Quotulatiousness

March 11, 2024

Why Railroads Don’t Need Expansion Joints

Filed under: Railways — Tags: — Nicholas @ 02:00

Practical Engineering
Published Dec 5, 2023

A friendly overview of thermal effects on railways.

Errata: At 9:00, the left column of calculations is incorrectly labeled “SI.” It should be imperial. Whoops!

Just as all materials have a mostly linear relationship between temperature change and length change, all materials also have a similar relationship between stress and change in length (often called strain). And this is part of the secret to continuous welded rail: restrained thermal expansion. You can overcome one with the other.

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