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Question: a thinwalled aluminum alloy spherical shell is expanded by exercise...

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A thin-walled aluminum alloy spherical shell is expanded by exercise internal pressure. If the initial diameter of the shell is D0 = 200 mm which is η maximum diameter that can be achieved without risk of failure? The following diagram can also be used for the answer.

140 Plane strain 120 Equal (balanced) biaxial 100F s 80 carbon steel Failure Brass 60Pure shear zone High-strength 40 7steel imple tension Aluminum alloy (For R 20 safe zone 60 40 20 02040 60 80 Minor strain (96)

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