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

该项目将购买设备，以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，以更换老化的模拟控制器。还将购买液压夹头夹具和标本对准夹具。该设备将使现有的设备能够用于金属的拉压疲劳试验，并将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度的多晶进行循环试验，以探索可控微结构对循环力学行为的影响。其他用途包括：(1)对双相不锈钢进行疲劳测试，这种双相材料比传统不锈钢具有更高的强度和耐腐蚀性；(2)对砂土和粘土等岩土材料进行受控测试；以及(3)对涂有机械沉积陶瓷粉末的试件进行测试，以评估涂层的附着力。

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.