Static and Vibration Analysis of CFRP Composite Mono Leaf Spring
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FEATURE
Static and Vibration Analysis of CFRP Composite Mono Leaf Spring Ehab Samir Mohamed Mohamed Soliman
Submitted: 5 November 2018 / in revised form: 4 January 2019 / Published online: 25 January 2019 ASM International 2019
Abstract Conventional steel leaf spring is analyzed at maximum load using finite element analysis (FEA), ANSYS v16 software. The finite element results showed stresses and deflection, and then by using the results of the steel leaf spring, a composite one made from carbon fiber with epoxy resin CFRP is designed using FEA. The objective was to obtain safe design of CFRP composite leaf spring with less weight and the same stiffness of that the steel one. In the study, safe design means that CFRP composite leaf spring has high safety factor in stresses and high natural frequencies. Static, modal and harmonic analysis for both steel and composite leaf springs has been carried out using FEA. The results showed that the CFRP composite leaf spring withstands against failure and resonance where it has much higher factor of safety in stresses and higher natural frequencies with weight reduction 79% over conventional steel leaf spring. Keywords Leaf spring Finite element analysis (FEA) CFRP Modal analysis
Introduction The composite materials have been used on a large scale in automobile industry because of its higher strength-toweight ratio [1]. The leaf springs absorb and store strain energy and then release it [2]. Using composite materials leads to high strain energy. Hence, the composite materials are considered very appropriate best materials in design E. S. M. M. Soliman (&) Mechatronics and Robotics Department, Faculty of Engineering, Egyptian Russian University, Badr City, Cairo 11829, Egypt e-mail: [email protected]
leaf springs. For the same stiffness of the conventional steel leaf spring, it is possible to reduce its weight by using composite materials in its design. Quershi [2] designed single leaf spring with variable thickness of glass fiber-reinforced plastic (GFRP) with similar mechanical and geometrical properties to the multileaf steel spring. He developed an expression which is a function of thickness and position along the spring. His study showed that composite can be used for leaf spring for light trucks to meet the requirement and reduce the weight. Hou et al. [3] described three designs of eye-end attachment for glass fiber-reinforced polyester composite leaf springs. They carried out finite element analysis, static and fatigue testing to obtain the characteristics of the spring. They selected the open eye design as the final design where it survived the static proof loading and very good fatigue resistance. Goudah et al. [4] were developed finite element models to optimize the material and geometry of the composite elliptical spring based on the spring rate, log life and shear stress. They investigated both experimentally and numerically the influence of ellipticity ratio on performance of woven roving wrapped composite elliptical springs. Their study demonstrated
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