Abstract
The correlation of the small punch creep (SPC) test results with uniaxial creep test results is challenging due to several factors. The stress state is equibiaxial in the SPC test and the equivalent stress is not constant as the punch is advancing into the disc. The classical use of Chakrabarty membrane theory, with a constant F/
Highlights
In the early 1980’s, the small punch test technique was developed in USA and Japan [1, 2]
The application of the small punch test in practice is critically sensitive to the existence of a reliable procedure for comparison with the results of conventional creep tests
In the European Code of Practice, a rough estimate of the conversion between force F in small punch test and stress σ in conventional test was made using the Chakrabarty membrane stretch model [21] giving a constant ratio of Ψ = F/
Summary
In the early 1980’s, the small punch test technique was developed in USA and Japan [1, 2] This technique has been applied to nuclear reactors, electric power plants for safety assessments. European researchers have carried out the pioneering work on small punch creep testing (SPC), i.e. testing at constant force, in the 1990’s [3,4]. In the European Code of Practice, a rough estimate of the conversion between force F in small punch test and stress σ in conventional test was made using the Chakrabarty membrane stretch model [21] giving a constant ratio of Ψ = F/. Due to the complexity of the SPC test itself and a lack of systematic test data for verification, up to now there is no generally accepted method to estimate uniaxial creep properties from it. We would like to propose a new simple procedure based on a detailed analysis of deflection vs. time curves available in parallel with the uniaxial creep data
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