TAILIEUCHUNG - New Trends and Developments in Automotive System Engineering Part 5

Tham khảo tài liệu 'new trends and developments in automotive system engineering part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 148 New Trends and Developments in Automotive System Engineering Fig. 1. A After 160 cycles and B after 320 cycles. Note the macroscopic cracks propagating on the friction surface along the radial direction extending from the inner to the outer radius of the disc Maluf 2007 . is clear that cracking in brake discs should be seen as an isothermal and thermomechanical problem. Isothermal Fatigue IF consists in the application of a variable mechanical strain at a constant temperature. The main advantages of this test are its simplicity and lower cost than that of anisothermal tests thermomechanical . Until recently the fatigue strength of materials at high temperatures was estimated based on IF tests at the maximum temperature expected in the Thermal Fatigue TF cycle. However this procedure proved to be insufficient because the strength of materials in TMF is significantly lower than that expected for the IF-based estimate. This is due to mechanisms possibly activated during the thermal cycling of TMF which does not occur in IF where the temperature is kept constant. There are two main types of brake systems drum and disc. The use of disc in place of drum brakes in heavy vehicles has become increasingly common in recent years. This is due mainly to the search for greater braking efficiency since disc brakes withstand higher temperatures than drum brakes BOIOCCHI 1999 . However simply changing the drum shoe for the disc pad system does not suffice making it necessary to analyze the brake system as a whole as well as its influence on the vehicle s performance and safety. In many high responsibility applications - as in the case of brake discs knowing the results of tensile impact and hardness testing is not enough to characterize the materials used in components because these results cannot provide the information needed to reliably predict the behavior of these parts in real working conditions. Ideally the materials used in brake systems should possess several .

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