Investigation of the Machinability of PA-6/nano-CaCO3 Composite

2012 ◽  
Author(s):  
Reza Farshbaf Zinati ◽  
Mohammad Reza Razfar ◽  
Mehdi Haghi
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Physical Properties ◽  
Cross Section ◽  
Cutting Forces ◽  
Nano Composites ◽  
Milling Parameters ◽  
The Past ◽  
Caco3 Content ◽  
Extrusion Method

Nowadays, polymer nano-composites have attracted manufacturers’ attention because of good mechanical, thermal, and physical properties. During the past decade, the requirement of the direct machining of polymer nano-composites increases because most of the polymer nano-composites were produced by extrusion method in simple cross section shapes and request for personalized products increases. In this study, the effect of milling parameters (spindle speed and feed per tooth) and nano-CaCO3 content on the machinability properties of PA-6/nano-CaCO3 composites was studied by means of analysis of variance. Additionally, the effect of nano-CaCO3 content on the mechanical properties of PA-6/nano-CaCO3 composites was investigated. To this end, several experiments were carried out on PA-6/nano-CaCO3 composites to attain the required data. The results reveal that the nano-CaCO3 content on PA-6 significantly decreases the cutting forces, but does not have a considerable significance on surface roughness.

scholarly journals Kekasaran Permukaan Resin Komposit Nanofilled dan Nanohybrid Setelah Paparan Asap Rokok Kretek

2019 ◽  
Vol 8 (1) ◽  
pp. 30
Author(s):  
Johanna Chandra ◽  
Laksmiari Setyowati ◽  
Setyabudi Setyabudi
Keyword(s):  
Surface Roughness ◽  
Physical Properties ◽  
Cigarette Smoke ◽  
Public Health Problem ◽  
Composite Resins ◽  
Dental Composites ◽  
Distilled Water ◽  
Control Groups ◽  
The Past ◽  
Nanohybrid Composite

Background: Cigarette smoking is a public health problem that may influence physical properties of dental composites. Surface roughness is one of the physical properties of restorative materials that can influence their success. The use of nanofilled and nanohybrid composites in dentistry has substantially increased over the past few years. Purpose: The purpose of this study was to evaluate the surface roughness of nanofilled and nanohybrid composite resins exposed to kretek cigarette smoke. Methods: Twelve cylindrical specimens were prepared of each material and divided into two groups (n=6). For the control groups, the specimens were immersed in distilled water for 24 hours at 37oC and the water was renewed daily. For the experimental groups, the specimens were exposed daily to kretek cigarette smoke, then washed and stored in distilled water at 37oC. After 21 days, specimens were measured using a Surface Roughness Tester and the data was statistically analyzed. Result: Independent-T Test revealed that there were statistically significant differences in the surface roughness between control and experimental groups both nanofilled and nanohybrid, and between experimental groups nanofilled and nanohybrid. Conclusion: The exposure to kretek cigarette smoke can significantly increase the surface roughness of nanohybrid composites more than nanofilled composites.

Effect of thermomechanical densification of pine wood (Pinus sylvestris L.) on cutting forces and roughness during milling

2021 ◽  
Vol 113 ◽  
pp. 36-42
Author(s):  
Barbara Białowąs ◽  
Karol Szymanowski
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Statistical Analysis ◽  
Pinus Sylvestris ◽  
Cutting Forces ◽  
Physical And Mechanical Properties ◽  
Milling Process ◽  
Pine Wood ◽  
Roughness Index ◽  
Modified Wood

Effect of thermomechanical densification of pine wood (Pinus sylvestris L.) on cutting forces and roughness during milling. The paper presents the results of research concerning the assessment of machinability of pine wood thermomechanically compacted. The assessment was made on the basis of the cutting forces and surface roughness after the milling process. Selected properties of native and modified wood were examined. Based on the research, it was found that compacted wood is characterized by higher cutting forces during milling. The surface quality after milling was examined and the roughness index Ra values were determined. The research shows that the modified wood is characterized by a lower Ra value both along and across the grain. Statistical analysis showed that the modification had a statistically significant effect on the values of cutting forces and the physical and mechanical properties of the tested wood.

Effect of Carbon Black on Curing Behavior, Mechanical Properties and Viscoelastic Behavior of Natural Sponge Rubber-Based Nano-Composites

2012 ◽  
Vol 510-511 ◽  
pp. 532-539 ◽  
Author(s):  
M.A. Bashir ◽  
M. Shahid ◽  
R.A. Alvi ◽  
A.G. Yahya
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Black ◽  
Natural Rubber ◽  
Physical Properties ◽  
Viscoelastic Behavior ◽  
Nano Composites ◽  
Curing Behavior ◽  
Auxetic Materials ◽  
Viscosity Variation

