Computational modeling of constitutive behaviour of 3D printed composite structures

3D printing of a composite structure with shape memory materials requires a special approach to the subject, at the stage of the design and printing process. This paper presents the design steps during the development of a 3D-printed composite structure with shape memory material. The connection points between the SMA fibers and the printer filament are developed in the MATLAB environment. Finite element method is used to simulate the shortening of the shape memory material under the influence of temperature and its effect on the printed polymer material is presented. In the MATLAB environment, evolutionary algorithms were used to determine the shape of the SMA fiber alignment. This work demonstrates the use of shape memory effect in 3D printed smart composite structures, where the component takes a predetermined shape. The structure obtained as a result of such printing changes with the heat generated by the current voltage, making it the desired fourth dimension.

Download Full-text

Computational Modeling of 3D Printed Hepatic Spheroids Inside a Bioreactor

2018 25th National and 3rd International Iranian Conference on Biomedical Engineering (ICBME) ◽

10.1109/icbme.2018.8703541 ◽

2018 ◽

Author(s):

Sharifi Fatemeh ◽

Bahar Firoozabadi ◽

Keikhosrow Firoozbakhsh

Keyword(s):

Computational Modeling ◽

3D Printed

Download Full-text

POROSITY OF COMPOSITE STRUCTURES BASED ON 3D-PRINTED FRAMES IMPREGNATED WITH EPOXY RESIN

Tekhnicheskiy servis mashin ◽

10.22314/2618-8287-2021-59-1-131-139 ◽

2021 ◽

Vol 1 (142) ◽

pp. 131-139

Author(s):

Yuliya A. Lopatina ◽

◽

Vyacheslav A. Denisov

Keyword(s):

3D Printing ◽

Epoxy Resin ◽

Composite Structures ◽

Epoxy Resins ◽

Complex Shape ◽

Complex Geometry ◽

Research Purpose ◽

Second Stage ◽

3D Printed ◽

The Cost

In the designs of modern machines, more and more polymer parts are used, at the same time, there is a problem of their quick replacement in case of failure. Reducing the cost and repair time can be achieved by using 3D printing by FDM method, but such parts do not always demonstrate the necessary strength. To improve their mechanical properties, a method of their impregnation after printing in epoxy resins was previously proposed. (Research purpose) The research purpose is in studying the dependence of the porosity of composite structures based on 3D-printed frames impregnated with resin on the parameters of their manufacture. (Materials and methods) Authors used samples for the first stage of the work, which are 3D-printed cylinders with different wall thicknesses and internal geometries, impregnated with ED-20 epoxy resin. The samples were cut in several sections and the number of pores in these sections was calculated. The second stage of the experiment was to evaluate the porosity of a part of complex geometry. (Results and discussion) With an increase in the percentage of filling and thickening of the wall in 3D printing, there is a tendency to reduce the number of pores. With a less dense filling of the frame and a thinner wall, the resin is worse retained in the product and partially flows out after impregnation. The best filling of a part of a complex shape was observed when it was cured in the position of the massive part up. (Conclusions) For the production of high- quality composite parts based on 3D-printed frames impregnated with epoxy resin, it is recommended to choose the largest possible percentage of filling during 3D printing and strive to position the part during the curing process after impregnation with the massive part up.

Download Full-text

3D PRINTED CONTINUOUS FIBRE COMPOSITE RESEARCH AT DEAKIN UNIVERSITY: DESIGN AND ANALYSIS METHODS FOR UD, HYBRID AND PSEUDO-WOVEN PLY ARCHITECTURES

10.12783/asc36/35755 ◽

2021 ◽

Author(s):

MATHEW JOOSTEN ◽

ZI LI ◽

CHENG HUANG

Keyword(s):

Composite Laminates ◽

Composite Structures ◽

Mechanical Response ◽

Fibre Composite ◽

Analytical Models ◽

Thermoplastic Composites ◽

Continuous Fibre ◽

Research Activities ◽

Research Theme ◽

3D Printed

At Deakin University we have been researching the performance of continuous fibre 3D printed composite structures and a summary of three research activities related to this research theme are provided herein. 3D printed continuous fibre composites can be used to realise significant gains in stiffness and strength compared to an equivalent component fabricated using a neat thermoplastic. To investigate the performance of these materials both commercially available and customised printers were used to fabricate composite laminates and the behaviour of these laminates evaluated experimentally. Finite element and analytical models were used to predict the mechanical response. These approaches were originally developed for thermoset matrices, however, the models have shown to be capable of predicting the behaviour of 3D printed carbon fibre and hybrid carbon-fibreglass thermoplastic composites. These validated models can be used to generate design charts to identify feasible UD and semi-woven textile architectures, thereby, allowing designers to tailor the ply architecture and stacking sequence to meet specific design requirements.

Download Full-text

Bending Behavior of Sandwich Composite Structures of 3D-Printed Materials

Lecture Notes in Mechanical Engineering - Advances in Materials and Manufacturing Engineering ◽

10.1007/978-981-15-1307-7_31 ◽

2020 ◽

pp. 281-287

Author(s):

M. H. Ali ◽

Shaheidula Batai

Keyword(s):

Composite Structures ◽

Sandwich Composite ◽

3D Printed ◽

Bending Behavior ◽

Printed Materials

Download Full-text

Multi-scale finite element modeling of 3D printed structures subjected to mechanical loads

Rapid Prototyping Journal ◽

10.1108/rpj-05-2016-0074 ◽

2018 ◽

Vol 24 (1) ◽

pp. 177-187 ◽

Cited By ~ 7

Author(s):

Dalia Calneryte ◽

Rimantas Barauskas ◽

Daiva Milasiene ◽

Rytis Maskeliunas ◽

Audrius Neciunas ◽

...

Keyword(s):

Finite Element ◽

Composite Structures ◽

Computational Models ◽

Three Dimensional ◽

Structural Response ◽

Content Type ◽

Multi Scale ◽

Macro Scale ◽

Internal Constitution ◽

3D Printed

Purpose The purpose of this paper is to investigate the influence of geometrical microstructure of items obtained by applying a three-dimensional (3D) printing technology on their mechanical strength. Design/methodology/approach Three-dimensional printed items (3DPI) are composite structures of complex internal constitution. The buildup of the finite element (FE) computational models of 3DPI is based on a multi-scale approach. At the micro-scale, the FE models of representative volume elements corresponding to different additive layer heights and different thicknesses of extruded fibers are investigated to obtain the equivalent non-linear nominal stress–strain curves. The obtained results are used for the creation of macro-scale FE models, which enable to simulate the overall structural response of 3D printed samples subjected to tensile and bending loads. Findings The validation of the models was performed by comparing the computed results against the experimental ones, where satisfactory agreement has been demonstrated within a marked range of thicknesses of additive layers. Certain inadequacies between computed against experimental results were observed in cases of thinnest and thickest additive layers. The principle explanation of the reasons of inadequacies takes into account the poorer quality of mutual adhesion in case of very thin extruded fibers and too-early solidification effect. Originality/value Flexural and tensile experiments are simulated by FE models that are created with consideration to microstructure of 3D printed samples.

Download Full-text