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.
Mechanical Engineering
Machine Design
Difficulty: Easy
Choose an option
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Ad = t
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Bd = 1.6 t
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Cd = 2 t
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Dd = 6 t
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Ed = 6 √t
Answer
Correct Answer: d = 6 √t
Explanation
ConceptUnwin'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 incorrectOptions (a)–(d) are linear in t and do not match the established square-root relation used in design charts and handbooks.
Final Answerd = 6 √t