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Mechanical properties of a given steel under compression
compare closely with its tensile properties. An upset can be performed
to determine how the steel will perform under compressive load.
A brittle steel under compression will ultimately fail by breaking
along cleavage lines at an angle approximately 30 degrees from the axis
of pressure being applied.
A more ductile steel flattens out, rather than cleaving, showing
vertical cracks around the outer circumference. This ductile steel will
not break, but will continue to flatten as more stress (load or
force) is applied.
This compression or upset test is helpful for assuring that a steel will successfully cold work.
It can also be used to determine the extent of seams, laps or other
surface imperfections on the surface of the bar. That's what I used to
do when we were producing drawn wire for cold heading applications.
Editor's Note: CR4 would like to thank Milo for sharing this blog entry, which you can also read here.
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Re: Upset Testing--Steel in Compression
