:pp161-169,2011
Journal of Mechanical Engineering,49:pp87-95,2013.

It is brittle material and so, it is hard to machine.
In recent years, many researchers studied the ductile regime removal of the brittle materials through indentation, scratch, single point diamond machining and precision grinding experiments [1,2].
Zarudi: International Journal of Mechanical Sciences, Vol.43 (2001), pp.1985
Duduch: Journal of Materials Science Letters, Vol.18 (1999), pp.1185
Kirscht: Semiconductor Science Technology, Vol.14 (1999), pp.936

Al-Saie et al. [12] used Co3O4 and Fe2O3 as starting materials and after milling of 20 h, the Fe2O3 remains, while Co3O4 phase disappears and CoFe2O4 phase is formed.
In the case of ferromagnetic materials, heat dissipation is due mainly to hysteresis losses.
Journal of Materials Science. 42(2007) 2126-2131 [14] R.
Journal of Magnetism and Magnetic Materials. 311 (2007) 187-192
Advances in Colloid and Interface Science. 166 (2011) 8-23