The Effect of Joint Roughness on Shear Behavior of 3D-Printed Samples Containing a Non-Persistent Joint

2021 ◽  
Vol 62 (5) ◽  
pp. 553-563
Author(s):  
Jae-Joon Song ◽  
◽  
Jineon Kim ◽  
Sayedalireza Fereshtenejad ◽  
◽  
...  
Keyword(s):  
Shear Strength ◽  
3D Printing ◽  
Normal Stress ◽  
Type A ◽  
Shear Behavior ◽  
Experimental Results ◽  
Type B ◽  
Joint Roughness ◽  
3D Printing Technology ◽  
3D Printed

The goal of this paper is to study the applicability of 3D printing technology to assess the effect of joint roughness on the shear strength of weakness planes with non-persistent discontinuities. Three disc-shaped profiles were generated to make joints with low, intermediate, and high levels of roughness. Powder-based 3D printing technology was applied to provide two types of samples: Type-A samples (joint samples) and Type-B samples (samples with a non-persistent joint). Type-A samples were printed to assess the shear behavior of 3D-printed joints, and Type-B samples were printed to investigate the joint roughness and rock bridge cohesion contributions to the shear strength of partially discontinuous planes. For comparison purposes, several plaster samples containing a non-persistent joint were cast as well. Three series of direct shear experiments were performed on Type-A, Type-B, and plaster samples under constant normal load conditions. The effects of two parameters, namely normal stress and joint roughness, on the shear behavior of the 3D-printed specimens were separately investigated, and the interaction between them was analyzed. The evaluation of the experimental results indicates the existence of two-way interaction between the joint roughness and the applied normal stress of Type-B samples. The experimental results obtained from plaster samples were compared with those obtained from Type-B samples. The comparison reveals that 3D-printed samples properly reflect the effects of joint roughness and normal stress on the shear strength of partially discontinuous planes, although their prepeak and post-peak behaviors are different from those of plaster specimens.

scholarly journals TACTILE MAPS BASED ON 3D PRINTING TECHNOLOGY

2015 ◽  
Vol 3 ◽  
pp. 193
Author(s):  
Vít Voženílek ◽  
Alena Vondráková
Keyword(s):  
3D Printing ◽  
Type A ◽  
Present Situation ◽  
Type B ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Inverse Form ◽  
New Type ◽  
Type C ◽  
Tactile Maps

The authors present the research seeking evaluating and developing aspects of interpretation and perception of geospace by modern tactile maps based on 3D printing. There are three newly introduced types of tactile maps. Map of type A is a tactile map printed by 3D printing technology as traditional relief tactile map with 5 mm thick background using both positive and negative relief with labelling by Braille letters. Map of type B is an inverse form of tactile map printed by 3D printing technology which will be used for casting type A tactile maps. Finally map of type C is a sound tactile map derived from map of type A posed onto box with digital voice records of geoinformation (attributes, navigations etc.) activated by touch on maps surface. The paper also describes present situation in tactile maps production and steps in recent testing the new type maps.

scholarly journals A millifluidic chip for cultivation of fish embryos and toxicity testing fabricated by 3D printing technology

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20507-20518
Author(s):  
Petr Panuška ◽  
Zuzana Nejedlá ◽  
Jiří Smejkal ◽  
Petr Aubrecht ◽  
Michaela Liegertová ◽  
...  
Keyword(s):  
3D Printing ◽  
Toxicity Testing ◽  
Toxicity Screening ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Fish Embryos ◽  
3D Printed ◽  
Novel Design

A novel design of 3D printed zebrafish millifluidic system for embryonic long-term cultivation and toxicity screening has been developed. The chip unit provides 24 cultivation chambers and a selective individual embryo removal functionality.

scholarly journals 3D-Printed Nanocellulose-Based Cushioning–Antibacterial Dual-Function Food Packaging Aerogel

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3543
Author(s):  
Wei Zhou ◽  
Jiawei Fang ◽  
Shuwei Tang ◽  
Zhengguo Wu ◽  
Xiaoying Wang
Keyword(s):  
3D Printing ◽  
Food Packaging ◽  
Fruits And Vegetables ◽  
Antibacterial Effect ◽  
Dual Function ◽  
Printing Technology ◽  
E Coli ◽  
3D Printing Technology ◽  
The Core ◽  
3D Printed

