Summary
Numerical simulation of patterns of shear bands in biaxial compression tests using an elasto-plastic Cosserat constitutive equation is presented. Random distribution of the material properties acts as a trigger for the localized deformation. Two types of stress-strain curves, namely strain softening and strain softening followed by strain hardening, are investigated. It is shown that the characteristic of the stress-strain curve is crucial for the patterning of shear bands. While calculations with the stress-strain curve with solely softening yield only one single shear band, a flock of shear bands can be obtained with the stress-strain curve with softening followed by hardening. Benefited from the characteristic length provided by the Cosserat elasto-plastic constitutive equation, the dependence of the calculation on the mesh-size is avoided.
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References
Aifantis, E. C.: On the microstructural origin of certain inelastic models. J. Eng. Mater. Technol.106, 326–334 (1984).
Bardet, J. P., Proubet, J.: A numerical investigation of the structure of persistent shear bands. Géotechnique41, 599–613 (1992).
Bathe, K. J.: Finite element procedures in engineering analysis. Englewood Cliffs: Prentice-Hall 1982.
Bazant, Z. P.: Crack band model for fracture of geomaterials. In: Proc. 4th Int. Conf. in Numer. Methods in Geomech., vol. 3 (Eisenstein, Z., ed.), pp. 1137–1152. Edmonton, Canada, 1982.
Bazant, Z. P., Lin, F. B.: Nonlocal yield limit degradation. Int. J. Num. Meth. Eng.26, 1805–1823 (1988).
Becker, M., Lippmann, H.: Plane plastic flow of granular model material, experimental set-up and results. Arch. Mech. (Warszawa)29, 829–846 (1977).
de Borst, R.: Simulation of localisation using Cosserat theory. In: Proc. 2nd Int. Conf. on Computer Aided Design of Concrete Structures (Bićanić, N., Mang, H. A., eds.), pp. 931–944. Swansea: Pineridge Press 1990.
de Borst, R.: Simulation of strain localisation: a reapprasal of the Cosserat continuum. Eng. Comp.8, 317–332 (1991).
de Borst, R., Mühlhaus, H. B., Pamin, J., Sluys, L. Y.: Computational modelling of localization of deformation. In: Proc. 3rd Int. Conf. Comp. Plasticity (Owen, D. R. J., Hinton, E., Onate, E., eds.) Swansea: Pineridge Press 1992.
Cundall, P. A., Strack, O. D. L.: A discrete numerical model for granular assemblies. Géotechnique29, 47–65 (1979).
Desrues, J.: La localisation de la deformation dans les matériaux granulaire. Dissertation, Institut National Polytechnique de Grenoble, Grenoble, 1984.
Drescher, A., Vardoulakis, I.: Geometric softening in triaxial tests on granular materials. Géotechnique32, 291–303 (1982).
Fukushima, S., Tatsuoka, F.: Strength and deformation characteristics of saturated sand at extremely low pressures. Soils Found.24, 30–48 (1984).
Gudehus, G.: Einige Beiträge der Bodenmechanik zur Entstehung und Auswirkung von Diskontinuitäten. Felsbau4, 190–195 (1986).
Günther, W.: Zur Statik und Kinematik des Cosserat-Kontinuums. Abh. Braunschweigische Wiss.10, 195–213 (1958).
Han, C., Vardoulakis, I.: Plane-strain compression experiments on water saturated fine-grained sand. Géotechnique41, 49–78 (1991).
Joseph, D. D., Saut, J. C.: Short-wave instabilities and ill-posed initial value problems. Theoret. Comput. Fluid Dyn.1, 191–227 (1990).
Kanatani, K.: A micropolar continuum theory for granular materials. Int. J. Eng. Sci.17, 419–432 (1979).
Leroy, Y., Ortiz, M.: Finite element analysis of strain localization in frictional materials. Int. J. Numer. Anal. Meth. Geomech.13, 53–74 (1989).
Loret, B., Prevost, J. H.: Dynamic strain localization in fluid-saturated porous media. ASCE J. Eng. Mech.117, 907–922 (1991).
Macvean, D. B.: Die Elementarbeit in einem Kontinuum und die Zuordnung von Spannungs- und Verzerrungstensoren. ZAMP19, 157 (1968).
