Study on cyclic constitutive model of stainless-cladding bimetallic steel with different cladding ratios
Ban Huiyong1,2 Zhu Juncheng3 Shi Gang1 Zhang Yong3 Li Yi4
1. Key Laboratory of Civil Engineering Safety and Durability of the Education of Ministry, Tsinghua University, Beijing 100084, China;
2. School of Civil Engineering, Tsinghua University, Beijing 100084, China; 3. Beijing Jiaotong University, Beijing 100044, China;
4. Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,
Beijing University of Technology, Beijing 100124, China
Abstract： In order to study the mechanical response of stainless-cladding (SC) bimetallic steel with different cladding ratios under earthquake, tests of 23 specimens made of 316L+Q235B SC bimetallic steel with a thickness of 3+3mm were conducted under monotonic tension and compression loading as well as 15 different cyclic loading systems. The monotonic and cyclic behavior, macro-failure and micro-failure modes are analyzed. The cyclic envelop curves are fitted by using the Ramberg-Osgood three-parameter model and compared with the monotonic tensile curves. Based on the Chaboche plastic constitutive model, relevant parameters for the SC bimetallic steel are calibrated, and the tests are simulated numerically. Comparative analysis, such as steel with different cladding ratios on cyclic envelop curve, cyclic constitutive relation and hysteresis curves are carried out. The experimental results show that the SC bimetallic steel with larger cladding ratios still exhibits significant cyclic strengthening under cyclic loading. Mixed hardening characteristics are observed, including isotropic and kinematic hardening. The hysteretic curves are plump. With an increase of cyclic number, unloading stiffness and initial stiffness of the reloading curves are significantly degraded. The Ramberg-Osgood model fits the cyclic envelop curves well. The constitutive model proposed herein is proved good for simulating the cyclic responses of the SC bimetallic steel. The specific mechanical indexes of the SC bimetallic steel and 3+5mm thickness 316L+Q235B SC bimetallic steel under cyclic loading are significantly different. The research results provide an important basis for developing a uniform cyclic constitutive model of the advanced bimetallic steel.
班慧勇 朱俊成 施 刚 张 勇 李 易. 不同复合比下不锈钢复合钢材循环本构模型研究#br#[J]. 土木工程学报, 2019, 52(10): 67-74.
Ban Huiyong Zhu Juncheng Shi Gang Zhang Yong Li Yi. Study on cyclic constitutive model of stainless-cladding bimetallic steel with different cladding ratios. 土木工程学报, 2019, 52(10): 67-74.
