Buckling of Structures

To undertake a laboratory test to determine the buckling load of a long thin structure and
then compare the results with both theory and virtual simulations.
Laboratory Procedure
USE THE BUCKLING RIG
1. Turn on all devices
2. Measure the cross section of the beam at various positions along its length and
determine the average width and thickness.
3. Insert the beam into the clamps at both ends.
4. Measure and record the length between the supports.
5. Note what type of support the clamps used provide (fixed, pinned, free…etc).
6. Position the DTI gauge at the centre of the span and adjust it so it is at approximately
midpoint of its travel.
7. Zero the load and deflection measures.
8. Slowly increase the load applied and record load and deflection in APPROXIMATELY
20N steps up to a maximum of 220N.
9. Observe buckling load and associated buckled shape.
10. You may wish to repeat the procedure using a different length of protrusion or
different style end clamps.
Theory:
The theory for this exercise was derived in class and is also a standard solution in many
statics text books. Use this theory to confirm the test results achieved.
ANSYS
ANSYS can be used to calculate the buckling load of a beam. Use the tutorial you have been
given to analyse each of the test lengths measured in the lab to confirm the results. Be
particularly careful to ensure the end conditions are simulated correctly (or account is made
for any difference). Try the calculation using both solid and beam modelsTo undertake a laboratory test to determine the buckling load of a long thin structure and
then compare the results with both theory and virtual simulations.
Laboratory Procedure
USE THE BUCKLING RIG
1. Turn on all devices
2. Measure the cross section of the beam at various positions along its length and
determine the average width and thickness.
3. Insert the beam into the clamps at both ends.
4. Measure and record the length between the supports.
5. Note what type of support the clamps used provide (fixed, pinned, free…etc).
6. Position the DTI gauge at the centre of the span and adjust it so it is at approximately
midpoint of its travel.
7. Zero the load and deflection measures.
8. Slowly increase the load applied and record load and deflection in APPROXIMATELY
20N steps up to a maximum of 220N.
9. Observe buckling load and associated buckled shape.
10. You may wish to repeat the procedure using a different length of protrusion or
different style end clamps.
Theory:
The theory for this exercise was derived in class and is also a standard solution in many
statics text books. Use this theory to confirm the test results achieved.
ANSYS
ANSYS can be used to calculate the buckling load of a beam. Use the tutorial you have been
given to analyse each of the test lengths measured in the lab to confirm the results. Be
particularly careful to ensure the end conditions are simulated correctly (or account is made
for any difference). Try the calculation using both solid and beam models

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