Natural rubber (polymer designation cis-1-4 polyisoprene, is obtained from the sap ("latex") of several rubber-yielding plants (e.g.,HeveaBrasiliensisandPartheniaargentatum) by coagulation with chemicals, drying, electrical coagulation, and other processes. Foamy or sponge structure of natural rubber (NR) is very useful in aerospace and as auxetic materials (exhibiting negative poisons ratio) for use in application of homeland security.The main aim of this research to estimate the influence of carbon black on mechanical properties, curing and viscosity variation behaviors of the natural rubber based composites. Different amounts of carbon black were used along with other fillers. The influence of carbon black on curing behavior and mechanicalproperties of natural rubber foams was investigated at different feedingratios of the carbon black. The physical properties of the foamed NRs were then measured as a function of carbon blacks content. The mechanical properties of the foamed NRs such as tensile strength,strength at break and modulus,were gradually increased with increasingcarbon black content whereas elongation decreasedat break.

The Application of Grinding of Ceramic Materials

2018 ◽  
Vol 919 ◽  
pp. 215-221
Author(s):  
Dana Stancekova ◽  
Jana Petrů ◽  
Jaroslava Svobodova ◽  
Izabela Miturska ◽  
Sarka Molotova
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Production Process ◽  
Cutting Forces ◽  
High Hardness ◽  
Ceramic Materials ◽  
Cutting Conditions ◽  
Whole Process ◽  
Technical Ceramics ◽  
Roughness Evaluation

An application of hard engineering materials depends especially on their specific properties, included mechanical properties and their machinability. Technical ceramics belongs to such materials. Nowadays, due to its properties, it is a process of grinding that is applied in machining. Because the technical ceramics has high hardness and brittleness it is important to pay attention to the whole process of machining. In this case of the grinding, there is need to pay attention to the process from disc engagement to grind off the desired layer. The paper deals with an implementation of grinding of ceramic materials in context of determining of elements of cutting forces and the surface roughness evaluation. These are important aspects for determining the suitability of the cutting conditions and the possibility of their use in the production process.

Spatially Dependent Mechanical Properties Of Rat Whiskers For Tactile Sensing

2004 ◽  
Vol 841 ◽  
Author(s):  
E. K. Herzog ◽  
D. F. Bahr ◽  
C. D. Richards ◽  
R. F. Richards ◽  
D. M. Rector
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Physical Properties ◽  
Cross Section ◽  
High Frequency ◽  
Tactile Sensing ◽  
Biologically Inspired ◽  
Frequency Information ◽  
Solid Objects ◽  
New Generation

ABSTRACTA new generation of sensors based on biologically inspired whisking action will help determine the presence and location of solid objects and fluid vortices similar to mechanisms used by whisker bearing animals such as rats and seals. By using nanoindentation, we demonstrate that mechanical properties are essentially uniform by cross section, but vary longitudinally from the whisker base (a 3.9 GPa elastic modulus) to the tip (a 3.1 GPa elastic modulus). Several recent studies show propagation of high frequency information through whiskers that are tuned by their physical properties. In order to fully understand and model these properties, this study demonstrates a more complex whisker structure than previously assumed.

scholarly journals Physical Properties of Modern Reciprocal Endodontic Systems and Fatigue Failure Testing in Simulated Clinical Conditions

2021 ◽  
Vol 11 (23) ◽  
pp. 11160
Author(s):  
Alexandr Jusku ◽  
Jan Tomáštík ◽  
Lukáš Václavek ◽  
Petr Jirásek ◽  
Ľuboš Harvan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Physical Properties ◽  
Cross Section ◽  
Thermal Processing ◽  
Fatigue Testing ◽  
Cyclic Fatigue ◽  
Factors Affecting ◽  
3D Microscopy ◽  
The Difference ◽  
Clinical Conditions

Instrument fracture ranks among the most crucial complications during the endodontic treatment of a tooth. In order to better understand the practical limits of the instrument, the relation between the cyclic fatigue resistance and physical properties such as hardness, modulus of elasticity, creep and surface roughness were explored. Cyclic fatigue testing in an artificial root canal at intracanal temperature, nanoindentation and 3D microscopy were used for evaluation of four commonly used thermomechanically treated NiTi endodontic instruments (Unicone Plus 6/025, Unicone 6/025, Reciproc Blue R25 and WaveOne Gold Primary). Cyclic fatigue results were analyzed using the Kruskal–Wallis, Mann–Whitney and Bonferroni corrections. The wear resistance of Unicone 6/025 instruments was significantly lower compared to all other instruments (p < 0.05). WaveOne Gold Primary was significantly less resistant than Unicone Plus 6/025 and Reciproc Blue R25, while the difference between Reciproc Blue R25 and Unicone Plus 6/025 was insignificant (p > 0.05). These results are in correlation with measurements of local mechanical properties (hardness, elastic modulus and their ratios H/E and H3/E2). Even though surface roughness, area of cross-section and shape of instruments are important factors affecting instruments behavior, thermal processing appears to be the most important.

