Ermittlung der Unsicherheit von Prüfergebnissen – Beispiele aus der chemischen Analytik und der Materialprüfung an der BAM (Evaluating the Uncertainty of Test Results – Examples from Chemical Analysis and Materials Testing at BAM)

2001 ◽  
Vol 68 (11/2001) ◽  
Author(s):  
W. Daum ◽  
W. Hässelbarth ◽  
S. Noack ◽  
Andreas Subaric-Leitis
Keyword(s):  
Chemical Analysis ◽  
Materials Testing ◽  
Test Results

scholarly journals Quantitative Evaluation of Crystalline and Amorphous Phases in Clay-Based Cordierite Ceramic

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1122
Author(s):  
Zdeněk Klika ◽  
Marta Valášková ◽  
Lucie Bartoňová ◽  
Petra Maierová
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Analysis ◽  
Test Results ◽  
Mineral Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Phases ◽  
Cordierite Ceramic ◽  
Scanning Electron

An innovative chemical quantitative mineral analysis (CQMA) was successfully tested on a cordierite-based clay ceramic sample to quantify crystalline and amorphous components. The accuracy of this method was demonstrated on an added module to the CQMA program that used oxide formulas of amorphous phases obtained by energy dispersive X-ray spectroscopy (EDS) microprobe chemical analysis. This CQMA method was tested for three variants calculated using chemical analysis, i.e., X-ray diffraction (XRD) identification of crystalline (cordierite and enstatite) and amorphous phases by scanning electron microscopy (SEM)/EDS texture and microanalyses. The test results from CQMA suggest their application possibilities as well as the limits of their utilization.

Characterization of a Ferritic Stainless Sheet Steel in Simple Shear and Uniaxial Tension at Different Strain Rates

2011 ◽  
Author(s):  
Matti Isakov ◽  
Jeremy Seidt ◽  
Kauko O¨stman ◽  
Amos Gilat ◽  
Veli-Tapani Kuokkala
Keyword(s):  
Uniaxial Tension ◽  
Simple Shear ◽  
High Strain ◽  
Image Correlation ◽  
Materials Testing ◽  
Strain Rates ◽  
Test Results ◽  
High Strain Rates ◽  
Stress Strain

In this study the mechanical properties of ferritic stainless steel EN 1.4521 (AISI 444) were characterized in uniaxial tension and simple shear. The specimen geometries were designed so that tests could be carried out both with a conventional uniaxial materials testing machine and at high strain rates with the Tensile Hopkinson Split Bar method. During the tests, specimen surface deformation was measured using a three dimensional digital image correlation technique based on a two-camera stereovision setup. This technique allowed direct measurement of the specimen gauge section deformation during the test. Test results indicate that the selected approach is suitable for large strain plastic deformation characterization of ductile metals. The stress-strain data obtained from the simple shear tests shows a correlation with the tensile test results according to the von Mises effective stress-strain criterion. Since necking is absent in shear, test data can be obtained at considerably higher plastic strains than in tension. However, the final fracture occurs under a complex loading mode due to the distortion of the specimen geometry and multiaxial loading introduced by the simple shear arrangement. Test results also show that reliable material data can be obtained at high strain rates.

Current patch test results in consecutive patients with, and chemical analysis of, disperse blue (DB) 106, DB 124, and the mix of DB 106 and 124

2007 ◽  
Vol 57 (4) ◽  
pp. 230-234 ◽  
Author(s):  
Wolfgang Uter ◽  
Stephan Hildebrandt ◽  
Johannes Geier ◽  
Axel Schnuch ◽  
Holger Lessmann
Keyword(s):  
Chemical Analysis ◽  
Patch Test ◽  
Test Results

The Research on Comparison and Conversion of Two Friction Materials Testing Standards

2013 ◽  
Vol 333-335 ◽  
pp. 1876-1879
Author(s):  
Jian Yu Wei ◽  
Jian Lu ◽  
Qi Bin Liu ◽  
Feng Wu ◽  
Feng Wang
Keyword(s):  
Bp Neural Network ◽  
Materials Testing ◽  
Nonlinear Relationship ◽  
Test Results ◽  
Friction Materials ◽  
Test Specifications ◽  
Relationship Model ◽  
Model Of Friction ◽  
Testing Standards ◽  
Bp Model

In this paper, the BP neural network nonlinear relationship model of friction coefficient between the GB5763-98 standards and SAEJ661 test specifications has been built, and the model was trained. The prediction results show that by the BP model: forecasts and actual test results are basic agreement; the error size is not more than 0.1.

The Analysis on Materials Testing Network of Ecology Environment

2012 ◽  
Vol 427 ◽  
pp. 179-184
Author(s):  
Xin Chun Fang ◽  
Jian Zhong Sun ◽  
Rui Ping Kong ◽  
Lu Kui Shi
Keyword(s):  
Network Performance ◽  
Functional Materials ◽  
Test Methods ◽  
User Needs ◽  
Materials Testing ◽  
Network Technology ◽  
Test Results ◽  
Testing Methods ◽  
Network Testing ◽  
Balance Testing

As the network technology is widely used in the functional materials test of ecology environment, it becomes more and more important to balance testing network performance fast and accurately. However, there are so many network testing methods with a variety of user needs and different scopes. If we use these test methods indiscriminately, time and money is largely consumed, and the testing results often cannot meet user's requirements. Thus, while testing the network performance, in order to accelerate the speed of the material testing, and ensure the quality and the accuracy of test results, characteristics and user's requirements must be selected and improved.

