Something about equipment lifting ears?
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Please tell me, in the lifting lug strength calculation example of HG/T 21574-94 equipment lifting lug standard, what is the material of the lifting lug plate?: Q235-A, allowable tensile stress σ] ： 130Mpa, allowable shear stress τ of lifting lug plate] ： 91Mpa, where did you find out these two values? Isn't it calculated?
It is estimated that the tensile strength, yield strength, etc. are divided by a certain safety factor.
But I just don’t know how it came about. If I use 304, what are these two values? I want to design a non-standard one. Now it’s not worth it, so I don’t know how to do it.
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Lifting lugs can be directly selected according to the standard. There is no need to use stainless steel.
It is a simple steel structure mechanics calculation problem. The relationship between the allowable shear stress and the allowable tensile stress of a material can be found in materials mechanics or pressure vessel textbooks!
The correct safety factor for the second floor is determined by the weight of the equipment.