21-10-2016, 11:02 AM
1460300649-tmp22959leafspringabstract2137736807.docx (Size: 13.67 KB / Downloads: 5)
ABSTRACT
Originally Leaf spring called laminated or carriage spring, a leaf spring is a simple form of spring,commonly used for the suspension in wheeled vehicles.It is also one of the oldest forms of springing, dating back to medieval times.Sometimes referred to as a semi-elliptical spring or cart spring, it takes the form of a slenderarc-shaped length of spring steelof rectangularcross-section. The center of the arc provides location for the axle,while tie holesare provided at either end for attaching to the vehicle body. For very heavy vehicles,a leaf spring can be made from several leaves stacked on topof each other in several layers, often with progressively shorter leaves. Leaf springs can servelocating and to some extent damping as well as springing functions.A leaf spring can either be attached directly to the frame at both ends or attached directly atone end, usually the front, with the other end attached through a shackle, a short swinging arrm. The shackle takes up the tendency of the leaf spring to elongate when compressed and thus makes for softer springiness.
Leaf springs are subjected to varying stresses and vibrations due to road conditions. Influence of high contact pressures and temperatures follow fretting fatigue between two mating leaf surfaces.
In this project manufacturing of leaf spring is been studied The material used for leaf springs is usually a plain carbon steel having 0.90 to1.0% carbon. The leaves are heat treated after the forming process. Mechanical properties like hardness and load test has been identified