Paper Presented by Huanxin Yuan - [email protected] © Y.Q. Wang, T. Chang, Y.J. Shi, H.X. Yuan & D.F. Liao, Tsinghua University 1 Experimental Study on the Constitutive Relation of Austenitic Stainless Steel S31608 Under Monotonic and Cyclic Loading Y.Q. Wang a,* . T. Chang a , Y.J. Shi a , H.X. Yuan a , D.F. Liao b a Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, PR China b Measure Stick-Curtain Wall Structural Fittings Co., Ltd., Shenzhen 518000, PR China Abstract In order to study the constitutive relation of domestic austenitic stainless steel S31608 (AISI 316, EN 1.4401) under monotonic and cyclic loading, different types of specimens were tested. Based on the Ramberg-Osgood model, modified by Gardner and Nethercot, the parameters that described stress-strain relationship under monotonic loading were obtained. Comparison between data obtained using different types of specimens was made and the influence of the welding and rolling direction was discussed. The cyclic skeleton curves were obtained by fitting the Ramberg-Osgood model to the curves. Parameters of the hardening model of cyclic plasticity were calibrated from test data and the test was simulated with ABAQUS. The results show that, stainless steel exhibit remarkable nonlinearity, the Ramberg- Osgood model modified by Gardner and Nethercot provide excellent agreement with experimental data and welding and rolling direction have a direct influence on the stress-strain relationship. Under cyclic loading, with the increase of cyclic loops, stainless steel exhibit cyclic hardening behaviour, and the simulated curves and the test curves agree fairly well. Therefore, the influence of welding and rolling direction on the stress-strain relationship should be taken into consideration in projects and the constitutive relation under cyclic loading should be used if the structure is subjected to cyclic loading. Keywords stainless steel; constitutive relation; monotonic loading; cyclic loading; finite element analysis 1 Introduction Under a seismic event, the structural members, especially the dissipative elements, usually experience a small number of heavy cyclic loads accompanied with large plastic deformation within a short time-frame. The response of the element is mainly depended on the geometric dimension and the hysteretic behaviour of the material, which can be studied by large strain extremely low cyclic fatigue testing [1-4]. In the seismic design of steel structures, numerical simulation is widely used because of the high cost of the tests. Besides, the constitutive relation under cyclic loading is different from that under monotonic loading and is more complex in numerical simulation. Therefore, an accurate constitutive relation and calculation model of steel under cyclic loading is quite important to the numerical simulation [5]. Several simplified calculation models have been proposed by foreign researchers for simulating the behaviour of steel under cyclic loading. Comparisons have been made between tests and numerical simulations to verify the precision and reliability of these calculation models [6,7]. In recent years, more stainless steel structures have been built because stainless steel has many advantages, such as the attractive appearance, good corrosion resistance, ease of maintenance and low life cycle cost [8,9]. Several researchers have carried out a series of tests and numerical simulation to study the low cycle fatigue behaviour of stainless steel [10-13], but the tests on the large strain extremely low cycle fatigue are quite limited. However, because of the limitations in the development of the industry and economy in China, there are some differences in the quality, material properties and processing technology of stainless steel at home and aboard. The calculation models proposed by foreign researchers are relative with the processing technology and material properties of stainless steel, which may not apply to domestic ones. Therefore, to give reference to the design of stainless steel structures and seismic response, a total of 29 domestic stainless steel specimens were tested in the monotonic and cyclic loading to study the behaviour of the material and the tests were also simulated by finite element software ABAQUS. 2 Stress-strain relationships of stainless steel 2.1 Stress-strain relationships under monotonic loading The stress-strain relationship of stainless steel is different from that of carbon steel which exhibits a rounded stress- strain curve with no definitely yielding point, considerable stain hardening, and high ductility [14]. Since the absence of a definitely yielding point, the stress at 0.2% plastic strain is adopted as the equivalent yield strength (the 0.2% proof
Experimental Study on the Constitutive Relation of Austenitic Stainless Steel S31608 Under Monotonic and Cyclic Loading
Jun 24, 2023
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