Numerical Fracture Analysis Considering Forming and Element Size Effect for Automotive Seat Structures

Paper #:
  • 2017-01-0319

Published:
  • 2017-03-28
Abstract:
The aim of this paper is to apply an advanced fracture model and to evaluate its applicability in an automotive seat structure. A Generalized Incremental Stress-State dependent damage Model (GISSMO), which was one of the advanced fracture models implemented in LS-DYNA, was adopted as a fracture model. A description of the damage parameter identification process with material tests was introduced in this study. Generally, fracture strains are known to be dependent on the stress triaxiality, third deviatoric stress invariant (or Lode parameter), element size, temperature, and rate effect. The GISSMO adopts most of these factors, and was introduced and reported in previous works. In order to evaluate the fracture strain in various stress states, uniaxial tension, simple shear-tension, notched-tension, and biaxial tension tests were carried out. The GISSMO damage parameters were calculated and identified using reverse analysis and theoretical equations with some numerical fitting techniques. Because the seat frame consists of thin metal sheets, a shell element type was considered. The results were compared with material test results, and it was evaluated that the values might be applicable to the seat frame model. In addition, it was found that the effects of element size and manufacturing (or forming) are large with regard to fracture behavior. In particular, the seat rail has a residual stress owing to the bending process in the forming step. From these simulation results, the material parameters were applied to the full seat structure. Various models showed good agreement with the experimental fracture strength and crack propagation.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$22.00
Mail
$22.00
Members save up to 36% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
1991-02-01
Training / Education
2016-03-07
Technical Paper / Journal Article
1990-10-01
Article
2016-02-02
Training / Education
2017-04-06
Article
2016-02-02
Article
2016-02-02