BRIGE: "Smart" Toughness Enhancement in Metal-Matrix Composites: Linking Structure, Properties and Design

BRIGE：金属基复合材料的“智能”韧性增强：连接结构、性能和设计

• 批准号: 0824352
• 负责人: Michele Manuel
• 金额: $ 17.5万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0824352&HistoricalAwards=false
• 关键词: BRIGE; Smart; Toughness; Enhancement; Metal

The research objective of this award is to identify the structure-property relationship between the phase transformations occurring during the deformation of a metal-matrix composite reinforced with shape memory alloys and fracture toughness. Magnesium metal-matrix composites will be fabricated into two types of fracture toughness specimens, one reinforced with pseudoelastic wires and the other with shape memory alloy wires. The phase transformations in the wires will be continuously monitored during J-integral testing through the use of electrical resistivity measurements. Concurrently, modified single fiber pullout specimens will be tested to establish a relationship between the matrix/reinforcement interfacial strength and composite toughness.If successful, the results of this research will lead to improvements in the fracture toughness of metal-matrix composites, specifically self-healing alloy composites. The design and development of a light-weight self-healing alloy composite that can repair itself in response to structural damage is critical in systems that are at present impractical to repair in service. The primary goal of this work is to utilize a mechanistic approach to identify and model the role of adaptive microstructures as reinforcements in ?smart? metal-matrix composites. This provides the opportunity and a methodology to enhance the mechanical properties of metals that currently demonstrate limited fracture toughness by processing and reinforcing these materials with adaptive elements. The proposed work provides a significant contribution towards the development of high specific strength self-healing structural metals that can be toughened using shape memory alloy wire reinforcements. An integral part of this program is the enhancement and promotion of diversity using several education initiatives targeted to students at all grade levels.

该奖项的研究目标是确定形状记忆合金增强金属基复合材料变形过程中发生的相变与断裂韧性之间的结构-性能关系。 将镁基复合材料制备成两种类型的断裂韧性试样，一种是用伪弹性丝增强的，另一种是用形状记忆合金丝增强的。 在J积分测试期间，将通过使用电阻率测量来连续监测导线中的相变。同时，将对改进的单纤维拔出试样进行测试，以建立基体/增强体界面强度与复合材料韧性之间的关系，如果成功，本研究的结果将导致金属基复合材料，特别是自愈合合金复合材料的断裂韧性的改善。 设计和开发一种轻质自修复合金复合材料，它可以在结构损坏时进行自我修复，这对目前无法在使用中进行修复的系统至关重要。 这项工作的主要目标是利用一种机械的方法来识别和建模的自适应微观结构的增强作用？聪明吗金属基复合材料 这提供了机会和方法，以提高目前表现出有限的断裂韧性的金属的机械性能，通过加工和增强这些材料与自适应元素。 所提出的工作提供了一个显着的贡献，对发展的高比强度自愈合结构金属，可以使用形状记忆合金丝增强增韧。 该方案的一个组成部分是利用针对各年级学生的若干教育举措加强和促进多样性。