The basic purpose of compaction is to obtain a green compact with sufficient strength to withstand further handling operations. The strength of green compact is influenced by the characteristics of the powders (apparent density, particle size and shape, internal pores etc.), the processing parameters (applied force, pressing type, and temperature) and testing conditions (strain rate etc.) Successful powder cold compaction is determined by the densification and structural transformations of powders (metallic powders, ceramic powders and metal-ceramic powder mixtures) during the compaction stages. In this paper, for understanding the factors that determine a required strength of compacted metal-ceramic powder mixtures, we present the densification mechanisms of different mixtures according to densification theories of compaction, the elastic-plastic deformations of mixture powders, the stressstrain relations and the relaxation behavior of compacted metal-ceramic composite parts and the particularities of each of them.
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The paper presents an aproximate analytic method for determination of the stored energy of plastic deformation during cold bending of metal tubes at bending machines. Calculations were performed for outer points of the tube layers subjected to tension and compression (the points of maximum strains). The percentage of stored energy related to the plastic strain work was determined and the results were presented in graphs. The influence and importance of the stored energy of plastic deformation on the service life of pipeline bends are discussed.
, it is possible to estimate the deformations u z of the bottom plates, caused by different types of soil settlements ( Fig. 2 ). Figure 6 Geometry of the analyzed steel tank on a type C foundation with loosened soil zone ( K z1 ) and deformations u z of the bottom plate and u r of the shell. Figure 7 Comparison of vertical deformations u z of tank bottom plates and radial deformations u r at the point No. 2 for type A and type B foundations of uniform stiffness K z ( Fig. 4 , Fig. 5 ). Figure 8 Elastic-plasticdeformations u r of bottom plates at the
This article deals with non-destructive evaluation of austenitic stainless steels, which are used as the biomaterials in medical practice. Intrinsic magnetic field is investigated using the fluxgate sensor, after the applied plastic deformation. The three austenitic steel types are studied under the same conditions, while several values of the deformation are applied, respectively. The obtained results are presented and discussed in the paper.
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1 Introduction Surface plasticdeformation is often applied proceeding operation. Using this method allows to solve some technological problems such as decreasing roughness, hardening surface layer, forming required relief [ 1 ]. As a result of surface plasticdeformation microstructure and physical properties of surface layer can be changed, hardness, strength, wear resistance increased, useful stress field appeared. The are many different modifications of surface plasticdeformation such as knurling, bead-blasting treatment, caulking, ironing. The technologist