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820 n A Textbook of Machine Design. 23.1 Introduction. A spring is defined as an elastic body, whose function is to distort when loaded and to recover itsSprings are energy management devices. Spring design is challenging because of the conflicting priorities in a given application. Spring Engineers of Houston is Helical Compression Spring Design for Fatigue Loading. ▫. Extension Springs. ▫. Helical Coil Torsion Springs. 2. Page 3. Mechanical Springs. DESIGN OF SPRINGS Springs are flexible machine elements Definition of spring A spring is an elastic object used to store mechanical energy. The design of helical-coil springs involves selection of a material, and determination of the wire diameter, d, mean coil radius, R, number of active coils, VN, Equilibrium forces at cut section anywhere in the body of the spring indicates direct shear and torsion. Shigley's Mechanical Engineering Design. Fig. 10–1 Considerations Prior to the Spring Design Process. It is important when designing springs to adhere to proper procedures and design considerations. Helical Compression Spring Design for Static Service. ▫ Critical Frequency of Helical Springs. ▫ Fatigue Loading of Helical Compression Springs.