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1. 发明授权

US5905204A Test specimen design incorporating multiple fracture sites and multiple strain material fractures 失效
$Test specimen design incorporating multiple fracture sites and multiple strain material fractures$
标题翻译：包括多个骨折部位和多个应变材料骨折的试样设计
公开(公告)号：US5905204A
公开(公告)日：1999-05-18
申请号：US40376
申请日：1998-03-18
申请人： Virginia G. DeGiorgi , Andrew B. Geltmacher
发明人： Virginia G. DeGiorgi , Andrew B. Geltmacher
IPC分类号： G01N3/00 , G01N3/02 , G01N3/04 , G01N3/08
CPC分类号： G01N3/02 , G01N2203/0067 , G01N2203/0254 , G01N2203/027 , G01N2203/0282 , G01N2203/0494
摘要： A material test specimen design is taught for the determination of criticaltrain and stress states for multiaxial fracture. The objective of the specimen is to increase the amount of data obtained per specimen while retaining simplicity in testing procedure by using standard tension testing machines to generate the primary deformation of the specimen. The specimen, in conjunction with analytical or computational simulation, uses nonuniform deformation fields produced by secondary and tertiary strain concentrations to generate and track these multiaxial strain states to fracture. Typically, the primary deformation is uniaxial tension of a panel, the secondary strain concentration is a circular hole in the panel and the tertiary strain concentrations are areas of reduced thickness within the deformation field of the circular hole. Multiaxial strain ratios from -0.50 to -0.10 and control over fracture initiation sites may be generated by a test specimen design of the type taught by this invention.
摘要翻译：教授材料试样设计用于确定多轴断裂的临界应变和应力状态。样本的目标是增加每个样本获得的数据量，同时通过使用标准拉伸试验机来保持试样的初步变形，从而保持测试过程的简单性。样本与分析或计算模拟结合使用由二次和三次应变浓度产生的不均匀变形场，以产生和跟踪这些多轴应变状态进行断裂。通常，主变形是面板的单轴张力，二次应变集中在面板中为圆形孔，第三应变浓度为圆孔变形场内厚度减小的区域。通过本发明教导的类型的试样设计可以产生从-0.50到-0.10的多轴应变比和对断裂起始位置的控制。

2. 发明授权

US06405600B1 Test specimen design incorporating multiple fracture sites and multiple strain state material fractures 失效
$Test specimen design incorporating multiple fracture sites and multiple strain state material fractures$
标题翻译：包括多个断裂部位和多个应变状态材料裂缝的试样设计
公开(公告)号：US06405600B1
公开(公告)日：2002-06-18
申请号：US08845848
申请日：1997-04-28
申请人： Peter Matic , Richard K. Everett , Virginia G. DeGiorgi , Andrew B. Geltmacher
发明人： Peter Matic , Richard K. Everett , Virginia G. DeGiorgi , Andrew B. Geltmacher
IPC分类号： G01N1908
CPC分类号： G01N3/02 , G01N2203/0067 , G01N2203/0254 , G01N2203/027 , G01N2203/0282 , G01N2203/0494
摘要： A material test specimen design is taught for the determination of critical strain and stress states for multiaxial fracture. The objective of the specimen is to increase the amount of data obtained per specimen while retaining simplicity in testing procedure by using standard tension testing machines to generate the primary deformation of the specimen. The specimen, in conjunction with analytical or computational simulation, uses nonuniform deformation fields produced by secondary and tertiary strain concentrations to generate and track these multiaxial strain states to fracture. Typically, the primary deformation is uniaxial tension of a panel, the secondary strain concentration is a circular hole in the panel and the tertiary strain concentrations are areas of reduced thickness within the deformation field of the circular hole. Multiaxial strain ratios from −0.50 to −0.10 and control over fracture initiation sites may be generated by a test specimen design of the type taught by this invention.
摘要翻译：教授材料试样设计用于确定多轴断裂的临界应变和应力状态。样本的目标是增加每个样本获得的数据量，同时通过使用标准拉伸试验机来保持试样的初步变形，从而保持测试过程的简单性。样本与分析或计算模拟结合使用由二次和三次应变浓度产生的不均匀变形场，以产生和跟踪这些多轴应变状态进行断裂。通常，主变形是面板的单轴张力，二次应变集中在面板中为圆形孔，第三应变浓度为圆孔变形场内厚度减小的区域。通过本发明教导的类型的试样设计可以产生从-0.50到-0.10的多轴应变比和对断裂起始位置的控制。

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