A Detailed Proposal for an Oxidation Test for Flexible Graphite

2017 ◽  
Author(s):  
Stephen Bond
Keyword(s):  
Test Methods ◽  
Standard Test ◽  
Ash Content ◽  
Factors Affecting ◽  
Oxidation Rates ◽  
Oxidation Performance ◽  
Flexible Graphite ◽  
Vast Range ◽  
Standard Tests ◽  
Modern Standard

While the oxidation of graphite in gaskets is a well known phenomenon it is often poorly quantified and the factors affecting it not always well known. There are some standard tests that can be used to determine graphite quality. While many of these material standards concentrate on the compositional impurities (sulfur, chlorides etc.) and the ash content; these are indicative of other properties and they are no real indication of oxidation performance. Recently, some test methods have been published that suggest a method for measuring oxidation performance; however, they have some shortcomings or constraints. Using modern, standard TGA (ThermoGravimetric Analysis), the work presented in this paper aims to provide a more detailed standard test that can be used to measure the oxidation rate of graphite in flowing air for a given set of time and temperature conditions. The paper will show what other conditions are critical and which are less significant in specifying a standard test. This will lead to the presentation of a suggestion for an improved standard test that builds on and further codifies the tests currently published. Finally, this paper will show the oxidation rates of a variety of different commercial graphite grades to illustrate the vast range of oxidation rates that are possible from the various grades of graphite.

scholarly journals Assessment of metals fabricability by pressure

2020 ◽  
Vol 63 (6) ◽  
pp. 481-483
Author(s):  
G. A. Orlov ◽  
A. G. Orlov
Keyword(s):  
Mechanical Properties ◽  
Metal Forming ◽  
Quantitative Assessment ◽  
Energy Intensity ◽  
Test Methods ◽  
Standard Test ◽  
Geometrical Mean ◽  
Data Estimation ◽  
Standard Tests ◽  
Made In

A variant of quantitative assessment of metals fabricability by pressure is offered according to the standard tests on mechanical properties. The complex parameter is used, defined as geometrical mean of three parameters characterizing plasticity, hardening and energy intensity of alloys deformation. Relations of scientific and engineering characteristics of deformability assessment for the use of scientific researches results in factory practice are determined, being guided on the standard test methods. Examples of the use of received equations are resulted for a number of steels in processes of metal forming. Testing of the proposed method was carried out according to the known data. Estimation of the complex parameters was made in accordance with Harrington desirability scale. The offered technique can be used for an assessment of fabricability of new steels and alloys.

Some Factors Affecting Cement Mortar Strength Results Using ASTM Standard Test Methods C 348 and C 349

1973 ◽  
Vol 1 (1) ◽  
pp. 31
Author(s):  
SF Etris ◽  
KC Lieb ◽  
VK Sisca ◽  
IC Moore ◽  
AL Batik ◽  
...  
Keyword(s):  
Cement Mortar ◽  
Test Methods ◽  
Standard Test ◽  
Factors Affecting ◽  
Astm Standard ◽  
Mortar Strength

scholarly journals Studying the influence of the preparation of a new copolyamide as adhesive for wood-wood surfaces

2019 ◽  
Vol 17 (72) ◽  
pp. 109-116
Author(s):  
Mohammad N. AL-Baiati
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Impact Strength ◽  
Wood Adhesive ◽  
Test Methods ◽  
Standard Test ◽  
The Other ◽  
Adhesion Properties ◽  
Wood Surfaces ◽  
Standard Tests

In this research, a new copolyamid was prepared from reaction Aceglutamide with Formaldehyde by esterfication process, and used this copolymer as adhesive between wood – wood surface. Five different weight ( 0.2, 0.4 , 0.6, 0.8 & 1.0 gm ) from the prepared copolymer respectively, were used as adhesive to prepared the specimens of wood / adhesive . Four standard test methods were used to measured the adhesion properties which are; ASTM: D-790, ASTM: D- 695,  ISO – 179                   &   ASTM: D-638 . The results obtained from these tests indicated that, the specimens of               wood / adhesive containing 1.0 gm from the prepared copolymer have high values in all standard tests; Impact strength was 45 MPa, Compressive strength was 40 MPa, Flexural strength was 250 MPa and Tensile strength was 8150.41 MPa ; compared with the other specimens which contain on less weight from the prepared copolymer.

scholarly journals Comparison of Two Intergranular Corrosion Tests on EN AW-6016 Sheet Material

2021 ◽  
Vol 11 (11) ◽  
pp. 5294
Author(s):  
Peer Decker ◽  
Ines Zerbin ◽  
Luisa Marzoli ◽  
Marcel Rosefort
Keyword(s):  
Optical Microscopy ◽  
Intergranular Corrosion ◽  
Sheet Material ◽  
Test Methods ◽  
Standard Test ◽  
Corrosion Depth ◽  
Corrosion Tests ◽  
Automotive Company ◽  
Test Parameters

Two different intergranular corrosion tests were performed on EN AW-6016 sheet material, an ISO 11846:1995-based test with varying solution amounts and acid concentrations, and a standard test of an automotive company (PV1113, VW-Audi). The average intergranular corrosion depth was determined via optical microscopy. The differences in the intergranular corrosion depths were then discussed with regard to the applicability and quality of the two different test methods. The influence of varying test parameters for ISO 11846:1995 was discussed as well. The determined IGC depths were found to be strongly dependent on the testing parameters, which will therefore have a pronounced influence on the determined IGC susceptibility of a material. In general, ISO 11846:1995 tests resulted in a significantly lower corrosion speed, and the corrosive attack was found to be primarily along grain boundaries.

