S30408奥氏体不锈钢高温力学性能试验研究
发布时间：2018-10-30 20:53
【摘要】：不锈钢材料高温力学性能是不锈钢结构抗火设计与数值模拟分析的重要参数。相对于碳素钢,不锈钢材料具有强非线性、比例极限低、无明显屈服平台、各向异性、应变硬化显著等特点,高温下两种材料的力学性能存在着较大的差异。该文利用MTS810试验系统对S30408奥氏体不锈钢进行了常温、高温稳态和高温瞬态试验研究,并将试验结果与《欧洲规范》以及已有的研究结果进行了对比分析。利用稳态试验结果,对影响高温下不锈钢材料力学性能的硬化指数n_θ和m_θ进行了修正,提出高温下不锈钢材料本构关系表达式,并给出了高温下不锈钢材料的初始弹性模量、屈服强度和极限强度的折减系数。对比分析了稳态试验结果与瞬态试验结果,结果表明:通过两种试验方法获得的高温下不锈钢材料应力-应变曲线存在一定的差异;在温度600℃范围内,差异不明显,当温度超过600℃时,两者差异随温度升高而逐渐增大。
[Abstract]:High temperature mechanical properties of stainless steel are important parameters for fire resistance design and numerical simulation of stainless steel structures. Compared with carbon steel, stainless steel has the characteristics of strong nonlinearity, low proportional limit, no obvious yield platform, anisotropy, and remarkable strain hardening. The mechanical properties of the two materials are different at high temperature. In this paper, S30408 austenitic stainless steel was tested at room temperature, high temperature steady state and high temperature transient state with MTS810 test system. The experimental results were compared with those of European Standard and existing research results. Based on the steady-state test results, the hardening indices n _ 胃 and m _ 胃, which affect the mechanical properties of stainless steel materials at high temperature, are modified, and the constitutive relation expressions of stainless steel materials at high temperature are proposed. The initial elastic modulus, yield strength and ultimate strength of stainless steel at high temperature are given. The results of steady state test and transient test are compared and analyzed. The results show that the stress-strain curves of stainless steel under high temperature obtained by two test methods are different to some extent. The difference is not obvious in the temperature range of 600 鈩，
本文编号：2301153
[Abstract]:High temperature mechanical properties of stainless steel are important parameters for fire resistance design and numerical simulation of stainless steel structures. Compared with carbon steel, stainless steel has the characteristics of strong nonlinearity, low proportional limit, no obvious yield platform, anisotropy, and remarkable strain hardening. The mechanical properties of the two materials are different at high temperature. In this paper, S30408 austenitic stainless steel was tested at room temperature, high temperature steady state and high temperature transient state with MTS810 test system. The experimental results were compared with those of European Standard and existing research results. Based on the steady-state test results, the hardening indices n _ 胃 and m _ 胃, which affect the mechanical properties of stainless steel materials at high temperature, are modified, and the constitutive relation expressions of stainless steel materials at high temperature are proposed. The initial elastic modulus, yield strength and ultimate strength of stainless steel at high temperature are given. The results of steady state test and transient test are compared and analyzed. The results show that the stress-strain curves of stainless steel under high temperature obtained by two test methods are different to some extent. The difference is not obvious in the temperature range of 600 鈩，
本文编号：2301153
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