The proportion of plastics in the lightweight sector is rising steadily. At present, components are often dimensioned in line with conventional methods, which, as a general rule, involve safety factors and reduction factors. Although this is a valid method for engineering plastic components, with a view to structural durability and lightweight structures it is not sufficiently close to reality. In addition, possible interactions between different influencing factors are not taken into account. And, estimating the reduction factors leads to an uncertainty, which, in turn, may result in over-dimensioning or under-dimensioning of the component. The potentials these materials can offer with regard to lightweight design are, in many cases, not exploited to the full extent.
An appropriate method of dimensioning plastic components with a view to structural durability and lightweight structures is experimental simulation. Using this method means taking account of possible interactions between the various influencing factors and looking at the complete system, consisting of
- manufacturing technique
- environmental influence and
- external loading
in its entirety.
The MultiTesters is manufactured by injection molding. The MultiTester's modular design allows specific factors which have an impact on the mechanical properties of unreinforced and reinforced plastics to be investigated:
- Fiber orientation,
- Weld line strength,
- Influence of process parameters during injection molding,
- Various types of loading (static, dynamic and cyclic)
- Environmental factors such as temperature, humidity, media and aging.
The MultiTester also enables validation of numerical material models that have been developed on the basis of simple conventional test specimens.