Design of a Test Stand to Measure the Shear Strength of Polymers at Elevated Temperatures

Photo of Ryan Cheng, Jae-Ho Song, and Zachary Ullah Students: Ryan Cheng, Jae-Ho Song, and Zachary Ullah

Sponsor: Schlumberger

Date: Spring 2012

Requirements:
The functional die must accept varying diameters from 3" to 10". Also, the design should minimize the number of functional rings being tested to save money. This was realized by shearing only portions of the functional ring. Schlumberger emphasized time and safety as constraints.

Problem:
Schlumberger designs various sensors and electronics to assess geological formations for petroleum production. A combination of O-rings and functional rings is used to seal the the enclosures and prevent liquids from contacting the sensors or electronic equipment. A previous design team gathered shear strength data for O-rings and thin disks, made of the material for the functional rings, using a modified test stand. For this project, the team was tasked with improving and validating the test stand, including designing a die that shears functional rings, gathering results for thin disks and functional rings to compare, and automating the test stand to be operable by a single user.

Solution:
The team designed and created a die that shears functional rings. Four experiments were set up.The first two experiments tested repeatability and speed. The third experiment sheared thin disks, while the last experiment sheared functional rings. The team delivered the improved test stand along with the newly added pump, cylinder, load cell, h-bridge speed controller, and a user manual to work the test stand. All the SolidWorks drawings for improvements and newly designed parts were provided. Finally, the LabVIEW program for running the test stand was provided to the sponsor.

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Photo related to Design of a Test Stand to Measure the Shear Strength of Polymers at Elevated Temperatures project
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