Download Constitutive Laws for Engineering Materials with Emphasis on by Chandrakant S. Desai, Hema J. Siriwardane PDF

By Chandrakant S. Desai, Hema J. Siriwardane

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Example text

Once the surface of the plastic is sufficiently worn so that the glass is exposed, wear on the counterface becomes evident. If the counterface is not sufficiently hard, such as with an unhardened steel, the wear of the counterface can predominate. To avoid this effect entirely, it is generally sufficient to make the counterface harder than the glass fibers. In effect this Copyright © 2004 Marcel Dekker, Inc. 6 Illustration of the effect of glass exposure on the sliding wear of a glass-filled plastic and metal couples.

The last can be a factor in sliding, impact, and rolling modes, as well as in the traction mode described above. , oxidation). 9 Comparative nature of the force pulses resulting from the impact between a metal and a metal, “A”, and an elastomer, “B”. Copyright © 2004 Marcel Dekker, Inc. 10 Illustration of elastomer deformation as a result of a difference in surface speeds between an elastomer-coated roller and a moving flat surface. rates, higher ambient temperatures, and any other aspects which tend to increase surface temperatures (4,5).

In situations where such encounters are frequent, the wear resistance would be poorer as a result of failure of the binder. Similarly, this coating could exhibit very poor wear resistance in a solid particle erosion situation, where the particles are small enough to erode the binder from around the particle. This difference is illustrated in Fig. 25. Another illustration of this sensitivity to the wear situation is the use of PTFE as a filler in coatings, sintered materials, and plastics. PTFE is a major factor in the formation of transfer films under sliding conditions.

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