Cookies
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“.
ASTM D3702-94(2019)
Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine
NORMA vydaná dňa 1.5.2019
Informácie o norme:
Označenie normy: ASTM D3702-94(2019)
Dátum vydania normy: 1.5.2019
Kód tovaru: NS-952839
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D3702-94(2019) :
Keywords:
coefficient of friction, self-lubricated, torque, wear, wear-rate,, ICS Number Code 19.060 (Mechanical testing)
Doplňujúce informácie
| Significance and Use | ||
|
4.1 This test method is used to determine the equilibrium rate of wear and coefficient of friction of materials in rubbing contact under useful operating conditions, that is, combinations of pressure and velocity that fall below the 4.2 Test conditions may be selected from Table 1. |
Acetal homopolymer at PV1: | 5 × 10−6 in./h to 1 × 10−5 in./h (1.3 × 10−7 m/h to 2.5 × 10−7 m/h) |
| Acetal homopolymer at PV2: | 1 × 10−5 in./h to 3 × 10−5 in./h (2.5 × 10−7 m/h to 7.5 × 10−7 m/h) | |
| 22 % PTFE-filled acetal homopolymer at PV2: | 3 × 10−6 in./h to 6 × 10−6 in./h (7.5 × 10−8 m/h to 1.5 × 10−7 m/h) | |
| Polyamide (Type 6-6) at PV2: | 1 × 10−5 in./h to 5 × 10−5 in./h (2.5 × 10−7 m/h to 1.3 × 10−6 m/h) | |
| 15 % graphite filled polyimide restin at PV3: | 1 × 10−5 in./h to 2 × 10−5 in./h (2.5 × 10−7 m/h to 5 × 10−7 m/h) |
4.3 The precision of wear measurement is relatively independent of test duration or amount of wear, but the precision of wear rate (calculation) improves with test duration and amount of wear. It is generally believed that useful wear rate precision requires the selection of a test duration sufficient to produce 0.1 mm (0.004 in.) of wear. Test durations will often be in the 50 h to 4000 h range.
1.1 This test method covers the determination of wear rate and coefficient of friction for self-lubricated materials in rubbing contact by a testing machineNote 1: This machine may also be used to measure coefficient of friction.
1.2 The values in SI units are to be regarded as the standard. In cases where materials, products, or equipment are available only in inch-pound units, SI values in parentheses are 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.
