| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Polymeric-based Materials: Potentials and Challenges
|
| Presentation Title |
Anisotropy and Porosity in 3D Printed Carbon Fiber-PLA Composites Measured Using Ultrasonic Testing |
| Author(s) |
Dillon Shen, Zebadiah Miles, Daniel Santos Gualoto Condor, Carl Boehlert, Sunil Chakrapani |
| On-Site Speaker (Planned) |
Sunil Chakrapani |
| Abstract Scope |
Recent advances has allowed us to 3D print Carbon fiber-PLA composites using fused deposition modeling (FDM) printers. This article focuses on two aspects: (a) anisotropy and (b) porosity in the short fiber, 3D printed composites. To measure the Cij elastic constants, we utilize ultrasonic velocity, which is a combination of stiffness and density and has been previously used to measure the anisotropic elastic constants and porosity content. Assuming orthotropy, we measure the 9 elastic constants. To validate, we have further rotated the build direction and used the composite rotation theory to compare the measured and predicted elastic constants. Finally, destructive analysis was carried out to measure the fiber, matrix and void volume fractions. The voids were elongated and found mainly at the fiber/matrix interface. The void theory was used to determine the reduction in stiffness and compared against the elastic constants measured using ultrasonic testing. |