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#1 2014-02-26 08:13:22

ninjaman
Member
Registered: 2013-10-15
Posts: 61

elastic modulus

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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