Fracture Resistance of Advanced High-Strength Steel Sheets for Automotive ApplicationsShow others and affiliations
2021 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 52, no 2, p. 840-856Article in journal (Refereed) Published
Abstract [en]
The fracture resistance of different advanced high-strength steel (AHSS) sheets for automotive applications is investigated through conventional tensile tests, fracture toughness measurements, and hole expansion tests. Different fracture-related parameters, such as the true fracture strain (TFS), the true thickness strain (TTS), the fracture toughness at crack initiation (wie), the specific essential work of fracture (we), and the hole expansion ratio (HER), are assessed. The specific essential work of fracture (we) is shown to be a suitable parameter to evaluate the local formability and fracture resistance of AHSS. The results reveal that fracture toughness cannot be estimated from any of the parameters derived from tensile tests and show the importance of microstructural features on crack propagation resistance. Based on the relation fracture toughness-local formability, a new AHSS classification mapping accounting for global formability and cracking resistance is proposed. Furthermore, a physically motivated fracture criterion for edge-cracking prediction, based on thickness strain measurements in fatigue pre-cracked DENT specimens, is proposed.
Place, publisher, year, edition, pages
Springer, 2021. Vol. 52, no 2, p. 840-856
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-82415DOI: 10.1007/s11661-020-06119-yISI: 000604556500002Scopus ID: 2-s2.0-85098718224OAI: oai:DiVA.org:ltu-82415DiVA, id: diva2:1518057
Note
Validerad;2021;Nivå 2;2021-01-28 (johcin);
Finansiär: European Commission (800693 — CrashTough — RFCS-2017)
2021-01-152021-01-152021-10-15Bibliographically approved