Casting material database system is an indispensable part of casting simulation software. For a complete set of numerical simulation software, the completeness of the material content in the database, the reliability of the data, the data manipulation function of the database and the smoothness of the connection between the database and the simulation software have become a very important aspect to measure the database of numerical simulation software and even the good or bad of a set of numerical simulation software.
Foreign numerical simulation software, such as ProCAST and magama, have their own complete database system. Because the standards of casting materials at home and abroad are different, it is impossible to get a simple conclusion about the completeness and reliability of materials in the database. ZHY casting believes that the operation function and connection fluency have reached a high level and feel very humanized in the process of use. As we all know, the physical properties of each material, such as thermal conductivity, specific heat, density, crystallization latent heat, etc., are a function of temperature, and their values change with the change of temperature, so they should also be a variable in the database. In this respect, it is undoubtedly excellent. The physical properties of materials are given in curves or fixed values. At the same time, the database is also characterized by its unique alloy thermodynamics database, that is, the material performance back calculation database. Based on the emerging computational materials science, it is developed by British companies. Using this unique back calculation database, users only need to input the chemical composition of the alloy, The computer can automatically calculate the thermophysical parameters such as liquid and solidus temperature, solidification latent heat, specific heat capacity and alloy density with temperature.
The domestic numerical simulation software is mainly represented by Huazhu, FT star and cast-soft. The database developed by Tsinghua University contains a variety of materials, and it is classified according to the rule of “common materials first, non common materials last”. The values of thermal conductivity, specific heat, density, latent heat of crystallization, liquidus and solidus of each material are given in the table. The content of the database is complete. However, the parameter values of the materials provided are not comprehensive enough, and the database gives a fixed value. Although the difference calculation is used in the program calculation, it will also affect the accuracy of the calculation. For updating, adding or deleting the contents of various materials in the parts database, users can easily simulate and query the parameters of various materials in the database, so the data manipulation function of the database is relatively strong. However, when setting parameters, the simulation software cannot directly call the value of the database. When selecting materials, users need to write down the name of the required materials and fill them in the setting dialog box. This is quite inconvenient, so the fluency of FT Star software database and simulation software is not very good. Castdata / ver2 of cast-soft software The database of 0 also contains more than 100 kinds of materials (including common casting materials), and provides a large number of parameters for each material. The content of the database is relatively complete. The physical properties of each material also change dynamically and temperature. The dynamic link library technology is applied in the program for interpolation calculation, so the data in the database is relatively reliable. The database of cast-soft can realize the functions of simulated query, modification, addition and deletion for most parameters, and users can modify the content of the user library and make some comments. The data manipulation function of cast-soft database is relatively strong. Through the experiments of some examples, it is proved that users can easily select the materials in the database, the connection between the database of cast-soft and the software is smooth, and the overall feeling can meet the current development level of domestic numerical simulation software. The database system of Huazhu CAE (8.0) can complete the functions of material selection, material modification, saving, adding and deleting, and the content of materials is also very rich. In terms of material property value, like the database of Tsinghua numerical simulation software, the parameter value of the material provided by it is a fixed value, which will affect the accuracy of calculation. However, it can directly enter the database in the calculation process, which shows that it has good fluency with the simulation software.