Cushioning and antibacterial packaging are the requirements of the storage and transportation of fruits and vegetables, which are essential for reducing the irreversible quality loss during the process. Herein, the composite of carboxymethyl nanocellulose, glycerin, and acrylamide derivatives acted as the shell and chitosan/AgNPs were immobilized in the core by using coaxial 3D-printing technology. Thus, the 3D-printed cushioning–antibacterial dual-function packaging aerogel with a shell–core structure (CNGA/C–AgNPs) was obtained. The CNGA/C–AgNPs packaging aerogel had good cushioning and resilience performance, and the average compression resilience rate was more than 90%. Although AgNPs was slowly released, CNGA/C–AgNPs packaging aerogel had an obvious antibacterial effect on E. coli and S. aureus. Moreover, the CNGA/C–AgNPs packaging aerogel was biodegradable. Due to the customization capabilities of 3D-printing technology, the prepared packaging aerogel can be adapted to more application scenarios by accurately designing and regulating the microstructure of aerogels, which provides a new idea for the development of food intelligent packaging.

APPLICATION OF 3D PRINTING TECHNOLOGY FOR RAPID TOOLING IN SHEET METAL FORMING

2020 ◽  
Vol 3 ◽  
pp. 20-30
Author(s):  
M.A. SEREZHKIN ◽  
D.O. KLIMYUK ◽  
A.I. PLOKHIKH
Keyword(s):  
3D Printing ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Rapid Tooling ◽  
Printing Technology ◽  
3D Printing Technology ◽  
3D Printed ◽  
Printed Materials ◽  
Printing Parameters

The article presents the study of the application of 3D printing technology for rapid tooling in sheet metal forming for custom or small–lot manufacturing. The main issue of the usage of 3D printing technology for die tooling was discovered. It is proposed to use the method of mathematical modelling to investigate how the printing parameters affect the compressive strength of FDM 3D–printed parts. Using expert research methods, the printing parameters most strongly affecting the strength of products were identified for further experiments. A method for testing the strength of 3D–printed materials has been developed and tested.

scholarly journals Implementation of 3D Printing Technology in the Food Industry

2021 ◽  
pp. 50-54
Author(s):  
Nor Aiman Sukindar ◽  
Noorazizi Mohd Samsuddin ◽  
Sharifah Imihezri Bt. Syed Shaharuddin ◽  
Shafie Kamaruddin ◽  
Ahmad Zahirani Ahmad Azhar ◽  
...  
Keyword(s):  
3D Printing ◽  
New Product Development ◽  
Food Industry ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Fabrication Cost ◽  
Food Packages ◽  
3D Printed ◽  
The Cost ◽  
Fabrication Time

This project involves the implementation of 3D printing technology on designing and fabricating food holders in the food industry. Food holders are designed to hold the food packages in the filling line for food manufacturing industries that apply retort technology. Therefore, this study aims to implement the 3D printing technology in particular FDM to fabricate food holders for the food processing industry. The approach of using this technology is focused on giving more view on the capability of 3D printing technology, aiming at reducing the overall process fabrication cost and fabrication time. Hence, the fabrication cost and time between FDM and conventional machining methods were compared. This study revealed that Organic Gain food industry was able to reduce the cost and fabrication time for the food holder up to approximately 96.3% and 72% respectively. This project gives an insight into the ability of 3D printing technology in delivering the demands of the industry in producing parts as well as the adaptability of the technology to the industry in new product development. The project was carried out successfully and the 3D printed food holder has been tested and functions smoothly.

scholarly journals Promising Applications of Additive-Manufactured (3D-printed) Electrochemical Sensors for Forensic Chemistry

2021 ◽  
Author(s):  
Sílvia Castro ◽  
Raquel Rocha ◽  
Afonso João ◽  
Eduardo Richter ◽  
Rodrigo Munoz
Keyword(s):  
3D Printing ◽  
Illicit Drugs ◽  
Industrial Revolution ◽  
Electrochemical Sensors ◽  
Forensic Chemistry ◽  
Recent Contribution ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Wide Range ◽  
3D Printed

Additive-manufacturing is one of the major pillars of the new industrial revolution and the three-dimensional (3D) printing technology has been highlighted in this scenario. Among the many areas benefited by 3D-printing, the development of electrochemical sensors has appeared in evidence in the last years. One potential application of 3D-printed electrochemical sensors is devoted to forensic chemistry, which demands for portable analytical methods that can provide on-site measurements and thus bring a relevant information in loco. In this context, this review highlights the recent contribution of 3D-printing technology on the development of electrochemical sensors with great promises for on-site analysis in “real-world” forensic scenarios. From the detection of trace explosives, gunshot residues, illicit drugs and chemical threats, to the measurement of adulterants in food and fuels, we show the wide range of applications that 3D-printed electrochemical sensors have been proposed and future demands that can be addressed by such a powerful, affordable, and accessible tool.

