This paper presents a framework of Information-Based Design Support System (IBDSS) for composite structure design, which is aiming at to improve the design process by alleviating the cost of obtaining the composite properties and the composite material design, automating design iterations in design process, and assisting to tailor material design. IBDSS mainly includes a database of composite unit cell, a reasoning and decision support module and a design and analysis module. The paper specifies problems in composite structure design, and describes the framework of the IBDSS, the logic structure of unit cell library, and its implementation in Java environment with SQL. The reasoning and decision support module with blackboard architecture and the working environment of IBDSS for Internet based design are also presented.

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