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hello
I have a question im stuck on.
a beam must withstand a bending moment of 285kNm. if the maximum stress must not exceed 200Mpa, determine the elastic modulus z and select an appropriate I section from the given table. (the table is in the book that I have)
im not sure what the math formula im supposed to use.
the elastic modulus is z = I / y
I don't know what I is or Y
I have M, the maximum bending moment Nm
and, sigma which is stress in pa
so I thought M/sigma = z. 285*10^3 * 200 = 1425
im not sure if the M in Mpa is mega(1000 000) or milli or what. when I use mega the answer is really small.
a push in the right direction please
many thanks
simon:)
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