PSI - Issue 32

S. Yu. Devyatkov et al. / Procedia Structural Integrity 32 (2021) 56–63 S. Yu. Devyatkov / StructuralIntegrity Procedia 00 (2019) 000 – 000

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The clay interlayers included in the design scheme were modelled using Goodman contact elements (Goodman 1974) (Fig. 2a).

Fig. 2. (a) A Goodman contact element and its piecewise linear deformation diagrams in (b) the normal and (c) the tangential directions. The relationship between the normal contact stress ( ) and the corresponding deformation ( ) was modelled using a linear equation (Fig. 2b): ൌ ǡ where is the normal stiffness of the contact. For tangential stresses ( ) acting along the contact line, the connection with the shear strain ( ) was determined using the three-link piecewise linear approximation (Baryakh et al. 1992) (Fig. 2c): ൌ ℎ Ͳ ൏ ≤ − − ǡ ℎ ൏ ≤ ∗ ∗ ℎ ൐ ∗ ,