Issue 51

E. Mousavian et alii, Frattura ed Integrità Strutturale, 51 (2020) 336-355; DOI: 10.3221/IGF-ESIS.51.25 349 (a) (b) (c) (d) Figure 13 : Modelling process to generate the interlocking interface, given the orientation and number of locks in four steps (a) to (d). There are two ways (two rows in the figure) for modelling an interlocking interface, depending on the length of the diameter d and base of the trapezoid p . In addition to g , the length of a lock centreline b can also be formulated numerically. Depending on the location of a lock on an interface, three equations can determine this length. Fig. 14 shows three zones on a trapezoid, to which three corresponding intersection points of the lock centreline and L (red point in Fig. 14) are associated, i.e.: 3 1 3 θ cos φ θ 2 cos 2 d d a L               (26)     2 1 min cos ζ φ , cosφ L d p L    (27)   3 1 2 L L L L    (28) Figure 14 : Three zones for calculation of the length of the lock b .