Abstract The use of Advanced High Strength Steel (AHSS) allows for lightweighting sheet steel components, with maintained structural integrity the part. However, AHSS grades show limitations in edge crack resistance, primarily influenced by sheared damage introduced shear cutting process. Numerical modelling process can aid understanding damage, thus avoiding unforeseen cracking subsequent cold...

We generalize the accelerated Hermitian and skew-Hermitian splitting (AHSS) iteration methods for large sparse saddle-point problems. These methods involve four iteration parameters whose special choices can recover the preconditioned HSS and accelerated HSS iteration methods. Also a new efficient case is introduced and we theoretically prove that this new method converges to the unique solutio...

Hydrogen embrittlement (HE) is one of the most dangerous yet elusive problems in metallic materials. Advanced high-strength steels (AHSS) are particularly prone to HE, as evidenced by serious degradation their load-bearing capacity with presence typically only a few parts-per-million H. This strongly impedes further development and application could set an abrupt halt for weight reduction strat...

Advanced high strength steels (AHSS) exhibit an increased susceptibility to Zn-assisted liquid metal embrittlement (LME). The of AHSS is believed be one important factor controlling LME sensitivity; this study investigated the behavior two having different chemical compositions, while maintaining similar tensile at elevated temperatures. Hot tension tests were performed using simulated spot-wel...

This work presents the effects of strain rate on the tensile properties and fracture morphologies of AHSS-DP 350/600 subjected to LSP. Fatigue crack growth test was performed to evaluate fatigue behavior in the metallic plate of AHSS-DP350/600. However, this material is used in automobile industry and enhancing it fatigue resistance is a challenge in material engineering. In order to evaluate a...

Abstract Advanced high-strength steels (AHSS) have shown profound progress in improving tensile ductility or global formality the last decades over three generations. For a complete assessment of both and local formability, this study aims to characterize compare edge fracture behavior first third-generation AHSS (dual-phase steel quenching & partitioning steel) with same nominal strength l...

The automotive industry has increased significantly the use of advanced high strength steels (AHSS) in many structural components, with the aim to reduce weight and also to increase safety. The high resistance of these steels is accompanied by a decrease in formability, which makes simulation a requirement to adequately foresee the formability of a particular stretch formed component. This work...

In the present work, the edge stretchability of advanced high strength steel (AHSS) was investigated experimentally and numerically using both a hole expansion test and a tensile specimen with a central hole. The experimental fracture strains obtained using the hole expansion and hole tension test in both reamed and sheared edge conditions were in very good agreement, suggesting the tests are e...

The essential work of fracture methodology (EWF) has been successfully adopted to evaluate the toughness various metals and polymers. However, some aspects are still far less understood, such as influence experimental parameters on EWF measurement in thin metal sheets. In present paper, ligament range criterion approach was revised for several advanced high-strength steels (AHSS). validity uppe...

Advanced High Strength Steels (AHSS) provide a good combination of both strength and formability and are therefore applied extensively in the automotive industry, especially in the crash relevant parts of the vehicle. Dual-phase (DP) steel is an example for such AHSS which is widely employed. The excellent macroscopic behavior of this steel is a result of the inherent micro-heterogeneity and co...