Study on the CMP Pad Life with its Mechanical Properties

2008 ◽  
Vol 389-390 ◽  
pp. 481-486 ◽  
Author(s):  
Pei Lum Tso ◽  
Zhe Hao Huang ◽  
Sheng Wei Chou ◽  
Cheng Yi Shih
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Physical Properties ◽  
Chemical Mechanical Polishing ◽  
Polishing Process ◽  
Polishing Pad ◽  
Pad Conditioning ◽  
The Difference ◽  
The Stability ◽  
The Cost

The primary consumables in chemical mechanical polishing (CMP) are the polishing pad and the slurry. The polishing pad significantly influences the stability of the polishing process and the cost of consumables (CoC). During the polishing process, a diamond dresser must be frequently employed to remove the debris to prevent accumulation, a process known as pad conditioning. In this paper, we investigated the physical properties of the CMP pad such as compressibility, thickness, and surface roughness. The difference between new and used pads has been studied. Conclusively, conditioning via a diamond dresser will extend pad life and reduce CoC.

A comparative study of mechanical properties and machinability of wrought and additive manufactured (selective laser melting) titanium alloy – Ti-6Al-4V

2017 ◽  
Vol 23 (6) ◽  
pp. 1051-1056 ◽  
Author(s):  
Manikandakumar Shunmugavel ◽  
Ashwin Polishetty ◽  
Moshe Goldberg ◽  
Rajkumar Singh ◽  
Guy Littlefair
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Cutting Forces ◽  
Lower Surface ◽  
Content Type ◽  
The Difference

Purpose The purpose of this paper is to study and compare the mechanical properties and machinability characteristics of additive manufactured titanium alloy Ti-6Al-4V with conventionally produced wrought titanium alloy,Ti-6Al-4V. The difference in mechanical properties such as yield strength, ultimate tensile strength, micro hardness, percentage of elongation and their effect on machinability characteristics like cutting forces and surface roughness are studied. It was found that higher strength and hardness of SLM Ti-6Al-4V compared to wrought Ti-6Al-4V owing to its peculiar acicular microstructure significantly affected the cutting forces and surface roughness. High cutting forces and low surface roughness were observed during machining of additive manufactured components compared to its wrought counterpart because of their difference in strength, hardness and ductility. Design/methodology/approach Mechanical properties like yield strength, ultimate tensile strength, hardness and percentage of elongation and machinability characteristics like cutting forces and surface roughness were studied for both wrought and additive manufactured Ti-6Al-4V. Findings Mechanical properties like yield strength, ultimate tensile strength and hardness were higher for additive manufactured components as compared to the wrought component. However additive manufactured components significantly lacked in ductility as compared to the wrought parts. Concerning machining, higher cutting forces and lower surface roughness were observed in additive manufactured Ti-6Al-4V compared to the wrought part as a result of differences in mechanical properties of these differently processed materials. Originality/value This paper, for the first time, discusses the machining capabilities of additive manufactured Ti-6Al-4V.

Spatially Dependent Mechanical Properties Of Rat Whiskers For Tactile Sensing

2004 ◽  
Vol 844 ◽  
Author(s):  
E. K. Herzog ◽  
D. F. Bahr ◽  
C. D. Richards ◽  
R. F. Richards ◽  
D. M. Rector
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Physical Properties ◽  
Cross Section ◽  
High Frequency ◽  
Tactile Sensing ◽  
Biologically Inspired ◽  
Frequency Information ◽  
Solid Objects ◽  
New Generation

ABSTRACTA new generation of sensors based on biologically inspired whisking action will help determine the presence and location of solid objects and fluid vortices similar to mechanisms used by whisker bearing animals such as rats and seals. By using nanoindentation, we demonstrate that mechanical properties are essentially uniform by cross section, but vary longitudinally from the whisker base (a 3.9 GPa elastic modulus) to the tip (a 3.1 GPa elastic modulus). Several recent studies show propagation of high frequency information through whiskers that are tuned by their physical properties. In order to fully understand and model these properties, this study demonstrates a more complex whisker structure than previously assumed.

Relationship of Pocket Geometry and Tool Path Strategy with 2 1/2-D Milling Parameters: Machining Time, Cutting Forces and Surface Roughness

2014 ◽  
Vol 797 ◽  
pp. 78-83
Author(s):  
Pablo Eduardo Romero ◽  
Ruben Dorado ◽  
Francisco Alberto Díaz Garrido ◽  
Eva María Rubio
Keyword(s):  
Surface Roughness ◽  
Cutting Forces ◽  
Tool Path ◽  
Machining Time ◽  
Milling Parameters ◽  
Relationship Of ◽  
The Relationship

2 1/2-D pocketing is an important operation in aeronautic and automotive industries. In the present paper, it is studied the relationship among the pocket geometry and the tool path strategy chosen with interesting parameters as: machining time, cutting forces and surface roughnes. The pocketing tests have been performed on UNS A96063, an increasingly frequent alloy in such industries.

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