Applied Mechanics and Materials Vol. 487

Abstract: Laminated glass which consists of two glass sheets connected to each other with PVB interlayer is used in many engineering applications for years. Despite the long history of the use of laminated glass in buildings there are serious problems about delamination of laminated glass units. This paper provides information about delamination issues of laminated glass plate structures. Delamination of laminated glass unit may be due to the thinning of PVB (Polyvinyl Butyral) interlayer or the folds which occur during the manufacturing process. Laminated glass behaves in a complex manner due to the effect of geometry that undergoes large deflection even under their own weight and the order difference between the elastic modulus of glass and interlayer. Because of the mentioned reasons large deflection analysis has to be performed in the determination of the effect of delamination on the strength of laminated glasses.

Abstract: 316L stainless steel is a common material in nuclear power equipments. Intergranular corrosion is a hidden and destructive mode of material failure. It is important to study the intergranular corrosion behavior of the 316L to ensure the safety of nuclear power equipments. A series of research has been conducted on properties of 316L including the microstructure of the base metal and the weldment and that under the condition of intergranular corrosion. Through the experiments, an intuitive understanding of the microstructure of the base metal and the weldment has been established. Moreover, the intergranular corrosion resistance can be reflected by the condition of grain separation on metallograph. In resistance of intergranular corrosion, by comparison, the heat affected zone was the worst and the weld joint performed quite well. Thus, the heat effect in welding process must be controlled to improve the intergranular corrosion resistance of the equipment.

Abstract: For deep application of the FEM on the study of cutting mechanism of SiCP/Al, the article completed the algorithm to generate the mesoscopic model of SiCP/Al with the parameterization of the shape and volume fraction of SiC based on the ABAQUS scripting language python. Two-dimensional randomly distributed circular particles model, circular mixed with regular polygon particles model and arbitrary polygon model are generated with volume fraction of 30% and cutting simulations were carried out on the models. Results show that cutting force of SiCP/Al with uniform distribution and size of circular particles will be relatively stable and during the cutting process, stress field changes with the shape and distribution of the particles and the relative position of the particles and tool. Poor surface quality was mainly caused by the interaction among the tool, the particles and the matrix material.

Abstract: Main effects contributing to the quality of surface roughness on an etched aluminium metallization wafer using Reactive Ion Etching (RIE) was studied. A total of three controllable process variables, with eight sets of experiments were scrutinized using an orderly designed design of experiment (DOE). The three variables in the investigation are composed of CF₄ gas, composed of O₂ gas and RF power while time is constant. The estimate of effect calculated for composition of CF₄ gas, composition of O₂ gas and RF power are-2.205, -0.975, and-0.525 respectively. All factors gave negative effects. This implies that the surface roughness increases when the content of CF₄, O₂, and RF power is lower. The results suggest that the composition of CF₄ gaseous as the most influential factor as its main effects plot has the steepest slope followed by oxygen and RF power.

Abstract: Laser cladding is an advanced material processing technology that has potential to improve the performances of metals. To improve the hardness and wear resistance of the surface of Magnesium alloy, SiC-316L composite coating on AZ31 magnesium alloy by laser cladding was generated, and the composition and properties analysis of the cladding coating were conducted. The results show that the laser cladding coating and the substrate achieve a good metallurgical bonding. The growth morphology of boundary is mainly branch dendrite.When the laser power is 1250 W, spot diameter is 2mm, scanning speed is 25 mm/s and average energy density is 2.5×10⁴J, the cladding layer possesses the best micro-hardness, about 3 times as hard as the substrate.

Abstract: In this research, Fluoridated hydroxyapatite bio-ceramic coatings were produced by laser cladding on the titanium alloy with hydroxyapatite and CaF₂ as raw materials. The microstructures and phase constitutions of coatings were characterized by OM, SEM, EDS and XRD, the mechanical properties was investigated by micro-hardness and simulated body fluid immersion test. The results indicated that Fluoridated hydroxyapatite bio-ceramic coatings with anticipated structure and properties were achieved successfully by laser cladding on the titanium alloy. Compared with CO₂ laser, the FHA coatings prepared by fiber laser had better deposition of biological activity phase.

Abstract: This paper investigates the factors that affect the surface roughness on a Platinum deposited wafer after reactive ion etching (RIE) using a combination of SF₆ and Argon gaseous. A total of three controllable process variables, with 8 sets of experiments were scrutinized using a systematically designed design of experiment (DOE). The three variables in the investigation are ICP power, Bias power, and working pressure. The estimate of the effect calculated for ICP power, Bias power, and working pressure are-4.9288, -6.2383, and-4.7223 respectively. All three factors gave negative effects. This implies that the surface roughness decreases when ICP power, Bias power, and working pressure is high. The Bias Power is the most influential factor followed by ICP Power, and working pressure.

Abstract: This paper presents the interaction relationships between Tetrafluoromethane (CF₄) gas, Oxygen (O₂) gas, and RF power in response to the surface roughness of an Aluminium deposited wafer after being etched using Reactive Ion Etching (RIE). The investigation was done using the three factors full factorial design of experiment (DOE). Analysis was done qualitatively by plotting the main interaction plots. The results suggest that strong interactions are present between CF₄ and RF power, CF₄ and O₂, and also O₂ and RF power due to the intersection of the graphs. This implies that all three factors have interaction between each other towards the surface roughness on the deposited Aluminium after RIE.

Abstract: To increase the service life of the die in blanking stainless steel plate, this paper tries to optimize the blanking die. By adopting reasonable lifting and pushing structure in the die to realize up-put the concave and down-lie the convex which adds the sharpening repair times of concave-convex die. The study finds that the die is easy to operate and maintain and has the character of repeating sharpening repair after one-time heat treatment, which can greatly prolong the dies service life and is suitable to bulk blank stainless steel plate.

Abstract: In the process of micro-cutting for the precision small parts, one of the main problems is the micro burrs. The finite element software Abaqus was used to simulate the micro-cutting process of aluminum 2024-T3. To create this model, Johnson-Cook (J-C) model was used to establish the material model, and Arbitrary Lagrangian Eulerian (ALE) method was used to separate the chip from work-piece. The contact friction models which was used between chip and tool was the modified Coulomb friction law. The formation process of micro burrs was simulated dynamically, and the effect of different cutting parameters and tool geometry parameters on burrs forming was analyzed. Furthermore, the general law was obtained. The results provide the guidance for optimizing the tool geometry parameters and cutting parameters to reduce the burrs in micro-cutting with the high surface quality.