scholarly journals Evaluation of Bleeding Resistance in Chip Seal and Asphalt Emulsion Residue Rheology

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 670
Author(s):  
Preeda Chaturabong
Keyword(s):  
Influence Factors ◽  
Application Rate ◽  
Test Methods ◽  
Test Results ◽  
Asphalt Emulsion ◽  
Aggregate Gradation ◽  
Factors Affecting ◽  
Promising Tool ◽  
Chip Seal ◽  
Asphalt Emulsions

Chip seal bleeding is influenced by many factors, including design inputs, material properties, and project-specific conditions. It reduces the surface texture of the pavement and thus compromises the safety of the traveling public. Even though factors that bring about premature bleeding are known, currently, no laboratory test methods for evaluating bleeding in chip seals have been specified. The objective of this paper is to present the results of an investigation of the influence factors of asphalt emulsion residue properties measured by the ASTM D7405 multiple stress creep and recovery (MSCR) test, as well as other factors related to chip seal bleeding resistance as measured by the modified loaded wheel test (MLWT). In this study, the MSCR test was used as a tool for evaluating the performance of asphalt emulsions because it has been identified as a potential test related to bleeding in the field. In addition, MLWT was selected as a tool for evaluating chip seal bleeding performance in the laboratory. The results of the MLWT showed that the emulsion application rate (EAR), aggregate gradation, and emulsion properties were significant factors affecting bleeding. The MSCR test was found to be a promising tool for the performance evaluation of asphalt emulsion residue, as the test was able to differentiate between emulsion chemistries and modifications in terms of sensitivity to both temperature and stress. In relation to chip seal bleeding resistance, only the creep compliance (Jnr) obtained from the MSCR test results was identified as a significant property affecting potential for bleeding.

Serviceability Assessment of a Printed Finish on T-Shirts

2021 ◽  
Vol 8 (2) ◽  
pp. 48-53
Author(s):  
Reannan Riedy ◽  
Meredith McQuerry
Keyword(s):  
Abrasion Resistance ◽  
Dimensional Change ◽  
Test Methods ◽  
Standard Test ◽  
Performance Expectations ◽  
Agricultural Worker ◽  
Soil Release ◽  
And Performance ◽  
Typical Consumer ◽  
Change Material

To improve the comfort of agricultural workers, a T-shirt with a printed active cooling finish was evaluated to determine if it would meet the wash life durability and performance expectations of such an arduous application. Six shirts with a printed phase change material (PCM) finish and six shirts without (control) were washed 50 times to replicate a typical consumer wash life. Shirts were evaluated for absorbency, dimensional change, colorfastness, crocking, abrasion resistance, soil release, and smoothness retention according to AATCC and ASTM standard test methods. Testing was conducted before laundering and after 1, 5, 10, 20, 30, 35, 40, 45, and 50 consumer laundry (CL) cycles. Absorbency and dimensional change were significantly influenced by the PCM finish. Results demonstrate the appropriateness of adopting such a finish technology for agricultural worker clothing applications.

Development of standard test methods for unmanned and manned industrial vehicles used near humans

2013 ◽  
Author(s):  
Roger Bostelman ◽  
Richard Norcross ◽  
Joe Falco ◽  
Jeremy Marvel
Keyword(s):  
Test Methods ◽  
Standard Test

scholarly journals A psychological analysis of factors affecting acute pain in postoperative patients

2019 ◽  
Vol 129 (1) ◽  
pp. 9-12
Author(s):  
Lilia Suchocka ◽  
Kazimierz Popielski ◽  
Małgorzata Pasek
Keyword(s):  
Acute Pain ◽  
Subjective Experience ◽  
Test Methods ◽  
Mcgill Pain Questionnaire ◽  
Factors Affecting ◽  
Future Goals ◽  
Psychological Analysis ◽  
Preoperative Stage ◽  
Experienced Pain ◽  
Study Results

Abstract Introduction. The most frequent type of acute pain is the postoperative pain. The postoperative situation consists of three stages: the preoperative stage, the surgical phase, and the postoperative stage. Each of the stages is equally important, and it is crucial that medical staff should minimize the stress and discomfort related to hospitalization. Specialists suggest that the preparation to surgery should correspond to the patient’s style of responding to stress. The level of individually experienced pain depends not only on the type of surgery, but also on psychological factors and the patient’s personality traits. Aim. The aim of the study was to analyze the factors that affect the experience of acute pain in postoperative patients. Material and methods. The study was conducted in Lublin, Poland, and comprised 100 patients of the local surgical wards. After incomplete tests were excluded, the group of 68 patients (37 women and 31 men, aged 20-73) was selected. The following test methods were used: The McGill Pain Questionnaire (MPQ) by R. Melzack, Test Noo-dynamiki [The Test of Noo-Dynamics] (T.N-D) by K. Popielski, Kwestionariusz Poczucia Odpowiedzialności [The Sense of Responsibility Questionnaire] (KPO) by L. Suchocka, The IPAT Anxiety Scale Questionnaire (Self Analysis Form) by R.B. Cattell. Results. The study results show that the evaluation of pain is affected, at the statistically significant level, by the patients’ subjective experience of feeling ill, their surgery-related discomfort, and the intensity of pain. The patients who are not oriented towards future goals and tasks, closing upon themselves, evaluate the postoperative situation as difficult and distressing. The orientation towards new goals motivates the patients to fast recovery. Conclusion. The test results confirmed the research hypotheses. The study findings may be useful for medical professionals interested in the functioning of an individual in the situation of disease.

Sign in / Sign up

Export Citation Format

Share Document