1989 Fiscal Year Final Research Report Summary
Structural Application of Sealant to Make Flexible Joint System and Behavior of Joint
| Project/Area Number |
62550414
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Building structures/materials
|
|---|
| Research Institution | Tokyo Institute of Technology |
|---|
Principal Investigator |
TANAKA Kyoji Tokyo Institute of Technology, Research Lab. of Engineering Materials, Associate Professor, 工業材料研究所, 助教授 (40016829)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Hajime Takenaka Komuten Co., Ltd., Takenaka Technical Research Laboratory, Researcher, 技術研究所, 研究員
HASHIDA Hiroshi Tokyo Institute of Technology, Research Lab. of Engineering Materials, Research, 工業材料研究所, 助手 (20175532)
|
|---|
| Project Period (FY) |
1987 – 1989
|
| Keywords | Sealant / Structural sealant / Joint / Connection / Deformation / Load / Shape of bead / Dimension of joint |
|---|
| Research Abstract |
Flexible joints made of sealants with various rectangular cross sections were investigated, and the results obtained are as follows.
(1) Mechanical behavior of a joint with various cross sections Mechanical behavior of a joint was mainly affected by modulus of a joint material and the shape of a bead. As for the latter, stress induced in a bead is depend on the ratio such as depth(D)/width(W) in tensile and compressive deformation, D^2/W in bending deformation. But, no dependence to the shape was observed in shearing deformation.
(2) Stress distribution in a bead deformed Stress in cross sectional area of a bead is gradually increasing from the center to the corner.
(3) Fatigue resistance of joint materials Cracks appeared at the both ends, near substrate, on the surfaces of a bead during fatigue operation, and the number of cycles till cracking (N) can be expressed the next equation , log N = -A log ( D^n/W ) + B :where A and B are constants.
(4) Load-deformation relation of a two dimensional structure with flexible joints Rigidity of a structure is much affected by the shape of a bead in addition to the modulus of a joint material. The structure becomes more rigid according to an increase of D or a decrease of W.
(5) Development of a new flexible joint system Based on the knowledge studied above, a new flexible joint system with higher degree of freedom was developed, and the behavior of the system was investigated.
|
