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i am an undergrad student

i had an eqn like the following from which i am to find deflection,stress and strain using finite difference method

EI (d^{4}y/dx^{4})-m(d^{2}y/dt^{2})-P sin wt=0

P=force

y=deflection

w=frequency

t=time

i have developed a matlab prog for deflection

how can I find stress and strain now????

i am confused which formula should i use????

should i find moment first and then stress or is there any other way???

just tell me the way, not the prog

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# One dimensional stress,strain,deflection analysis

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