ABSTRACT Ductility of metallic materials has practical importance in evaluating structural integrity against ductile fracture or creep rupture but it changes in a more complicated fashion than strength . In order to provide a means to predict the ductility under arbitrary conditions, a model applicable to wide ranges of temperatures and loading conditions was developed . This model consists of an equation describing the dependency on temperature and strain rate in a combined way and a power-law function of stress but emphasis is placed on the former which has two terms representing the behaviour at high and low temperatures. Based on the experimental data from various tests on four materials, effectiveness of the model was demonstrated. Relations between equivalent stress and equivalent strain rate defined in conjunction with the ductility model were also modelled by a similar equation with two terms, allowing the accurate prediction of the ductility in a purely analytical way.

中文翻译：

---

金属材料在大范围温度和载荷条件下的断裂延展性建模，第 I 部分：基本模型的开发

摘要 金属材料的延展性在评估结构完整性抵抗延展性断裂或蠕变断裂方面具有实际重要性，但它的变化方式比强度更复杂。为了提供一种方法来预测任意条件下的延展性，开发了一个适用于广泛温度和载荷条件的模型。该模型由一个以组合方式描述温度和应变率依赖性的方程和应力的幂律函数组成，但重点放在前者上，前者有两个项代表高温和低温下的行为。基于对四种材料的各种测试的实验数据，证明了模型的有效性。