Advanced Materials Research Vols. 317-319

Abstract: The electrochemical behaviour of a new type Al-Zn-In-Mg-Ti-Ga-Mn anode suitable for deepwater cathodic protection was investigated. The current efficiency experiment was carried out in various simulated deepwater environment, and the EPMA and SKP technologies were also used. The results showed that the anode had uniform dissolution morphology in simulated deepwater environment. The current efficiency was always higher than 90% in all the experiment conditions.

Abstract: Experimental study had been done to investigate the fatty acid (FA) content of the linolenic acid-amylose complexes which were prepared at different crystallization temperatures, holding time and amylase-linolenic acid ratio. The results showed the optimum conditions to make linolenic acid-amylose complexes were as followed: 80°C of crystallization temperature and 1.5h of the holding time，amylase-linolenic acid ratio of 9:1. Fatty acid composition of the complexes and physical mixtures before and after the heating destruction was detected by Gas chromatography-mass spectrometry (GC-MS). The results showed the complexes maintained higher oxidation stability than the physical mixtures.

Abstract: This paper introduces an experimental design and evaluation of two newly developed conformable vices. One conformable vice is sheet metal vice and the other is ball bearing vice, these two conformable vices are designed for holding complex-shaped components. The experimental investigation is performed by comparing the conformable vices against a standard vice in static performance and machining performance. Force signals are monitored during experiments. From the comparison, the performance of the two conformable vices is discussed. The results prove that the two conformable vices can be applied for clamping components with performance comparable with a standard vice.

Abstract: It requires a damage tolerance assessment for all airframes and engines to set the inspection windows for safe operation. A certain rotorcraft main rotor yoke were analyzed with NASGRO model. The sensibility analysis of influence parameters in crack growth life has been done. In order to calculate the sensibility index of influence factors to crack growth life, the factors were divided into input parameters and crack growth model parameters. The results show that the input parameters have the following precedence ordering: fatigue crack growth threshold, fracture spectrum, initial crack, fracture toughness, the sensibility values are 11.25, 8.5417, 0.8333, 0.1125, respectively. The NASGRO model parameters have the following precedence ordering: n, p, C, q. the sensibility values are 6.0417, -3.9583, 1.25, 0.1812, respectively.

Abstract: Warpage is a common defect resulted from uneven thermal shrinkage during injection molding process. In this paper, the authors investigated finite element method to predict the warpage of injection moldings with thin shell theory. In order to improve calculating accuracy, discrete Kirchhoff element combined membrane element with rotational degrees of freedom was used to build finite element model. The results predicted with this model were compared with experimental data. The results showed that this finite element model was effective to increase the prediction accuracy of the warpage because of bring transfer matrices to improve the element accuracy.

Abstract: According to the principle of parametric curve paths CNC interpolating, a real-time interpolation algorithm based on algebraic index of the micro-segment spline is presented. It’s used to solve the problems of Hermite polynomial interpolation algorithm, which are commonly slow recursive algorithm, poor accuracy of approximation and the limitations of constant parameters increment interpolation. And the constant interpolation is achieved by fitting a first-order Taylor Formula. Simulation results show that the algorithm shortens the interpolation time and also improve the interpolation accuracy; meanwhile, it maintains the stability of the feed rate.

Abstract: By analyzing the relative position between tool and workpiece in assemble model of finite simulation, and loading the tool with parallel motion and rotation, a finite element model based on trochoid motion is built. In order to reduce the simulation time and errors advanced meshing method was used to optimize the finite element model. This paper considers performance parameter of the workpiece, and researches a simulation of milling force on the Aero-aluminum Alloy 7075-T7451 by using ABAQUS. The milling force finite element model was verified to be feasible, and the result is reliable.

Abstract: Lightweight design was carried out in order to meeting the requirement of long endurance. Structure form was designed based on loading characteristics. Rationality of structure form was verified by finite element method and static tests, which proved deformation of wing measuring up mechanical properties of cell panel. Finite element modal analysis was performed. Then mode test was carried to correcting analysis results. Low order modes by testing are coincided with that computed in finite element method (FEM).

Abstract: With the flange deformation in the deep drawing process of prefabricate-holes part, makes the area around the prefabricate-hole as the research object, the mechanical model was established, using analysis software of Dynaform to simulate and analyze, explore the stress-strain distribution rule of the deep drawing process.

Abstract: The ultra-low carbon high strength weathering steel was trial manufactured. By Optical micrographs observation, scanning electronic microscope (SEM), transmission electronic microscope (TEM), accelerated corrosion test, the corrosion resistant performance of test steel and CortenB steel were studied. The results showed that yield strength, tensile strength, elongation and -40 °C impact energy of test steel reached 510MPa, 600MPa, 22% and 115J, respectively. Corrosion resistance of test steel was superior to that of CortenB. The microstructure of ferrite and bainite, quickly forming adhesive dense rust layers to improve the corrosion resistance of test steel.