Life Predict and Simulation of the Copper Wire in Flexible Printed Circuit Board
Fatigue failure of the circuit board's research focuses on the influence to the circuit board of vibration of rigid circuit board type, distribution of Electronic Components on the board etc. And there is relatively little research to the flexible circuit board's fatigue life research. Local stress-strain method is used to predict the fatigue life. Simulate actual fatigue test load conditions to established finite element model of flexible printed circuit board. Perform fatigue analysis under the periodicity stress. Drawn fatigue life of copper wire in different loading conditions. There is guiding significance to the follow-up test.
Modeling and simulation of the dynamic response of the electronic packaging
Nonlinear laminate theory is applied for the printed wiring board dynamic response modeling and analysis. Equations of motion for the isotropic laminates are derived for free and forced vibration response analysis of the simply supported printed wiring board. The forced oscillation can be caused by the constant impact loading or periodic harmonic loading. Analytical solutions are given to certain loading conditions. Comparisons are made between the response of linear and nonlinear systems in terms of deflection simulation generated from numerical solutions. Results show that a nonlinear system has higher frequency oscillations and lower magnitude than that of the linear system. Nonlinear theory gives more reasonable results for large amplitude deflection under heavy load than that of the linear theory. The theoretical approach in a laminated configuration provides the ability for modal analyses, laminate stresses and interfacial stress analyses of the printed wiring board for reliability studies.
CNC Desktop Vertical Machining Bench Design and Cooling Fluid Application
Today's manufacturing technologies, the human work force is used and at least a minimum level of margin of error is used in CNC machines. Desktop CNC machine tools and CNC machine tools are developed in parallel with the development of personal computers. This study provides CNC training institutions for education, small and medium-sized enterprises for commercial purposes use the low-cost desktop machine has been designing and manufacturing of CNC vertical machining was carried out. Desktop CNC machine tools and production capacity to handle the kind of material was applied to increase the cooling fluid. Through A199 and Fe37 the cooling fluid application desktop CNC machine tools, such as processing of materials that are difficult to successfully processed. Keywords—CNC, Desktop CNC Machine, CNC Design