At the junction of the metal supports of the pressure tank, a crack has been observed that grows due to the earthquake. How is the fatigue life of the structure confirmed against the lateral force of subsequent earthquakes? If there is an article about the fatigue of pressure vessels, please send it.
Dear friend Navid Asadpour
To calculate the fatigue life of a pressure vessel, you can use the Paris equation, which relates the rate of crack growth to the stress intensity factor (K) and the crack growth rate constant (C):
da/dN = C*(ΔK)^m
where da/dN is the crack growth rate, ΔK is the range of the stress intensity factor, and m and C are constants that depend on the material properties and the loading conditions.
To apply this equation to a pressure vessel under earthquake loading, you would need to determine the stress intensity factor at the location of the crack, which depends on the geometry and loading conditions of the structure. This can be done using finite element analysis or experimental testing.
Once you have determined the stress intensity factor, you can calculate the crack growth rate using the Paris equation and integrate this over the expected number of cycles of earthquake loading to predict the fatigue life of the structure.
There are many articles on the fatigue of pressure vessels that you may find helpful. Here are a few examples:
- "Fatigue design of pressure vessels: a review of current practice and research needs" by H.H. Shen and D.J. Klingerman
- "Fatigue life prediction of pressure vessels subjected to random loading" by M. Rahnama and M.H. Kadivar
- "Fatigue life prediction of pressure vessels using finite element method" by H.H. Shen and R.M. Jones
These articles discuss various methods for predicting the fatigue life of pressure vessels, including the Paris equation and finite element analysis.
Hello Thank you for the answer regarding the determination of fatigue life in the support of pressure vessels. What you wrote is correct and by determining the stress intensity factor at the site, the crack growth rate and the number of cycles can be obtained based on the Paris equation. Which ASME section should I use for variable amplitude loading in Paris? My colleagues have sent an article about this, which I am sending for you to read and send your opinion
Investigating the behavior of cracks in welded zones of supporting structure of spherical pressure vessel under seismic loading
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