Wear rate is volume loss per unit distance and its unit is (m3/m). it is independent of load applied.
Specific wear rate depends on applied on to cause wear, it is volume loss per unit meter per unit load. Its unit is (m3/Nm).
I found these equation in springer hand book of Materials measurement methods
wear amount = mass loss (kg) or,
=linear dimensional change (m) or,
= volume loss (m3).
wear resistance = 1/(wear amount) (m−1,m−3, kg−1).
wear rate=(wear amount)/(sliding distance or time) (m/m, m3/m, kg/m, m/s, m3/s, kg/s).
wear coefficient, or specific wear rate (also sometimes called wear factor) = (wear rate)/(normal force) (m3 N−1m−1).
specific wear depends on mass loss, desity, load and sliding distnce. its unit is mm3/Nm.
Wear rate is volume loss per unit distance and its unit is (m3/m). it is independent of load applied.
Specific wear rate depends on applied on to cause wear, it is volume loss per unit meter per unit load. Its unit is (m3/Nm).
Wear rate is load independent. Specific wear rate is load dependent.
Specific wear rate is more accurate description of the wear characteristics of any materials, particularly for metals, alloys, and composites. It is used as a precision indication of the wear properties of the sliding bodies under Loads, speeds, and sliding distance or time. You can say it is a tool to describe a specific property. Using the weigh t loss for describing the wear rate is not accurate at all.
Wear rate is volume loss per unit distance and its unit is (m3/m). it is independent of load applied.
Specific wear rate depends on applied on to cause wear, it is volume loss per unit meter per unit load. Its unit is (m3/N.m).
Moreover, the characteristics and type of materials ( particularly for metals, alloys, and composites), it will affect the wear rate like density,...
Dear Manjunatha Ss,
Wear rate is volume loss per unit distance and its unit is (m3/m). it is independent of load applied. Specific wear rate depends on applied on to cause wear; it is volume loss per unit meter per unit load. Its unit is (m3/Nm). Both Researcher Archard in 1953 who defined both term specifically with calculation.
Wear rate
A common used equation to compute the wear rate is (Archard,1953).
1. Vi =ki F s.
2. The k-value is given in m3/Nm or m2/N, sometimes in mm3/Nm. ...
3. hi =ki P S.
4. The sliding distance S can be replaced by S=V.t where V is the mean value for the slide rate and t the running time.Specific wear rate
Specific Wear Rate
1. Example with PMMA
A reference value of the specific wear rate for Polymethyl methacrylate (PMMA) was assumed to be between 10-4 and 10-5 mm3/Nm based on values for common polymeric materials (Archard, 1961). The specific wear rate for the conditions in these tests on PMMA was calculated to be approximately 1.4 ∙ 10-5 mm3/Nm. This number corresponds well with the expected values from literature.
2. Example with SiC
One of the research point out about the specific wear rate of SiC filled glass fiber reinforced epoxy composite is less in comparison to that of unfilled glass fiber reinforced epoxy composites. This is because of fiber- filler interaction and uniform dispersion of filler content throughout the composite decreases the specific wear rate of composites. Adding SiC filler content beyond 10wt. % may not significantly decrease the specific wear rate of the composite.
For more literature- (Refere http://nanomechanicsinc.com/wp/wp-content/uploads/2018/07/Specific-Wear-Rate-Testing-TH.pdf)
Ashish
The specific wear rate is simply the wear volume divided by the product of the normal load and the sliding distance. Wear is a complex process that occurs when two surfaces are slid against one another, resulting in gradual removal of one or both materials. The simple fact of wear is that it appears unavoidable, altering performance of mechanical and biological systems and ultimately resulting in system failure. Wear of materials is becoming increasingly important and could easily have as much of a functional and economic impact as friction. For example, in many industrial applications, components become worn and must be replaced. These replacements may be costly due to expensive components, labor and the down time of the equipment while the part is being replaced.
Wear rate is volume loss per unit distance and not depend on the load acting.
Usually wear rate is expressed and calculated as W=mm3/N.m where mm3 refers to wear volume and N.m is normal load per sliding distance. The value of this equation is that is independent of hardness of the uppermost surface of the softer tribopair material. The sliding distance can be calculated as the linear speed times the duration of the test. In the case of a reciprocating test you can find the sliding distance as the frequency(f) times the duration of the test(t) time wear track length (wtl), or SD=f*t*wtl.
wear loss = mass loss (before test weight - after test weight) (g) or,
=linear dimensional change (m) or,
= volume loss (m3).
wear resistance = 1/(wear loss) (m−1,m−3, g−1).
wear rate=(wear loss)/(sliding distance or time) (m/m, m3/m, g/m, g/s, m/s, m3/s ).
specific wear rate = (wear rate)/(normal force) (m3 N−1m−1, g−1 N−1m−1)
The following paper should help to get more information:
https://www.sciencedirect.com/topics/engineering/specific-wear-rate
If the applied load and sliding distance are constant, the wear rate expression will be more effective.
Both are mechanically induced surface damage volume loss. it depends on increasing applied load and sliding distance at any volume fraction. Specific wear rate is sometime called dimensional wear coefficient. By tribology concept it is how fast the material is removed from the surface. wear rate is classified into adhesive, abrasive, corrosive and surface- fatigue and they are measured using coordinate measuring machines, SEM, AFM, profilometry, optical microscope, scratch testing etc.
(1) Wear rate is "volume loss per unit distance" ,and specific wear rate is "volume loss per unit meter per unit load".
(2) Formula for the wear rate calculation and specific wear rate calculation, i wear rate= volume*hardness/ sliding distance*applied load
Specific wear rate= V(volume of removed material)/ applied normal load(pressure)*total sliding distance.
(3) unit difference- wear rate is expressed m3/m, while specific wear rate in m3*Nm-1.