Plasticity and Textures by Wiktor Gambin (auth.)

By Wiktor Gambin (auth.)

The classical, phenomenological conception of plastically anisotropic fabrics has handed a ways: from the paintings of von Mises provided in 1928, and the HilI formula given in 1948, to the most recent papers on huge elastic-plastic deformations of anisotropic steel sheets. A attribute function of this method is a linear circulation rule and a quadratic yield criterion. Mathematical simplicity of the speculation is a cause of its a number of purposes to the research of engineering constructions in the course of the onset of plastic deformations. even though, such an procedure isn't adequate for description of the steel forming strategies, while a steel point undergoes very huge plastic traces. If we take an at the start isotropic piece of steel, it turns into plastically anisotropic throughout the forming method, and the brought on anisotropy gradually raises. This truth strongly determines instructions of plastic circulation, and it results in an unforeseen pressure localization in sheet parts. to provide an explanation for the above, it will be important take into consideration a polycrystalline constitution of the steel, plastic slips on slip structures of grains, crystallographic lattice rotations, and finally, a formation of textures and their evolution throughout the complete deformation method. briefly, it is important to introduce the plasticity of crystals and polycrystals. The polycrystal research indicates that, whilst the complex plastic lines occur, a few privileged crystallographic instructions, referred to as a crystallographic texture, take place within the fabric. the feel formation and evolution are a first-rate reason behind the brought about plastic anisotropy in natural metals.

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3), the components M üld are equal to M üld • To specify the components M üld for the orthotropy case, let us reject, for amoment, the restriction M illd =0, that follows from the incompressibility condition. ), for i, k, 1= 1,2,3 and k * I, must be equal to zero. ), for i M üld , namely CT ü and shear stresses CT jk. Then, the coefficients M iUk (no * k * I, must vanish too. 11) Finally, taking into account 3 rejected restrictions MII/d =0, we have, in the case of orthotropy, 6 independent components of the above matrix.

The angular momentwn MjA) within a volume element C, is defined as the crossproduct of the vector 'i and the density of linear momentum pu} integrated over C,. 65) The third physicallaw is the principle 01 conservation 0/ energy. 66) Let us pass to the last principle called the Clausius-Duhem inequality. It follows from thermodynamical considerations. Assurne that the plastic yielding is a slow adiabatic process. 67) The function D is an internal dissipation 0/ energy lost during the plastic yielding process.

They may be also caused by concentrated forces or couples applied to the body. The external forces acting on the body volume are called the body forces. To define them, let us come back to the definition of a material body. The body B was defined as a set of material particles with a mass rn(B) attributed to it. The mass is a continuous function of the body volume. Consider a particle P that, at the time t, is at the point xj • A mass of an infinitesimal volume element du that contains the particle P may be represented in the form drn = pdu.

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