D.Minnich
Cast Iron
- Joined
- Mar 30, 2021
- Location
- Cleveland area
When calculating tonnage in a tool (e.g. Progressive die) you have to calculate for shearing, stripper force, & forming. The formula to calculate the shearing (Cutting) is PARIMITER(in.) x MATERIAL THICKNESS (in.) x SHEAR STRENGTH (Tons).
But There are no published standard values for shear strength like there are with tensile and yield strengths. Therefor, as I understand it, the data is estimated as a percentage of the ultimate tensile strength of the material.
My question is, what is this percentage? The only reason I am asking is because I have seen it in books and magazine articles and web sites anywhere from 55% to 85% It is all over the board depending on who you ask...So is there a standard for the actual percentage somewhere other than opinions?
But There are no published standard values for shear strength like there are with tensile and yield strengths. Therefor, as I understand it, the data is estimated as a percentage of the ultimate tensile strength of the material.
My question is, what is this percentage? The only reason I am asking is because I have seen it in books and magazine articles and web sites anywhere from 55% to 85% It is all over the board depending on who you ask...So is there a standard for the actual percentage somewhere other than opinions?