Micromechanical Modelling of Ductile Failure

延性破坏的微机械建模

• 批准号: 8618007
• 负责人: Alan Needleman
• 金额: $ 22.83万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-01-15 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8618007&HistoricalAwards=false
• 关键词: Micromechanical; Modelling; Ductile; Failure

The development of stronger and tougher structural materials requires a better understanding between macroscopic measures of ductility and microstructural mechanisms of the fracture process. This is a research topic which is of growing importance as the limitations of continuum mechanics in the microscale has been recognized. The research investigates micromechanical modelling of the fracture process. The approach involves constitutive descriptions of nucleation, growth and coalescence of micro voids. Of particular importance in the void nucleation by particle decohesion and the mechanisms of void coalescence. Large scale numerical analyses will be employed to carry the micromodelling into the macroscale where comparisons can be made with observations of ductile behavior in fracture. The principal investigator has an international reputation for his work in numerical simulation of ductile fracture. This research program provides an opportunity to extend the modelling of the fracture process into the microscale. An award is recommended.

为了开发更强、更韧的结构材料，需要更好地理解塑性的宏观测量和断裂过程的微观结构机制。随着人们认识到连续介质力学在微观尺度上的局限性，这是一个日益重要的研究课题。本研究探讨了断裂过程的微观力学模型。该方法涉及微孔洞的成核、生长和聚并的本构描述。特别重要的是在粒子解聚和孔洞合并机制的孔洞成核。将采用大规模数值分析将微观模拟带入宏观尺度，与观察到的断裂韧性行为进行比较。首席研究员在韧性断裂数值模拟方面的工作享有国际声誉。该研究项目提供了一个将压裂过程建模扩展到微观尺度的机会。建议颁发奖项。