A physical investigation of dimensional and mechanical characteristics of 3D printed nut and bolt for industrial applications

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ramesh Chand ◽  
Vishal S. Sharma ◽  
Rajeev Trehan ◽  
Munish Kumar Gupta
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
3D Printing ◽  
Surface Properties ◽  
3D Printer ◽  
Content Type ◽  
Safety Issues ◽  
Machine Failure ◽  
Sharp Edges ◽  
3D Printed

Purpose A nut bolt joint is a primary device that connects mechanical components. The vibrations cause bolted joints to self-loosen. Created by motors and engines, leading to machine failure, and there may be severe safety issues. All the safety issues and self-loosen are directly and indirectly the functions of the accuracy and precision of the fabricated nut and bolt. Recent advancements in three-dimensional (3D) printing technologies now allow for the production of intricate components. These may be used technologies such as 3D printed bolts to create fasteners. This paper aims to investigate dimensional precision, surface properties, mechanical properties and scanning electron microscope (SEM) of the component fabricated using a multi-jet 3D printer. Design/methodology/approach Multi-jet-based 3D printed nut-bolt is evaluated in this paper. More specifically, liquid polymer-based nut-bolt is fabricated in sections 1, 2 and 3 of the base plate. Five nuts and bolts are fabricated in these three sections. Findings Dimensional inquiry (bolt dimension, general dimensions’ density and surface roughness) and mechanical testing (shear strength of nut and bolt) were carried out throughout the study. According to the ISO 2768 requirements for the General Tolerances Grade, the nut and bolt’s dimensional examination (variation in bolt dimension, general dimensions) is within the tolerance grades. As a result, the multi-jet 3D printing (MJP)-based 3D printer described above may be used for commercial production. In terms of mechanical qualities, when the component placement moves from Sections 1 to 3, the density of the manufactured part decreases by 0.292% (percent) and the shear strength of the nut and bolt decreases by 30%. According to the SEM examination, the density of the River markings, sharp edges, holes and sharp edges increased from Sections 1 to 3, which supports the findings mentioned above. Originality/value Hence, this work enlightens the aspects causing time lag during the 3D printing in MJP. It causes variation in the dimensional deviation, surface properties and mechanical properties of the fabricated part, which needs to be explored.

Investigation of three-dimensional printing materials for printing aorta model replicating Type B aortic dissection

2021 ◽  
Vol 17 ◽  
Author(s):  
Chia-An Wu ◽  
Andrew Squelch ◽  
Zhonghua Sun
Keyword(s):  
3D Printing ◽  
Aortic Dissection ◽  
Three Dimensional ◽  
Ct Images ◽  
Patient Specific ◽  
Type B ◽  
Type B Aortic Dissection ◽  
Ct Attenuation ◽  
Significant Difference ◽  
3D Printed

Aim: To determine a printing material that has both elastic property and radiology equivalence close to real aorta for simulation of endovascular stent graft repair of aortic dissection. Background: With the rapid development of three-dimensional (3D) printing technology, a patient-specific 3D printed model is able to help surgeons to make better treatment plan for Type B aortic dissection patients. However, the radiological properties of most 3D printing materials have not been well characterized. This study aims to investigate the appropriate materials for printing human aorta with mechanical and radiological properties similar to the real aortic computed tomography (CT) attenuation. Objective: Quantitative assessment of CT attenuation of different materials used in 3D printed models of aortic dissection for developing patient-specific 3D printed aorta models to simulate type B aortic dissection. Method: A 25-mm length of aorta model was segmented from a patient’s image dataset with diagnosis of type B aortic dissection. Four different elastic commercial 3D printing materials, namely Agilus A40 and A50, Visijet CE-NT A30 and A70 were selected and printed with different hardness. Totally four models were printed out and conducted CT scanned twice on a 192-slice CT scanner using the standard aortic CT angiography protocol, with and without contrast inside the lumen.Five reference points with region of interest (ROI) of 1.77 mm2 were selected at the aortic wall and intimal flap and their Hounsfield units (HU) were measured and compared with the CT attenuation of original CT images. The comparison between the patient’s aorta and models was performed through a paired-sample t-test to determine if there is any significant difference. Result: The mean CT attenuation of aortic wall of the original CT images was 80.7 HU. Analysis of images without using contrast medium showed that the material of Agilus A50 produced the mean CT attenuation of 82.6 HU, which is similar to that of original CT images. The CT attenuation measured at images acquired with other three materials was significantly lower than that of original images (p<0.05). After adding contrast medium, Visijet CE-NT A30 had an average CT attenuation of 90.6 HU, which is close to that of the original images with statistically significant difference (p>0.05). In contrast, the CT attenuation measured at images acquired with other three materials (Agilus A40, A50 and Visiject CE-NT A70) was 129 HU, 135 HU and 129.6 HU, respectively, which is significantly higher than that of original CT images (p<0.05). Conclusion: Both Visijet CE-NT and Agilus have tensile strength and elongation close to real patient’s tissue properties producing similar CT attenuation. Visijet CE-NT A30 is considered the appropriate material for printing aorta to simulate contrast-enhanced CT imaging of type B aortic dissection. Due to lack of body phantom in the experiments, further research with simulation of realistic anatomical body environment should be conducted.

