Advanced Materials Research Vol. 700

Abstract: Due to limited land resources, spaces under bridge were illegally under used in many cities. Great hazards were existed in such used under bridge spaces. In this article, a certain bridge space was studied, time history curve for the room temperature was obtained by CFD simulation according to the hydrodynamic theory, and the data turned out to be reliable by being compared to the experimental outcomes.

Abstract: The mechanical properties and microstructure of cement stone containing different sodium chloride (NaCl) have been investigated. Uni-axial compression experiments were used to study mechanical properties. The main crystalline phase composition of cement specimens was determined by means of X-ray diffraction (XRD). Surface morphology of cement stone was observed by using scanning electron microscopy (SEM). The obtained results showed that compared with the other samples, the sample incorporated 14% sodium chloride was quite different, whose compressive strength was higher and microstructure was denser. The sodium chloride crystalline phase and the hydration (C-S-H) gel phase co-existed.

Abstract: It is important to enhance the ductility of high strength concrete (HSC), and one possible direction is to use steel fibers reinforced, named steel fiber reinforced high strength concrete (SFRHSC).In this paper, The crack characteristics of steel fiber reinforced concrete is investigated in the SHPB test. The incident wave and transmission wave varying with the time have been obtained by SHPB experiment. The relationship curve for stress and strain of material concrete has also been obtained.

Abstract: In order to guarantee the overwintering safety of 15×10⁴m³ steel crude oil tank, tank structure and material properties were analyzed. A three-dimensional finite element model of the large non-anchoring oil tank was established. Based on the stress analysis, the stress distribution in different environmental temperature and drastically changed temperature was founded. The result of stress analysis indicated that the structure of the tank is safe enough to endure the conditions of winter temperature in Daqing at overwintering stage.

Abstract: This paper introduced compounding method to calculate the SIF of typical MSD configurations. Complex function method was proposed to calculate the modification coefficient of the adjacent holes. Combining the method with compounding method, the SIF calculation of typical MSD configurations was achieved. The calculation process is easy to operate and the results are reliable which can be verified by FEM calculation. By studying the SIF results of typical MSD configurations, a series of conclusions with practical value in engineering can be obtained.

Abstract: Subsea pipeline has been wildly used in the offshore oil exploitation, and its operational safety has profound significance to the subsea oil industry. In this paper, an actual operating subsea pipeline, which is a typical structure of pipe-in-pipe system, is selected as the object of study. Based on finite element method, the stress analysis is carried out. Results show that the residual ultimate strength of the current damaged pipeline is founded and the damage greatly increased the stress state of dented region of the pipeline.

Abstract: Effect of winding tension on elastic modulus of filament wound composite pipes were investigated with experiments in this paper. Three winding tension configuration were utilized and axial tension experiments were carried out. quantity of fiber tension descent from inner to outside in each configuration, which is always used in practices. The result of experiment shows that elastic modulus increase with fiber tension's raising and effect of fiber tension is not too remarkable.

Abstract: The chromium-plating method is proposed to solve the wear and spalling problem of the cold roller in the rolling process. A three-dimensional asymmetric rolling model is constructed by using elastic-plastic finite tool, and the stress on the roller in different plating hardness, thickness and layers in cold rolling process is analyzed. By comparing the simulated results, the optimized state for chromium layer is scheduled.

Abstract: This paper aims at cover body dent resistance optimization problems, developed a whole process method using the finite element simulation method and the corresponding engineering experience to solve the dent resistance problem. Use of Tcl/Tk language to develop the script for fast simulation model consider material nonlinearity and contact nonlinearity, Use Abaqus software to calculate the results, and then customized to optimize use of simplified script parameters on changes in the working conditions of the structure will be optimized. The results show that this set of process optimization method to solve the variable conditions dent resistance is quickly, efficiently and accurately.

Abstract: This paper presents a new method of direct stress test in the core area of CFRP confined concrete short column by using cement-based piezoelectric sensor. The sensors are embedded in the core area of concrete short columns, dynamic fatigue tests are taken on the columns before and after CFRP reinforcement respectively. The results show that an obvious linear relation is found between sensor output signal and test input load, the slope of load-sensor signal curve of concrete short column is larger after CFRP reinforcement, the sensor signal peak is increased with the increase of the loading frequency, but the loading frequency is almost no effect on the increasing extent of the stress, the stresses in the core area of concrete short columns can be significantly improved after the columns reinforced by CFRP, the increment percentages are in the range of 5% ~ 20%.