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Obviously, at any removal rates, the grinding generated much lower specific tangential force for work materials.
Huang: Materials Science and Engineering, Vol.345 (2003), pp.155-163
Xu: Key Engineering Materials, Vols.259-260 (2004), pp.6-9
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Xu: Journal of Material Process Technology, Vol.129 (2002), pp.118-122

Material parameters were listed in Table 1.
Zhao: Journal of Shanghai Jiaotong University, Vol. 37-12 (2003), p. 1887-1890
Zhang: Journal of Plasticity Engineering, Vol. 12-3 (2005), p. 83-87
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It is very difficult to be truly simulated because the calculation of super elastic sealing performance involves many aspects of theoretical knowledge of solid mechanics, tribology and polymer materials science.Taking into account the bud shaped sealing ring in the structure and workforce are symmetrical, therefore, the sealing pair is simplified to a 2-dimensional model . 1.1 The super elasticity theory Lei ring is squeezed between the column piston rod and the cylinder, which can be seen as the contact problem of super elastic material and metal material.Therefore, the finite element analysis of the Lei-ring is the analysis of contact nonlinear hyper elastic material.
The strain energy density function of hyper elastic materials is as following: （1） In the formula, C10 and C01 are Mooney-Rivlin coefficient and are normal.andare the first and second invariant of stress tensor,and they can be obtained from the empirical formula according to the rubber material hardness (or the modulus of elasticity) .
[2]Hu Dianyin,Wang Rongqiao,Ren Quanbinetal Finite element analysis of O-ring seal structure [J].Journal of Beijing University of Aeronautics and Astronautics,2005,31(2) : 255-260
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Traditional staircase is the main testing method to determinate fatigue limit of materials.
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Hong Du Science and Technology, 1995, 8, 33-42 [7] Chinese National Standard: Metallic materials Fatigue testing- Axial force controlled method, GB/T3075-2008
[8] Chinese National Standard: Metallic materials Fatigue testing Statistical planning and analysis of data, GB/T24176-2009.

Thus, is dislocation slip is impeded, the life for materials will be lengthen, namely, the performance of material can be improved.
And the analysis method adopted in this paper can be used in other materials too.
References [1] Zhang Deming, Chen Guiqing, Han Jiecai, Meng Songhe, Review on studies of gamma TiAl-based high-temperature structural materials, Journal of the Chinese Rare Earth Society, A23(2005)163-167
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Experimental Materials Methyl methacrylate(MMA)，n-butylacrylate(n-BA)，methacrylic acid n-butyl ester(MBA) and ethyl hexyl acrylate(2-EHA)were used as monomers.
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Test Materials and Methods The Experimental Materials.
Progress in Materials Science, 2011, 57(2) : 44-47
Journal of Materials and Heat Treatment, 2020, 41(07): 105-110. in Chinese
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Materials Transactions, JIM, Vol.40 (1999), p.723-736
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Journal of Advanced Concrete Technology. 2006, 4(2):225-229
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Influence of Side Chain Density of Polycarboxylate Superplasticizer on Hydration of Cement [J]．Bulletin of the Chinese Ceramic Society. 2009,28(6)：1254-1258 [22] Ma Baoguo, Zhang Man, Tan Hongbo et al．Influence of Side Chain Density of Polycarboxylate Superplasticizer on Characteristics of Cement early Hydration[J]．New Construction Materials. 2008,6:41-43 [23] Xiao Xueqing, Huang Xuehong, Hu Yujuan.
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Influence of Calcined Temperature on the Piezoelectric Properties of (Na0.48K0.47Li0.05)NbO3 Lead-free Piezoelectric Ceramics Doped with CuO Xinyou Huang 1,2, a, Musheng Huang 1,2,b and Chunhua Gao1,c 1 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China 2 Jiangsu Province Key Laboratory of High-end Materials, Zhenjiang 212013, China ahuangxy@ujs.edu.cn, b969738435@qq.com, chxy@ujs.edu.cn Keywords: lead-free piezoelectric ceramics; lithium sodium potassium niobate; calcined temperature; CuO doped Abstract.
So, the study of lead-free piezoelectric ceramic material is the inevitable trend in the research of piezoelectric materials.
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Lin, J.G.Zhu: Journal of Functional Materials Vol. 38 (2007), p. 1225 [7] T.Tani: J.