Applied Mechanics and Materials Vols. 727-728

Abstract: Continuous casting mold feeding steel strip is a new technology to improve the organization and the equiaxed crystal ratio of casting slab. It is researched in one Steel Mill taking low carbon steel Q235B, 250 * 1600mm billet as the research object. Effects of the vibration feeding steel strip on the slab structure and performance is studied. Results show that, porosity in the center of cast billet and macro segregation of dispersion decreased through the continuous casting mould vibration feeding steel strip technology, which can improve the quality of macro structure and reduce the chemical heterogeneity shaft direction to the regional and then improve the plasticity in thick rolling plate.

Abstract: This paperstudied the development of stress and strain influences by different constraintdegree based on the concrete thermal stress tests. furthermore, suggested thevalue range of the constraint degree in the thermal stress test.

Abstract: The concrete covercorrosion-induced cracking is the key to service life predicting of reinforcedconcrete structures. The existing research results make engineering andtechnical personnel in specific applications bewilderment. In this paper, therepresentative theoretical analysis methods of existing have been classifiedand the characteristics of various methods have been analyzed, the accuracy ofvarious methods has been comparatively analyzed by a concrete case.

Abstract: Research of ABS and PP were mixed design, preparation and formulation of gold for the production process, performance test. Discussed in PP - g - MAH as computerize of cases, in the process of ABS blended with PP, ABS/PP blend formulas and the determination of process parameters is analyzed. Through performance test and analysis different composition ratio of computerize on the ABS/PP alloy performance impact. Finally concluded that, in the ABS/PP/PP blend - g - MAH, when PP-g-MAH is 4, 16 for PP, the impact of the blend with good performance, thermal deformation temperature is increased.

Abstract: EPDM rubber was exposed to an accelerated thermal aging environment produced by an air-circulating oven. The changes of morphology, mechanical properties of EPDM were monitored by scanning electron microscope (SEM), tensile/compressive testing. Crosslink density of EPDM was measured by the solvent swell method. The results showed that many cracks and voids appeared on the surface of EPDM with the exposure time. The aging process proceeded predominantly via crosslinking. The tensile strength increased with increase in crosslink density up to a maximum and thereafter decreased with further increase in crosslink density.

Abstract: Effects of heat treatment process of quenching and tempering under different temperature conditions on mechanical properties of X70 grade pipeline steel bends were studied. Brinell hardness, yield strength, tensile strength, elongation and impact absorbing energy of the bends were tested by using hardness tester, cupping machine and impact testing machine, respectively. It shows that the best heat treatment process of the X70 grade pipeline steel bends is quenching at 890 °Cand thermal insulation for 26 min then water cooling followed by tempering at 590 °C and thermal insulation for 60 min then air cooling. Furthermore, the resulting hardness, yield strength, tensile strength, yield ratio, elongation and impact absorbing energy reach HB230, 595 MPa, 725 MPa, 0.82, 28% and 300 J respectively, which has excellent comprehensive mechanical properties.

Abstract: Many Magnetic Abrasive Finishing has good flexibility, adaptability, self-sharpening characteristics, in the international arena has attracted wide attention, and its research results have been finishing in the plane, the outer surface, the inner surface of a round face and forming occasions been applied, Based on the precision grinding of cylindrical cam surfaces to illustrate the application of magnetic grinding technology in precision machining of the cam surface.

Abstract: Using the density-functional theory, the mechanical and electrical properties of TiN crystal with stacking faults have been evaluated. The formation energy of stacking faults are calculated. It is found that the stacking faults can increase the strength of TiN crystal but attribute little effect for the electrical properties. The uniaxial tensile stress can lower the Fermi surface of the TiN crystal, and the metallic characteristic is weakened with the stress increasing.

Abstract: Cutting process is a typical non-linear deformation problem, which involves material non-linear, geometry non-linear and the state non-linear problem. Based on the elastic-plastic material deformation theory, this theme established a strain hardening model. Build the simulation model of two-dimensional orthogonal cutting process of workpiece and tool by the finite element method (FEM), and simulate the changes of cutting force and the process of chip formation in the machining process, and analyzed the cutting force, the situation of chip deformation. The method is more efficient and effective than the traditional one, and provides a new way for metal cutting theory, research of material cutting performance and cutting tool product development.

Abstract: The search for continuous improvement of the processes and products offered to the market combined with continuous efforts to reduce energy consumption stimulates the development of techniques and tools geared towards their optimization. Thus, this manuscript describes the application of multivariate optimization in the process of face milling of DIN GGG 50 nodular cast iron by means of experimental design techniques, regression models, and Taguchi loss function. Three input parameters (axial “a_p” and radial “a_e” depth of cut, and feed-rate “f”) were used as controllable factors of the process and two output parameters (specific cuttingenergy “e_s” and roughnessaverage “R_a”) were considered as response variables. The output obtained as a result of optimization wase_s = 1.41 J/mm³and R_a = 0.85 µm by applying the input parameters a_p = 2.34 mm,a_e = 33.4 mm and f = 0.44 mm/rev.