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brianrodriguez2005
03.04.2020 •
Engineering
A light pressure vessel is made of 2024-T3 aluminum alloy tubing with suitable end closures. This cylinder has a 3.50 in. OD, a 0.065 in. wall thickness, and ν = 0.340. The purchase order specifies a minimum yield strength of 46 kpsi. Using the distortion-energy theory, determine the factor of safety if the pressure-release valve is set at 500 psi?
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Ответ:
the factor of safety is 3.87
Explanation:
Outside diameter, d₀ = 3.5 in
Thickness, t = 0.065 in
Poission ratio, v = 0.334
Yield strength,
= 46 kpsi = 46000 psi
Pressure release load, d₁ = d₀ - 2t = 3.5 - (2 x 0.065) = 3.37 in
Tangential stress, σ₁ = P(d₁ + t) / 2t
= 500 (3.37 + 0.065) / 2 x 0.065
= 13211.5385 psi
σ₁ = P(d₁) / 4t = 500(3.37) / 4 x 0.065 = 6480.769 psi
Radial stress, σ₀ = -P ==> -500 psi
Principal stresses, σ' =
√[(σ₁ - σ₁)² + (σ₁ - σ₁)² + (σ₁ - σ₁)²]
σ' =
√[(13211.5385 - 6480.769)² + (6480.769 - (-500))² + (-500 - 13211.5385)²]
=11875.1986 psi
Factor of safety Л =
/ σ'
= 46000 / 11875.1986
= 3.8736
Л = 3.87
Ответ:
1.75 or if it’s a fraction 1 3/4
Step-by-step explanation: