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Table 5 Comparison of displacement and stress for 3 conditions 　 Front wheel skid Intelligent four-wheel driving Mandatory four-wheel driving Stress(MPa) 98.431 94.354 64.961 Displacement(mm) 0.039302 0.03838 0.025637 By searching Materials about ADC12 aluminum, we can know that its allowable strength is 310Mpa.
Acknowledgements This research gets auspice from Anhui provincial science and technology department under grant number 1101C0603044.
Journal of Vibration Engineering,2010.12,23(6):665-669
Journal of Vibration, Measurement and Diagnosis, 2009. 29(4); 441-444
Journal of Hefei University of technology, 2009. 32(18):194-195.

The elastic material property of structure layer is adopted to simulate the static model, without regard to damping relation matrix coefficients, the detail material property of each layer is shown in Table 2.
Science Foundation in China. 1998, NO.02, P92-97
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Gravel pile, cushion and soil are considered for elastic-plastic material.
Acknowledgements The work described in this paper was supported by the National western traffic scientific & technological program of China (No.200531881213), science & technology project of Henan transport department (No.2010PII10) , and Education Department of Henan Province Natural Science Research Project (No.2011A580001).
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Secondly, material property is added to part.
Material Poisson's ratio is 0.3.
Material density is 7800.
[2] Su Pengcheng,Wang Wan-shan, Huo Jun-zhou, Optimal Layout Design of Cutters on Tunnel boring Machine[J], Journal of Northeastern University (Natural Science), 2010(6), 877-881 (In Chinese) [3] Q.M.
Tang, Numerical simulation of the rock fragmentation process induced by indenters[J],International Journal of Rock Mechanics & Mining Sciences,39(2002)491-505

The main objective was to find a way to economically and efficiently separate materials usable for industry from materials that would need to be disposed of in a landfill.
Some raw materials will be imported.
In our case, to recycle the raw materials extracted during tunnelling.
Benedikt, Applicability of excavated rock material, A European technical review implying opportunities for future tunnelling projects, Journal of Cleaner Production.
Kuschel, Rock Material Recycling in Tunnel Engineering, Applied Sciences 2020, 10(8), p.2722. https://doi.org/10.3390/app10082722

Effects of Sb or Ba Addition on the Piezoelectric Properties of PZT Shunmin Hu1, a, Guigui Peng1,b, Deyi Zheng2,3,c, 1Guizhou University, Guizhou Province, China 2Northeastern University,LiaoningProvince, China 3China Zhenhua(GROUP) Science& Technology CO.
,LTD., Guizhou Province, China aqianyuqianxun45@163.com, bpgg1989@163.com, czhengdeyi@hotmail.com Keywords: Lead zirconate titanate, PZT, antimony (Sb) doping, barium (Ba) doping Abstract:Lead zirconate titanate (PZT) materials are wildly used in aviation, industry and our daily life.
Therefore, a high piezoelectric constant of PZT material will be achieved, which enhances the performance of such equipment.In this project, antimony(Sb)and barium (Ba) elementshave been doped into the bulk PZT materialto improve the piezoelectric properties of PZT material.
Acknowledgements This work was financially supported by the Northeastern University post-doctoral mobile stations with China Zhenhua(GROUP) Science& Technology CO.
Effects of Manganese Addition on Piezoelectric Properties of “Hard” Lead Zirconate Titanate[J].Journal of Inorganic Materials, 2000(2):293-294

Chnical characteristics of raw materials Asphalt.
Acknowledgements The authors appreciate the support of National Natural Science Foundation of China.
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Fig. 4 Fault Tree Fig. 5 Series-parallel system of the cable-stayed bridge Due to lack of materials, the strength degradation of stay cables only caused by corrosion and broken wire is considered.
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