Effect of Printing Temperature on Mechanical Properties and Surface Quality of Photosensitive Resin Rapid Prototyping Parts

2017 ◽  
Vol 727 ◽  
pp. 466-470
Author(s):  
Xian Yong Zhu ◽  
Fei Fei Cui ◽  
Cheng Jiang ◽  
Dong Ni Geng ◽  
Xue Lei Xu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Rapid Prototyping ◽  
Bending Strength ◽  
Bending Tests ◽  
Bending Modulus ◽  
C 23 ◽  
Photosensitive Resin ◽  
Tensile Elastic Modulus ◽  
C 30

Abstract. The rapid prototypes of different printing temperature by Objet30 Stratasys Pro printer were found a certain difference in performance in the process of using the process.In order to studied the effect of printing temperature on the rapid prototyping of photosensitive resin, tensile and bending tests were carried out on the rapid prototyping parts at 12°C, 18°C, 21°C, 23°C, 25°C, 30°C,respectively,and the rigidity and surface roughness of rapid prototyping parts were measured.Research shows：the tensile strength increases with the increase of printing temperature , tensile elastic modulus fluctuates with the printing temperature , they all increases rapidly after 25°C;The bending strength increases proportional with the increase of printing temperature, and the bending modulus increases first and then tends to decrease with the increase of printing temperature;The hardness value increases slowly with the increase of printing temperature, and increases obviously after 20°C,the hardness value in the middle of the prototype parts is bigger than the edge parts；The surface roughness with increasing printing temperature, although it is floating up and down, but have little effect.

scholarly journals Experimental studies of the quality of embossed characters of the Braille alphabet

2016 ◽  
Vol 64 (3) ◽  
pp. 607-614
Author(s):  
R. Barczyk ◽  
D. Jasińska-Choromańska
Keyword(s):  
Surface Roughness ◽  
Statistical Analysis ◽  
3D Printing ◽  
Rapid Prototyping ◽  
Experimental Studies ◽  
Printed Text ◽  
Blind Persons ◽  
Blind Individuals

Abstract The paper presents studies pertaining to the quality of embossed characters of the Braille alphabet used, among other applications, for tagging drug labels. The following parameters of embossed inscriptions were measured: height, diameter of the dots and surface roughness (18 samples with various combinations of their values). 48 blind individuals assessed the quality of the printed text. Statistical analysis proved that a text with dots having height of 0.9 millimeter, diameter of 1.6 millimeters and roughness Ra of about 1 micrometer to be the best. The samples had been made using two different methods of rapid prototyping: PolyJet and SLS. 3D printing is increasingly popular and the studies proved the usefulness of these methods for labeling with embossed inscriptions, due to the repeatability, durability and quality they ensure. The assessing group of blind individuals was comprised of 24 persons 14–17 years old and other 24 persons aged over 60 who were not proficient in reading Braille alphabet, This allows to conclude that a text featuring the above values of the parameters will be easy to read for the majority of blind persons.

Bending Properties and Failure Mechanisms of Tapered 3D Braided Composites

2011 ◽  
Vol 332-334 ◽  
pp. 1468-1471 ◽  
Author(s):  
Can Can Cheng ◽  
Zhao Lin Liu ◽  
Li Fang Liu ◽  
Jian Yong Yu
Keyword(s):  
Failure Modes ◽  
Bending Strength ◽  
Failure Mechanisms ◽  
Reduction Technique ◽  
Braided Composites ◽  
Bending Properties ◽  
Bending Tests ◽  
Three Point Bending ◽  
Bending Modulus ◽  
3D Braided Composites

Tapered 3D braided composites are prepared by column yarn-reduction technique, unit yarn-reduction technique and cutting, respectively. Bending properties in the tapered regions of the composites are obtained by three-point bending tests, and SEM photographs of the fracture surfaces are observed to analyze the failure mechanisms. Results show that bending modulus and bending strength of the yarn-reduction composites are significantly higher than those of the cut composites, and the unit yarn-reduction composites are slightly stronger than the column yarn-reduction composites. The saw-tooth propagation of matrix crackings and interfacial debondings are the primary failure mechanisms of the yarn-reduction composites, while yarn breakages and yarn pulling-outs are the main failure modes of the cut composites.

