Preliminary test results in support of integrated EPP and SMT design methods development

Abstract

Two-bar Thermal Ratcheting of SS316H at Temperature Range of 250 o C to 550 o C .

Support of the Development of EPP Plus SMT Design Method (FY2020 Test Results)

“…The SMT method requires testing of a specimen with accurate end displacement control for the control length. Wang et al (2014Wang et al ( , 2015Wang et al ( , 2016aWang et al ( , 2016b explained the details of the testing procedure. Testing was performed by cyclically applying an end-displacement to the control length while maintaining a constant internal pressure load.…”

“…A detailed plan has been developed and revised for the development of this EPP+SMT methodology (Wang et al, 2016a, 2016b, 2017a, 2019. The development of SMT-based design curves requires experimental data, and the parameters to be considered include elastic follow-up factor, strain range, loading rate, test temperature, hold time, and primary load.…”

Report on FY17 testing in support of integrated EPP-SMT design methods development

“…5. The experimental control logic used is similar to what was previously reported by Swindeman et al (1982) and is explained in detail in Wang et al (2013aWang et al ( , 2015Wang et al ( , 2016. In this method, two coupled servocontrolled machines are used to implement two bars in a parallel testing condition and the control system forces equal strains in the two specimens, yet allows the applied total load to be constant.…”

“…4b). The combined tension and compression hold was to minimize the barreling of the necked test section shown in the previous tension hold tests (Wang, et. al., 2016).…”

Report on an Assessment of the Application of EPP Results from the Strain Limit Evaluation Procedure to the Prediction of Cyclic Life Based on the SMT Methodology

“…Fig. 2 is an updated flow chart from the initial plan [5,6] and it shows the impact of recent test results from pressurization SMT and the EPP strain range analysis. The major elements in this flow chart include: three key assumptions that have been made to move forward; the near term test and evaluation actions required to validate these assumptions; and the long term test and analytical development required depending upon the outcome of the near term validation efforts.…”