Methodology for determining drawability of high strength materials to vehicles construction

The work presents the results of a study on drawability evaluation methodology of thin sheet metals of high strength. Materials of high strength are used for the construction of car and aircraft components. Those components are responsible for the safety of the construction of vehicles and thus for the safety of passengers. The high strength of the thin metal sheets creates limitations in their deformability. Due to the limited deformability, development of the drawability evaluation methodology is particularly desirable by designers and manufacturers. Automotive industries have many manufacturing problems with so-called advanced high-strength steels (AHSS), while the aerospace industries - with heat resistant and creep resistant alloys, and e.g. nickel superalloys. In these cases, the standard procedure for the qualification of stamping materials has been found to be insufficient. Due to this both industrial problems have been undertaken research on drawability evaluation of selected high-strength thin sheet metals made of DP steel (AHSS representative) and Inconel 625 (nickel superalloy representative). These studies allowed formulating guidelines to methodology of drawablity evaluation of high-strength thin sheet metals. The drawability of these sheet metals has been comprehensively defined by forming limit curves designation, while modern AutoGridreg; digital local strain analyzer and the method of image analysis of deformed coordination nets has been applied. Hereby quantitative and qualitative drawability have been evaluated. The results of the project N R15 0042 06 under the title: "Development of methods for computer-aided design process of stamping products for the aerospace industry", carried out in 2009-2013, gave rise these guidelines.