Healing simulation for bond strength prediction of FDM

Purpose The purpose of this paper is to present a diffusion-controlled healing model for predicting fused deposition modeling (FDM) bond strength between layers (z-axis strength). Design/methodology/approach Diffusion across layers of an FDM part was predicted based on a one-dimensional transient he...

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Bibliographic Details
Published in:Rapid prototyping journal 2017-01, Vol.23 (3), p.551-561
Main Authors: Coogan, Timothy J, Kazmer, David O
Format: Article
Language:English
Subjects:
Bonding strength
Butadiene
Diffusion coefficient
Diffusion layers
Dimensional analysis
Fused deposition modeling
Healing
Heat transfer
Interlayers
Material properties
Mechanical properties
Polymers
Process parameters
Rapid prototyping
Rheological properties
Rheology
Temperature
Temperature dependence
Wool
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Summary:Purpose The purpose of this paper is to present a diffusion-controlled healing model for predicting fused deposition modeling (FDM) bond strength between layers (z-axis strength). Design/methodology/approach Diffusion across layers of an FDM part was predicted based on a one-dimensional transient heat analysis of the interlayer interface using a temperature-dependent diffusion model determined from rheological data. Integrating the diffusion coefficient across the temperature history with respect to time provided the total diffusion used to predict the bond strength, which was compared to the measured bond strength of hollow acrylonitrile butadiene styr (ABS) boxes printed at various processing conditions. Findings The simulated bond strengths predicted the measured bond strengths with a coefficient of determination of 0.795. The total diffusion between FDM layers was shown to be a strong determinant of bond strength and can be similarly applied for other materials. Research limitations/implications Results and analysis from this paper should be used to accurately model and predict bond strength. Such models are useful for FDM part design and process control. Originality/value This paper is the first work that has predicted the amount of polymer diffusion that occurs across FDM layers during the printing process, using only rheological material properties and processing parameters.
ISSN:1355-2546
1758-7670
DOI:10.1108/RPJ-03-2016-0051