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A wood specimen having a square cross section of 2 in. × 2 in. (actual dimensions) was tested in bending by applying a load at the middle of the span, where the span between the simple supports was 28 in. The deflection under the load was measured at different load levels as shown in Table P10.23.
a. Using a computer spreadsheet program plot the load–deflection relationship.
b. Plot the proportional limit on the graph.
c. Calculate the modulus of rupture (flexure strength).
d. Does the modulus of rupture computed in (c) truly represent the extreme fiber stresses in the specimen? Comment on the assumptions used to compute the modulus of rupture and the actual response of the wood specimen.