Logic Data Model Used to Describe the Whole Lifecycle of Materials

Materials database is widely used in materials science nowadays. It can be used to manage the lifecycle of materials, to accomplish the material data sharing, and to save time and cost spending on experiments for users. However, since properties of materials are often affected by the constructed structures and their service environments, it is difficult to describe those properties properly by database. Fortunately, the logic data model is very helpful in describing and managing the whole lifecycle of materials, from the beginning of materials production, to structure construction, till the failure of structure and materials. Usually, LDM describes data in three steps. Firstly, it collects data from different resources including experiment result data, basic scientific data (such as basic properties, structures and chemical composition, etc), regular numeric methods and information about their service environments, and so on. Then, it organizes all the collected data using an object-oriented design method and unified logic language. At last, the organized data is saved in a data warehouse using more abstract, more unified and stable structures. Thus, it can support many analysis methods, and build the former basis for realizing intelligent application, and suppose an efficient way to manage and analyze the experiment data. This paper has built a LDM for the service safety evaluation of civil buildings. This model is expressed by model specified definition language, which has super classes, classes, objects and their interactions and constraints etc. Several super classes are derived from the procedure of the service safety evaluation. They are evaluation objects (interest objects), evaluation activities, and properties. Thus, a network, reflecting the elements´ relationships we interested in, has become true. It describes the logic relationships of data and supposes a background meaning to each data, which the LDM just works on. This paper focuses on how to accompl- ish the LDM. By using this model, the description of the data in materials database becomes very easy and simple. Furthermore, properties of any materials can be traced properly, which is very important to batch processing the defected components.