Shoe contact dermatitis from dimethyl fumarate: clinical manifestations, patch test results, chemical analysis, and source of exposure

2009 ◽  
Vol 61 (5) ◽  
pp. 249-260 ◽  
Author(s):  
Ana Giménez-Arnau ◽  
Juan Francisco Silvestre ◽  
Pedro Mercader ◽  
Jesus De la Cuadra ◽  
Isabel Ballester ◽  
...  
Keyword(s):  
Contact Dermatitis ◽  
Chemical Analysis ◽  
Patch Test ◽  
Clinical Manifestations ◽  
Dimethyl Fumarate ◽  
Test Results

Analysis of Field Data From the Performance of Offshore Pipelines (POP) Project

2002 ◽  
Author(s):  
Robert Bea ◽  
Charles Smith ◽  
Bob Smith ◽  
Johannes Rosenmoeller ◽  
Thomas Beuker ◽  
...  
Keyword(s):  
Material Properties ◽  
Field Data ◽  
Field Testing ◽  
Government Agency ◽  
Materials Testing ◽  
Test Results ◽  
Offshore Pipelines ◽  
Oil Pipeline ◽  
Laboratory Test Results ◽  
Three Stages

The Performance of Offshore Pipelines (POP) joint industry – government agency sponsored project was conceived to test pipelines in the field to allow verification of procedures used to analyze their potential loss of containment characteristics. This paper summarizes a series of analyses performed to predict the loss of containment (LOC) characteristics of one pipeline in the Gulf of Mexico. The oil pipeline tested had been in service for 22 years and was scheduled for removal. The pipeline was in-line instrumented, and then hydro-tested to failure. The failure section and other sections of the pipeline that had indicated significant corrosion features were retrieved and the geometric and material properties of the failure section and the other sections determined. LOC pressure forecasts were done in three stages: 1)before field testing, 2)after in-line instrumentation was performed and the data analyzed, and 3)after geometry measurements and materials testing. The LOC pressure and location determined during the field test were not released to the analysts until after all of the forecasts were completed and documented. This paper summarizes the results from the analyses of the field and laboratory test results to forecast the LOC pressure and compares the forecasts with the hydro-test results.

scholarly journals A New Method of Testing the Dynamic Deformation of Metals

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3317
Author(s):  
Jacek Pawlicki ◽  
Zbigniew Stanik ◽  
Adam Płachta ◽  
Andrzej Kubik
Keyword(s):  
Dynamic Deformation ◽  
Construction Materials ◽  
Measuring System ◽  
Materials Testing ◽  
Test Results ◽  
The Finite Element Method ◽  
Short Term ◽  
Bending Tests ◽  
Dynamic Materials ◽  
Energy Consuming

This paper presents the characteristics of a modernized rotary hammer equipped with a new measuring system based on strain gauges for recording short-term signals. The stand makes it possible to carry out dynamic tensile and bending tests in the range of linear speed of the exciting element from 5 to 40 m/s. Initial tests of dynamic deformation and structural studies in the form of fractures carried out on a representative group of metallic materials allowed determining the correlation “strain rate–strain structure”. The proposed new methodology of dynamic materials testing is an original achievement of the authors and may be an effective tool for assessing the properties of construction materials under conditions of dynamic deformation. In practice, the test results can be used to design the structures of energy-consuming elements of vehicles and aircraft load-bearing elements subjected to dynamic loads. Having an extensive database of results from dynamic tests will allow verifying the correctness of calculations of the structure with the use of the finite element method.

Corrosion of Dry - Bottom Boiler Evaporator in Power Industry

2015 ◽  
Vol 818 ◽  
pp. 129-132
Author(s):  
Robert Maršál ◽  
Jitka Podjuklová ◽  
René Siostrzonek ◽  
Daniela Pavelková ◽  
Lenka Koldová ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Power Plant ◽  
Chemical Analysis ◽  
Laboratory Test ◽  
Chemical Stabilization ◽  
Test Results ◽  
Boiler Water ◽  
Chemical Balance ◽  
Laboratory Test Results ◽  
Non Destructive

This contribution solves the character of corrosive damage of the tubes, steam generating tubes of dry-bottom boiler combustion chamber in power plant engineering, and deals with the aspects related to the corrosion criteria of the carbon steel. The laboratory test results of samples applied on tubes that were subject to non-destructive and destructive tests are analyzed in one part of the work. The samples of greater incidence of corrosion products, which caused the failure of the integrity of the steam generating tubes, were tested. The work deals in details with the results of laboratory and chemical analysis of boiler water from the previous periods. The thesis evaluates the amount and frequency of P2O5 dosing cycles. The work also deals with the proposal of corrective measures that shall lead to the chemical balance of the boiler water. It proposes a continuous correlation methodology for chemical stabilization.

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