Woehler diagram

Figure 9 Woehler diagram for silicon nitride specimens...

In Figure 10 the number of fracture cycles and the characteristic number of fracture cycles for the respective test series is plotted against the maximum principal stress on the tensile loaded side of the specimens. The characteristic number of fracture cycles was determined by the method developed by Weibull [21]. In the Woehler diagram it can be seen clearly that fretting fatigue leads to a distinct deterioration of the life time. The higher the maximum stresses the clearer the decline of life time is. At Fn = 10 N (Pmax = 2311 MPa) the life time decreases at a maximum base load of OR.max = 210 MPa for about 80%. at Fn = 20 N (pmtx -2912 MPa) the life time decreases for about 91% compared to to life time under the same maximum base loading. 

Structural glazing Surface preparations Teak decks Test of a bead Thickness of the joint Transport equipment Uneven stress distribution UV radiation Waterswelling sealants Wettability Windshield bonding Woehler diagram. 

By subjecting a single lap shear specimen to dynamic cyclic load, the fatigue behaviour of adhesive bonds is determined. The test values are plotted in the stress-cycle (Woehler) diagram where the number of load cycles is represented as a function of the component load. An example is shown in Fig. 23. 

Subjecting a test piece to cyclic dynamic load determines the fatigue behaviour of adhesive bonds. When the test values are plotted on a Woehler diagram, the appropriate reduction factor, fz, for prolonged exposure to dynamic stress can be read off (Fig. 31). 

Woehler diagram Representation of the magnitude of a mechanical stress to cause failure as a function of the number of load cycles... 

Stress cycle diagrams (Woehler diagrams) remain the most commoniy used means for evaluating long-term cyclic, i.e., fatigue, behavior of fiber composite piastics. With this method, totai specimen faiiure, i. e., fracture, is equated with damage = 1, Fig. 1.65 [148]. 

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