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A Novel Approach to Increase Dynamic Fracture Toughness of Additively Manufactured Polymer
- Source :
- Experimental Mechanics. 59:899-911
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- An experimental study is performed to investigate the dynamic fracture of additive manufactured Acrylonitrile Butadiene Styrene (ABS). A single edge notched bending (SENB) specimen with three orientations, namely horizontal builds with 45°/−45° (H45), 0°/90° (H90) raster orientations, and vertical builds with layers perpendicular to the pre-crack (V0) are considered for this study. In addition, a novel toughening mechanism is explored by changing the surface topology to deflect the crack paths. A modified split Hopkinson pressure bar with a copper pulse shaper (to increase the raising time of incident loading pulse) is used to conduct a three-point bend impact experiment to characterize the dynamic fracture initiation toughness and crack dynamics of 3D printed specimens. Real-time crack initiation and propagation is captured by using a high-speed video camera. Using the load history diagram, accurate fracture initiation load is found to determine dynamic fracture initiation toughness. Fracture initiation toughness is increased by 138% for a V0 specimen configuration compared to H90. Three different sized circular patterns (with diameters of 1, 1.75 and 2.5 mm) and a square pattern (with a length of 1.53 mm) are considered to observe the effect of surface topology on the dynamic fracture initiation toughness. Introducing surface pattern to the specimen increases the fracture toughness by 58% as compared to specimens without surface pattern. Surface pattern also exhibits two steps of crack growth and decreases the initial crack propagation velocity significantly for all three orientations. Additionally, higher fracture initiation toughness is achieved with the increase in the size of the pattern and the change of the pattern shape.
- Subjects :
- Toughness
Materials science
Acrylonitrile butadiene styrene
Mechanical Engineering
Aerospace Engineering
Fracture mechanics
02 engineering and technology
Split-Hopkinson pressure bar
Bending
Edge (geometry)
021001 nanoscience & nanotechnology
chemistry.chemical_compound
020303 mechanical engineering & transports
Fracture toughness
0203 mechanical engineering
chemistry
Mechanics of Materials
Fracture (geology)
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 17412765 and 00144851
- Volume :
- 59
- Database :
- OpenAIRE
- Journal :
- Experimental Mechanics
- Accession number :
- edsair.doi...........993bde5df00d869ccd98301f55a1fc0d