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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To measure the wear, it is necessary to clean the specimens in such a way that the surface features are not altered. Test parameters to be reported should conform with either Procedure A or B. The friction coefficient data Table X1.
Statically applied loads shall be kept constant within a maximum asgm of This is essential to accurately study the trend of friction across the full length of the test.
Linear Wear Friction Testing ASTM G
The latter quantity requires more steps in order to obtain a? A block holder is used to hold the block.
Piston ring segment holder Comprehensive tribology testing plays an important role in automotive applications. In addition to contact testing of the piston ring and cylinder, UMTs can be used to examine their material finishing processes, the effect of normal force, and the use of different lubricants on friction and wear. The wear resulting from this mode of movement may differ from that experienced by the same materials sliding continuously in only one direction unidirectional sliding even for comparable durations of contact.
If a lubricant aatm used, provide its commercial name or other description, and any other properties needed to identify the source and traceability of the lubricant. This avoids making the assumption that the wear rate was constant during the test.
ASTM G – 05() Standard Test Method for Linearly Reciprocating Ball-on-Flat Sliding Wear
Information shall be sufficient to establish their source, chemical composition, processing history, surface treatment, 5 ast, Whitenton, E. 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. Since the repeatability and reproducibility of wear and friction data are material-dependent, a general statement for Procedures A or B cannot be made.
In a polished condition, the surface should y133 as free as possible from preparation artifacts such as grinding-induced cracks, gross grinding marks, and grain pull-out. A statement such as the following may then be used: This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Test Number 1 aztm 3 4 5 6 7 8 Flat Wear Volume, mm3 0. If neither procedure in 8. It is possible that during mounting, some contamination was inadvertently placed on them, and this?
Bruker Nano Surfaces, Tucson, Arizona Very few industries asrm as affected by strict test standards as the automotive sector. A cycle is de? InSight Measures Motion on Mars. Eight replicate tests were performed in one laboratory to evaluate the repeatability of this procedure.
Refer to the following which applies.
In this test, a block is loaded from the top and pressed against a rotating ring. A UMT can measure Vickers hardness and can be reconfigured to a linear test setup from rotary in minutes. 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: The values given in parentheses are for information only.
The test report should clearly indicate the manner in which friction force was obtained. In full immersion, liquid-lubricated tests, the bath temperature shall be measured and reported.
ASTM G133 – 05(2016)
The coefficient of variation for the friction coefficient in the same tests was 1. The coefficient of variation of the wear volume of the? Bath temperature shall be controlled to within a maximum deviation of Precision and Bias The ASTM G test method utilizes a flat lower specimen and a ball-shaped upper counterpart that slides against the flat specimen Figure 1.
The manner in which the velocity varies with time is determined by the design of the mechanism which drives the ball or? 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.
The test samples can be of varied shape such as cylindrical as long as there is a flat zone of a certain length in the direction of movement.
Tests include evaluation of base materials, heat-treated parts, surface coatings, and lubricants. The length of the track can be adjusted prior to the start of measurement. Temperature measurement and control capability is provided to heat and monitor the? The scope of this test method does 1g33 include testing in corrosive or chemically aggressive environments.
Linear Reciprocating (ASTM G133)
Current edition approved Nov. The load, stroke length, frequency of oscillation, temperature, condition asstm lubrication, and test duration are selected from one of the two procedures see Table.
A standard ring is installed on the arbor, which rotates in the horizontal axis. If procedures other than A or B are used, the report should explicitly state so, listing the conditions which are different than those described in 8.