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

9610297邓普西克拉克森大学土木工程和环境工程系将购买一台先进的现场冰测试伺服液压测试仪器，该仪器将专门用于支持工程研究。这项研究将用于几个研究项目，特别是单个和多个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标度律，以及淡水冰的随时间变化的蠕变和断裂。这种先进的测试仪器必须通过组装和制造特定的部件来建造；不可能购买具有所需能力的“现成”现场冰测试仪器。其目的是在温暖的(仅低于冰点几度)温度下测试自然界中存在的冰--包括驻留温度、颗粒大小和密度分布，以及随着冰盖的生长而出现的不同颗粒取向--这在冰工程中具有实际意义。在传统的实验室中，测试-15℃以上的海冰或-8℃以上的淡水冰是非常困难的，因为冰作为一种材料正在发生变化。晶界上的杂质正在融化，卤水口袋正在变形并向下迁移。此外，从合适的样品尺寸的角度来看，可以在实验室测试的样品尺寸已经被证明是亚尺寸的。出于这个原因，克拉克森大学迫切需要一种先进的现场冰测试仪器，以加强目前正在为几个资助项目进行的研究。该测试仪器将用于测试在一个特殊设计的3x3x1.2m测试池中生长的冰。

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.