Behaviour laws comparison for titanium alloys machining: Application to Ti5553
Résumé
The aircraft industry uses materials more and more efficient. This trend affects the majority of parts such as structure parts. Titanium alloy (Ti-5AL-5Mo-5V-3CR) is now used for the production of landing gear. There are many goals in this paper. First, the physical and mechanical properties of the material will be presented. Secondly, we show the relationship between material properties and machinability. Third, the Ti5553 will be compared to Ti64. The Ti64 is a+b alloy group and Ti5553 is a metastable beta but we have chosen to compare these two materials. Ti64 is the most popular of titanium alloys and many of works were been made on its machining. After, we have cited the Ti5553 properties and detailed the behaviour laws. They are used in different ways, with or without thermal softening effect or without dynamic terms. We have to define the best model to use in cutting force model. Differents models are compared for two materials (steel and titanium alloy). To define the model, two methods exist that we have compared. The first is based on machining test however the second on Hopkinson bar test. These methods allow us to obtain different ranges of strain rate, strain and temperature. This comparison will show the importance of a good range of strain rate, strain and temperature for behaviour law, especially in titanium machining.
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