| Project/Area Number |
08045031
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | University-to-University Cooperative Research |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
UJIHASHI Sadayuki Tokyo Institute of Technology, Graduate School of Information Science and Engineering, Professor, 大学院・情報処理工学研究科, 教授 (80016675)
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| Co-Investigator(Kenkyū-buntansha) |
ナッシュ デビッド ストラスクライド大学, 機械工学科, 講師
BANKS William University of Strathclyde, Department of Mechanical Engineering, Professor, 機械工学科, 教授
ローズ ジェイムズ ストラスクライド大学, 機械工学科, 教授
SPENCE John University of Strathclyde, Department of Mechanical Engineering, Professor, 機械工学科, 教授
INOU Norio Tokyo Institute of Technology, Graduate School of Information Science and Engine, 大学院・情報処理工学研究科, 助教授 (70126308)
RHODES James University of Strathclyde, Department of Mechanical Engineering, Professor
NASH David University of Strathclyde, Department of Mechanical Engineering, Lecturer
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Thin-Walled Member / Impact Crushing / Energy Absorption / Drop Weight Test / Composite Material / Measurement System / Temperature Dependency / Scaling Law |
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| Research Abstract |
In the present research, a theoretical mechanism analysis based on plastic hinge models with perfect plastic material properties is suggested in order to estimate the energy absorption abilities of thin-walled circular and square tubes by axial crushing under impact loading. The relationship between dynamic bending moments and angular velocities measured in our previous research is employed instead of the constitutive equations obtained from tensile tests because the main energy absorption in thin-walled tubes occurs by bending work at plastic hinges. On the basis of this procedure, the time histories of the deformation and the absorbed energy can be calculated with good agreement with the experimental results. Crushing periods could not be determined theoretically in the case of square tubes, but were determined in the case of circular tubes. In addition, the axial crushing of thin-welled tubes was carried out successfully taking into account the dynamic relationship between perfect plastic bending moments and bending angular velocities in plastics hinges.
On the other hand, the energy-absorption abilities of thin-walled circular cylinders made from carbon-fiber-reinforced plastic (CFRP) during crushing under impact loading. The tests are carried out with an impact testing machine, the crosshead mass of which is 21.5kg, at a velocity of 8ms-1 under the temperature range 20 to 130ﾟC The ply angles of the specimens are 15 and 75ﾟ, their dimension are 1.2mm in thickness, 30mm in inner diameter and 100mm in length. Load-time and displacement-time profiles are converted to the force and deformation relationship, which manifests the energy-adsorption abilities. The specimens produce two different types of crushing mode and definite constant load levels which keep their energy-absorption ability high. The energy-absorption abilities and the crushing modes of the specimens change at temperatures above60ﾟC.
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