| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
|
|---|
| Research Abstract |
A novel multi-scale computational method using both the asymptotic homogenization method and the finite element mesh superposition method has been developed for various types of composite materials and structures including fiber and particulate reinforced composites and porous materials. In order to verify the numerical simulation via comparison with experimental results or conventional numerical results for real composite materials, a large-scale and high-speed simulator has also been developed.
From the standpoint of object materials, textile reinforced polymer matrix composites such as woven and knitted fabrics reinforced plastics, particulate reinforced metal matrix composites and porous ceramics have been analyzed. A hierarchical modeling was applied to the textile composites consisting of single fibers, fiber bundles and macroscopic structures. The strength evaluation and the process simulation were carried out for the textile composites. Especially, a microstructure-based process
… More
simulation is a new technique, which was verified by the comparison with experimental result. Two types of manufacturing processes of polymer matrix composites were studied ; the one is deep-drawing of knitted fabric reinforced thermoplastics and other is the prediction of permeability for resin transfer molding process. In every simulation including the strength evaluation, complex nonlinear phenomena were considered including damage propagation, solid-fluid interaction and large deformation. Concerning the porous ceramics, the needle-like pores were three-dimensionally modeled using image-based modeling technique. A very large-scale problem with one million finite elements was solved practically on a standard personal computer. The predicted macroscopic properties which reflect the microstructures showed very good coincidence with the measured values.
From the standpoint of the computational method, a new categorization of the microscopic heterogeneity was proposed, i.e., the global heterogeneity and the local heterogeneity. The global heterogeneity can be replaced by the homogenized material model using the asymptotic homogenization method. The local heterogeneity can be directly modeled using the finite element mesh superposition method. The finally proposed multi-scale computational method combines the above both methods. It enables us to analyze the microscopic stresses for cracks, voids, inclusions, interface and interphase, considering the interaction between the local heterogeneity and the global behaviors. Less
|
