This new approach provides a minimum strength value for defined surface conditions and allows the service life to be calculated under specified stress while taking into consideration material fatigue under stress. There is another advantage to the approach over the previous one. This model reduces statistical uncertainties and overly conservative safety facts, and thus allows substantially higher mechanical stresses to be applied to ZERODUR® components.
Customers in the fields of astronomy, aeronautics and lithography who are interested in using ZERODUR® glass-ceramic with significantly higher static and dynamic stress profiles will now be able to do so thanks to more accurate predictions of its strength.
THE STRENGTH OF ZERODUR®
Breakage probability for different surface conditions
The three parameter Weibull curves all drop to zero breakage probability depending on the surface conditions. The minimum values are now much higher than the previously used 10 MPa, which means that ZERODUR® can be used with higher mechanical loads in the future. Source: SCHOTT/P. Hartmann