Mechanisms of Microstructural Influences on Cyclic Plasticity and Ratchetting: Equipment Supplement

该项目将购买设备来升级克拉克森大学现有的单轴伺服液压材料测试系统。将购买专门为伺服液压材料测试系统设计的数字控制设备，以取代老化的模拟控制器。液压夹头和样品对准夹具也将购买。该设备将使现有设备能够用于金属的拉压疲劳测试，并有助于缓解克拉克森轴向扭转试验机的过度调度。该测试系统的主要用途是对镍等高层错能金属的单晶和不同晶粒尺寸的多晶进行循环测试，研究可控微观结构对循环力学行为的影响。其他用途的例子包括：(1)对双相不锈钢进行疲劳测试，双相不锈钢是一种比传统不锈钢具有更高强度和耐腐蚀性的双相材料，(2)对砂土和粘土等岩土材料进行受控测试，以及(3)对机械沉积陶瓷粉末涂层的试样进行测试，以评估涂层的粘附性能。

This project will purchase equipment to upgrade an existing uniaxial servo-hydraulic materials testing system at Clarkson Unversity. Digital control equipment specifically designed for servo-hydraulic materials testing systems will be purchased to replace aging analug controllers. Hydraulic collet grips and a speciman alignment fixture will also be purchased. This equpiment will enable the existing equipment to be used for tension-compression fatigue testing of metals, and will help to alleviate over-scheduling of Clarkson's axial-torsional testing machine. The primary use for this testing system will be to conduct cyclic tests on single crystals and vrious grain size polycrystals of high stacking fault energy metals such as nickel, in research to explore the effect of controllable microstructure on cyclic mechanical behavior. Examples of other uses will be : (1) to conduct fatigue testing of duplex stainless steel - a dual phase material exhibiting higher strength and corrosion resistance than conventional stainless steels, (2) to conduct controlled tests on geotechnical material such as sandy soils and clays and (3)to conduct tests on specimens coated with mechanically deposited ceramic powders to assess coating adhesion properties.