Table of contentsI. Life cycle of natural fibersII. Design Parameters of Steel Leaf SpringIII. Selection of composite materialsIn the automotive field, the current situation is to exchange the current material used in vehicles for advanced biological material. To make it environmentally friendly and improve its energy consumption, weight reduction plays a major role. For heavy vehicle suspension, a leaf spring is used when it is upgraded at regular intervals to reduce its weight. The main advantage of leaf spring is that the end of the spring is moved along a particular path to absorb shock and also acts as a supporting member of the structure. This is the major sign of using leaf spring versus coil spring which carries axial loads, lateral loads and braking torque throughout the suspension. Suspension is widely used for the purpose of storing energy and then releasing it. For the design factor, the strain energy is important to design it. So the relationship between strain energy is given bySay no to plagiarism. Get a tailor-made essay on “Why violent video games should not be banned”?Get the original essayU= σ 2/ ρ E….1Hereσ -force,ρ -densityE -Young's modulus of spring materialNowadays, The composite material is used for different application for weight reduction, where leaf spring is also the main one. But it presents itself without reduction in load capacity and suspension stiffness. It must have the ability to store potential energy in the form of strain energy and release it slowly, which helps absorb vertical loads and road impact causing vibration during spring deflection. For the leaf spring, it is suggested that fiber reinforced plastics (FRP), which have high strength and elastic properties in the longitudinal direction, also have a lower weight factor. Due to these qualities, FRP is being replaced by steel and multi-leaf springs. To predict the fatigue life of the material, the theoretical formula used is formulated by the fatigue modulus and its degradation rate is explained by the creation of stress rupture. Nowadays, the main concern is the ecological factor, recyclability and environmental products that make our society free from pollution and global warming problems. . The attractive factors of natural fibers are lower density, high specific mechanical properties, CO2 neutrality, etc. Life cycle of natural fibersAs an alternative to glass fiber among natural fibers, linen fiber has promising good mechanical properties. Here the linen fibers are made up of micro fibrils which give strength. To achieve the best effect of mechanical properties, flax fibers are reinforced into composite materials. It also gains in durability. By increasing the cellulose content of the flax fiber, higher mechanical strength is obtained. Cellulose and lignin represent 71% and 2.2% of flax fibers, respectively. Chemical constituents like high cellulose content also provide and decrease flax's resistance to moisture. In the present work, conventional single and multi-steel leaf springs are analyzed. The results obtained from the analysis are compared with the leaf spring model made of biocomposite material. These springs are designed using CAD software and simulated. The results are analyzed only on the.