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Kwame Nkrumah University of Science and Technology, Kumasi

This experiment aimed to determine the maximum load at which struts with different end conditions buckle under compression. The experiment involved compressing struts of varying lengths clamped with either pinned-fixed or fixed-fixed end conditions using an Euler's buckling apparatus. The buckling loads were recorded and compared to calculated Euler buckling loads using the strut properties and formulas provided. Precautions were taken to carefully load the struts and avoid permanent damage. In total, five struts were tested with different end conditions and lengths to observe the effects on buckling load.

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Adasi Samuel
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121 views4 pages

Kwame Nkrumah University of Science and Technology, Kumasi

This experiment aimed to determine the maximum load at which struts with different end conditions buckle under compression. The experiment involved compressing struts of varying lengths clamped with either pinned-fixed or fixed-fixed end conditions using an Euler's buckling apparatus. The buckling loads were recorded and compared to calculated Euler buckling loads using the strut properties and formulas provided. Precautions were taken to carefully load the struts and avoid permanent damage. In total, five struts were tested with different end conditions and lengths to observe the effects on buckling load.

Uploaded by

Adasi Samuel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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KWAME NKRUMAH UNIVERSITY OF SCIENCE AND

TECHNOLOGY, KUMASI.

COLLEGE OF ENGINEERING

DEPARTMENT OF MECHANICAL ENGINEERING.

EXPERIMENT: THE EFFECTS OF END CONDITIONS ON


BUCKLING LOAD

DATE; 29:03:2019

LECTURER;
DR. Y. FIAGBE
Group H

Names Index no.

1. Okoh- Appiah Jeffery 5980016

2. Adasi Samuel 5966316

3. Benson Leslie Nana Yahans 5971716

4. Mahmoud Mahama Dimmie 5977516

5. Yeboah Frederick 5983716

6. Appiah Kubi Emmanuel 5969916

7. Sai Daniel Nii Annan 5981716

8. Agyei-Marfo Benjamin 5967916

9. Danso Enoch Nanor 5973816

10. Danso Aboagye Kwasi 5973916

11. Hodonu Prince Selorm 5975416


OBJECTIVE:

To determine the maximum load at which a strut under compression will


buckle at certain end conditions.

EQUIPMENTS:

Struts with different lengths


Euler’s Buckling apparatus

DESCRIPTION OF EXPERIMENT:

Compressive members can be seen in man structures. They can form part of a framework for instance in a
roof truss, or they can stand-alone; a water tower support is an example of such ,unlike tension member
which will generally only fail if the ultimate tensile tress is exceeded, a compressive member can fail in
two ways. The first is via rapture due to direct stress, and the second is by an elastic mode of failure
called buckling. Generally, short wide compressive members that tend to fail by the material crushing are
called columns. Long thin compressive members that tend to fail by buckling are called struts. When
buckling occurs the strut will no longer carry any more load it will continue to displace i.e. its stiffness
then becomes zero and it is useless as a structural member.

PROCEDURE:

1. Remove the bottom chuck from the machine and clamped the specimen using the cap head
screw and plate to make a pinned-fixed end condition.
2. For fixed-fixed end conditions, fit the top chuck with the two cap head screws and clamped both ends
of the specimen.
Select the shortest strut, number 1, and measured the cross section using a Vernier caliper and calculate
the second moment of inertia I, for the strut.
3. Adjust the position of the sliding crosshead to accept the strut and used thumbnuts to lock off the
slider. Ensured that there is a maximum amount of travel available on the hand wheel thread to compress
the strut and then finally tighten the locking screws.
4. Carefully back off the hand wheel so that the strut is resting in the notch but not transmitting
any load; Re-zero the force meter using the front panel control.
5. Carefully start to load the strut: If the strut buckled to the left, flick the strut to the right and vice versa.
This reduces any errors associated with the straightness of the strut.
6. Turn the hand wheel until there is no further increase in load. Record the final load in the table under
‘buckling’ load.
7. We repeat the procedure with strut numbered 2, 3, 4 and 5 adjusting the crosshead as required to fit the
strut.
8. Load each strut several times until a consistent result was achieved.
Euler’s buckling load for a pinned strut was calculated using the formula;
Pe=π²EI/ L²

Where

Pe= Euler’s buckling load (N)


E = Young’s modulus (Nm ̵ ˡ)
I = Second moment of inertia (m⁴)
L = length of strut (m)

PRECAUTIONS:

1. Experimental setup should not be disturbed.


2. Loading of the shorter strut must be done carefully as the difference needed to obtain buckling
load and the load needed to obtain plastic deformation is quite small.
3. We offloaded the struts immediately after buckling to avoid damaging the strut
permanently.

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