Refined Model for the Stress-Strain Curve of Austenitic Stainless-Steel Materials at Elevated Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 4
Abstract
Based on the room-temperature and high-temperature test method (steady state and transient state), a series of mechanical property tensile tests was carried out on S30408 (AISI304) austenitic stainless-steel materials. There were 72 specimens in total, including 8 specimens at room temperature, 28 specimens for a high-temperature steady-state test, and 36 specimens for a high-temperature transient-state test. Through the experimental investigation, the mechanical properties of stainless steel at room and elevated temperatures were obtained. The stress-strain curves of stainless steel at elevated temperatures were given and the development laws in a large range of strain were revealed. The tensile test results show that (1) with increasing temperature, the mechanical properties (elastic modulus, yield strength, and ultimate strength) of stainless steel continuously decrease; (2) the nominal yield strength of stainless steel in corner areas is higher than that in flat areas at the same temperature; and (3) the test loading rate has a significant effect on the stress-strain curve of stainless steel at elevated temperatures; with a higher loading rate, all strength indexes of stainless steel at elevated temperatures are improved. In this paper, a theoretical model for stress-strain curves of stainless steel at elevated temperatures, containing five mechanical property parameters, was developed by theoretical derivation, and the accuracy of the theoretical model was verified by experimental results. Next, the high-temperature reduction coefficients of the five mechanical property parameters in the theoretical model were analyzed by numerical simulation, their calculation formulas were fitted, and a reliability analysis was carried out on the five parameters using SPSS. Finally, a complete theoretical model of the stress-strain curve of stainless steel at elevated temperatures was proposed that can accurately predict the mechanical properties of austenitic stainless steel at elevated temperatures.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (51378105, 51878146, and 51608234) and National Key Research and Development Program of China (2017YFC0703802). The research was sponsored by Jiangsu Provincial Qing Lan Project, Jiangsu Provincial Six Talent Peaks Project (JZ-001), and Jiangsu Provincial Natural Science Foundation (BK20160534). These sources of financial support are gratefully acknowledged.
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©2020 American Society of Civil Engineers.
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Received: May 14, 2019
Accepted: Aug 26, 2019
Published online: Jan 23, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 23, 2020
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