Finite element analysis of stretch bending for advanced high strength steels (AHSS)-Edición Única

Eight years ago, no vehicle produced in North America contained Advanced High Strength Steels (AHSS) but today almost every new vehicle coming on the market has applications of AHSS. AHSS enable the use of thinner components, which yields better vehicle performance and higher fuel efficiency. Stretch Bending Test (SBT) has been commonly used because it emulates bending and stretching conditions that are common in stamping processes. SBT can also be used to evaluate and rank material formability. The proposed methodology of this study is used to predict failure in stretch bending of AHSS using Finite Element Analysis (FEA). Different criteria are used in order to predict fracture in stretch bending of AHSS and one important factor is studied: punch radius vs. sheet thickness ratio (R/t). The proposed methodology is based on the works developed by [Sriram, 2003] and [Uko, 1977].