Which of the following is the correct statement?
The strength of timber :
-
A.
Is maximum in the direction 45° to the grain
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B.
Is maximum in the direction parallel to the grain
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C.
Remains same in all directions
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D.
Is maximum in the direction perpendicular to the
grain
Correct Answer:
B. Is maximum in the direction parallel to the grain
Explanation:
The correct statement is that the strength of timber is maximum in the direction parallel to the grain. Wood is an orthotropic material, meaning its mechanical properties differ along three mutually perpendicular axes: longitudinal (parallel to the grain), radial, and tangential. The longitudinal direction is the strongest because the long, interlocking cellulose fibers are oriented to resist stress and distribute loads efficiently along the length of the board. In contrast, timber is significantly weaker when loaded perpendicular to the grain (in radial or tangential directions), as forces then tend to separate the lignin binder holding the fibers together rather than pulling against the fibers themselves.
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