One of the main reasons preventing a wide application of eHome systems in practice is the effort needed to combine all appliances, necessary controller and infrastructure components to benefit from derived value-added services. The properties, dependencies, locations, and installation conditions have to be properly specified for this composition and its deployment. Due to the great variance in services and eHome configurations there is a need for tool support for eHome systems. In this paper we address the software development issues of such tools. In our approach we base the software development on graph rewriting language techniques. Based on our experience, we consider this approach as a possibility to improve the productivity of the eHome system tool development. With the aid of Fujaba, we created a model capable of specifying functions, devices, environments, and value-added services. Furthermore, we used Fujaba to create the activities as graph rewriting rules for model modifications. To apply the model and to carry out the actual specification for a particular eHome and particular appliances we generated the eHomeSpecificator tool from the model and its activities. This tool can serve as a base for a wider range of tools supporting eHome systems.
For die forgings, fabricated from steels Ck 45, 42 CrMo 4 and 38 MnSiV S 6 3, TTT and CCT diagrams were determined, and after different heat treatments, measurements of mechanical properties, fatigue strength and residual stresses were carried out. The diameter of the specimens after the forging process was 32 and 45mm. The residual stresses after quenching between −450 and +160N/mm2 could be reduced to about 60N/mm2 by tempering up to 620°C. The fatigue strength in the range of 300N/mm2 depends more on the strength than on the residual stresses. Calculations with the program Antras‐Thepla correlate well with the measured microstructures and residual stresses. This shows that the materials and processing data used for the calculation are conform to real processes.
Elsevier Science Publishers B. v., to be published For a cylinder of a 26 NiCrMoV 115 steel, forged to 970 mm diameter and a length of 3000 mm, residual stresses were measured. For this material an isothermal transformation diagram, physical and mechanical data were available. With these data the stresses and displacements were calculated by finite element analysis using the program Thepla for oil quenching from 1100°C and for air cooling from 900°C. The calculated values for the residual stresses at the surface are in good agreement with the measurements of the stresses in longitudinal and transverse direction.(AM 0284)
Globularization of pearlite enhanced by thermomechanical processingA plain high-carbon steel (0.74% C) was used to study the globularization of pearlite and the resulting change of mechanical properties. After the variation of the deformation temperature it was found that only the deformation applied after the completion of the pearlite transformation leads to the spheroidization of pearlite. The reaction time of this process was shortened to 1;10000 compared with an annealing without deformation. The kinetics of pearlite spheroidization are dependent on the pearlite lamellar thickness as well as pearlite orientation with respect to the direction of deformation. The final microstructure is considerably finer and shows a higher toughness without a significant loss of strength.(AM 0287)
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