Full-range stress-strain curves for stainless steel alloys
Full-range stress-strain curves for stainless steel alloys
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DOI：
10.1016/s0143-974x(02)00018-4
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发表时间：
2003-01-01
影响因子：
4.1
通讯作者：
Rasmussen, KJR
中科院分区：
文献类型：
--
作者：
Rasmussen, KJR
本文推导了不锈钢合金的应力-应变曲线在全应变范围内有效的表达式。对于极限状态下应力超过0.2%的不锈钢构件和构件的设计和数值模拟，该表达式是有用的。在这个应力范围内，目前基于Ramberg-Osgood表达式的应力-应变曲线变得严重不准确，主要是因为它们是对低于0.2%标准应力的曲线拟合的外推。对于应变硬化明显的合金，这一外推变得特别不准确。还开发了的表达式。确定给定值的Ramberg-OsGood参数(E-0，sigma(0.2)，n)的极限抗拉强度(sigma(U))和应变(epsilon(U))。这些表达式与广泛的实验数据进行了比较，表明对于所有结构类别的不锈钢合金都是相当准确的。根据Sigma(U)和epsilon(U)的表达式，可以由Ramberg-Osgood参数(E-0，Sigma(0.2)，n)构建整个应力-应变曲线。(C)2002爱思唯尔科学有限公司。保留所有权利。
The paper develops an expression for the stress-strain curves for stainless steel alloys which is valid over the full strain range. The expression is useful for the design and numerical modelling of stainless steel members and elements which reach stresses beyond the 0.2% proof stress in their ultimate limit state. In this stress range, current stress-strain curves based on the Ramberg-Osgood expression become seriously inaccurate principally because they are extrapolations of curve fits to stresses lower than the 0.2% proof stress. The extrapolation becomes particularly inaccurate for alloys with pronounced strain hardening.The paper. also develops expressions for. determining the ultimate tensile strength (sigma(u)) and strain (epsilon(u)) for given values of the Ramberg-Osgood parameters (E-0, sigma(0.2), n). The expressions are compared with a wide range of experimental data and shown to be reasonably accurate for all structural classes of stainless steel alloys. Based on the expressions for sigma(u) and epsilon(u), it is possible to construct the entire stress-strain curve from the Ramberg-Osgood parameters (E-0, sigma(0.2), n). (C) 2002 Elsevier Science Ltd. All rights reserved.