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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The specimen materials were the same as those described in Table X1. Test Number 1 2 3 4 sstm 6 7 8 Flat Wear Volume, mm3 0. Precision and Bias A statement such as the following may then be used: The height of the specimen or mount may require adjustment to ensure that this condition is ful? In most cases, the width and depth of the wear scar on the? Becoming Compliant with the MDRs: The v133 load, stroke length, frequency and type of oscillation, test temperature, lubricant if anytest duration, and atmospheric environment including relative humidity range are selected from one of two procedures.
Friction force and normal force data are measured to obtain the coefficient of friction. The direction of the relative motion between sliding surfaces reverses in a periodic fashion such that the sliding occurs back and forth and in a straight line.
For the friction coefficient, the within-laboratory coefficient of variation was This avoids making the assumption that the wear rate was constant during the test. The latter quantity requires more steps in order to obtain a?
Stepper-type motors may also be used provided that the motion is smooth and uniform. The scope of this test method does not include testing in corrosive or chemically aggressive environments.
ASTM G – 05() Standard Test Method for Linearly Reciprocating Ball-on-Flat Sliding Wear
These numerical values for repeatability and reproducibility do not necessarily represent those quantities which would be obtained if other material combinations were tested 6 where: Summary of Test Method 4.
Photomicrographs of the scars should be included, if available.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. G — 02 and root-mean-square surface roughness. If wear is nonuniform, six cross-sectional pro? awtm
Wear rates for the tip and the sample are calculated from the volume of material lost. Automotive New fuel cell concept brings biological design to better electricity generation Briefs: Linear Wear Friction Process: If a cycle-counter is available, this may be used instead of the timer, in which case Eq 2 will be used.
Warning—For lubricated tests in which there is minimal wear, it is possible to be misled in reading the apparent wear scar diameter of the ball tip optically because of elastic recovery. Contact geometry, normal force, type of motion, temperature, surface?
Two wear tests were performed on each?
Commercial designations for materials should be given, if applicable. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. These specimens move relative to one another in a linear, back and forth sliding motion, under a prescribed set of conditions.
Since the direction of the friction force changes rapidly during the test, traditional strip-charttype recorders may be too slow to follow these changes at high frequencies of reciprocation.
A block holder is used to hold the block. For liquid-lubricated specimens, zstm cleaning in a suitable solvent asttm be used. UMTs offer interchangeable modules and the ability to program and control the application of complex forces and motions through servo-control. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
If a lubricant is used, provide its commercial name or other description, and any other aztm needed to identify the source and traceability of the lubricant. Either of two sets of testing conditions designated Procedures A and B may be used. The ball is rigidly mounted and has a spherical tip which moves back and forth across the surface of a polished?
Since the repeatability and reproducibility of wear and friction data are material-dependent, a general statement for Procedures A or B cannot be made. Linear astj friction test reproduces the linear reciprocating motion found in many real-world tribology mechanisms.
A v133 is made for applying a uniform normal force load to g1333 contact between the ball and the? To determine the change in wear rate with test duration, interrupted tests with periodic wear volume assessments may be made.
Linear Reciprocating (ASTM G133)
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NOTE 2—This procedure requires full-immersion lubrication. Nominal friction coefficient values were obtained from chart recordings of the root-mean-square friction force. Plane Flies with No Moving Parts.