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Riveted joints: Unwin's formula for rivet diameter vs. plate thickness Let t (mm) be the plate thickness. According to Unwin's empirical relation, select the correct expression for rivet hole diameter d (mm). Choose the correct option.

Difficulty: Easy

d = t
d = 1.6 t
d = 2 t
d = 6 t
d = 6 √t

Correct Answer: d = 6 √t

Explanation:

Concept
Unwin's empirical relation (metric) gives rivet diameter as a function of plate thickness t (mm):
d = 6 √t (mm)for common boiler/structural riveting practice (with variants like d ≈ 1.2√t in inches).

Why others are incorrect
Options (a)–(d) are linear in t and do not match the established square-root relation used in design charts and handbooks.

Final Answer
d = 6 √t

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