3D Print Lab

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School

Harrisburg Area Community College *

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Course

GTEC201

Subject

Mechanical Engineering

Date

Dec 6, 2023

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ENGINEERING 3D Print Lab Prepared by – Robert Bond Prepared for – Professor Lysinger 3D Print Lab – GTEC 104 – MET- HACC Date of Experiment 2023-04-19 Date of Submittal 2023-04-24

Summary: (a) Objective: The goal of this lab was to test the tensile strengths of different types of plastics that are commonly used in 3D printers. (b) Conclusions: Each plastic has different qualities that make it more or less attractive based on what the plastics are going to be used for. (c) Recommendations: N/A Results: A total of 11 3D printed specimens were tested and then the tensile strength of each specimen was tested. Specimen Plastic Type: Tensile Strength (lbs) Temp (f°) Amount of Elongation 1 ABS 209 Room Temp Some Elongation 2 ABS 209 Room Temp Some Elongation 3 PLA 387 Room Temp No Elongation 4 PLA 379 Room Temp No Elongation 5 PLA 434 Room Temp No Elongation 6 PETG 186.6 Room Temp No Elongation 7 PETG 121 Room Temp No Elongation 8 BLUE ABS 286 Room Temp Some Elongation 9 Warm PLA 328 95 No Elongation 10 Warm ABS 213 150 Significant Elongation 11 Warm ABS 191 150 Significant Elongation Figure 1. Table with Data Collected

Specimen Cross Sectional Area (in²) Tensile Strength (lbs) Shear Strength (psi) 1 0.0525 209 3980.95 2 0.0525 209 3980.95 3 0.0525 387 7371.43 4 0.0525 379 7219.05 5 0.0525 434 8266.67 6 0.0525 186.6 3554.29 7 0.0525 121 2304.76 8 0.0525 286 5447.62 9 0.0525 328 6247.62 10 0.0525 213 4057.14 11 0.0525 191 3638.09 Figure 2. Shear Strength Table For 3D Print Lab

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Figure 3. Picture of All 3D Print Lab Specimen

Discussion of Results: From the results it can be seen that different plastics handle tensile forces differently depending on the type of plastic. The PLA plastic showed the greatest tensile strength but showed almost no ductility. ABS showed a tensile strength between that of PLA and PETG and showed some ductility. PETG shows the least amount of tensile strength and almost no ductility. The Blue ABS plastic shows the same strength as non-colored ABS but has no ductility, this could be due to the fact that blue ABS specimen is significantly older and as plastic ages it becomes more brittle.. The warm ABS shows slightly less strength than the room temperature ABS but has significantly more ductility. The warm PLA only show slightly less tensile strength then the room temperature PLA but it should be taken into consideration that the PLA was only at 95 degrees Fahrenheit when it was tested and may have had all but full strength at that temperature. From the pictures only two specimens really show the orientation of the extrusion paths and those are the PETG specimens. The specimen whose extrusion paths are in line with the axial force of the experiment provided less strength then the ones whose extrusion paths did not line up. Sample Calculations: 𝜏 = 𝐹 𝐴 𝑠 Where τ is the shear stress in psi F is the greatest force exerted on the specimen A s is the cross-sectional area of the middle of each specimen. Equation 2 displays the calculations of shear stress with experimental values substituted into equation 1. This was repeated for each shear stress value for each specimen. τ = 350 𝑙𝑏𝑠 .0525 𝑖𝑛 2 = 666.67 psi

Appendices: (a) Original Data Sheet

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