College of Material Science and Technology;
Nanjing University of Aeronautics and Astronautics;
Nanjing 211100;
China;
College of Mechanical and Electrical Engineering;
Nanjing University of Aeronautics and Astronautics;
Nanjing 210016;
China;
Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering;
Nanjing University of Aeronautics and Astronautics;
Nanjing 211100;
China;
Mechanical Engineering Department;
Faculty of Engineering-Helwan;
Helwan University;
Cairo;
Egypt;
Nanjing Golden Dragon Bus Co.;
Ltd;
Nanjing 210012;
China;
Bending die; Cross-section distortion; Rolling friction; Sliding friction; Spherical bearing force; Wall thickness;