Date of Award

2022-12-01

Degree Name

Master of Science

Department

Mechanical Engineering

Advisor(s)

Yirong Lin

Second Advisor

Tzu-Liang (Bill) Tseng

Abstract

This research will be divided into two sections. The first section discusses direct ink writing and thermomechanical characterization for thermoset composites. The thermoset ink is prepared with fillers aiding the printing process by modifying the rheology of the ink and geometry retention by allowing for the part to have an initial UV cure step. Three specimen formulations with different weight percentages were printed by material extrusion in the shape of tensile specimens following ASTM standard D638 to characterize the mechanical properties at room temperature, 100â?? and 200â??. Furthermore, the ink resin was characterized through DSC, TGA, and rheology testing. The second section will discuss the detection of intentional defects on both curved and planar carbon fiber composites through non-destructive evaluation (NDE) methods. The main NDE technique used is ultrasonic testing (UT) by using a phased array probe. Different planar and curved composites were produced by compression pressing and molded vacuum bagging. UT was used to detect defects such as delaminations and inclusions at different layers, locations, and sizes. The data acquired from the composite panels was utilized to train an AI model to detect the category of defects, location, and depth.

Language

en

Provenance

Received from ProQuest

File Size

46 p.

File Format

application/pdf

Rights Holder

Sergio Dante Favela

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