- Title
- Tensile strength of partially filled FFF printed parts: meta modelling
- Creator
- Mahmood, Shahrain; Qureshi, A. J.; Goh, Kheng Lim; Talamona, Didier
- Relation
- Rapid Prototyping Journal Vol. 23, Issue 3, p. 524-533
- Publisher Link
- http://dx.doi.org/10.1108/RPJ-10-2015-0151
- Publisher
- Emerald
- Resource Type
- journal article
- Date
- 2017
- Description
- Purpose: This paper aims to investigate the tensile strength of partially filled fused filament fabrication (FFF) printed parts with respect of cross-sectional geometry of partially filled test pieces. It was reported in the authors’ earlier work that the ultimate tensile strength (UTS) is inversely proportional to the cross-sectional area of a specimen, whereas the number of shells and infill density are directly proportional to the UTS with all other parameters being held constant. Here, the authors present an in-depth evaluation of the phenomenon and a parametric model that can provide useful estimates of the UTS of the printed part by accounting for the dimensions of the solid floor/roof layers, shells and infills. Design/methodology/approach: It was found that partially filled FFF printed parts consist of hollow sections. Because of these voids, the conventional method of determining the UTS via the gross cross-sectional area given by A = b × h, where b and h are the width and thickness of the printed part, respectively, cannot be used. A mathematical model of a more accurate representation of the cross-sectional area of a partially filled part was formulated. Additionally, the model was extended to predict the dimensions as well as the lateral distortion of the respective features within a printed part using input values from the experimental data. Findings: The result from this investigation shows that to calculate the UTS of a partially filled FFF part, the calculation based on the conventional approach is not sufficient. A new meta-model is proposed which takes into account the geometry of the internal features to give an estimate of the strength of a partially filled printed part that is closer to the value of the strength of the material that is used for fabricating the part. Originality/value: This paper investigates the tensile strength of a partially filled FFF printed part. The results have shown that the tensile strength of a partially filled part can be similar to that of a solid part, at a lower cost: shorter printing time and lower material usage. By taking into account the geometries within a printed part, the cross-sectional area can be accurately represented. The mathematical model which was developed would aid end-users to predict the tensile strength for a given set of input values of the process parameters.
- Subject
- tensile strength; fused filament fabrication; additive manufacturing; meta modelling
- Identifier
- http://hdl.handle.net/1959.13/1391804
- Identifier
- uon:33296
- Identifier
- ISSN:1355-2546
- Language
- eng
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