Nonlinear Ultrasonic Nondestructive Evaluation of Isotropic and Composite Plates: Theory and Experiment

各向同性板和复合板的非线性超声无损评估：理论与实验

• 批准号: 9634829
• 负责人: Mark Hamilton
• 金额: $ 24.82万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634829&HistoricalAwards=false
• 关键词: Nonlinear; Ultrasonic; Nondestructive; Evaluation; Isotropic

9634927 Leckie This project is to study the fundamental aspects of joints in metal (MMC) and ceramic (CMC) matrix composite structures. The research philosophy emphasizes the understanding of the underlying mechanics and its relationship to microstructure and processing. The research approach is based on the design, manufacturing, characterization and analysis of relatively simple joint geometries which allow the study of individual features of the physical problem and its underlying mechanisms, e.g. the strength of the interfaces defined by the fiber ends and the associated debond process. The MMC research will focus on aluminum alloys reinforced with polycrystalline alumina fibers while the CMC joints will be fabricated by vacuum infiltration of multi-alumina slurries into polycrystalline alumina fiber cloth arranged in layers with prescribed discontinuities. The microstructure and delamination resistance of these joints can be modified by suitable control of the sintering temperature and other manufacturing parameters. The emphasis will be identifying the relevant mechanisms and their relationship to processing via microstructure and defects. ***

9634927 Leckie该项目是研究金属（MMC）和陶瓷（CMC）基复合材料结构中接头的基本方面。 研究哲学强调对基础力学及其与微观结构和加工的关系的理解。 该研究方法是基于设计，制造，表征和分析相对简单的关节几何形状，允许研究的物理问题及其潜在的机制，例如，由纤维端部和相关的脱粘过程定义的接口的强度的个别功能。 MMC的研究将集中在多晶氧化铝纤维增强的铝合金，而CMC接头将通过多氧化铝浆料真空渗透到多晶氧化铝纤维布排列在规定的不连续层。 通过适当控制烧结温度和其他制造参数，可以改变这些接头的微观结构和抗分层性。 重点将是通过微观结构和缺陷识别相关机制及其与加工的关系。 ***