Department of Engineering Technology

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Browsing Department of Engineering Technology by Subject "3D printing"

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    Robot Arm Interface with Microcontroller
    (2020-05-07) Miles, Koty; Montalvo-Hernandez, Carlos; Ku, Derek; Freije, Elizabeth
    To fulfill the needs of an advanced ECET microcontroller programming class, two robot arms are to be created for the students. These robot arms will have six degrees of freedom, interface with a microcontroller, and be controlled wirelessly with an Android application via Bluetooth. Once the robots are 3D printed and assembled, three new labs will be created and tested which will integrate these robot arms into the class. The first lab will be an introduction to servo motors and the robot arm, the second will include an ultrasonic sensor which will communicate with the robot, and the third will have two robots communicate with each other as well as a single Bluetooth device. An overview of the design of these robots is included in this document including the scope, decision matrices, schematic, design layout, test plan, bill of materials (BOM), assembly instructions, and user manual. The outcome of this project is crucial so that students will be able to have a user-friendly platform that allows them to practice and teach them how to properly program microcontrollers that will control these robots.
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    Tensile, Creep, and Fatigue Behaviors of 3D-Printed Acrylonitrile Butadiene Styrene
    (Springer, 2018-01) Zhang, Hanyin; Cai, Linlin; Golub, Michael; Zhang, Yi; Yang, Xuehui; Schlarman, Kate; Zhang, Jing; Engineering Technology, School of Engineering and Technology
    Acrylonitrile butadiene styrene (ABS) is a widely used thermoplastics in 3D printing. However, there is a lack of thorough investigation of the mechanical properties of 3D-printed ABS components, including orientation-dependent tensile strength and creep fatigue properties. In this work, a systematic characterization is conducted on the mechanical properties of 3D-printed ABS components. Specifically, the effect of printing orientation on the tensile and creep properties is investigated. The results show that, in tensile tests, the 0° printing orientation has the highest Young’s modulus of 1.81 GPa, and ultimate strength of 224 MPa. In the creep test, the 90° printing orientation has the lowest k value of 0.2 in the plastics creep model, suggesting 90° is the most creep resistant direction. In the fatigue test, the average cycle number under load of 30 N is 3796 cycles. The average cycle number decreases to 128 cycles when the load is 60 N. Using the Paris law, with an estimated crack size of 0.75 mm, and stress intensity factor is varied from 352 to 700