Abstract
In the presented paper the local instabilities occurring in compression test of perforated thin-walled bars of low slenderness are observed using digital image correlation system ARAMIS. The tested samples slenderness is so low, that from theoretical point of view we are dealing with compression tests of some perforated shells. The samples are made from typical low carbon steel, which has to be treated as elasto-plastic material. Because of that, the final geometry of the sample (after unloading) is also analysed giving a good data for calibration of the theory of elasto-plasticity for large deformations. In analysed cases the total strain values are not exceptionally large, while local rotation (and permanent deformations) have significant values.
Highlights
The paper deals with analysis of the local plastic instabilities of perforated thin-walled bars [1] of a low slenderness value (λ ranging from 1 to 11) in compression tests
From theoretical point of view, bars of such low slenderness have to be treated as compressed shells
The deformation development are observed using digital image correlation (DIC) system ARAMIS [4,5,6,7] with two cameras registering the movement of points located in observation range through distinct grey level obtained on the basis of random pattern
Summary
The paper deals with analysis of the local plastic instabilities of perforated thin-walled bars [1] of a low slenderness value (λ ranging from 1 to 11) in compression tests. From theoretical point of view, bars of such low slenderness have to be treated as compressed shells. In such case the final configuration shape (after full unloading) depends on elasticity properties. The deformation development (including local instabilities of walls) are observed using digital image correlation (DIC) system ARAMIS [4,5,6,7] with two cameras registering the movement of points located in observation range through distinct grey level (determined for each facet) obtained on the basis of random pattern (black pattern on white background). Thanks to DIC system the deformation components may be registered in some observational range [8,9,10,11,12,13], being full side wall of the bar (for lower slenderness) or a part of the side wall in case of higher slenderness value
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
