Fracture Resistance of Advanced High-Strength Steel Sheets for Automotive Applications

Abstract The fracture resistance of different advanced high-strength steel (AHSS) sheets for automotive applications is investigated through conventional tensile tests, toughness measurements, and hole expansion tests. Different fracture-related parameters, such as the true strain (TFS), thickness (TTS), at crack initiation ( w e i ), specific essential work ratio (HER), are assessed. ) shown to be a suitable parameter evaluate local formability AHSS. results reveal that cannot estimated from any parameters derived tests show importance microstructural features on propagation resistance. Based relation toughness-local formability, new AHSS classification mapping accounting global cracking proposed. Furthermore, physically motivated criterion edge-cracking prediction, based measurements in fatigue pre-cracked DENT specimens,