scholarly journals The Condition of Ni-Cr Alloy Surface After Abrasive Blasting with Various Parameters

2019 ◽  
Vol 29 (3) ◽  
pp. 1439-1444
Author(s):  
Weronika Czepułkowska ◽  
Emilia Wołowiec-Korecka ◽  
Leszek Klimek
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Statistical Analysis ◽  
Metal Surface ◽  
Statistical Significance ◽  
Alloy Surface ◽  
Particle Sizes ◽  
Roughness Parameters ◽  
Abrasive Particles ◽  
Abrasive Blasting

Abstract The parameters of abrasive blasting process directly affect the condition of the metal surface, changing the degree of surface roughness and wettability, depending on the size of the used particle, the pressure or type of abrasive. The aim of this study was to analyze the condition of Ni-Cr alloy surface after abrasive blasting using various process variants. The samples were blasted by Al2O3 abrasive using various particle sizes and pressures of the process. Basic and specific roughness parameters were investigated, and a surface wettability test was performed, and the percentage share of abrasive particles penetrated in the surface after abrasive blasting was also examined. The most considerable differences in the condition of the surface were observed with the change in the particle size of Al2O3. Statistical analysis confirmed the statistical significance of all these relationships.

scholarly journals Statistical analysis of the influence of print run on surface roughness of digital flexo printing plates’ solid tone areas

2020 ◽  
Author(s):  
Sandra Dedijer ◽  
◽  
Magdolna Pál ◽  
Ivana Tomić ◽  
Stefan Poljak ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Statistical Analysis ◽  
Statistical Evaluation ◽  
Statistical Significance ◽  
Test Method ◽  
Roughness Parameters ◽  
Printing Plate ◽  
Significance Level ◽  
Surface Roughness Parameters ◽  
The Difference

In this study we have aimed to present statistical evaluation of changes in the surface roughness of the solid tone areas on CtP flexo printing plate in dependence of print run. Changes in flexo plate surface roughness is influenced by the plate-making process, printing pressure and speed, the interaction with the ink and printing substrate and by the wear of the printing plate due to long print-runs. Thus, the aim of this research was to evaluate the changes in the amplitude surface roughness parameters (Ra, Rp, Rv and Rz), between the printing plates used for different print runs. In the experiment, we have employed three sets of CtP flexo printing plates, for three colors-cyan, magenta and blue. The first set was not used for printing, the second was used to print 7 rolls of substrate and the third is used to print 11 rolls of printing substrate. The amplitude surface roughness parameters were compared by applying independentsamples t-test method using the software SPSS (Statistical Package for Social Science) with a 0.05 significance level. Statistical analysis revealed that the difference between the amplitude surface roughness parameters measured on CtP flexo printing plates are significant with a 95% confidence level, whereas the statistical significance pointed out that with the longer print runs, the difference will be strongly expressed.

scholarly journals EFFECT OF SPRAYING AND MESH SIZE ON SURFACE ROUGHNESS OF SS400 STEEL SANDBLASTING PROCESS

2021 ◽  
Vol 4 (02) ◽  
Author(s):  
Budi Saputra ◽  
Rieza Zulrian Aldio ◽  
Dedikarni
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Metal Surface ◽  
Mesh Size ◽  
Repair Process ◽  
Coating Material ◽  
Silica Sand ◽  
Test Results

During this time the ship's hull often occurs due to corrosion levels of salt in the Indonesian sea varies. The repair process often done to overcome this problem is by sandblasting which aims to clean the metal from the surface of the rust and provide suitable surface roughness on the metal surface so that the coating material can stick properly. This study aims to determine the size of silica sand and the repetition of the sandblasting process on the value of surface roughness and cleanliness of the material. In this study the SS400 material was sandblasting using 12 mesh, 16 mesh and 20 mesh sand at 7 bar, spraying 1x and 2x. From the test results obtained at a particle size of 20 mesh, 7 bar pressure, repeated spraying 2x which results in a surface roughness of 19.80 µm and cleanliness results achieved according to standard SA 2 1/2 (SSPC-SP10) from these conditions obtained surface roughness values according with the standard surface roughness of sandblasting and the level of cleanliness achieved in accordance with ISO 8503 standards and has been allowed for application.

Study on the Effect of Streambed Substrate on Invertebrate Diversity

2014 ◽  
Vol 937 ◽  
pp. 491-494
Author(s):  
Zhi Wen Luo ◽  
Wen Yan Wu ◽  
Kun Le
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Species Richness ◽  
Field Experiment ◽  
Stream Ecosystems ◽  
Particle Sizes ◽  
Invertebrate Community ◽  
Invertebrate Diversity ◽  
Invertebrate Composition ◽  
Substrate Particle

Invertebrates are important components of stream ecosystems. A field experiment was conducted to study the effects of substrate particle size, shape and roughness on the composition and biodiversity of invertebrates. The results show that the particle sizes, porosity,and interstial dimensions of the substrate affect the invertebrate community,while the shape and surface roughness of the substrate do not strongly affect the benthos composition and density. The invertebrate composition in the gravel is stable. The density and species richness in the gravels, leaf humus and are much higher than those in the black silt and sands.

