Four Point Bending Test [formules]

9 First of all we will deduce the differential equation for the total deflection Vt=Vb+Vs. Rewriting equations 7 and 8: 10 11 . Di. fferentiations of these equations with respect to x and t give: 12 13 14 . El. imination of the derivations of Vs leads to: 15 . In. tegration of equation 8 over x leads to (including an unknown function H[t]): 16 . El ................
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