Research of material properties reliance for numerical analysis

The material properties that we use in the numerical analysis, controls the quality of the analysis result directly. The best choice to use the correct properties is that we measure them by ourselves. However, it is sometimes difficult to get them by ourselves because of the problem such as expense, equipment or time. In this paper, the reliance of the material properties used in the numerical analysis for the reliability assessment of POP (package on package) is studied, especially focusing the encapsulant. The result of the numerical analysis with the material properties, that the material supplier announced, did not support the result of the actual hardware testing. Then through the research process, we had focused the material properties, and then we actually measured the material properties with the piece of the actual hardware parts which are constructing this product. As the result, we found the order difference between the material suppliers announced data and our measured data. It is recognized strongly that the reliance of the material properties is extremely important. With this established numerical model, we had studied the optimized parameter of the encapsulant.