Date of Award

8-2019

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

Committee Member

Garrett J Pataky, Committee Chair

Committee Member

Oliver J Myers

Committee Member

Hongseok Choi

Abstract

Carbon fiber reinforced polymers (CFRP) have been used in many high-performance applications where strength to weight ratio is an important characteristic. Recent manufacturing advancements have decreased the cost of creating CFRP. Industries such as the aerospace and automotive have begun to expand the use of CFRPs.

Tensile and fatigue experiments were conducted on angled unidirectional CFRP coupled with digital image correlation to analyze the full field displacement. The displacement fields were then used as inputs for regression analysis to determine the stress intensity factor range. Predicted displacement fields using the calculated stress intensity factor ranges were then compared to the experimental fields. It is common, in literature, to treat an angled crack in composites as a rotated horizontal crack because the fiber direction controls the crack path. In this study, the inclusion of the Mode II loading condition had a significant effect of the displacement fields. The inclusion of Mode II increased the agreement between predicted and experimental displacement fields around a crack tip. Regression analysis, crack growth rate analysis, and analytical stress intensity factor ranges were used to expand on the agreement.

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