Mechanics of Polishing

1998 ◽  
Vol 65 (2) ◽  
pp. 410-416 ◽  
Author(s):  
V. H. Bulsara ◽  
Y. Ahn ◽  
S. Chandrasekar ◽  
T. N. Farris
Keyword(s):  
Particle Size ◽  
Material Removal ◽  
Indentation Hardness ◽  
Particle Sizes ◽  
Size Distributions ◽  
Polishing Process ◽  
Average Force ◽  
Abrasive Particles ◽  
Effect Of Particle Size ◽  
Micro Indentation

A model has been developed to determine the number and sizes of abrasive particles involved in material removal in polishing, and the forces acting on these particles. The effect of particle size on these parameters has been simulated for a range of particle sizes. It is shown that when polishing with abrasive powders having relatively broad size distributions, only a very small percentage of the particles are involved in material removal. Further, these particles are comprised of the larger particles occurring in the tail end of the particle size distribution. The average force on a particle is found to be in the range of 5–200 mN under typical polishing conditions, which is of the order of loads used in micro-indentation hardness testing. These predictions of the model are consistent with observations pertaining to polished surfaces and the polishing process.

On the Effect of the Cutting Speed of a Water Jet Abrasive Cutting Process on the Surface Morphology of the Low Carbon Steel S235

2018 ◽  
Vol 919 ◽  
pp. 92-100
Author(s):  
Peter Košťál ◽  
Jana Moravčíková ◽  
Daynier Rolando Delgado Sobrino ◽  
Radovan Holubek
Keyword(s):  
Surface Roughness ◽  
Cutting Speed ◽  
Low Carbon Steel ◽  
Water Jet ◽  
Cutting Process ◽  
Low Carbon ◽  
Roughness Parameters ◽  
Machined Surface ◽  
Abrasive Particles ◽  
Surface Roughness Parameters

In order to increase the cutting and breaking capacity of abrasive water jet machining (AWJM), abrasive particles are usually added to water. The AWJM technology is generally used for harder and heavier machinable materials like thick sheets, composite materials with metal and ceramic properties and others within these categories to just cite a few. The contribution is mainly focused on the analysis of the surface properties of the steel S235 after the cutting process, and this depending on the cutting speed of the water jet. Three different cutting speeds were used for the analysis because this cutting parameter significantly affects the resulting quality of the machined surface. A contact profile method was used to analyze surface roughness. The observed surface roughness parameters were the Ra, Rt and Rz respectively. The above-mentioned surface roughness parameters were measured in three positions, i.e.: at the inlet, middle and exit positions of the water jet with respect to the machined material.

scholarly journals Study on Fabric Surface Roughness and its Influence on Worsted Fabric Abrasion Resistance

2015 ◽  
Vol 10 (4) ◽  
pp. 155892501501000
Author(s):  
Sara Asghari Mooneghi ◽  
S. Mohammad Hosseini Varkiyani ◽  
Siamak Saharkhiz
Keyword(s):  
Surface Roughness ◽  
Statistical Analysis ◽  
Abrasion Resistance ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Roughness Parameters ◽  
3D Surface Roughness ◽  
Strong Linear Correlation ◽  
Fabric Surface ◽  
2D And 3D

Surface roughness is of paramount importance in predicting tactile properties of fabrics. This study aimed at investigating surface roughness and the effect of this property on the abrasion resistance of worsted fabrics. Nine different groups of worsted fabrics were produced. The fabrics had three weave types and three areal densities. A non-contact laser based system was developed to scan the surface of the fabrics. In order to extract the surface roughness profile, a new method of data analysis was presented. Several two dimensional (2D) and three dimensional (3D) roughness parameters were introduced and calculated. Statistical analysis proved that the effect of weave type and weft density was significant on all of the 2D and 3D surface roughness parameters at a confidence range of 95%. However, the 3D parameters provided the surface roughness with just one number in comparison with the 2D ones (warp and weft directions). Therefore, the 3D parameters provided a better indication for the surface roughness which had the effect of both warp and weft directions. Results showed that there was a strong linear correlation between the abrasion resistance and the 3D roughness parameters.

scholarly journals Statistical Analysis of Surface Roughness Parameters for Weft Knitted Fabrics Measured by the Textile Surface Tester (TST)

