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ASTM E471-22
Standard Test Method for Obtaining Char Density Profile of Ablative Materials by Machining and Weighing
Přeložit název
NORMA vydána dne 1.8.2022
Informace o normě:
Označení normy: ASTM E471-22
Datum vydání normy: 1.8.2022
Kód zboží: NS-1070831
Počet stran: 3
Přibližná hmotnost: 9 g (0.02 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM E471-22 :
This test method covers the determination of the char density profile of a charred ablator. The total thickness of the char and degradation zone must be larger than the machining thicknesses required. Density variation throughout a charred ablator material is determined by successively measuring, machining, and weighing a sample of known size to obtain the density of the material removed by machining. The apparatus required for this method includes a laboratory balance capable of measuring to the nearest ten thousandth gram, and a machining technique capable of removing material in increments as small as a thousandth mm.
Keywords:
ablation, char density, density profile ,, ICS Number Code 49.025.40 (Rubber and plastics)
Doplňující informace
| 1. Scope |
|
1.1?This test method covers the determination of the char density profile of a charred ablator that can be used with the following limitations: 1.1.1?The local surface imperfections must be removed, and the char must be able to be machined off in a plane parallel to the char-virgin material interface before the density profiles can be determined. 1.1.2?The char must be strong enough to withstand the machining and handling techniques employed. 1.1.3?The material should have orderly density variations. The total thickness of the char and degradation zone must be larger than the machining thicknesses required. 1.2?UnitsThe values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1?ExceptionCertain inch-pound equivalent units are included in parentheses for information only. 1.3?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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