Mandl, G.: Mechanics of tectonic faulting. Amsterdam: Elsevier 1988.
Molenkamp, F.: Comparison of frictional material models with respect to shear band initiation. Géotechnique35, 127–143 (1985).
Mühlhaus, H. B.: Continuum models for layered and blocky rock. In: Comprehensive rock engineering (Hudson, J. A., ed.), Vol. 2. Analysis and design methods. Oxford: Pergamon Press 1991.
Mühlhaus, H. B., Vardoulakis, I., Tejchman, J.: A generalized flow theory for granular materials. Lect. Inst. Soil Mechanics and Rock Mechanics, Univ. Karlsruhe 1987.
Nadai, A.: Theory of flow and fracture of solids. New York: McGraw-Hill 1950.
Oda, M., Konishi, J., Nemat-Nasser, S.: Experimental micromechanical evaluation of strength of granular materials, effects of particle rolling. Mech. Materials1, 269–283 (1982).
Ortiz, M., Simo, I. C.: An analysis of a new class of integration algorithms for elastoplastic constitutive relation. Int. J. Numer. Meth. Eng.23, 353–366 (1986).
Palmer, A. C., Rice, J. R.: The growth of slip surfaces in the progressive failure of overconsolidated clay. Proc. Roy. Soc. (London)A232, 527–548 (1986).
Rudnicki, J. W., Rice, J. R.: Conditions for the localization of deformation in pressure-sensitive dilatant solids. J. Mech. Phys. Solids23, 371–394 (1975).
Schäfer, H.: Versuch einer Elastizitätstheorie des zweidimensionalen ebenen cosserat-Kontinuums. Miszellaneen der Angewandten Mechanik, Festschrift Tolmien, W. Berlin: Akademie-Verlag 1962.
Shawki, T. G., Clifton, R. J.: Sheart band formation in thermal viscoplasticity. Mech. Mater.8, 13–43 (1989).
Sluys, L. J., de Borst, R.: Strain softening under dynamic loading conditions. In: Proc. 2nd Int. Conf. on Computer Aided Analysis and Design of Concrete Structures (Biéanić, N., Mang, H. A., eds.), pp. 1091–1104, Zell am See, Austria, 1990.
Tatsuoka, F., Nakamura, S., Huang, C. C., Tani, K.: Strength anisotropy and shear band inclination in plane strain tests of sand. Soils Found.30, 35–54 (1990).
Tejchman, J.: Scherzonenbildung und Verspannungseffekte in Granulaten unter Berücksichtigung von Korndrehungen. Veröff. Inst. Boden- und Felsmechanik, Univ. Karlsruhe 1989.
Tejchman, J., Lizcano, A.: Experiments on the patterning of shear zones in a simple shear apparatus. Int. Rep. Inst. Soil Mechanics and Rock Mechanics, Univ. Karlsruhe 1992.
Uesugi, M.: Friction between dry sand and construction. Dissertation, Tokyo Institute of Technology 1987.
Vardoulakis, I.: Scherfugenbildung in Sandkörpern als Verzweigungsproblem. Veröff. Inst. Boden- und Felsmechanik, Univ. Karlsruhe 1977.
Vermeer, P. A.: van Langen, H.: Soil collapse computations with finite elements. Ing. Arch.59, 221–236 (1989).
Wood, R. D.: Finite element analysis of plane couple-stress problems using first order stress functions. Int. J. Num. Meth. Eng.26, 489–509 (1988).
Wu, W.: A unified numerical integration formula for the perfectly plastic von Mises model. Int. J. Num. Meth. Eng.30, 491–504 (1990).
Wu, W., Sikora, Z.: Localized bifurcation in hypoplasticity. Int. J. Eng. Sci.20, 195–201 (1991).
Wu, W., Kolymbas, D.: On some issues in trixial extension tests. ASTM Geotech. Testing J.14, 276–287 (1991).
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Tejchman, J., Wu, W. Numerical study on patterning of shear bands in a Cosserat continuum. Acta Mechanica 99, 61–74 (1993). https://doi.org/10.1007/BF01177235
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DOI: https://doi.org/10.1007/BF01177235