2012 ◽  
Vol 7 (4) ◽  
pp. 155892501200700 ◽  
Author(s):  
Najeh Maâtoug ◽  
Mehdi Sahnoun ◽  
Faouzi Sakli
Keyword(s):  
Surface Roughness ◽  
Statistical Analysis ◽  
Sampling Time ◽  
Structural Factors ◽  
Roughness Parameters ◽  
Knitted Fabrics ◽  
Signal Sampling ◽  
Test Conditions ◽  
Surface Roughness Parameters ◽  
Yarn Count

The present paper concerns the statistical analysis of the surface roughness evaluation of knitted fabrics by the Textile Surface Tester. The main objectives were, firstly, focused on investigating the effect of knitted fabrics structural factors and the test conditions on the surface absolute roughness, the total roughness and the standard deviation. Secondly, the relationship between sample characteristics (face, yarn count, loop length), the test conditions (the force and the slipping speed of the sensor feeler on the sample and signal sampling time), and the surface roughness parameters were analyzed and modeled through regression analysis. The combined effects of the input parameters and their two-way interactions on the test bench outputs were investigated using the analysis of variance (ANOVA). The percent contribution ratio was used to show the influence of inputs and their interactions on surface roughness parameters. The results show how much surface roughness is mainly influenced by the knits structural factors. Also, it is underlined that the applied force by the sensor feeler on the fabric has an important effect on outputs. Finally, the sensor slipping speed on the sample and the signal sampling time have no important effects on outputs. Models were developed using experimental results from a full factorial experimental design. The adjusted coefficients of determination R2adj were found to be greater than 80%.

A Study on the Tolerance Value and Biodiversity of Benthic Macroinvertebrates

2014 ◽  
Vol 513-517 ◽  
pp. 3283-3286
Author(s):  
Zhi Wen Luo ◽  
Wen Yan Wu
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Species Richness ◽  
Field Experiment ◽  
Benthic Macroinvertebrates ◽  
Macroinvertebrate Community ◽  
Stream Ecosystems ◽  
Particle Sizes ◽  
Substrate Particle

Macroinvertebrates are important components of stream ecosystems. A field experiment was conducted to study the effects of substrate particle size, shape, and roughness on the composition and biodiversity of macroinvertebrates. The results show that the particle sizes, porosity, and interstial dimensions of the substrate affect the macroinvertebrate community, while the shape and surface roughness of the substrate do not strongly affect the macrobenthos composition and density. The macroinvertebrate composition in gravel is stable. The density and species richness in the gravels, leaf humus and are much higher than those in the black silt and sands.

scholarly journals Investigation of Roughness Periodicity on the Hydrophobic Properties of Surfaces

2015 ◽  
Vol 68 (8) ◽  
pp. 1228 ◽  
Author(s):  
Jeremiah Toster ◽  
David Lewis
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Silica Particle ◽  
Contact Angles ◽  
Particle Sizes ◽  
Hydrophobic Properties ◽  
Water Contact ◽  
Effect Of Particle Size

Hydrophobic films were synthesized with a variety of silica particle sizes ranging from 58 to 1428 nm to investigate the effect of particle size on the contact and sliding angles. While the surface roughness created by varying the particle size did not appear to affect water contact angles, the sliding angles showed a significant monotonic decrease, reducing from 90° to 20°.

scholarly journals Influence of Surface Roughness on Selected Geometric Characteristics of Laser Beam Welded Joints of AW 2099 Alloy

2020 ◽  
Vol 28 (47) ◽  
pp. 56-64
Author(s):  
Filip Šugra ◽  
Milan Marônek ◽  
Jozef Bárta ◽  
Michaela Lopatková ◽  
Miloš Mičian
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Welded Joints ◽  
Statistical Significance ◽  
Roughness Parameter ◽  
Limiting Factors ◽  
Roughness Parameters ◽  
Geometric Characteristics ◽  
Mechanical And Physical Properties ◽  
Weld Root

Abstract Al-Li alloys are used in various industries owing to their good mechanical and physical properties. However, one of the limiting factors of welding the aluminium alloys by laser beam is the high reflectivity of the beam and thus the reduced efficiency of the laser. Reduction of reflectivity can be achieved by increasing the surface roughness, which may have a beneficial effect on the absorption of the laser, resulting into affecting the weld bead dimensions. The paper deals with the analysis of the influence of surface roughness of welded materials on geometry of welded joints. Specimens of AW 2099 alloy 2099 with a thickness of 3 mm were milled to achieve different levels of roughness, and then laser welded. Characteristic dimensions of the welds (weld surface/root width) were measured. The obtained data were statistically analysed using the ANOVA method, in order to assess statistical significance of the influence of individual roughness parameters on the geometric characteristics of welds. The results of the analysis showed that, within the monitored range and surface roughness parameters, only the influence of roughness parameter Rq, Rz on the weld root width can be considered statistically significant.

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