Microplasticity Near Reinforcements

增强体附近的微塑性

• 批准号: 9527751
• 负责人: Andreas Mortensen
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-01 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527751&HistoricalAwards=false
• 关键词: Microplasticity; Near; Reinforcements

9527751 Mortensen This research uses techniques developed under a prior NSF grant to study microplasticity near inclusions embedded in an elastoplastic material subjected to a uniform far-field stresses. The program employs silver chloride (AgCl) as a model material for the study of metals containing reinforcements or inclusions larger than a micrometer in size. AgCl is an ionic solid which deforms by dislocation slip and its similarity with a metal from that standpoint is well established. Unlike a metal, AgCl is transparent, stress birefringent, and allows for the observation of dislocations at low densities by ambient-temperature decoration with metallic silver. Data are quantitatively compared with two existing models for the deformation behavior of two-phase materials, the Eshelby equivalent inclusion method and finite element techniques. The differences, if any, between the empirical results and the predictions of the models help guide efforts to incorporate microstructural features and dislocation mechanics into future models. %%% This study provides experimental micromechanical data, sampled within a well-established metal analog, at a microscopic scale and within bulk material. Results from this work are relevant to a wide array of engineering structural materials, including two-phase alloys and metal- matrix composites. ***

小行星9527751 本研究使用先前NSF资助下开发的技术，研究受均匀远场应力作用的弹塑性材料中嵌入的夹杂物附近的微塑性。 该程序采用氯化银（AgCl）作为模型材料，用于研究含有尺寸大于1微米的增强物或夹杂物的金属。 氯化银是一种离子固体，它通过位错滑移变形，从这个角度来看，它与金属的相似性是很好的。 与金属不同，氯化银是透明的、应力双折射的，并且允许通过用金属银进行环境温度装饰来观察低密度的位错。 数据进行定量比较，与现有的两个模型的变形行为的两相材料，Eshelby等效夹杂物法和有限元技术。 经验结果和模型预测之间的差异（如果有的话）有助于指导将微观结构特征和位错力学纳入未来模型的努力。 本研究提供了实验微观力学数据，采样内一个完善的金属模拟，在微观尺度和散装材料。 这项工作的结果与广泛的工程结构材料，包括两相合金和金属基复合材料有关。 ***