Tribology in Manufacturing Technology by J. Paulo Davim

Author:J. Paulo Davim
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

24 μm Grit size

16 μm Grit size

Slider material

Starting μ

Ending μ

Starting μ

Ending μ

AISI 52100 steel

0.47

0.35

0.45

0.29

2014-T4 aluminium

0.69

0.56

0.64

0.62

PMMA

0.73

0.64

0.72

0.60

aNormal force 2.49 N, sliding speed 5 mm/sec, multiple strokes 20 mm long

As wear progresses, the wear debris accumulates between the asperities and alters the effectiveness of the cutting and plowing action by covering the active points. If the cone model is to be useful at all for other than pristine surfaces, the effective value of θ must be given as a function of time or number of sliding passes. Not only is the wear rate affected, but the presence of debris affects the interfacial shear strength, as is explained later in this chapter in regard to third-body particle effects on friction. The observation that wear debris can accumulate and so affect friction has led investigators to try patterning surfaces to create pockets where debris can be collected [60]. The orientation and depths of the ridges and grooves in a surface affect the effectiveness of the debris-trapping mechanism.

(d) Plowing with Adhesion. Traditional models for sliding friction have historically been developed with metallic materials in mind. Classically, the friction force is said to be an additive contribution of adhesive (S) and plowing forces (Fpl) [8]:

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