| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
The extended finite element method (XFEM) was applied to damage propagation analyses of carbon fiber reinforced plastic (CFRP) laminates. The proposed method uses no asymptotic basis functions and uses only the Heaviside function. The crack geometry is approximated by two signed distance functions (SDFs). Elements that include a crack are then classified into several partitioned patterns according to nodal SDF values, and enriched nodes are determined. A cohesive zone model (CZM) is introduced to the crack line or the surface including a discontinuous displacement field modeled independently of finite elements by XFEM. In order to solve the discretized governing equations, the implicit method and the explicit dynamic method are used. Analysis codes were developed based on the proposed method and they were applied to the fracture analyses of CFRP laminates considering interaction between matrix cracks and delamination, and appropriate results were obtained.
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