Abrasive Wear: Design of Experiment (DOE) for Determining the Wear on Crowns Used by Drilling Companies for Mineral Surveys

2013 ◽  
Vol 660 ◽  
pp. 69-74
Author(s):  
Zirlene Alves da Silva Santos ◽  
Jefferson Januário Mendes ◽  
Adilson Rodrigues da Costa
Keyword(s):  
Statistical Analysis ◽  
Chemical Composition ◽  
Abrasive Wear ◽  
Performance Improvement ◽  
Design Of Experiment ◽  
Planning Process ◽  
Field Research ◽  
Wear Test ◽  
Material Loss ◽  
Controllable Factors

Currently companies seek performance improvement for equipment and components, and an important factor that influences performance is wear. The objective of this study was to demonstrate the applicability of a methodology that was developed using literature, field research, brainstorming, optical microscopy, statistical analysis.Wear tests for drilling crown samplesfor the production process were performed. - The crown’s chemical composition was analyzed to see if it was appropriate for the soil’s mineral lithology. Having done this, a statistical analysis was made. using Minitab 16 software, specifically applying DOE (2Kfactorial) technique. With the statistical result, a prototype was produced and subjected to a wear test for analysis of material loss compared to crowns having a better performance.Thus, the conclusion reached was that the planning process improves withthis experimental probing, which helps to identify and correct controllable factors.

scholarly journals Effect of Tungsten Carbides on Abrasive Wear of Hardfacing Coatings

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Philip Pichler ◽  
Martin Leitner ◽  
Florian Grün ◽  
Jürgen Haßler
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Wear Mechanisms ◽  
Fine Particles ◽  
Wear Test ◽  
Wear Loss ◽  
Tungsten Carbides ◽  
Material Loss ◽  
Steel Wheel ◽  
The Mean

The aim of this study is to investigate the abrasive wear loss as well as the wear mechanisms of hardfacing layers with and without tungsten carbides (WC) included in the matrix in different friction wheel test (FWT) configurations. The FWT setup is varied in regard to the materials of the rotating wheels, whereat steel and rubber materials are utilized to achieve varying wear mechanisms as representative conditions for stone milling as well as low density wood cutting processes. Coatings including fine particles of WC highlight the highest resistance against abrasive wear in rubber wheel testing condition, at which microcutting acts as the dominant effect. In comparison to the hardfacings without WC, the mean material loss majorly decreases by about 75%. On the contrary, the mean material loss of fine WC reinforced coatings increases up to 93% compared to the condition without WC if a steel wheel is utilized as rotating counterpart. Thereby, the coatings with comparably coarse WC reveal the minimum material loss with a decrease over 70% compared to the condition without WC. In conclusion, the inclusion of WC in hardfacing coatings significantly increases the wear resistance. The experimental wear test results highlight the fact that in order to achieve the optimal wear resistance the material characteristics of the hardfacings need to be properly defined considering the predominant wear mechanisms under in-service conditions.

scholarly journals The corrosion-resistant Ni-based coatings and their tribological properties

2020 ◽  
Vol 64 (2) ◽  
pp. 38-44
Author(s):  
E. Zdravecká ◽  
J. Tkáčová
Keyword(s):  
Chemical Composition ◽  
Abrasive Wear ◽  
Sliding Wear ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Metal Powders ◽  
Adhesive Bonds ◽  
Structure Of Coatings ◽  
Three Body ◽  
Coating Hardness

AbstractNi-based coatings can be successfully applied under abrasive and adhesive conditions as a substitute for environmentally harmful chrome coatings. The research has been carried out for thermally flame sprayed Ni-based coatings with remelting (so-called the two-step process) with the different chemical composition of starting powders. The structure of coatings was evaluated by optical and scanning electron microscopy. Both the three-body abrasive wear test, according to ASTM G65-4 (Dry-Sand Rubber Wheel Test) and dry sliding wear test by the Falex tester, were performed. The results show the influence of the effective chemical composition of the metal powders on improving the properties of the coating. The higher hardness of the coatings leads to a lower tendency for the creation of adhesive bonds, and as a result, leads to a lower tendency to scuffing. A similar trend shows the influence of higher coating hardness on the increasing of abrasive wear resistance.

