By using the analysis method, the design is a scientific design method. It is based on the force structure of plastic parts and in the circulation and use of the process of plastic parts, to understand the mechanical load is the stress and the strain generated. The results of analysis of the theory of structure provides a good basis for designing the designer, it can according to the design scheme to decide. With the analysis about two.
  1.Analysis of classic. This is the use of stress and strain on the plastic parts for structure analysis, structure analysis, the most simple is the use of the assumed isotropic, and elastic materials engineering formulas are obtained. Although most plastics do not exhibit linear elastic and isotropic, but if the viscoelastic relation appropriate or use a time dependent stress-strain relationship, also can calculate the unidirectional and multidirectional stress. Usually, with a relatively short hi and low cost can be obtained results. The designer must be checked by the structure analysis of effective stress and strain should be obtained by, the structure is in conformity with the relevant requirements.
  2.finite element analysis. Finite element analysis is an advanced analysis method, it can be complex problems into small problem of a series of interconnected, used to analyze the structure and thermal behavior of plastic parts, used for stress and strain for load and deformation is caused by the hour. Finite element analysis can also be nonlinear stress-strain behavior, is dependent on time, temperature, stress strain behavior, factor anisotropy and hysteresis phenomena into account. Finite analysis results enables designers to understand the high stress area of potential, and the corner radius, wall thickness and other variables to optimize the designer. The necessary sample test does not rule out finite element analysis, it can be through early detection problem areas as sample test target, while analysis the samples. The application of finite element analysis, may be required in the process of new product development test of sample repeat number reaches the minimum. The results of finite element analysis is accurate and reliable, but the workload is large, however, the introduction of the computer greatly improves the computing speed and accuracy, enhance the analysis ability, is the designer of plastic assistant design structure of the. Analysis technology can deal with more complex geometry structure and the stress condition of structure based on the computer, it can be used for occasions classic analysis method is not suitable for the. Because of considering the heat transfer and stress, strain, finite element analysis is particularly applicable to dynamic situations.