Final Design

FINAL DESIGN OVERVIEW:

The Adaptive Torsion Test Device will convert  the vertical motion created by the Instron stress test device and apply a torque on test samples. The design aspect of the device came with its own unique set of challenges.

The device will ultimately serve as measurement instrumentation. The force applied and the deflection angle are crucial bits of information that we must be able to collect accurately. Roller bearings were used at critical points to mitigate frictional losses. Extreme precaution was taken in the fabrication process to ensure quality and effectiveness of the torsion device. A36 hot rolled steel was used for all the the frame parts. Threaded rods inserted at the bottom plate and at the rack were installed, theaw threads will allow for turnkey switch out of Instron adapter component so that it can be used on both the 50kN and 500N machines. 

Figure 1: Overview Final Design:

Figure 2: Key Features of the Device.

Ball Bearings: Reduce friction of the overall system. the  goal is  to preserve most of the downward force applied by the instron tester and convert to a torque.

Mod 5 Rack: Exceptional surface strength of 181 Nm. 300 mm in length for max rotation of 172 degrees.

Instron Adaption: Interchangeable between the 500 N  and the 30 KN machine.

Knobs: Added for easy height adjustments  and to make sure device is level.

Brass Bearings: Keep the rack aligned.

Figure 3: Device loaded on 30 KN Instron machine.

Figure 4: Device in action , Aluminum sample loaded into the grips.

Final Designed: Utilized Solidworks to create model.