13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- A detailed derivation of this is given in [13]. Figure 3 shows the overall elastic follow-up factor as a function of relative effective stiffness ratio. When the elastic follow-up factor is in excess of 6 (or 1/Z=0.167) these conditions essentially correspond to load controlled conditions, where as an elastic follow-up factor of more than 1.25 (or 1/Z=0.8), represents displacement controlled conditions. Figure 2. Three bar structure Figure 3. Variation of overall EFU with effective stiffness ratio in three bar structure
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