Applied Mechanics and Materials Vols. 727-728

Abstract: For environmental protection and sustainable development, many research studies have been carried out on the utilization of waste materials in construction such as fly ash, mine tailings, slags, construction and demolition waste, wood sawdust, rice husk ash, crumb rubber and etc. In this study, two types of waste seashells; green mussel and cockle were tested experimentally to replace fine aggregate in cement mortar. The compressive strength of the cement mortar with seashells were compared with those of a control mortar that was made of a conventional river sand. The main parameter of this study was the proportion of ground seashells used as sand replacement (25%, 50%, 75% or 100% by weight). Incorporation of cockle in cement mortar resulted in higher compressive strength as compared to conventional mortar up to 110 percent. However, incorporation of green mussel resulted in decrement in compressive strength by 67 percent. The results indicate that ground seashells can be applied as a sand replacement in mortar mixes and may improve the compressive strength of rendering and plastering mortar.

Abstract: According to the characteristics of mechanical response of titanium alloy, a new constitutive model for ultra-high strain rate deformation in the process of laser shock peening was established. The constitutive model parameters were obtained by the inverse optimization. The propagation characteristic and residual stress-strain distribution under the shock wave were analyzed. The relationship between residual stress and laser power density and laser impacts was indicated via sensitivity analysis of laser parameters. According the above conclusions, the laser shock peening technic on the titanium simulated blades was optimized to obtain the appropriate residual stress distribution. The fatigue test result indicated that the fatigue strength by the optimized technic was improved by 25%, compared to the anterior technic without optimization.

Abstract: The 87% rolling reduction cold-rolled grain-oriented Fe-3%Si steel (Hi-B) was selected as the experimental materials. As the condition of Goss component in primary structure plays a significant role for its abnormal growth in the subsequent secondary recrystallization, static magnetic annealing was used to affect Goss texture and another main texture (111)[112] development in primary recrystallization in this article. It is found that magnetic field annealing can alter the texture development to a certain extent.

Abstract: To prepare materials for sheetmetal unfolded based on CATIA software became an important link in processing and forming of sheetmetal parts. In this paper through the research of practical problem encountered in the process of sheetmetal unfolding preparation in aircraft manufacturing enterprises, introduce and prove the influence of sheetmetal unfolding coefficient on the preparation of raw materials; through analysis of external factors like the characteristics of materials and ductility of sheetmetal, developed a suitable method to calculating the length of sheet metal stocks. It greatly enhanced the level of sheetmetal manufacturing in aircraft manufacturing enterprises, meet the requirements needed on sheetmetal processing, and bring about the technology expand from theory to practice.

Abstract: In order to obtain an orientation error of planar feature accurate, a method to evaluate it using convex hull is proposed. Firstly, a convex hull is established based on a set of measured points on the planar datum feature by the coordinate measurement machine (CMM). Then, the datum simulator is determined by the vertices of the convex hull with taking maximum material requirements (MMC) into consideration. Afterwards, allowable variation range of the locating features is derived with relative to the datum simulator. Finally, orientation error is evaluated based on convex hull constructed by measuring points of the location feature.

Abstract: Based on the indirect thermal-stress coupled strategy that the first analysis was temperature field and the second analysis was stress field, the process induced residual stress/strain of composite parts with zinced sheet and TPO was numerical simulated by ANSYS software. Moreover, history of residual stress/strain at along fiber orientation and vertical fiber orientation composite material were analyzed. Compared to the forming of composite material part in test, the validity of the results calculated by model was proved.

Abstract: Today, we attach great importance to environmental protection, emphasizing green materials. Extensive long-term changes in the furniture industry production mode, and create green furniture industry, the most important is the use of environmentally friendly materials. This paper makes a brief introduction to the status of raw materials of traditional furniture manufacturing, and then discusses the environmental protection materials for furniture made ​​systematic.

Abstract: In this paper,the micro-arc oxidation technology were utilized to fabricated the oxidation coating in order to resolve the corrosion resistance of the Mg-Al-Y alloy. The EDTA-2Na solution was introduced into the electrolyte solution for improving the coating corrosion properties.After the micro-arc oxidation process, phase structural, surface morphology and corrosion resistance of the MAO coating of Mg-Al-Y alloy were performed by XRD, SEM and Potentiodynamic polarisation measurements. The introduce of EDTA-2Na in the electrolyte solution improve the positive potential and reduced the corrosion current, which would improve the corrosion resistance properties of the Mg-Al-Y alloy.

Abstract: Femtosecond laser is now widely used in micro holes drilling because of its unique advantages, such as high efficiency, high precision and non-contact. Femtosecond laser is the best choice to fabricate micro holes. This paper makes a systematic study of the influence of laser power and number of pulses on diameter and depth of micro holes on S136 die steel through the focusing lens with focal length of 35 cm. A series of high-precision micro holes with different diameter and depth are fabricated. The relationship between the dimension of fabricated micro holes and the process parameters is determined.

Abstract: Selection of eight kinds of process parameters were performed on cast aluminum alloy ZL114 8mm thick plate cylinder and 5mm flat laser - arc hybrid welding, weld microstructure by comparing the morphology and size, considering the cost of internal defects and workmanship proposed to optimize the process parameters programs, microhardness and other properties of the weldment joints specimens tensile strength.