| About this Abstract |
| Meeting |
13th International Conference on the Technology of Plasticity (ICTP 2021)
|
| Symposium
|
13th International Conference on the Technology of Plasticity (ICTP 2021)
|
| Presentation Title |
New Methods for Fracture Detection of Automotive Alloys
in the VDA238-100 V-Bend Bend Test
|
| Author(s) |
Jacqueline Noder, Cliff Butcher |
| On-Site Speaker (Planned) |
Jacqueline Noder |
| Abstract Scope |
The VDA 238-100 tight-radius bend test has received significant attention from industry because it provides a proportional plane-strain-plane-stress state until fracture. A custom inverted V-Bend test frame has been developed to facilitate DIC strain measurement on the convex surface where fracture initiates. It will be demonstrated that the adoption of the vertical punch force as the unique metric for failure detection is fundamentally flawed. The force will reduce at large bend angles due to the mechanics of the test even in the absence of material failure. Three alternative methodologies for fracture detection are proposed based upon: the bending moment, nominal principal stress, and the strain rate for a range of representative automotive steels Finally, the VDA requirement to pre-strain high ductility materials that can form a complete fold without fracture is critically evaluated and shown to incorporate a non-linear strain path that affects the material response of each alloy differently. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |