Introduction of a 1000 MPa crush tip within a Usibor? 1500-AS axial crush rail using in-die heated hot stamping

International Deep Drawing Research Group 37th Annual Conference

Tummers, M.^1 ; Omer, K.^1 ; Abedini, A.^1 ; Peister, C.^1 ; Butcher, C.^1 ; Worswick, M.J.^1 ; Malcolm, S.^2 ; Yau, C.^3 ; Soldaat, R.^4

University of Waterloo, 200 University Avenue West, Waterloo

ON

N2L 3G1, Canada^1

Honda RandD Americas Inc., 21001 State route 739, Raymond

OH

43067-9705, United States^2

Promatek Research Center Cosma International, 2550 Steeles Ave. E., Brampton

ON

L6T 5R3, Canada^3

ArcelorMittal Dofasco, 1330 Burlington St. E., Hamilton

ON

L8N 3J5, Canada^4

关键词: Axial crushes;    Crash performance;    Crush response;    Different planes;    Fracture locus;    Front-end structures;    Numerical parametric studies;    Tailored properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/418/1/012126/pdf
DOI  :  10.1088/1757-899X/418/1/012126

来源: IOP

【 摘 要 】

Axial crush is an important mechanism used in automotive front end structures to absorb impact energy. In this work, numerical simulation is used to investigate the crush response of a Usibor® 1500-AS axial crush rail with tailored properties achieved using in-die heated (IDH) hot stamping. In this case, the targeted properties in the softened zone correspond to a tensile strength of 1000 MPa. A finite element model is utilized to predict the crash performance of the tailored in-die heated 1000 MPa crush tip within a Usibor® 1500-AS rail. A numerical parametric study is presented, comparing the crush response based on fracture loci determined using two different plane-strain strain experiments, one the plane-strain Nakazima dome test and the other the VDA-238 V-bending test. In addition a number of different mesh regularization treatments are considered. The predictions exhibit a strong dependency of the onset of fracture upon the plane strain fracture strain level and degree of mesh regularization.