Applied Mechanics and Materials Vols. 513-517

Abstract: The fatigue strength of the steel hub is important to the safety of the automotive wheel and the dynamic radial fatigue test is also one of the three performance experiments for evaluating the safety of automotive wheel. This paper applied Abaqus in analyzing the static strength of the 13×4.5B automotive steel hub according to the test requirement of national standard, and to calculate the hubs fatigue life by Fatigue. Compare the FEA result and the test result, find the two results are very closer which proved the correctness of the static strength analysis and the fatigue strength analysis, and the FEA simulation can efficiently predict the fatigue life of automotive wheel and it does a good for the wheel design to reduce the design cost and to shorten the development cycle.

Abstract: Study on a steel chimney outer wall with three spiral guide plates in this paper. Research the steel chimney structure stability and static force analysis under wind loads by using ANSYS Workbench and CFX fluid mechanics modular. To prove the steel chimney with three spiral guide plates structure is more safe and stable than the old steel chimney. Provides a new transformation basis of the steel chimney as the ratio of height to diameter is large and low flexural strength.

Abstract: A numerical simulation was carried out for the flow and heat transfer in the Double-Inclined Streamlined Ribs tube (DISR tube) which is used in the automobile exhaust heat recovery. This paper is aimed to find the optimum ribs parameters for best heat transfer perfomance. The solution was calculated by ANSYS/FLUENT and the SIMPLEC algorithm was used for the velocity-pressure coupling. The results shows that the optimal value of DISR tube is rib length (l=38mm), rib inclined degree (α=45o), rib height (h=2.5mm) and rib pitch (P=60mm). The heat transfer in the DISR tube is enhanced 72.6% on average compared with a plain tube and the friction factor increases 180.9% on average at Re=12000~50000. In the DISR tube, the field synergy angle reduce from 90° to 80° and the heat transfer is enhanced significantly. The paper shows that the field synergy angle declines greatly near every ribs, and this is the chief reason for the heat transfer enhancement.

Abstract: The corridor is an important way of evacuation and rescue in building fire. The fire smoke flow prediction software developed successfully was applied to simulate a building with a 28.8 meters long corridor to investigate the effect of the different thermal insulation on fire smoke spread rate. Two representative thermal insulation, external insulation and internal insulation were compared. In 3600s fire time, air temperature in the corridor of external insulation is much lower than that of internal insulation. The air temperature gap gets narrowed between the two insulation methods in the corridor with the prolongation of fire time. Temperature difference increases as the distance increase from the fire ignition place. The corridor gets unsafe of internal insulation in 7 minute since fire ignition, while about half the length of the corridor stay secure of external insulation in 10 minutes since fire ignition. That implies more available safe egress time can be gained with external insulation than internal insulation. Smoke spread rate was numerically compared based on the air temperature variation. Smoke spread rate of internal insulation is much higher than that of external insulation and the corresponding ratio is 1.732:1.

Abstract: The settlement of high fill channels has great influence on the structural stability of the impervious panels in the North Water Diversion Project. For the high fill channels, the settlement study on the filling body and water channel slope of the channels after the completion of the filling is systematically carried out. The study result shows that the post-settlement development law of the channels accord with the hyperbolic, the settlement of the slope is uneven, and the deformation and the deformation rate of the slope is mainly controlled by vertical settling.

Abstract: Thin layer evaporation tests of three types of soil were conducted by a newly designed humidity-controllable evaporation and penetration measuring system and lasted for 8 days. The whole process of sample mass variation from wet to dry was recorded in the laboratory. The critical moisture content and air-dried moisture content were obtained from evaporation curve, which divided the evaporation process of thin layer unsaturated soil into three stages, including stable rate stage, reducing rate stage and residual stage. The soil water characteristic curves of soils were predicted by Arya and Paris model, the results showed that the critical moisture contents of evaporation process were the same with the water contents corresponding to residue values of SWCC, it is significant to studying on unsaturated evaporation process.

Abstract: Curve fitting method is one of the methods that predict and make analysis to the settlement and deformation of unballasted track tunnel project. Based on the measured date of the button of a certain unballasted track tunnels settlement, hyperbolic method and three-point method and Asaoka method were used to predict the settlement and deformation, according to the predicted result, we can get the best predicted method in this paper. The result shows that, on the premise of predictable, to a small accumulated settlement value and a small fluctuation state, the fitting result is close to each other with the prediction of three-point method and Asaoka method, while the result of hyperbolic method made it be the best choice here, as for the greater predicted post-construction settlement value and final settlement value, this method was regarded as a safe and reasonable method, which was regarded as the best one in the above three methods.

Abstract: The shortage of foundation bearing capacity would pose damage to miniature structures on highway, threatening the security of highway. Layered foundations are widely distributed in Northern Anhui, the traditional methods of computing the bearing capacity and additional stress disagree with the situation of complexity and uncertainty multi-layered foundation. To study the characteristics of additional stress and bearing capacity of multi-layered foundation in Northern Anhui using numerical method of FLAC^3D and analyze the influencing factors of soil structure, soil thickness and basis width on the diffusion laws and bearing capacity. The results can be references in the site survey and engineering design of multi-layered foundation.

Abstract: When there is a ramp, the methods of calculating the foundation and pile bearing capacity are different from the plains situation. Many scholars have been studied determination method of the foundation and pile bearing capacity under the condition of slopes. A program is developed based on the results of previous studies, which can calculate the foundation and pile bearing capacity under the condition of slopes. The program using MATLAB software integrates a calculation method of foundation and pile capacity under slope condition. Combined with numerical examples, the results illustrate the upshots of the calculation methods in the program on the basis of the literature by interpolation method with the adjustment coefficients are accurate. And analyzed the influence of slope ratio on the bearing capacity: capacity and slope ratio was negatively correlated, with the slope ratio decreases, the capacity is on the increase, but the degree of increase based on the slope ratio.

Abstract: Active control of vibration has been the subject of a lot of research in recent years. This study presents a fuzzy logic controller (FLC) to minimize structural vibration using collocated piezoelectric actuator/sensor pairs. The proposed fuzzy controller increases the damping of the structures to minimize certain responses. The PID controller is used as a contrast controller to the FLC. The numerical simulation results show that the fuzzy approach is much portable than PID method. In summary, a novel vibration absorption scheme using fuzzy logic has been demonstrated to significantly enhance the performance of a flexible structure with resonant response.