LAWS FOR WORK-HARDENING AND LOW-TEMPERATURE CREEP
LAWS FOR WORK-HARDENING AND LOW-TEMPERATURE CREEP
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DOI：
10.1115/1.3443340
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发表时间：
1976-01-01
影响因子：
1.2
通讯作者：
KOCKS, UF
中科院分区：
文献类型：
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作者：
KOCKS, UF
多晶铝、铜和不锈钢的真实应力-应变曲线在很大范围内可以通过饱和应力的指数方法充分表示。这一经验定律最初由 Voce 提出，经过扩展以描述温度和应变率依赖性，并在位错存储和动态恢复率的框架中建立了物理基础。该形式可以应用于相同温度和应变率范围内的蠕变稳态极限；因此，蠕变速率的应力指数必须强烈依赖于温度，而活化能则弱地依赖于应力。在接近一半的熔化温度时，可用的加工硬化数据和可用的蠕变数据重叠，它们是匹配的。将所提出的定律外推到更高的温度表明可能不需要新的机制来描述高温蠕变。一个新的瞬态蠕变微分方程也遵循经验加工硬化定律。
The true stress-strain curves of polycrystalline aluminum, copper, and stainless steel are shown to be adequately represented by an exponential approach to a saturation stress over a significant range. This empirical law, which was first proposed by Voce, is expanded to describe the temperature and strain-rate dependence, and is put on a physical foundation in the framework of dislocation storage and dynamic recovery rates. The formalism can be applied to the steady-state limit of creep in the same range of temperatures and strain rates; the stress exponent of the creep rate must, as a consequence, be strongly temperature dependent, the activation energy weakly stress dependent. Near half the melting temperature, where available work-hardening data and available creep data overlap, they match. Extrapolation of the proposed law to higher temperatures suggests that no new mechanisms may be necessary to describe high-temperature creep. A new differential equation for transient creep also follows from the empirical work-hardening law.