| Abstract Scope |
Rotating the load train within a mechanical load frame provides enables extreme in-situ testing during X-ray computed tomography (CT) scans. It also introduces substantial alignment challenges. CT reconstruction algorithms require rotation about an axis with minimal deviation or runout, a problem exacerbated by the dual rotation stages required by rotating load train systems. A careful mechanical design limits vertical and horizontal runout on a 10kN system is kept to less than one micron. A four degree of freedom fixture aligns the two axes to each other, which is particularly important for longer load trains, often needed to insulate the load cell and actuator from extreme sample temperature. A convective current environmental chamber capable of CT from -60C to 300C is discussed, as well as a 1600C furnace, whose novel control algorithm can control temperature to 0.1C. The rotating load train also facilitates laser heating to temperatures beyond 1600C. |