benperryman
Mechanical
- May 9, 2015
- 2
The title of the project is as follows:
A study of the effect of imperfections on the buckling capability of a soda can under axial loading.
My group and I are aiming to carry out the following:[/li]
[li]Linear buckling analysis of soda can to gain first 5 eigenvalues[/li]
[li]Riks buckling analysis with plasticity and the introduction of imperfections in the form of wall thickness[/li]
[li]Riks buckling analysis with plasticity and the introduction of imperfections in the form of out-of-roundness[/li]
[li]Experimental analysis on an Instron machine to compare with results gained on Abaqus CAE[/li]
The following steps were carried out for he linear buckling analysis:
[li]Create part (Shell, extrusion)[/li]
[li]Apply material properties and section[/li]
[li]Mesh – Sweep[/li]
[li]Sets of up and down slave nodes with master reference points[/li]
[li]Steps – Linear perturbation, Buckle[/li]
[li]Apply constraints, BCs and load[/li]
The same was then carried out for the Riks analysis with the following changes:
[li]Add plasticity values for material using true-stress strain curve[/li]
[li]Steps- Riks, static step[/li]
[li]Load is set for that to be equal to first buckling load (-2554.5 Pa)[/li]
[li]Apply load equal to that of the first buckling load[/li]
[li]Introduce imperfections using edit keywords window[/li]
[li]
[li]
[li]
Using the edit keywords window, I typed in what's shown on the attached image (where Buckle_load are the results from the linear analysis)
We are now stuck on how to compute the imperfection in terms of out of roundness. Any suggestions would be much appreciated!
A study of the effect of imperfections on the buckling capability of a soda can under axial loading.
My group and I are aiming to carry out the following:[/li]
[li]Linear buckling analysis of soda can to gain first 5 eigenvalues[/li]
[li]Riks buckling analysis with plasticity and the introduction of imperfections in the form of wall thickness[/li]
[li]Riks buckling analysis with plasticity and the introduction of imperfections in the form of out-of-roundness[/li]
[li]Experimental analysis on an Instron machine to compare with results gained on Abaqus CAE[/li]
The following steps were carried out for he linear buckling analysis:
[li]Create part (Shell, extrusion)[/li]
[li]Apply material properties and section[/li]
[li]Mesh – Sweep[/li]
[li]Sets of up and down slave nodes with master reference points[/li]
[li]Steps – Linear perturbation, Buckle[/li]
[li]Apply constraints, BCs and load[/li]
The same was then carried out for the Riks analysis with the following changes:
[li]Add plasticity values for material using true-stress strain curve[/li]
[li]Steps- Riks, static step[/li]
[li]Load is set for that to be equal to first buckling load (-2554.5 Pa)[/li]
[li]Apply load equal to that of the first buckling load[/li]
[li]Introduce imperfections using edit keywords window[/li]
[li]
Max deformation from linear buckling analysis normalised (1/1.092E-03)[/li][li]
Multiply by thickness (0.097E-03)[/li][li]
Multiply by 0.1 for 10% imperfection, 0.2 for 20% and so on[/li]Using the edit keywords window, I typed in what's shown on the attached image (where Buckle_load are the results from the linear analysis)
We are now stuck on how to compute the imperfection in terms of out of roundness. Any suggestions would be much appreciated!