Astm G99 05 Pdf Free
ASTM G99-05: A Standard Test Method for Wear Testing with a Pin-on-Disk Apparatus
Wear is a phenomenon that occurs when two surfaces slide against each other, resulting in material loss, friction, and heat generation. Wear can affect the performance, reliability, and durability of mechanical components and systems. Therefore, it is important to measure and evaluate the wear behavior of materials under different conditions.
One of the methods for wear testing is the pin-on-disk test, which involves a pin (or ball) sliding on a rotating disk. The pin and the disk are made of the materials to be tested, and the wear is measured by the mass loss, volume loss, or wear depth of the pin or the disk. The pin-on-disk test can simulate various types of wear mechanisms, such as adhesive wear, abrasive wear, and oxidative wear.
astm g99 05 pdf free
The ASTM G99-05 is a standard test method for wear testing with a pin-on-disk apparatus, issued by the American Society for Testing and Materials (ASTM). This standard specifies the apparatus, test specimens, test procedure, and calculations needed to perform a pin-on-disk wear test. The standard also provides guidance on how to report and interpret the test results.
The Apparatus
The pin-on-disk apparatus consists of a pin holder, a disk holder, a loading device, a drive system, an environmental chamber, and a measuring device. The pin holder is used to hold the pin specimen in contact with the disk specimen. The disk holder is used to support and rotate the disk specimen at a constant speed. The loading device is used to apply a normal load on the pin specimen. The drive system is used to control the speed and direction of rotation of the disk specimen. The environmental chamber is used to maintain a desired temperature and humidity during the test. The measuring device is used to measure the mass, volume, or depth of wear of the pin or the disk specimen.
The Test Specimens
The test specimens are cylindrical pins or balls and disks made of the materials to be tested. The dimensions and surface finish of the specimens should be specified according to the test objectives and conditions. The specimens should be cleaned and weighed before and after the test.
The Test Procedure
The test procedure involves the following steps:
Mount the pin and disk specimens on the pin holder and disk holder, respectively.
Set the desired normal load, sliding speed, sliding distance, and environmental conditions.
Start the test by bringing the pin specimen in contact with the disk specimen and rotating the disk specimen at a constant speed.
Stop the test after reaching the predetermined sliding distance or time.
Remove the pin and disk specimens from the apparatus and clean them.
Measure the mass, volume, or depth of wear of the pin or disk specimen.
The Calculations
The calculations involve the following parameters:
The mass loss (Δm) or volume loss (ΔV) of the pin or disk specimen.
The wear rate (k) of the pin or disk specimen, defined as Δm/L or ΔV/L, where L is the sliding distance.
The specific wear rate (K) of the pin or disk specimen, defined as k/F or k/P, where F is the normal load or P is the contact pressure.
The coefficient of friction (μ) between the pin and disk specimens, defined as F/T or F/Wr, where T is the tangential force or W is the weight of the pin specimen and r is its radius.
The Reporting and Interpretation
The reporting and interpretation of the test results should include:
A description of the apparatus, test specimens, test procedure, and calculations used in accordance with ASTM G99-05.
A presentation of the mass loss, volume loss, wear rate, specific wear rate, coefficient of friction, and other relevant data as graphs or tables.
A discussion of the wear mechanisms, wear modes, wear maps, wear transitions, wear regimes, and other wear phenomena observed or inferred from the test results.
A comparison of the test results with other data from literature or experiments under similar or different conditions.
A conclusion and recommendation based on the test objectives and findings.
Where to Find ASTM G99-05 PDF Free?
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