2005 Fiscal Year Final Research Report Summary
Evaluation of complex time-dependent stress field and reduction of loss energy for viscoelastic laminated tires
| Project/Area Number |
15360060
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Materials/Mechanics of materials
|
|---|
| Research Institution | Aoyama Gakuin University |
|---|
Principal Investigator |
TAKASHI Masahisa Aoyama Gakuin University, College of Science and Engineering, Professor, 理工学部, 教授 (60082799)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MISAWA Akihiro Kanagawa Institute of Technology, Department of Mechanical Engineering, Professor, 機械工学科, 教授 (00148123)
MURASAWA Go Yamagata University, Faculty of Engineering, Assistant, 工学部, 助手 (90348467)
YONEYAMA Satoshi Osaka Prefecture University, College of Engineering, Assistant Professor, 大学院・工学研究科, 講師 (90306499)
TANAKA Hideaki Aoyama Gakuin University, College of Science and Engineering, Assistant, 理工学部, 助手 (70082865)
CHO Hideo Aoyama Gakuin University, College of Science and Engineering, Assistant, 理工学部, 助手 (60296382)
|
|---|
| Project Period (FY) |
2003 – 2005
|
| Keywords | strength of materials / viscoelastic materials / loss energy / experimental stress analysis / optical measurement |
|---|
| Research Abstract |
Techniques for stress/strain analysis in viscoelastic materials give the various knowledge to design composite structures of tires and to reduce running resistance of tires. In the present research, digital holography and digital image correlation method were developed to analysis the stress/strain field in viscoelastic materials. The experimental results show that the digital holography has accuracies of 30nm in displacement measurement and of 7.5×10^<-6> in strain measurement. These accuracies are enough to measure the displacement field in viscoelastic materials. And, the experimental data obtained by digital image correlation method shows that the method can measure the full field displacement in viscoelastic materials in real time, even if the materials are subjected large deformation. These developed techniques were also applied to fracture mechanics and the authors showed that the techniques are useful to determine stress intensity factors. On the other hand, the authors developed experimental-numerical hybrid technique because it is difficult to analyze stress state in viscoelastic material only from experimental displacement data. In the developed hybrid technique, finite element model of viscoelastic object is constructed, and then, the measured experimental displacement data is inputted on the boundary of the constructed finite element model. Consequently, the stress and strain fields in the viscoelastic object are simultaneously calculated. The results show that the stress and strain fields in the viscoelastic object under non-proportional loading can be analyzed exactly by the proposed technique.
|
