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3 cards from this section. Quick, good the night before a test.
Define radial longitudinal strain (ϵ_rr).
Think about how the radial lines in a cylinder change during inflation.
What does hoop strain (ϵ_θθ) measure?
Consider the circular direction around the cylinder.
What does ϵ_rr represent in a cylindrical object?
Focus on the radial aspect of deformation.
True or False: Hoop strain (ϵ_θθ) can exist even when no radial displacement occurs.
Think about pressure systems.
A cylindrical concrete column is subjected to an axial force along its length and a lateral pressure from the environment. Calculate the radial and hoop strains, assuming the column radius increases with deformation.
Remember Poisson’s ratio can link radial and hoop strains.
Design a thin-walled pressure vessel and present the critical factors affecting the strain in both radial and circumferential directions as internal pressure increases.
Look into classical thin-walled approximations for your approach.
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