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Aluminum steering knuckles are widely employed for weight reduction and improvement of ride & handling performance. In this study, a high strength aluminum alloy for cast-forged knuckle was designed to achieve higher mechanical properties than those of the conventional foundry alloy. Using this alloy, high strength knuckles were manufactured and performed test of mechanical properties, suspension module strength and durability. The strength and the elongation of the developed knuckle were increased by 20% and 40%, respectively, as compared with the conventional alloy. Also this knuckle passed the static strength and durability test of the front suspension module.

This paper introduces an Arrhenius modeling approach for predicting lifetime of PS (Power Steering) rubber hose, one of important parts for steering system. PS hose would affect the durability and quality of automobile. First the temperature of power steering system is measured in order to investigate the driving environment of an automobile during driving. Moreover, the change of the mechanical properties extracted from power steering hose of automobile in traveling is measured so as to estimate lifetime. As the data obtained through the accelerated test, the lifetime prediction of rubber hose is performed with Arrhenius model. The lifetime is regarded when the uniform variation of initial characteristic value for a rubber hose at varied temperatures is happen and is predicted through the correlation work between the master curve of Time-temperature (T-t) and relational formula performed by material and impulse test.

A new heat-resistant cast iron alloy has been developed for the exhaust manifolds of new passenger-car diesel engines. This development occurred because operating demands on exhaust manifolds have increased significantly over the past decade. These demands are due to higher exhaust gas temperatures resulting from tighter emission requirements, improved fuel efficiencies, and designs for higher specific engine power. These factors have led to much higher elevated temperature strength and oxidation resistance requirements on exhaust manifold alloys. Additionally, thermal fatigue that occurs directly as a result of thermal expansions and mechanical constraint has become an increasingly important issue. The research detailed in this paper focused on the optimization of the chemical composition of a Si-Mo ductile iron to improve the mechanical and physical properties for use in an engine exhaust manifold.