CONTACTLESS ANS FuLLFIELD 3D-DEFORMATION MEASUREMENT FOR IMPACT AND CRASH TESTS

摘要

In this paper, we have provided an overview of an accurate technology to measure non-contact and full-field displacement, deformations and strains. The simple and robust setup is well-suited to both laboratory and field conditions and minimal specimen preparation is required. In combination with high speed cameras this technology can be easily used for highly dynamic impact and crash tests. The key points of the technology and analysis software are: 1. Curved or planar objects from 5mm to several meter in size 2. Accuracy unaffected by large in-plane rotations or translations 3. Includes effects of perspective in image analysis 4. Cameras can be calibrated and moved to test site 5. Accuracy up to +/-0.01 pixels in displacement (e.g. 0.01mm at 1000mm measurement field with mega pixel camera) 6. Accuracy > 200 microstrain 7. Strain levels in excess of 100% have been successfully measured 8. Complex loading (combined tension/torsion, compression, pressurization etc.) 9. Quasi-static to ultra-high speed events.