Papers by Keyword: Stress

Abstract: The calculations of stresses acting on the wall of boiler drum during the start-up process are presented in this paper. On the basis of the temperature measurements, which were carried out to determine the temperature distribution along the circumference of the outer wall of boiler drum, the temperature at the inner wall surface is determined using the inverse methods. The computations are carried out for the whole operation cycle of the power plant. Therefore, the pressure and temperatures are updated at consecutive time steps. These parameters allow determining the maximum values of circumferential, axial and Von Misses stresses during the operation cycle of steam boiler.

Abstract: The corrosion behavior of stainless steel and carbon steel in the mortars suffered stress is studied by electrochemical tests. The results show that the corrosion of rebar is accelerated as the magnitude of stress increasing. Under the same stress magnitude, compressive stress more seriously degraded the corrosion resistance of rebar than tensile stress in mortar in an aggressive environment.

Abstract: The article deals with of a hydrogen pressure vessel suitable for high pressure of approximately 75MPa. One of the goals is to design a vessel from materials whose strength will meet mechanical requirements a calculated in both analytical and numerical ways. Another objective is the simulation of the design the pressure vessel with regard to safety and weight requirements.

Abstract: By finite element software ANSYS a model of GIS busbar tube was established for investigating the effect of the gas pressure on the shell. The results shows that the stress concentration degree is higher on the shoulder between the main tube and the branch pipes under the internal pressure and the gravity, and the highest value is 44.92MPa which is far lower than the admissible stress. Stress changed along the thickness direction, and its value decreased gradually from the inside out. The distributions of the strain and deformation are similar to that of the stress.

Abstract: The 3D model of the lathe tool is established by using the Pro/E of 3D design software, then imported 3D model into the finite element software Workbench, and analyzed its statics using the finite element method, and got the stress figure and strain figure and total deformation figure while the lathe tool undertaking the cutting force, through the analysis it shows that the strength of the lathe tool can meet the processing requirements.

Abstract: Current status of a dedicated neutron diffractometer (TAKUMI) for investigations of stresses and crystallographic structures in engineering components, that has been built at Materials and Life Science Facility of J-PARC, was introduced as well as the engineering studies done there. Several topics recently performed at TAKUMI were selected to be introduced; internal strains in an ITER central solenoid conductor sample, internal strains in a rebar embedded in an air-cured concrete, deformation behavior of TRIP steels at RT and tensile behavior of LPSO Mg­Zn­Y alloys. These topics and the relevant results showed that TAKUMI is a powerful neutron diffractometer for various engineering studies.

Abstract: This article is based on the real condition of a tunnel. By using displacement and stress contours get from finite element analysis software ANSYS, the simulation of the tunnel excavation is modeled and the regulation of overlying rock’s displacement and stress is deducted during the evacuation of the tunnel. The analysis result to overlying rock mass’ rupture regularity can be helpful for the control of surrounding rock’s stability and the improvement of supporting system. The result shows finite element analysis software ANASYS can be used to guide tunnel constructions during the evacuation.

Abstract: The finite element method was applied in the construction design of the welding column of CNC boring machine for dynamic analysis and modal analysis. The laws of deformation and stress of a loaded column were obtained, and the natural frequency of each step and modes of column were also given according to this method. The results implied that the strength and the stiffness of welding column were met the machining requirements. Machine working frequency far less than inherent frequency, thus resonance is not easy to occur. Through the way, the optimization proposals of structure were given.

Abstract: In this paper, the neutral surface model of the laminated plate vibration isolation device is constructed based on the APDL parametric design language. While the contact analysis is done, the loading and solution studies are complete. Then the stress and strain graphs which change with different loads such as stress, tension, and turning force are obtained. The result shows that the stress of rubber is close to the steel plate under the turning force, but the former deformation is clear than the latter one.

Abstract: A two-dimensional finite differential model is established to find the variation of displacements and stresses of culvert components. The time-history analysis is performed and a wide range of parametric studies are carried out to investigate the influences of height of embankment, ground acceleration and the propagation angle of seismic wave on the responses of the junctions between the culvert components under seismic loads. The results show that the horizontal displacements, the peak values of internal forces under seismic loads increase considerably and nonlinearly with the increases of the height of embankment. The peak values of stresses are sensitive to minor variations of acceleration. And the stresses in the culvert structure are reduced, when the propagation angle of seismic wave increases.