In the present paper, the fracture behaviour of the shot-earth 772, in terms of crack path, is numerically investigated. To such an aim, a version of the lattice discrete element method is used to numerically simulate...
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In the present paper, the fracture behaviour of the shot-earth 772, in terms of crack path, is numerically investigated. To such an aim, a version of the lattice discrete element method is used to numerically simulate fracture toughness testing performed, on the shot-earth 772, by employing the modifiedtwo-parametermodel. A comparison between the numerical crack path and the experimental ones is performed, highlighting as the lattice discrete element method is able to capture the kinked crack shape, typical of quasi-brittle materials.
Earth building techniques have been around for thousands of years. Among them, it is worth mentioning: cut blocks, poured earth, superadobe, adobe, cob, rammed earth, compressed stabilised earth blocks, wattle and dau...
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Earth building techniques have been around for thousands of years. Among them, it is worth mentioning: cut blocks, poured earth, superadobe, adobe, cob, rammed earth, compressed stabilised earth blocks, wattle and daub, shaped earth, and straw-clay. An innovative technique among the earth building ones, and named shot-earth technique, is the topic of the present paper. The technology employs a specific mixture of the shot-earth (named shot-earth 772) consisting of 7 parts of excavated soil, 7 parts of aggregates and 2 parts of cement (by volume): the mixture stream is projected at high velocity onto a surface, adding about 3% of water (by volume) at the spraying nozzle. The present research work deals with the numerical simulation of the fracture behaviour of the shot-earth 772. More precisely, an experimental campaign performed to compute the fracture toughness of the material is here numerically simulated. To such an aim, a homemade Finite Element numerical model, developed in standard Fortran language, is used to simulate both flexural and fracture tests on the shot-earth considered. In fact, such a model is able to properly consider. The material fracture process is described by means of a cohesive law, which is introduced within the cracked zone, whereas an elastic law is adopted for the un-cracked region of the material. Subsequently, the modifiedtwo-parametermodel is used in order to compute the fracture toughness, from both the experimental fracture tests and the corresponding numerical simulations. Finally, the numerical results are compared with the experimental ones.
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