Unprecedented sensing of interlayer defects in three-dimensionally printed polymer by capacitance measurement

  title={Unprecedented sensing of interlayer defects in three-dimensionally printed polymer by capacitance measurement},
  author={Patatri Chakraborty and Guanglei Zhao and Chi Zhou and D. D. L. Chung},
  journal={Smart Materials and Structures},
Interlayer defects in a three-dimensionally (3D) printed structure are expected from the residual stress and commonly observed warpage, but their detection has been challenging and elusive. They are to be distinguished from intralayer defects (e.g., discernible voids), which can be quite easily detected. Interlayer defects in the form of local inadequate interlayer bonding in a 3D-printed polymer structure have been unprecedentedly shown in this work to be detectible by capacitance measurement… 
7 Citations

Revealing interactions of layered polymeric materials at solid-liquid interface for building solvent compatibility charts for 3D printing applications

It is shown that the overall stability and the mode of destruction depend on chemical properties of the polymer and the nature of interactions at the solid-liquid interface, which depends on the layered microstructure of the sample, which is defined by 3D printing parameters.

Capacitance measurements on integrated conductors for detection of matrix cracks in GFRP

For the reliable and cost-efficient application of glass fibre polymer composites in structural applications, knowledge of the damage state of the material during operation is necessary. Within this

Region-based online flaw detection of 3D printing via fringe projection

A novel online monitoring technique based on a fringe projector to keep the stability of the process under control on a layer-by-layer basis and a region-based defect detection method that takes each subregion, instead of each point, as a detection unit.

Unprecedented Capacitance-Based Nondestructive Evaluation of Steels

  • K. ShiD. Chung
  • Materials Science
    Journal of Materials Engineering and Performance
  • 2019
This work reports for the first time capacitance-based nondestructive evaluation (NDE) of a monolithic metal, namely steel. This means that the structural material is self-sensing, without the need



Piezoelectric behavior of three-dimensionally printed acrylate polymer without filler or poling

We report the piezoelectric behavior of three-dimensionally layer-by-layer printed (bottom-up stereolithography, 21–46-µm layer thickness) polymer without filler or poling, using unmodified

Decreasing the shear stress-induced in-plane molecular alignment by unprecedented stereolithographic delay in three-dimensional printing

AbstractThe shear stress-induced in-plane molecular alignment in 3D printed polymer is decreased with an increased stereolithographic delay. The molecular alignment represented by the

Capacitance-based defect detection and defect location determination for cement-based material

This paper provides the first report of capacitance-based nondestructive cement-based material defect detection. It is based on the use of the fringing electric field (2 kHz) of a capacitor that

Improvement of quality of 3D printed objects by elimination of microscopic structural defects in fused deposition modeling

It was shown that the wall permeability of a printed object depends on its geometric shape and is gradually reduced in a following series and it was demonstrated that high quality of 3D printed objects can be achieved using routinely available printers and standard filaments.

Frontal Conversion and Uniformity in 3D Printing by Photopolymerisation

A simple framework and model, based on directly measured parameters, can be employed in photopolymerisation-based 3D printing, both in process optimisation and in the precise design of complex, internally stratified materials by coupling the z-stage displacement and frontal polymerisation kinetics.

3D printing of an interpenetrating network hydrogel material with tunable viscoelastic properties.