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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >An experimental study on the effect of damage on the stress-strain
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An experimental study on the effect of damage on the stress-strain

机译：损伤对应力应变影响的实验研究

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An experimental study has been conducted to assess the interaction between work-hardening behaviour and damage accumulation for a model Al-Si composite, which contained 20 percent Si particles. In order to separate the effects of work-hardening from damage accumulation, damage in the form of cracked silicon particles was introduced in the material by cold rolling. After cold rolling, the matrix was returned to its initial state by a recrystallization heat treatment. Tensile tests were then conducted on the material with different levels of damage and with different matrix tempers, i.e. matrix in the supersaturated solid solution or in the T6 condition. The work-hardening behaviour of the samples was then examined by numerically differentiating the experimentally determined stress-strain data. A characteristic change in work-hardening, which served as a signature of damage, could readily be observed. The changes in work-hardening behaviour were rationalized by a model for composite hardening which included a dislocation-based constitutive model for the matrix and a load transfer model for describing the stresses in the particles. Good agreement was observed between the experiments and the model. The key conclusion of the work is to support the supposition of [M.T. Riser, F.W. Zok, D.S. Wilkinson, Ada Mater. 44 (1996) 3465-3476] that the critical parameter controlling tensile fracture is not the level of damage but the rate of damage evolution.
机译：已进行了一项实验研究，以评估含20％Si颗粒的模型Al-Si复合材料的加工硬化行为与损伤累积之间的相互作用。为了将加工硬化的影响与损伤累积分开，通过冷轧将裂纹的硅颗粒形式的损伤引入材料中。冷轧后，通过重结晶热处理将基体恢复到其初始状态。然后对具有不同损伤程度和不同基体回火度的材料（即过饱和固溶体或T6条件下的基体）进行拉伸测试。然后，通过数值区分实验确定的应力应变数据来检查样品的加工硬化行为。可以很容易地观察到加工硬化的特征变化，这是损坏的标志。通过复合硬化模型合理化了工作硬化行为的变化，该模型包括基体的基于位错的本构模型和用于描述颗粒应力的载荷传递模型。实验和模型之间观察到良好的一致性。这项工作的主要结论是支持[M.T. Riser，F.W。Zok，D.S。Wilkinson，Ada Mater。 44（1996）3465-3476]，控制拉伸断裂的关键参数不是损伤的程度，而是损伤发展的速率。

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