Railways6 min read
The shape of a quiet railway wheel
A wheel's web moves its vibration modes, but roughness at the wheel-rail contact and the demands of strength and weight decide whether a quieter shape works in service.
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Railways6 min read
Why a train wheel has a different shape from a car wheel
A railway wheel does more than roll. Its tread meets the rail at changing radii, while its flange waits beside the rail; together with the fixed axle, those shapes help a train follow curves and stay stable on straight track.
Repair5 min read
Why an adhesive joint fails at the edge
A broad glued overlap can concentrate force near its ends. Shear, bending and peel can start a crack in the adhesive or the material beside it; experiments show why total bond area alone is a poor strength test.