- #1

- 8

- 0

so far i have

MOI (I)=3.495 in^4

Section modulus=2.330 in^3

MOE (E)=29,000,000 psi ( i think this is correct but i'm not sure. just want to use low grade steel)

- Thread starter drewjohn
- Start date

- #1

- 8

- 0

so far i have

MOI (I)=3.495 in^4

Section modulus=2.330 in^3

MOE (E)=29,000,000 psi ( i think this is correct but i'm not sure. just want to use low grade steel)

- #2

Mech_Engineer

Science Advisor

Gold Member

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- #3

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- #4

minger

Science Advisor

- 1,495

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Via http://www.engineeringtoolbox.com/beam-stress-deflection-d_1312.html the maximum stress in a simply supported distributed loaded beam is:

[tex]

\sigma = \frac{y q L^2}{8 I}

[/tex]

Where y is the perpendicular distance from the neutral axis, q is the load in force/length, L is the length of the beam, and I is the area moment of inertia of the cross section.

Be careful though, depending on the application. Yield strength is the strength assuming one cycle. If this beam is to be loaded and unloaded, then you should calculate a fatigue life, and then still use a safety factor.

Good luck,

- #5

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but what i want to know it q. right?

would be 1.5?

would be 1.5?

- #6

minger

Science Advisor

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Yes, find an allowable maximum stress and solve for q.

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