IMPLEMENTASI MANAJEMEN KURIKULUM MADRASAH MUROTTILIL QUR’AN AL-RIFA’IE 2 MALANG

2019 ◽  
Vol 1 (1) ◽  
pp. 70
Author(s):  
Akhmad Ulul Albab
Keyword(s):  
Planning Process ◽  
Case Study Research ◽  
Field Research ◽  
Evaluation Process ◽  
Observation Time ◽  
Curriculum Planning ◽  
Research Approach ◽  
Learning Program ◽  
Planning Stage ◽  
Academic Calendar

This thesis aims to examine the management process applied in the Madrasah Murottilil Qur'an Al-Rifa'ie 2 Malang. Beginning with the curriculum planning process, implementing the curriculum, and how to evaluate the curriculum of the Madrasah Murottilil Qur'an Al-Rifa'ie 2 Malang. This research aims to find out and describe the managerial process of the curriculum, and the inhibiting factors in the implementation of efforts to achieve the vision, mission that has been set.This thesis is a report on the results of field research using a qualitative descriptive method with a case study research approach that takes place at the Al-Rifa'ie 2 Malang Boarding School.Data collection is done by interview, observation, and documentation. Data analysis is done by reducing data, then presenting data, and finally from the compiled data conclusions are drawn. Checking the validity of the data is done with credibility which includes Triangulation, peer checking, extension of observation time, increasing perseverance.The results of the analysis show that the curriculum management implemented by p Madrasah Murottilil Qur'an Al-Rifa'ie 2 At the planning stage, the process carried out was planning the implementation time, the learning program, making the academic calendar, and how the evaluation was held. At the implementation stage, it starts with a new santri test, conducts learning and conducts an ascension test. The evaluation process is carried out at least 2x in one month, and 1 and after one semester.

Efficiency of pay for performance program on the brazilian judiciary

2014 ◽  
Author(s):  
Luis Cláudio de Jesus-Silva ◽  
Antônio Luiz Marques ◽  
André Luiz Nunes Zogahib
Keyword(s):  
Performance Improvement ◽  
Pay For Performance ◽  
Field Research ◽  
The State ◽  
Quantitative Approach ◽  
The Internet ◽  
Court Of Justice ◽  
And Performance ◽  
Compensation Program ◽  
Structured Questionnaire

This article aims to examine the variable compensation program for performance implanted in the Brazilian Judiciary. For this purpose, a survey was conducted with the servers of the Court of Justice of the State of Roraima - Amazon - Brazil. The strategy consisted of field research with quantitative approach, with descriptive and explanatory research and conducting survey using a structured questionnaire, available through the INTERNET. The population surveyed, 37.79% is the sample. The results indicate the effectiveness of the program as a tool of motivation and performance improvement and also the need for some adjustments and improvements, especially on the perception of equity of the program and the distribution of rewards.

Tribological Properties of Calotropis Procera Natural Fiber Reinforced Hybrid Epoxy Composites

2019 ◽  
Vol 895 ◽  
pp. 45-51
Author(s):  
M.J. Raghu ◽  
Govardhan Goud
Keyword(s):  
Abrasive Wear ◽  
Glass Fibre ◽  
Sliding Wear ◽  
Natural Fiber ◽  
Wear Test ◽  
Calotropis Procera ◽  
Dry Sliding Wear ◽  
Wear Loss ◽  
Fiber Reinforced ◽  
Three Body

Natural fibers are widely used for reinforcement in polymer composite materials and proved to be effectively replacing synthetic fiber reinforced polymer composites to some extent in applications like domestic, automotive and lower end aerospace parts. The natural fiber reinforced composites are environment friendly, have high strength to weight ratio as well as specific strengths comparable with synthetic glass fiber reinforced composites. In the present work, hybrid epoxy composites were fabricated using calotropis procera and glass fibers as reinforcement by hand lay-up method. The fibre reinforcement in epoxy matrix was maintained at 20 wt%. In 20 wt% reinforcement of fibre, the content of calotropis procera and glass fibre were varied from 5, 10, 15 and 20 wt%. The dry sliding wear test as per ASTM G99 and three body abrasive wear test as per ASTM G65 were conducted to find the tribological properties by varying speed, load, distance and abrasive size. The hybrid composite having 5 wt% calotropis procera and 15 wt% glass fibre showed less wear loss in hybrid composites both in sliding wear test as well as in abrasive wear test which is comparable with 20 wt% glass fibre reinforced epoxy composite which marked very low wear loss. The SEM analysis was carried out to study the worn out surfaces of dry sliding wear test and three body abrasive wear test specimens.

