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Tribo Testing

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Classification oftribotests according tothe degree of realism

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Concept of tribo tester+ tujuan ?+ perbedaan antara tensile test, fatigue test, hardness test, dst

dengan wear & friction test ?+ hal-hal yang perlu diperhatikan dalam membuat model test ?

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The tribological process in a contact between two surfaces includes mechanical andtribochemical changes as well as material transfer. The changes are determined bymaterial and energy input parameters and result in a similar set of partly changed outputparameters.

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Testing methods Tribometer (1774): instrument intended to measure

friction (tribotester) Two types: symmetric, asymmetric Contact: conformal and counterformal (concentrated) ASTM G77: block on ring ASTM G83: crossed cylinder ASTM G99: pin on disc DIN 50324: sphere on disc ASTM G98: rotating pin-on-flat

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Common slidingwear testconfiguration

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Counterformal andconformal contacts

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Ranking of materials for existing equipments Selection of materials for new applications Application independent, characterization of wear and

friction properties of materials Studies of wear mechanisms appearing in selected

tribological applications

REASONS TO PERFORM A TRIBOTEST:

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Specify the reasons to perform the tribotest Select tests providing the closes possible resemblance to the

application in mind Make sure the correct wear mechanism or surface damages are

imitated in the test Select a test which is reasonably quick, controllable and cost effective Use appropriate reference materials

RECOMMENDATIONS FOR TRIBOTESTPLANNING

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