Basic understanding of technically relevant mechanism of failing for materials.

Basic understanding of materials is the prerequisite for application of materials and to calculate its reliability. Two areas in the materials can be distinguished where the failing starts: 1. The volume: In this case mechanical (inauspicious stress distribution, overload, vibrations ) or thermal (overheating, phase transformations, chemical reactions ) reasons can cause the failing. The damage results in fatigue processes, crack initiation and crack growth. 2. Surface mechanism: Mechanically caused mechanisms are wear, erosion and cavitation. Chemically caused damages are corrosion mechanisms in all variations. The basic knowledge for the different reasons of failing and the testing methods will be discussed. For selected cases of damage the various test methods will be demonstrated.

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