Engineering Research Equipment: Advanced Servohydraulic TestInstrument for In-Situ Ice Testing

工程研究装备：先进伺服液压原位冰测试仪

• 批准号: 9610297
• 负责人: John Dempsey
• 金额: $ 6.56万
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 1999-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9610297&HistoricalAwards=false
• 关键词: Engineering; Research; Equipment; Advanced; Servohydraulic

9610297 Dempsey The Department of Civil and Environmental Engineering at Clarkson University will purchase an Advanced Servohydraulic Test Instrument For In-Situ Ice Testing which will be dedicated to support research in engineering. The research will be used for several research projects, including in particular the constitutive behavior and fracture of single- cum-multiple ice crystals, scaling laws for the fracture and constitutive behavior of sea ice and structural composites, and the time dependent creep and fracture of freshwater ice. This advanced test instrument will have to be constructed by the assembly and fabrication of specific components; it is not possible to purchase an "off-the-shelf" in-situ ice testing instrument with the capabilities required. The purpose is to test ice as it exists in nature -- with the resident temperature, grain size, and density profiles, as well as the varied grain orientations that occurs with the growth of an ice sheet-at the warm (just a few degrees below freezing) temperatures that are of practical interest in ice engineering. It is very difficult to test sea ice above -15 C, or freshwater ice above -8 C, in the conventional laboratory setup because the ice is changing as a material. Impurities on the grain boundaries are melting, brine pockets are changing shape and migrating downward. In addition, from the viewpoint of an adequate specimen size, the test specimen sizes that can be tested in the laboratory have been shown to be sub-size. For this reason, there exists an urgent, need for an advanced in-situ ice test instrument at Clarkson University to augment the research currently being carried out for several funded projects. The test instrument will be used to test ice grown in a specially designed 3 x 3 x l.2 m test basin.

9610297 Dempsey克拉克森大学土木与环境工程系将购买一台用于原位冰测试的先进伺服液压测试仪器，该仪器将专门用于支持工程研究。该研究将用于几个研究项目，包括单和多冰晶的本构行为和断裂，海冰和结构复合材料的断裂和本构行为的尺度规律，以及淡水冰的蠕变和断裂的时间依赖。这种先进的测试仪器必须通过特定组件的组装和制造来构建；不可能购买到具有所需功能的“现成的”原位冰测试仪器。目的是测试冰在自然界中存在的情况——在温暖的温度下（仅比冰点低几度），测试冰的温度、颗粒大小和密度分布，以及随着冰盖的生长而发生的不同颗粒方向。在传统的实验室设置中，很难测试-15℃以上的海冰或-8℃以上的淡水冰，因为冰的材料正在发生变化。晶界上的杂质正在熔化，盐水袋正在改变形状并向下迁移。此外，从适当的试样尺寸的角度来看，可以在实验室测试的试样尺寸已被证明是亚尺寸。因此，克拉克森大学迫切需要一种先进的原位冰测试仪器，以加强目前正在进行的几个资助项目的研究。该测试仪器将用于测试在一个专门设计的3 × 3 × 1.2米的测试盆中生长的冰。