| Project/Area Number |
14550083
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kagoshima University |
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Principal Investigator |
TOYA Masayuki Kagoshima University, Faculty of Engineering, Professor, 工学部, 教授 (90026279)
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| Co-Investigator(Kenkyū-buntansha) |
ODA Mikio Kagoshima University, Faculty of Engineering, Research Assistant, 工学部, 助手 (30274856)
ARITOMI Masao Kagoshima University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60094116)
SAITOH Takehiro NEC Electronics Corp., Advanced Technology Division, Leader, 先端技術開発部, 主任
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | laminates / interface fracture mechanics / delamination growth / energy release rate / impact loading / temperatyre gradient / LSI package / 積層材料 / はく離 / 低速度衝撃 / 熱的負荷 |
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| Research Abstract |
1.Delamination growth due to mechanical and thermal loadings is investigated for laminates consisting of two beams with different elastic and thermal properties.Two basic models, which are important for the fracture mechanics of interface of laminates, are analyzed.(1)The low velocity impact applied normal to the surface of laminated beam with an edge delamination is considered.The dynamical response of the beam is analyzed on the basis of the theory of transient vibration due to time varying externally applied force.The condition of the velocity of impacting bar is assumed as such that the velocity becomes constant after some short transient time.The magnitude of impacting force is then determined by making use of Laplace transform method.The bending moments near the edge of delamination are obtained in closed form, from which the energy release rate is calculated.Experiments are also conducted, which show that the predicted response of the beam agree well with the theory.(2)Delamination growth due to temperature gradient is analyzed for the beam with an internal delamination.It is shown that when the temperature gradient is below some critical value the model assuming the contact of the delaminated surfaces is effective and in this case energy release rate is identically zero.However, when the temperature gradient reaches some critical value, local delamination buckling occurs and energy release rate becomes no longer zero ; This implies that the delamination growth would occur only through the local delamination buckling.
2.Numerical analyses based on FEM and experiments are made for delamination growth in large-scale integrated circuits(LSI)plastic packages.Using Kr 85 radioactive tracer techniques, initial sites of edge delaminations occurring during temperature cyclic tests in LSI plastic packages areidentified and the results are compared with analyses.
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