Effect of material properties of advanced high strength steels on bending crash performance of hat-shaped structure

Evaluation of hydrogen absorption into steel in automobile moving environments

“…Recently, high-strength steel sheets over the tensile stress of 1200 MPa have been developed and applied to automobile bodies [1,2], aiming at reduction in the weight of automobile bodies and further improvement for crashworthiness [3,4]. However, to utilize the high-strength steel sheets to automobile bodies, it should be investigated whether the steels are susceptible to hydrogen embrittlement in automobile moving environments [5][6][7][8][9].…”

Dynamic necking in materials with strain induced martensitic transformation

“…Moreover, it is commonly accepted that metallic materials for crash, impact or blast protection have to show a high strain hardening, whatever the range of strain rates. Among the metallic materials having these specific features, steel grades showing Strain Induced Martensitic Transformation (SIMT) are widely used for energy absorption in crash or blast protection applications (Andersson, 2005;Schleyer, 2005, 2006;Bleck et al, 2005;Sato et al, 2013). Their ability to transform from the initial face-centered cubic austenite phase γ to body-centered cubic martensite α′ during plastic deformation is comparable to a dynamic composite effect and causes a remarkable hardening (Lichtenfeld et al, 2006;Oliver et al, 2007;Dan et al, 2008).…”

Application of Multivariate Adaptive Regression Splines to Sheet Metal Bending Process for Springback Compensation

“…Representation of the basis function is given in equation (4). The generalized expression of the method using the mentioned basis function is given in equation (5).…”