Fatigue Damage Analysis Of The Independent Suspension Assembly

The fatigue life is a very important indicator of the automotive product development, China’s auto market is increasingly expanding and increasingly fierce competition in the market, users have higher expectations for the life of automotive products, traditional static strength, unable to meet the product car users, the actual road parts durability, fatigue life prediction through the analysis of parts of the actual use of the environment, the use of finite element theory and modern fatigue theory to ensure that in product design to predict the fatigue life, which improve the reliability of the product.The McPherson suspension in the car independent suspension, front suspension is widely used in cars, play a role in the vehicle was, its performance will directly affect the ride comfort, safety and comfort of the car. Under the arm, knuckle, subframe and stabilizer bar and other parts are the main components in the McPherson independent suspension assemblies, is also prone to fatigue in parts by the alternating load, so the research analysis of the independent suspension into the main components of the fatigue life and provide data to support the development of design and high reliability automotive independent suspension is an important part of the design of automotive product development. China’s suspension of fatigue durability of design experience to design and analog design stage, unable to meet the control requirements of the modern design of high performance automotive products and R&D costs. Lead to suspension component fatigue life design in new product development, the lack of scientific basis for the fatigue reliability of the parts is generally low, a very large adverse effects to enhance the quality of automotive products. China’s own brand cars and foreign automotive products, one of the biggest gaps is the durability of the product. Therefore, the design and analysis of automotive suspension parts, you need to probability theory and statistics-based, with the finite element theory and method to predict the fatigue durability of automotive products to improve the reliability of auto parts is very significance.Of the main components of the suspension assembly is knuckle, under the arm, stabilizer bar, and subframe static strength results in a number of typical operating conditions, the use of finite element theory, fatigue the fracture theory, with three-dimensional CAD software and CAE finite element software, using the method of fatigue life prediction and reliability, the key parts of the suspension assembly modal, static strength, fatigue damage analysis and forecasting.