All ETDs from UAB

Advisory Committee Chair

Selvum Pillay

Advisory Committee Members

Alejandra J Monsivais

Charles A Monroe

Haibin Ning

Document Type


Date of Award


Degree Name by School

Master of Science in Materials Engineering (MSMtE) School of Engineering


Composite materials, especially thermoplastics, are now used extensively in the automotive industry to replace metal components. Three different glass fiber reinforced thermoplastic composites were compared to obtain an equivalent performance of a steel leaf spring. Polyethylene Terephthalate Glycol (PETG), Polyamide 66 (PA 66) and Polyphenylene Sulfide (PPS) were the matrices considered for this research work. Mechanical testing (tensile, compressive, shear, flexural and moisture absorption) was performed to these three thermoplastic composites concluding that PPS is the best choice since it displayed the best overall properties. Once PPS was selected, a Design of Experiment (DOE), based on three level (3^k) factorial design, was conducted to define the best processing parameters and their effect on the flexural properties of glass fiber reinforced Polyphenylene Sulfide (GFR-PPS). Finally, a modification in the architecture of the fiber in the layup was made in ANSYS to define the best arrangement that could withstand not only vertical deflection but also lateral deflection. Two arrangements were simulated and five different fiber angle orientations (0°, 15°/-15°, 30°/-30°, 45°/-45° and 90°) were modeled. Keywords: thermoplastic, fiber, PPS, PETG, PA6/66, spring

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