Bending strength of ceramic compounds bonded with silicate-based glass solder

2021 ◽  
Vol 63 (7) ◽  
pp. 593-598
Author(s):  
Jan-Oliver Sass ◽  
Abdessalam Jakobi ◽  
Aurica Mitrovic ◽  
Cornelia Ganz ◽  
Jennifer Wilken ◽  
...  
Keyword(s):  
Bending Strength ◽  
Ethanol Treatment ◽  
Bending Tests ◽  
Bonding Parameters ◽  
Soldering Process ◽  
Four Point Bending ◽  
Process Pressure ◽  
Monolithic Zirconia ◽  
Ceramic Compounds

Abstract In the field of dental technology, the length of ceramic pontics is limited to avoid mechanical failure. To reduce thermal-induced residual stress within the ceramic, using smaller subcomponents and subsequent bonding with silicate-based glass solder may be a favorable approach. Thus, the bending strength of zirconia compounds bonded with different silicate-based glass solders was investigated. For this purpose, rectangular specimens made of zirconia were bonded by glass solder. Parameters such as the scarf angle (45° and 90°), two different glass solders, as well as the soldering process (pressure and surface treatment) were varied. All specimens were subjected to quasi-static four-point bending tests according to DIN EN ISO 843-1. Additionally, the quality of the glass solder connection was evaluated using μCT and fractography. In the present study, zirconia compounds were sucessful bonded of zirconia compounds using silicate-based glass solder was. No significant differences in terms of bending strength were observed with respect to the different bonding parameters analyzed. The highest bending strength of 130.6 ± 50.5 MPa was achieved with a 90° scarf angle combined with ethanol treatment of the specimens before soldering and an additional application of a pressure of 2 bars in a dental pressure pot before subsequent soldering. Nevertheless, the bending strengths were highly decreased when compared to monolithic zirconia specimens (993.4 ± 125.5 MPa).

scholarly journals Method of Expanding Measurement Limits of Digital Dynamometer in Testing Strength of Moulded Peat Products

2020 ◽  
Vol 174 ◽  
pp. 01035
Author(s):  
Alexander Yablonev ◽  
Anna Guseva
Keyword(s):  
Strain Gauge ◽  
Test Bench ◽  
Bending Strength ◽  
Maximum Load ◽  
Quality Parameters ◽  
Mining Machine ◽  
Bending Tests ◽  
Operating Modes ◽  
Important Quality

The work is carried out to survey operating quality of sod peat produced by milling-forming machines in the field. The surveillance will help make necessary changes in mining machine designs and operating modes in a timely manner. One of the most important quality parameters of sod peat is its bending strength. To evaluate it, Tver State Technical University has developed a destruction test bench. The test bench is equipped with a digital dynamometer and a strain-gauge bracket torecord the destructive load. However, the instruments are designed for 1 kN maximum load. The bending tests of moulded peat products conducted by the authors showed that the destructive load often exceeds 1 kN, which meant that the generation and measurement limits of destructive load have to be expanded within the range of equipment being available. The problem has been solved by installing additional elements in the strain- gauge bracket and making a calibration chart. The method can expand the generation and measurement limits of destructive load by more than 50 %.

scholarly journals Potensi Karton Bekas Minuman sebagai Komposit PolyAl-Fiber

2020 ◽  
Vol 10 (01) ◽  
pp. 21
Author(s):  
Andri Taufick Rizaluddin ◽  
Ike Rostika ◽  
Reza Bastari Imran Wattimena
Keyword(s):  
Moisture Content ◽  
Water Absorption ◽  
Bending Strength ◽  
Raw Materials ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Wood Composite ◽  
Hot Press ◽  
Bending Modulus

