Engineering Research Equipment Grant: Ultrasonic Velocity Testing Apparatus

匹兹堡大学土木工程系岩土工程小组目前正在进行以下力学特性的研究：(a)冻砂，(b)裂隙粘土，(c)颗粒组合。在这些情况下，需要测量的材料特性是弹性模量（杨氏弹性模量E、剪切模量G和泊松比v）。目前已有几种理论方法计算复合材料和含裂纹材料的模量。然而，需要实验室测试来确定这些理论模型是否确实适用于冻土、裂隙粘土和颗粒组合。本项目的目标是申请资金购买测量弹性模量的超声波测速仪。

The Geotechnical Engineering Group of the Civil Engineering Department at the University of Pittsburgh is currently conducting research on the mechanical properties of: (a) frozen sands, (b) fissured clays, and (c) particle assemblages. Material properties that need to be measured in each of these cases are the elastic moduli (Young's Modulus of Elasticity, E; the Shear Modulus, G; and the Poisson's Ratio, v). Several theoretical methods exist to calculate these moduli in composite materials and materials containing cracks. However, laboratory testing is required to establish whether these theoretical models do in fact apply to frozen soils, fissured clays and particle assemblages. The goal of this project is to request funding to purchase an Ultrasonic Velocity Testing Apparatus that measures the elastic moduli.