Load Limiting Shear Plate Material
Load Limiting Shear Plate Material
(OP)
Hello All. I'm working on a project where I need a shear plate (think fusable link). Basically once a certain load is reached the "shear" disc fractures and the load is released. The disc will be grooved to set the load at which it fractures, but with the materials i'm used to the thickness is crazy small (.005 in"!) I'm looking for a material that's got about a 30 ksi or less shear strength, somewhat brittle (~Like 4140 is brittle, would like it to just shear cleanly), is machinable, somewhat corrosion resistant.
Any advice would be appreciated, I could go through all the books, or I can ask those who know...
-Mike
Any advice would be appreciated, I could go through all the books, or I can ask those who know...
-Mike





RE: Load Limiting Shear Plate Material
The biggest criteria for good repeatable shear is to use material with low work hardening. If you need corrosion resistance look at the ferritic or maternsitic stainless grades.
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RE: Load Limiting Shear Plate Material
We'd also like the shear to be such that there's a low percentage of penetration prior to shear. Is that related to low work hardening?
RE: Load Limiting Shear Plate Material
I always presumed that strain hardening was why some materials made it difficult to reproduce shear loads. They would be sensitive to strain rate.
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Rust never sleeps
Neither should your protection
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RE: Load Limiting Shear Plate Material
RE: Load Limiting Shear Plate Material
You also want to make sure that the parts that cut the plate are ~10pts greater HRc so that they dont wear each time the plate shears... unless they can be replaced each time also.
RE: Load Limiting Shear Plate Material
You need to have a groove or score line at the shear location. You know, like the thin lines stamped into blow out discs.
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Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Load Limiting Shear Plate Material
To calibrate when it shears, I was going to change the length of the material being sheared (it doesn't need to be a complete ring)