Equations wear volume

The wear volume of plastic material is given by equation ... 

The wear rate as expressed in wear volume can be empirically obtained from the Archard s equation (13)... 

Brittle polymers. A simple expression, similar to Archard s equation, has been used to determine the wear volume Vwd) ... 

Sometimes wear factor or specific wear rate is the metric in a PV study. Wear factor is essentially the constant in the Aichard equation that is cited for abrasion and adhesive wear in metals. This equation states that wear volume is proportional to the sliding distance and the normal force. 

A wear factor [mm /fN m)] x 10 is calculated with the equation W = KxFxVxT, where W is wear volume (mrtf), K is wear factor... 

The change of the wear volume per sliding distance with normal load was studied and is shown in figure 1 to 4 for POM, PA6.6, PBT and PTFE respectively. The wear volume is linear with the normal load for all concentrations measured, as was expected according to equation 3. 

Not only friction forces but also working life is essential when designing a bearing. The calculation below follows the basic energetic wear equation" as proposed by Fleischer [8]. It is based on the wear-specific friction work" vty. This characteristic is an expression of the friction work input into the friction material with reference to the worn volume. For the material combination examined here the wear volume is calculated only from the wom-off volume of the bearing material. The wear-specific friction work is calculated as follows ... 

Manufacturers will have the wear factor, K tabulated for comparison between materials. The Archard wear law, while developed for dry sliding of metals, often holds for polymeric materials. Archard s law implies that the volume of wear will increase linearly for all time. However, for most polymers against metals, wear volume will often deviate from linear behavior, by slowing as a function of time, and occasionally reaching a maximum value. This can result in a parabolic form to the volume loss as a function of time as shown in Equation 13.17. 

This is the wear equation of rubber abrasion in unsteady state. Assuming that the steady state has been reached when the number of revolution is equal to N, on the basis of Equations(14,a) and (14,b), the sum of volume loss of a tongue after another N revolutions, i.e., from N to 2N revolutions, can be calculated by... 

This equation relates the volumetric material loss per unit sliding distance (Q) to the normal load (W) and hardness of the soft surface (H). The dimensionless constant K given above is an important property that provides a measure of the severity of the interaction between the asperities of two interacting surfaces and the likelihood of this interaction generating wear. However, in engineering applications, it is often more useful to use a dimensional wear coefficient, k (mm m ), i.e. the volume of material lost to wear per unit distance slid, per unit normal load on the contact. The use of this coefficient... 

The expression, Eq. 3-5, for volume wear can then be modified for this case by dividing each side of the equation by the projected area A, resulting in ... 

The wear resistance of materials can be predicted from an experimentally determined wear factor. The wear factor is derived from an equation relating the volume of material removed by wear in a given time per unit of load and surface velocity. The general equation is given in Eq. (2.2) and the special case of a flat surface is given in Eq. (2.3) ... 

Using the analysis from a white hght interferometer (Zygo New View 5000-3D), it was possible to obtain volume losses and calculate the dimensionless wear coefficient values of K using the Archard equation 1 [3] where V is volume loss, H hardness, Wload and L sliding distance. 

Post-test disc wear tracks were measured with a 2-D Talysurf profilometer. For each wear track, four measurements were carried out and the average of the four measurements was used to calculate the disc volume loss, see equation (1). Pin wear scars were measured under optical microscopy. The average of two diameters (the largest and the smallest diameter across the wear scar) was used to calculate the volume loss of the pin [23], see equation (2) while the height of the worn pin can be... 

Therefore, if k is the probability of forming a volume of wear debris at a point corresponding to a hemisphere of radius a, the total quantity of wear is given by equation ... 

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