Ductile Fracture in Constrained Thin Metal Films

约束金属薄膜中的延性断裂

• 批准号: 9522206
• 负责人: Michael Kassner
• 金额: $ 14.55万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9522206&HistoricalAwards=false
• 关键词: Ductile; Fracture; Constrained; Thin; Metal

9522206 Kassner The ductile fracture Mechanisms of constrained metals will be studied using an integrated mechanics-materials science approach. Common engineering situations involving constrained metals are thin interlayers such as welds and brazes, metal interconnects in integrated circuits and some composites. Current theories for ductile fracture are generally based on cavity growth which in turn require unrealistically large plastic strains. two new cavity expansion models that do not require macroplasticity or cavity nuclei coalescence based mechanisms appear to be more reasonable. High triaxial stress states will be studies using silver interlayer specimens that are free of bulk defects. Changes in the void microstructure of the interlayer will be examined at small plastic strains via the scanning electron microscope and high voltage transmission electron microscopy. ***

9522206 Kassner将使用综合力学-材料科学方法研究约束金属的韧性断裂机制。 涉及约束金属的常见工程情况是薄夹层，如焊接和钎焊，集成电路和某些复合材料中的金属互连。 目前的韧性断裂理论一般是基于空洞的增长，这反过来又需要不切实际的大塑性应变。 两种新的空穴膨胀模型，不需要基于宏观塑性或空穴核聚结的机制，似乎是更合理的。 高三轴应力状态将使用无体缺陷的银夹层试样进行研究。 通过扫描电子显微镜和高压透射电子显微镜，在小的塑性应变下检查夹层的空隙微观结构的变化。 ***