The linear wear test, ASTM G, reproduces the linear reciprocating motion found in many real-world tribology mechanisms. ASTM G – Designation: G – 02 Standard Test Method for Linearly Reciprocating Ball-on-Fla. ASTM G – – Download as PDF File .pdf), Text File .txt) or read online. ASTM G –
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Linear wear friction test reproduces the linear reciprocating motion found in many real-world tribology mechanisms. New fuel cell concept brings biological design to better electricity Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
To compute the sliding distance in metres xstm number of cycles, use the following: As the test starts, the tip creates a linear wear track zigzag pattern also possible. The load, stroke length, frequency of oscillation, temperature, condition of lubrication, and test duration are selected from one of the two procedures see Table. aatm
This avoids making the assumption that the wear rate was constant during the test. Also, report any unusual frictional behavior, as indicated in Commercial designations for materials should be given, if applicable.
Another critical automotive test is for friction and wear at the piston ring and cylinder interface. The tangential force can be measured continuously during oscillating contact and used to obtain friction coefficient data.
In full immersion, liquid-lubricated tests, the bath temperature shall be measured and reported. A fresh supply of lubricant shall be used for each test unless the objective f133 to evaluate the effects of used lubricants on friction and wear. Link to Active This link will always route to the current Active version of the standard.
The velocity of movement follows a sine wave with maximum speed in the middle of the track.
Linear Reciprocating (ASTM G133)
Test parameters to be reported should conform with either Procedure A or B. Either of two sets of testing conditions designated Procedures A and B may be used. The height of the specimen or mount may require adjustment to ensure that this condition is ful? Friction coefficient is accurately measured during the test by the deflection of, the easy and quick to calibrate, load cell. A calibrated ocular or a photomicrograph of known magni?
To determine the change in wear rate with test duration, interrupted tests with periodic wear volume assessments may be made. Test Number 1 2 3 4 5 6 7 8 Friction Coefficient,? Contact geometry, normal force, type of motion, temperature, surface? Eo is obtained from: For example, it may start high then experience a transition to a lower value during the test.
Photomicrographs of the scars should be included, if available.
Plane Flies with No Moving Parts. A standard ring is installed on the arbor, which rotates in the horizontal axis.
Generally, in calculating wear volume of the? It has been estimated that half or more of the friction losses in internal combustion engines occur at that interface, making friction tests of those areas critical. Because of the integrated 16bit external position encoder, friction can be displayed for any specific point for each pass.
Universal Mechanical Testers for Tribology Testing in the Automotive Industry – Tech Briefs
If friction never reaches a steady value, its range of values may be reported with appropriate notations as to its behavior. Crankshafts and camshafts are often evaluated with the block-on-ring test as defined in the ASTM G77 standard.
A provision is made for applying a uniform normal force load to the contact between the ball and the?
Depending on the machine, a? The ball specimen experiences nominally constant contact, whereas asm Additional guidelines for reporting data are found in Guide G Subscribe to our Newsletter and stay updated!
Last previous edition approved in as G —95 e1. Test Number 1 2 3 4 5 6 7 8 Flat Wear Volume, mm3 0. Two wear tests were performed on each? The ball holder should be rigid enough so that the wstm reversal in the sliding direction does not result in tilting or other misalignment of the contact.