1997 Volume 1997 Issue 181 Pages 261-269
The present paper aims at developing a computer aided design and manufacturing system for advanced composite marine structures, that is, shell structures in which stiffness and strength for outplane pressure and light-weight are achieved by making efficient use of advanced composite materials. In the previous reports, some specialized prototypes of CAD/CAE system for laminated materials were developed by means of object oriented language. It showed that the developed system is effective in designing and analyzing laminated panels.
In this report, specifications of the system are discussed in the point of developing an effective system. Based on the specifications, two points are important in the systems aided for manufacturing, one point is making tool mold with easiness and accuracy, and the other is layup simulation on a curved surface.
The system aided for making tool mold was developed by means of generating surfaces which are apart thickness from the base surface. By using a numerical cutting machine with cutting paths on the offset surfaces, it is available to obtain an accurate male mold, which is achieved smooth outer surfaces.
In order to simulate of prepreg layup process on a curved surface, three deformation mechanisms of laminated materials are investigated in the point of fitability, plastic deformation, shear deformation, and apparently deformation induced to out-plane deformation. According to observations, unidirectional fiber yarn is discrepancy from the curved surfaces without some points, and it induced that fiber wrinkles in a vacuuming process. Then a criterion of fitability is proposed by means of calculating apparently in-plane deformations.
Some examples are demonstrated, and it shows that the developed system is effective in manufacturing simulations of laminated panels.
