Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials
Automaticky preložený názov:
Štandardná skúšobná metóda pre Rockwell Tvrdosť plastov a elektrických izolačných materiálov
NORMA vydaná dňa 1.10.2015
Označenie normy: ASTM D785-08(2015)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.10.2015
Kód tovaru: NS-616774
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
electrical insulating materials, indentation hardness, plastic molding, plastic sheets, Rockwell alpha hardness, Rockwell hardness, Rockwell hardness number,, ICS Number Code 29.035.20 (Plastic and rubber insulating materials)
Significance and Use | |||||||||||||||||||||||
4.1 A Rockwell hardness number is a number derived from the net increase in depth impression as the load on an indenter is increased from a fixed minor load to a major load and then returned to a minor load (Procedure A). A Rockwell alpha (α) hardness number represents the maximum possible remaining travel of a short-stroke machine from the net depth of impression, as the load on the indenter is increased from a fixed minor load to a major load (Procedure B). Indenters are round steel balls of specific diameters. Rockwell hardness numbers are always quoted with a scale symbol representing the indenter size, load, and dial scale used. This test method is based on Test Methods E18. Procedure A (Section 11) yields the indentation of the specimen remaining 15 s after a given major load is released to a standard 10-kg minor load. Procedure B (Section 12) yields the indentation of the indenter into the specimen after a 15-s application of the major load while the load is still applied. Each Rockwell scale division represents 0.002-mm (0.00008-in.) vertical movement of the indenter. In practice, the Rockwell hardness number is derived from the following relationship:
Podobné normy: Historická Historická Historická Historická Historická Historická Posledná aktualizácia: 2024-05-07 (Počet položiek: 2 897 585) |