3D Printing Technology in Drug Delivery: Recent Progress and Application

2019 ◽  
Vol 24 (42) ◽  
pp. 5039-5048 ◽  
Author(s):  
Sabna Kotta ◽  
Anroop Nair ◽  
Nimer Alsabeelah
Keyword(s):  
Drug Delivery ◽  
3D Printing ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Pharmaceutical Manufacturing ◽  
Layer By Layer ◽  
Printing Technology ◽  
Drug Dosing ◽  
3D Printing Technology ◽  
3D Printed

Background: 3D printing technology is a new chapter in pharmaceutical manufacturing and has gained vast interest in the recent past as it offers significant advantages over traditional pharmaceutical processes. Advances in technologies can lead to the design of suitable 3D printing device capable of producing formulations with intended drug release. Methods: This review summarizes the applications of 3D printing technology in various drug delivery systems. The applications are well arranged in different sections like uses in personalized drug dosing, complex drugrelease profiles, personalized topical treatment devices, novel dosage forms and drug delivery devices and 3D printed polypills. Results: This niche technology seems to be a transformative tool with more flexibility in pharmaceutical manufacturing. Typically, 3D printing is a layer-by-layer process having the ability to fabricate 3D formulations by depositing the product components by digital control. This additive manufacturing process can provide tailored and individualized dosing for treatment of patients different backgrounds with varied customs and metabolism pattern. In addition, this printing technology has the capacity for dispensing low volumes with accuracy along with accurate spatial control for customized drug delivery. After the FDA approval of first 3D printed tablet Spritam, the 3D printing technology is extensively explored in the arena of drug delivery. Conclusion: There is enormous scope for this promising technology in designing various delivery systems and provides customized patient-compatible formulations with polypills. The future of this technology will rely on its prospective to provide 3D printing systems capable of manufacturing personalized doses. In nutshell, the 3D approach is likely to revolutionize drug delivery systems to a new level, though need time to evolve.

scholarly journals Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

2019 ◽  
Vol 121 ◽  
pp. 04017
Author(s):  
Petr Zumberov ◽  
Sergey Kolesov ◽  
Vladimir Polyansky ◽  
Evgeniy Varshavchik
Keyword(s):  
3D Printing ◽  
Hydrogen Diffusion ◽  
Mathematic Model ◽  
Activation Energies ◽  
Modern World ◽  
Printing Technology ◽  
High Entropy ◽  
3D Printing Technology ◽  
3D Printed ◽  
Vacuum Heating

In modern world more and more materials with extreme properties are being used: high alloys, high-entropy alloys, nanostructured materials, etc. The extreme properties of these materials make them especially sensitive to hydrogen diffusion. Hydrogen can severely impair their properties and cause failures in structures and machines the material is used in. Nowadays, when structures and components are becoming increasingly complex, the use of 3D printing technology is becoming more widespread. Components made using 3D printing technologies are usually layered, which increase the amount of hydrogen that can diffuse into the material. The amount of hydrogen concentration in 3D printed nickel samples has been determined using vacuum heating method in hydrogen analyzer AV-1. The samples were held at different constant temperatures and the total amount of hydrogen extracted at those temperatures was calculated. A mathematic model was developed to evaluate the amount of hydrogen extracted at a given temperature. The evaluation was then compared to the experiment results, and the validity of the mathematical model and the selected hydrogen activation energies was verified.

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