Specimen Geometry and Size Effects on the Fracture of River and Lake Ice

冰体断裂研究的主要动机是预测冰体的最大传荷载能力和最小承载能力。这个问题在大多数涉及冰的工程应用中是常见的：即，北极结构，桥墩，船舶的载荷，冰岛，冰路，飞机跑道等的承载能力。本研究的具体目的是研究加载速率、试验温度和淡水冰的微观结构对其断裂韧性的影响。在进行此类研究之前，将确定试样尺寸和形状的影响。在冬季，北方许多河流和湖泊上常见的三种冰将被检查。本研究所得的资料对于预测冰的最大承载能力是非常有用的；这将导致标准化的冰断裂测试技术的建立。该PI非常有资格进行拟议的研究。建议颁发奖项。

The primary motivation for fracture research on ice is related to the prediction of maximum load-transmitting capability and the minimum load- bearing capacity of ice masses. This proplem is common to most engineering applications involving ice: i.e., loads on arctic structures, bridge piers, ships, and bearing capacity of ice islands, ice roads airstrips, etc. The specific objective of the proposed research is to investigate the effect of loading rate, testing temperature, and microstructure of fresh water ice on its fracture toughness. Preliminary to such studies, the effect of specimen size and shape will be established. Three types of ice that are common on many nortnern rivers and lakes during winter will be examined. The information obtained in this research will be extremely useful for the prediction of maximum load-carrying capacity of ice; and it will lead to the establishment of standardized fracture testing techniques for ice. The PI ie highly qualified to conduct the proposed research. An award is recommended.