Project Team
Students
Jack Becker
Aerospace Engineering
Penn State Altoona, University Park
Faculty Mentors
Dr. Md Fazlay Rabbi
Penn State Altoona
Mechanical Engineering
Dr. Sheikh Fahad Ferdous
Penn State Harrisburg
Mechanical Engineering
Project
Project Video
Project Abstract
This study aims to find the effect that extrusion temperature and layer heights have on the tensile and shear properties of additively manufactured carbon fiber reinforced nylon. Dogbone shape was used for the tensile composites and a double v notch shape was used for the shear composites. Both specimens were tested at 3 different printing temperatures (240℃, 260℃, and 280℃) and also 3 different layer heights (0.25mm, 0.3mm, and 0.35mm). Tests were performed using an universal testing machine while a digital image correlation (DIC) was completed to find the strain values of the specimens. It was found that initial increase in printing temperature improves the tensile and shear strength by 14.05% and 27.55% respectively due to increased molecular diffusion, intermolecular bonding, and larger neck growth. However, further increases in temperature causes a decrease in all properties, with a drop in tensile strength of 12.37%, a decrease in shear strength of 4.55%, 15.09% decrease in tensile modulus, and a decrease in shear modulus of 12.75% due to polymer degradation and chain scission of the polymer. For layer heights, a steady decrease in properties was observed when increasing the layer height because of a smaller bond area and less neck formation between layers from the more spherical cross section of the higher layer heights. In tensile strength, a decrease of up to 35.93% was observed, while a decrease of up to 15.6% was found for shear strength. The modulus had similar results, with a 27.64% decrease in tensile modulus, and a decrease of 19.53% in the shear modulus.
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