Advanced Materials Research Vols. 189-193

Abstract: The functions of hydroentangled nonwovens are determined by the degree of the fiber entanglement, which depend mainly on parameters of the water jet. According to the spun lacing technology, this paper set up the numerical model based on the simplified water jetting model, establishing the governing equations, and the blended two-phase flow as the multiphase flow model. This paper simulation the water needle after the water jetting from the water needle plate in the different pressure (100bar, 60bar, 45bar, 35bar).

Abstract: Based on the piezoresistive function character and the conductivity of carbon fiber smart layer (CFSL), a novel electrical resistance tomography (ERT) system of spherical and cylindrical CFSL has been developed for global health monitoring. Based on the background of the third generation nuclear containment vessel, CFSL is stuck on the surface of the structure, and the effectiveness of the ERT system is verified by virtual experiment. The image reconstruction results show that CFSL on two-dimensional curved surface has good sensing characteristics in the complex strain state. Compared with structural volumetric strain in the monitoring area, it indicates that the high electrical resistance of CFSL is distributed in the high strain area of structures, and the low electrical resistance of CFSL is just distributed in the low strain area of structures. Therefore the resistivity’s distribution of CFSL can reflect qualitatively the structural volumetric strain field.

Abstract: In this paper, the jerk-limited feedrate planning is used to adaptively change feedrate with consideration of machine dynamics in the sensitive corners. The curvature is introduced to detect sensitive corner by the look-ahead module to avoid the situation that the curvature is zero. The parameters of every deceleration stages are solved with a series of formula first, and then the feedrate profile is discretized with consideration of the deceleration time, which must be an integer multiple of the interpolation sample time. In addition, the deceleration start point estimation method is described in detail, and a number of deceleration terminal speeds are added into the discrete feedrate profile to drive the machine tool to the right position.

Abstract: Since it is inconsistent and uncontrollable in the experiment, any variance in specimen dimensions, welding parameters and testing conditions will influence the consistency of testing results to some extent. In this paper, the Finite Element Method(FEM) is employed to solve this problem. A three-dimensional finite element model is established to simulate the deformation of I-steel during gas tungsten arc welding (TIG) with FEM software, which is set up to analysis the deformation of I-steel with different welding sequences.

Abstract: Based on cellular automata, a model of simulating grain growth is established to study the effects of the second phase particle’s size and volume fraction on grain growth. The simulation results show that the smaller is the volume fraction of second phase particle, the finer is the grain of pinned matrix, and the pinning force of bigger second phase particle is stronger than that of smaller one. The correlative laws obtained from the simulation is in accordance with the theoretical models.

Abstract: For better understanding the expansion order effect on the residual contact pressure between tube and tubesheet, numerical simulations of multi-tubes expansion were performed by using ANSYS software. Two sets of different materials of tubes and tubesheets under different expansion orders have being analyzed in the present paper. The simulation results show that the residual contact pressure between one tube and the tubesheet decreases with the increasing number of expanded tubes around it, and reaches a certain value gradually. The expansion order of “top to bottom, left to right” which is used in the actual production process can provide a higher residual contact pressure than other expansion order by comparing the results of two different expansion orders. The material properties of tube and tubesheet have significant influence on the residual contact pressure when the expansion pressure is the same.

Abstract: In this paper, the chromatic aberration estimator of touch panel (TP) decoration film by using neural network is presented. Through the training of neural network, the complex relationship between the chromatic aberration and the parameters of evaporation process of TP decoration film is expected to be found. Thus, an intelligent decision mechanism for the chromatic aberration of TP film on its evaporation process could be developed. Based on this mechanism, the technician could set the control parameters of evaporation in advance so that the quality of chromatic aberration of TP could meet the customer’s request.

Abstract: In the paper, it analyzed the influence of gear stress for different design parameters of modified internal gear with ANSYS software. Though specific examples, the diagram of the relation between design parameters and stress was obtained, and some useful conclusions were provided for internal meshing gears transmission reference in design.

Abstract: By using virtual prototype technology, a model of Embedded Vane Rotary Compressor has been established for motion simulation. Based on theoretical analysis and simulation, the motion characteristic, forces and connection constraints was studied and analyzed. The results are helpful for improving the design and performance of the compressor.

Abstract: The paper discusses CAD design on the pores created with simple units such as cylinder, whose structures are determined by unit space array mode and size. Pore ratio, independent to unit models, only relates to orifice diameter and scanning space in fused deposition manufacturing (FDM). Mechanical strength is measured to verify the influences of array modes and inside sizes. The tests demonstrate that 0/90°array mode has larger strength and that the cylinder bears the more pressure along the axis. Stress-strain curve reveals the 4 sections when the parts deform, including linear stage, slightly change stage, increasing stage and damage stage.