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Abstract
Abstract The problem of numerical simulation of the material interface response under monotonic and cyclic loading is of fundamental scientific and engineering importance. In fact, such interfaces occur in most engineering and geotechnical structures. The present work is devoted to the deformational response analysis of contact interfaces under monotonic and cyclic loads. The class of materials includes rock and structural joints, soil structure interfaces, masonry and cementitious joints, localized shear bands and so on. The aim of the proposed model is to simulate the cyclic shear test under constant normal load. The associated dilatancy effect is associated with the configurational effects of asperity interaction or dilatancy of wear debris layer. The large primary asperities are assumed as responsible for interfacial dilation and small size asperities as governing frictional sliding and hysteresis response. The elliptic loading yield function is assumed to translate and rotate during progressive or reverse loading events. The model formulation is discussed and confronted with experimental data.
Highlights
The most important effects related to monotonic and cyclic response of contact interfaces of brittle materials are analyzed in this paper
Two types of interfaces can be considered: first as a natural joint, where the surface morphology is described by the joint roughness coefficient JRC[6,35] (Fig. 2a), and second, where the interface is artificial sawcut material joint and the surface morphology is represented by periodic piecewise linear or curvilinear shape[11,34] (Fig. 2b, c)
The rock joint interface is treated as the contact zone with properties different than the rock block with shape described by asperities
Summary
The most important effects related to monotonic and cyclic response of contact interfaces of brittle materials are analyzed in this paper. The mechanical behavior of such contact interfaces (shear strength), shear and normal deformation dominates the mechanical behavior of in situ rock masses under different loading condition. Frictional properties of joints are usually investigated by performing shear test under constant normal load CNL[11] (Fig. 1) and constant normal stiffness CNS condition. There are many works dealing with the influence of the shape of these asperities on the behavior of the cyclic shear process.[1,26] For the analyzed issues, the most important influence on tangential stresses tendencies and changes in the contact layer height have primary asperities.[4,18]. The basic model used in the analysis of soil deformation processes (digging, compaction) is a model of perfectly plastic material that meets the Coulomb or Drucker-Prager condition of plasticity and associated or
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