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.
I’m actually trying to get a degree in manufacturing engineering. I liked this post, and I just wanted to comment real quick because it really helped me understand upset testing better. I can see how this would be beneficial in determining the extent of seams, laps or other surface imperfections on the surface of the bar. Thanks for posting.
You’re welcome Kyler. Study hard, our industry can use your talent and fresh ideas.