Dalam rangka penanggulangan limbah karton bekas minuman (KBM), telah dikembangkan proses daur ulang untuk mengembalikannya menjadi bahan baku. Tujuan penelitian ini adalah untuk mengetahui potensi pemanfaatan KBM sebagai bahan baku komposit yang lebih tahan air, dan membandingkannya dengan spesifikasi teknis produk sejenis. Pembuatan komposit dilakukan dengan pemanasan menggunakan alat hot press pada suhu 165oC dan tekanan 25-30 kg/cm2 selama 10 menit. Produk komposit yang diperoleh memiliki nilai bending strength 12,78 MPa, bending modulus 11,60 GPa, flammability 3 cm/menit, daya serap air 2,1-14,1%, kadar air 0,9-1,9%, dan rapat massa 0,68-0,94 g/cm3, pada ketebalan 2,5-3,5 mm. Komposit PolyAl-fiber dapat memenuhi persyaratan standar papan serat, papan partikel maupun komposit kayu plastik tanpa penambahan bahan maupun proses lain, yang mengindikasikan komposit PolyAl-fiber memiliki potensi untuk digunakan dalam berbagai keperluan sejenis. Komposit PolyAl-fiber akan dapat menghasilkan papan komposit dengan kualitas lebih baik, karena lebih fleksibel, lebih tahan air, dan lebih tahan api bila dibandingkan dengan produk lain yang terbuat dari bahan baku kayu atau biomassa.Potential of Used Beverages Cartons for PolyAl-Fiber Composite AbstractVarious recycling processes have been developed to overcome the problem of used beverage carton (UBC) waste. Research was conducted to determine the potential utilization of UBC as a material for more waterproof composite and compared it to similar products. The composites were made using hot press machine at temperature of 165oC and pressure of 25-30 kg/cm2 for 10 minutes with 5% - 30% fiber content. The PolyAl-fiber composite obtained had bending strength of 12.78 MPa, bending modulus of 11.60 GPa, flammability of 3 cm/min, water absorption of 2.1-14.1%, moisture content of 0.9-1.9%, and density of 0.68-0.94 g/cm3, at thickness of 2.5-3.5 mm. The PolyAl-fiber composite could meet the requirements for fiberboard, particleboard, or plastic wood composite standards without extra additives or treatment to the raw materials, indicating that it could be used for similar purposes. The PolyAl-fiber composites may able to produce a better quality of composite boards, due to their flexible, waterproof, and fire-resistant characteristics compared to similar products made from wood or                                                                                                                                                          

Improving of quality of gate assembly contact surfaces of high-pressure fi ttings by diamond burnishing

2020 ◽  
pp. 99-104
Author(s):  
S.A. Zaydes ◽  
A.N. Mashukov ◽  
T.Ya. Druzhinina
Keyword(s):  
Surface Roughness ◽  
High Pressure ◽  
Main Part ◽  
Conical Surface ◽  
The Real ◽  
Metal Seal ◽  
Diamond Burnishing ◽  
Air Tightness ◽  
Contact Surfaces

The contact belt of the gate assembly is the main part of high pressure fittings. The serviceability of the fittings assembly as whole depends on the air-tightness and quality of the mating surfaces. The technology of diamond burnishing allows to increase the interface of the nodes by red ucing the surface roughness of the metal-to-metal seal. The real experience for improving of the fittings contact belt due to the use of diamond burnishing of the nozzles seats and the conical surface of the rods.

scholarly journals Smoothing additive manufactured parts using ns-pulsed laser radiation

2021 ◽  
Author(s):  
Florian Kuisat ◽  
Fernando Lasagni ◽  
Andrés Fabián Lasagni
Keyword(s):  
Surface Roughness ◽  
Mechanical Performance ◽  
State Of The Art ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Laser Source ◽  
Pulsed Laser Radiation ◽  
Current State ◽  
The Impact

AbstractIt is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.

Influence of surface roughness, friction coefficient, and wrap angle on clinching joint strength and its correlation with belt friction phenomenon

2021 ◽  
pp. 135065012110253
Author(s):  
Santosh Kumar ◽  
Vimal Edachery ◽  
Swamybabu Velpula ◽  
Avinash Govindaraju ◽  
Sounak K. Choudhury ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Joint Strength ◽  
Joint Interface ◽  
Cross Sectional ◽  
Lap Shear ◽  
Mathematical Correlation ◽  
Mechanical Clinching ◽  
Wrap Angle

Clinching is an economical sheet joining technique that does not require any consumables. Besides, after its usage, the joints can be recycled without much difficulty, making clinching one of the most sustainable and eco-friendly manufacturing processes and a topic of high research potential. In this work, the influence of surface roughness on the load-bearing capacity (strength) of joints made by the mechanical clinching method in cross-tensile and lap-shear configuration is explored. Additionally, a correlating mathematical model is established between the joint strength and its surface parameters, namely, friction coefficient and wrap angle, based on the belt friction phenomenon. This correlation also explains the generally observed higher strength in lap-shear configuration compared to cross-tensile in clinching joints. From the mathematical correlation, through friction by increasing the average surface roughness, it is possible to increase the strength of the joint. The quality of the thus produced joint is analyzed by cross-sectional examination and comparison with simulation results. Experimentally, it is shown that an increment of >50% in the joint strength is achieved in lap-shear configuration by modifying the surface roughness and increasing the friction coefficient at the joint interface. Further, the same surface modification does not significantly affect the strength in cross-tensile configuration.

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