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Start Over Author "Li, Yu-Ping" Publisher springer science and business media llc
20 results on '"Li, Yu-Ping"'

9. Thermal deformation simulation for an internal grinding cirque by finite element method

Author

Zhou Li-qun, Li Yu-ping, and Chen Zhi-gang

Subjects
Surface (mathematics), geography, Engineering, geography.geographical_feature_category, Field (physics), business.industry, Mechanical Engineering, Computation, Cirque, Mechanical engineering, Geometry, Industrial and Manufacturing Engineering, Finite element method, Clamping, Computer Science Applications, Grinding, Control and Systems Engineering, Thermal, business, Software
Abstract

An implicit finite-element code is employed to study the internal grinding process of carbon steel Q235 cirque, and its temperature field and thermal deformation are obtained. The method of thermal load calculation is proposed, a 2D finite element model is developed, and analysis steps are introduced. The diameter of the cirque is 150 mm and that of the inner hole is 56.24 mm. By adopting the clamps of surface locating and three-jaw chuck, it is found that, during the grinding process, the workpiece is in an elastic–plastic state, far from thermal-softening state. The thermal deformation of the ground cirque is basically symmetrical in a diamond shape, but the deformations of the inner circle and the outer circle are not uniform, and the inner circle thermal deformation may be negative or positive. Such different thermal displacements will produce shape error and dimension error in the inner hole. Through comparison of the two clamping modes, it is found that the precision of the surface locating is better than the three-jaw chuck. The symmetrical property of the thermal deformation of the cirque and the comparison of two clamping modes indicate that the computation is valid.

Published
2008

12. A mechanics model for stamping a sheet on elastic die with large deformation

Author

Li Yu-ping, Zhou Yi-chun, and Zhou Li-qun

Subjects
Mechanics model, Large deformation, Materials science, business.industry, General Mathematics, Computation, General Engineering, Structural engineering, Stamping, Elastic plastic, Compatibility (mechanics), Large deflection, business, MATLAB, computer, computer.programming_language
Abstract

A semi-analytical method was proposed to solve the mechanics problem of stamping a sheet on elastic die. The sheet was divided into four parts according to its deformation and contact with the punch and elastic die. Analytical solutions were derived individually for each part by using elastic large deflection and plastic large deformation. Solutions were found out with MATLAB by developing a numerical algorithm. Interface forces were obtained by iteration under the compatibility conditions between the neighboring parts of the sheet. Computation shows the method is efficient.

Published
2002

14. Comparative genetic diversity and genetic structure of three chinese silkworm species Bombyx mori L. (Lepidoptera: Bombycidae), Antheraea pernyi Guérin-Meneville and Samia cynthia ricini donovan (Lepidoptera: Saturniidae)

Author

Liu, Yan-Qun, primary, Qin, Li, additional, li, Yu-Ping, additional, Wang, Huan, additional, Xia, Run-Xi, additional, Qi, Yong-Hong, additional, li, Xi-Sheng, additional, Lu, Cheng, additional, and Xiang, Zhong-Huai, additional

Published
2010
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15. Role of NMDA receptor–dependent activation of SREBP1 in excitotoxic and ischemic neuronal injuries

Author

Taghibiglou, Changiz, primary, Martin, Henry G S, additional, Lai, Ted Weita, additional, Cho, Taesup, additional, Prasad, Shiv, additional, Kojic, Luba, additional, Lu, Jie, additional, Liu, Yitao, additional, Lo, Edmund, additional, Zhang, Shu, additional, Wu, Julia Z Z, additional, Li, Yu Ping, additional, Wen, Yan Hua, additional, Imm, Joon-Hyuk, additional, Cynader, Max S, additional, and Wang, Yu Tian, additional

Published
2009
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