Our project is a mechanism capable of testing the tensile properties of FFF-produced dogbone samples of Stratasys ABSplus-P430. This mechanism will be used to assess the anisotropic tendency of FFF-produced parts, a key factor guiding their design and manufacture. To that end, samples will be produced in accordance with ASTM D638, and printed in the configurations pictured below. These samples will then be elongated (also IAW ASTM D638) until fracture, and data regarding force and elongation will be recorded. Please note that our intent is not to imitate the Instron device referenced within, but rather to produce our own device capable of facilitating tensile testing of polymers for the UC Berkeley Mechanical Engineering student body.

The primary focus of this project will be on effective selection of materials and processes for the mechanism's key subsystems: the gripper, frame, and transmission. Additionally, our team will need to apply knowledge in the following areas:

• statics
• linkage design
• PID control
• mechatronics
• sensor characterization & calibration
• experiment design

Final Report