Kelley, R. D., & Moyer, B. E., & deVries, R. H. (2016, June), End Fixture Design to Enhance Column Buckling Lesson  Paper presented at 2016 ASEE Annual Conference & Exposition, New Orleans, Louisiana. 10.18260/p.26958

\bibitem{asee_peer_26958}
  Kelley, R. D., \& Moyer, B. E., \& deVries, R. H. (2016, June), \emph{End Fixture Design to Enhance Column Buckling Lesson}
  Paper presented at 2016 ASEE Annual Conference \& Exposition, New Orleans, Louisiana.
  10.18260/p.26958

Randy Dean Kelley P.E., Brian E Moyer, and Roelof Harm deVries P.E..  "End Fixture Design to Enhance Column Buckling Lesson".  2016 ASEE Annual Conference & Exposition, New Orleans, Louisiana, 2016, June.  ASEE Conferences, 2016.  https://peer.asee.org/26958 Internet.  04 May, 2024

\bibitem{asee_peer_26958}
  Randy Dean Kelley P.E., Brian E Moyer, and Roelof Harm deVries P.E..
  "End Fixture Design to Enhance Column Buckling Lesson".
  \emph{2016 ASEE Annual Conference \& Exposition, New Orleans, Louisiana, 2016, June}.
  ASEE Conferences, 2016.
  https://peer.asee.org/26958 Internet.  04 May, 2024

@INPROCEEDINGS{asee_peer_26958
author = "Randy Dean Kelley P.E., Brian E Moyer, and Roelof Harm deVries P.E."
title = "End Fixture Design to Enhance Column Buckling Lesson"
booktitle = "2016 ASEE Annual Conference \& Exposition"
year = "2016"
month = "June"
address = "New Orleans, Louisiana"
publisher = "ASEE Conferences"
note = {https://peer.asee.org/26958}
number = {10.18260/p.26958}
}

TY  - CPAPER
AB  - Column Buckling Lesson

Abstract


	Column buckling is an important topic in teaching strength of materials.  This topic is emphasized with a compression / buckling experiment using a Satec uni-axial testing machine.  Polyvinyl Chloride (PVC) pipe (1/2 inch diameter) was used as the columns.  Ambiguity of end fixity led to difficulty in correlating the resulting load – defection curves to theory.  Several lengths of pipe had been use to give the students a good representation of the transition between straight compression to column buckling.  In the past, the PVC pipes had been placed against the table and the cross piece of the Satec machine to approximate end fixity condition similar to that of a fixed end.  Often, buckling would occur due to an induced moment cause by the load not being applied at the centroid of the pipe and transitions of end fixity from something close to cantilevered to something more closely related to pinned, albeit eccentrically pinned, made interpretation of the results difficult.  This become more pronounced as the PVC pipe length grew longer.  
	To alleviate this problem and to provide a better learning experience, two sets of “cups” were designed to hold the ends of the PVC pipe.  One set (top and bottom) were rotationally fixed and provided support for the pipe ends to simulate a cantilevered end fixity condition.  The second set, were design to hold the pipe end but allowed rotation about one axis, a “pinned” joint. 
	Both sets of “cups” worked very well in practice.  The K constant was calculated by the students in the experiment write up and was very comparable to published values.   Load – deflection plots of the pipe buckling showed results more consistent with theoretical plots.  Rather than limiting students to more idealized experimental conditions, the next portion of the experiment asked the students to extend their understanding of the underlying theory.  By revisiting the original procedure, one with a non-ideal end fixity, the students were expected to compare the two types of end conditions and draw conclusions regarding how the non-ideal case might analyzed.


AU  - Randy Dean Kelley P.E.
AU  - Brian E Moyer
AU  - Roelof Harm deVries P.E.
CY  - New Orleans, Louisiana
DA  - 2016/06/26
PB  - ASEE Conferences
TI  - End Fixture Design to Enhance Column Buckling Lesson
UR  - https://peer.asee.org/26958
DO  - 10.18260/p.26958
ER  -