Foundational Investigation on the Characterization of Porosity and Fiber Orientation Using XCT in Large-Scale Extrusion Additive Manufacturing

被引:8
作者
Tagscherer, Nevine [1 ,2 ]
Schromm, Thomas [3 ]
Drechsler, Klaus [1 ]
机构
[1] Tech Univ Munich, TUM Sch Engn & Design, Dept Mech Engn, Chair Carbon Composites, Boltzmannstr 15, D-85748 Garching, Germany
[2] New Technol & China, BMW Grp, Petuelring 130, D-80788 Munich, Germany
[3] Tech Univ Munich, TUM Sch Engn & Design, Dept Mech Engn, Chair Nondestruct Testing, Franz Langinger Str 10, D-81245 Munich, Germany
关键词
Additive Manufacturing (AM); digital manufacturing; void analysis; X-ray Computed Tomography (XCT); mechanical properties; fiber orientation; composites; MECHANICAL-PROPERTIES; CARBON-FIBER; COMPOSITES; PARTS; DESIGN;
D O I
10.3390/ma15062290
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The great potential of Extrusion Additive Manufacturing (EAM) for structural prototyping in the automotive industry is severely limited by the directional bias in the build direction. The layerwise fabrication leads to reduced mechanical properties at the layer-to-layer interface compared to the bulk of the strand. Especially for the often-used semi-crystalline thermoplastics, the mechanical properties strongly depend on the processing parameters, even more so if short fibers are used as fillers. Therefore, ideal processing windows in which the mechanical strength and modulus in the z-direction reach their maximum can be identified for these parameters, resulting in a reduced directional bias. The influence of the EAM processing parameters on mechanical strength has already been investigated, correlating strength with thermal conditions during printing. However, these considerations did not distinguish between the thermal effect on the polymer properties, the formation of voids and pores at the layer interface, and the resulting fiber orientation for different strand proportions. Therefore, in this study, the effect of different processing temperatures and layer heights on the pore size and distribution, as well as the fiber orientation in the different regions of the mesostructure was investigated using X-ray Computed Tomography (XCT).
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页数:12
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