Session: 03-03-04: Annual Congress-Wide Symposium on Additive Manufacturing IV

Paper Number: 173137

Impact Absorption Properties Comparison Using Shpb of Different Lattice Structures of 3d Printed Specimen 

Additive manufacturing is challenging the traditional way of making parts as well as a complete machine and offers tremendous opportunity in realizing complex custom designs which are very difficult to manufacture using traditional methods. Nowadays, 3D-printed components are used in day-to-day household items as well as in mission-critical components such as in space exploration machines and aerospace ships. When used in different applications as in vehicle, airplane, space ships as well as in sport and work helmets, some 3D-printed components will be subjected to high-impact loading and it is important that these components will have significant load-absorption capability having high modulus of toughness while maintaining high strength. The lattice-structure design as well as the material used to make these 3D-printed components are believed to predominantly determine their load-absorption capabilities and strength. An nTop engineering design, a 3D computational modeling software, is used to design different lattice-structures of several 3D-printed small pallets and dog-bone shaped specimens, for impact and static loading testing, respectively. Three different materials, namely: Polylactic Acid (PLA), Polyethylene Terephthalate Glycol (PETG), and Acrylonitrile Butadiene Styrene (ABS) are used to make variety of specimen with varying lattice structure design and infilling percentage. Triangular, Square, hexagonal, and Gyroid honeycomb geometries are considered as building units to the lattice structural design. Specimens are tested using an in-house built Split Hopkinson Pressure Bar (SHPB) for their impact properties while a commercial Tensile Testing machine is used to measure their static properties. The SHPB testing system is designed and built by Senior Design students as their capstone design project. Half-bridge Strain gages attached to the incident and transmission bars of the SHPB are used to collect the wave propagation data during impact and a high-speed Strain Gauge Signal Conditioner as well as data acquisition (DAQ) device, and corresponding software are used to collect and transfer data to a computer. Collected data is analyzed using an open-source Split Hopkinson Pressure Bar graphical data analysis tool called “SHPB Analysis Tool”, developed by The Center for Advanced Vehicular Systems of Mississippi State University. The impact absorption abilities and static properties of the specimens made of the listed materials with six different lattice structure designs and infills of 30%, 35%, 40%, 45% and 50% are compared and conclusions are drawn. Based on the results and conclusion, best combinations are proposed. This research will contribute to designing best combination of optimal lattice structures, material properties and infills for better impact absorption capabilities.

Presenting Author: Fernando Anguiano West Texas A&M University

Presenting Author Biography: Fernando is Dr. Fisseha Meresa Alemayehu, associate professor of Mechanical Engineering at the College of Engineering of West Texas A&M University, undergraduate research student.

Authors:

Fisseha Alemayehu N/A
Fernando Anguiano West Texas A&M University
Sanjoy Bhattacharia West Texas A&M University
Joshua Partheepan West Texas A&M University