Fracture Behaviour of Plastics Components

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Fracture behaviour of plastic components

When used as construction materials for plastic components, plastics are generally regarded as materials with particularly high ductility. However, it can be deduced from the large number of cases of damage that a number of influencing factors, such as

design-related notches,
production-related defects,
high stress velocity,
multi-axial stress states,
surrounding media, and
low temperatures

greatly increase the susceptibility of such materials to brittle fracture [1].

When analysing the mechanical properties and evaluating the deformation and fracture behaviour, the combination of the microscopic and macroscopic approach van achieve decisive progress with regard to the clarification of damage mechanisms.

Figure 1 shows the factors influencing the fracture behaviour on the part of the stress, the geometry, the material and the environment (blue marked fields).

Fig. 1:

Influence factors on the fracture behaviour of plastic components

The factors influencing the fracture behaviour are the stress state and the loading speed on the stress side, the dimensions and the component shape as well as discontinuities and cracks on the geometry side, the microstructure (morphology) and the chemical composition on the material side and finally the temperature and the surrounding media.

See also

References

Blumenauer, H., Pusch, G.: Technische Bruchmechanik. Deutscher Verlag für Grundstoffindustrie, Leipzig Stuttgart (2003), 3rd Edition (ISBN 3-342-00659-5); (see AMK-Library under E 29-3)
Blumenauer, H.: Bruchmechanische Werkstoffcharakterisierung. Deutscher Verlag für Grundstoffindustrie, Leipzig (1991) (ISBN 3-342-00630-7); (see AMK-Library under E18)