Abrasive wear response of cryotreated EN45 steel in simulated wear test rig fixture

2015 ◽  
Vol 9 (3) ◽  
pp. 159-164 ◽  
Author(s):  
N. B. Dhokey ◽  
A. Raskar ◽  
A. R. Hake ◽  
G. Mohapatra
Keyword(s):  
Abrasive Wear ◽  
Wear Test ◽  
Test Rig ◽  
Wear Response

Analysis of Wear-Resistant Materials of Mixer - Pneumosuperchargers Blades Operating under Conditions of Abrasive Wear

2021 ◽  
Vol 316 ◽  
pp. 893-898
Author(s):  
Natalya Gabelchenko ◽  
Artem Belov ◽  
Artem Kravchenko ◽  
Oleg Kryuchkov
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Abrasive Wear ◽  
Abrasive Medium ◽  
Wear Resistant ◽  
Comparative Tests ◽  
Before And After ◽  
110G13l Steel

We conducted comparative tests of the wear resistance of metals operating under abrasive conditions. Samples were cut from the working parts of mixer-pneumosuperchargers. The chemical composition and mechanical properties were determined. To compare samples under abrasive wear conditions, we designed and assembled a carousel installation. The principle of its operation is based on mixing the abrasive medium by the samples being studied with a given speed. Wear resistance was evaluated by weight loss by samples after several test cycles. To determine changes in the structure of the metal during abrasive wear, metallographic studies of the samples were carried out before and after the tests. It is shown that the best complex of service and mechanical properties is possessed by 110G13L steel.

scholarly journals Service Assessment Planning for the Hunt Library Dataspace

2019 ◽  
Author(s):  
Mia Partlow ◽  
Karen Ciccone ◽  
Margaret Peak
Keyword(s):  
North Carolina ◽  
Statistical Analysis ◽  
Data Science ◽  
Planning Process ◽  
Service Development ◽  
State University ◽  
University Libraries ◽  
New Service Development ◽  
Data Intensive ◽  
Critical Data

Presentation given at TRLN Annual Meeting, Durham, North Carolina, July 1, 2019. The Hunt Library Dataspace was launched in August 2018 to provide students with access to the tools and support they need to develop critical data skills and perform data intensive tasks. It is outfitted with specialized computing hardware and software and staffed by graduate student Data Science Consultants who provide drop-in support for programming, data analysis, statistical analysis, visualization, and other data-related topics.Prior to launching the Dataspace the Libraries’ Director of Planning and Research worked with the Data & Visualization Services department to develop a plan for assessing the new Dataspace services. The process began with identifying relevant goals based on NC State University and the NC State University Libraries’ strategic priorities. Next we identified measures that would assess our success in relation to those goals. This talk describes the assessment planning process, the measures and methods employed, outcomes, and how this information will be used to improve our services and inform new service development.

scholarly journals Youth Employment Creation Factors in the EA Countries Data and Policy Analysis

2021 ◽  
pp. 13-29
Author(s):  
Semboja Haji Hatibu ◽  
Hafidh Ali Hafidh
Keyword(s):  
Planning Process ◽  
Labour Force ◽  
Policy Research ◽  
Field Research ◽  
Primary Data ◽  
Youth Employment ◽  
Fiscal Policies ◽  
Employment Creation ◽  
Job Opportunities ◽  
The Government

This policy research paper analyses employability factors contributing to youth unemployment and also provides working recommendations for further dialogue and engagement on youth employability in the EA countries. The data and policy analyses are based on the theory of 4-Es as propounded by International Labour Organization and Youth Employment Network literature. The field research survey, focus group discussion, combined observational and consultations with key informants were major research methods used in collecting secondary and primary data and other information. Data analysis used non-parametric methods, mainly frequency, and cross tabulations. The study found that the governments and private sectors have not created adequate, remunerative and sustainable job opportunities to match with increasing labour force within the country through effective utilization of natural resources available and improvement of production technology within the region. Diversification of the economy is limited. The government fiscal policies and other systems have not been effective in reducing unemployment for both youths with ought and with disability. The paper recommends optimal employment creation conditions. The proposed implementation strategies include creation of pro-economic growth job opportunities; diversification of the economy; creation of the environment conducive for fiscal policies adjustment; increasing participation of youth with disabilities in the job planning process and strengthening the institutional capacities.

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