1996 Fiscal Year Final Research Report Summary
Rate Dependent Compressive Strength of Polymer Composites
| Project/Area Number |
08044124
|
|---|
| Research Category |
Grant-in-Aid for international Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Section | Joint Research |
|---|
| Research Field |
Aerospace engineering
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
TAKEDA Nobuo Professor, Center for Collaborative Research, The University of Tokyo, 国際・産学共同研究センター, 教授 (10171646)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Takashi National Aerospace Laboratory, 航空宇宙技術研究所, 室長
OGIHARA Shinji Research Associate, Science University of Tokyo, 理工学部, 助手 (70266906)
WAAS A. M. Associate Professor, University of Michigan, 工学部・航空宇宙工学科, 副教授
|
|---|
| Project Period (FY) |
1996 – 1997
|
| Keywords | Polymer Composites / Compressive Strength / Glass Fiber / Carbon Fiber / Split Hopkinson Pressure Bar / Rate Dependence / Temperature Dependence / Fiber Volume Fraction / Failure Process |
|---|
| Research Abstract |
Development of advanced fiber reinforced high-temperature polymer matrix composites is a key for establishment of future hypersonic aerospace transport systems. Among all, compressive strength properties are essential for load-bearing structual members. However, since there exist many influential factors to determine the compressive properties, few systematic studies have been conducted on the rate dependent compressive strength of composites.
The purpose of the present study is to experimentally characterize the effects of strain rate, temperature, and fiber volume fraction (VィイD2fィエD2) on the compressive strength of polymer matrix composites, using the modified split Hopkinson pressure bar (SHPB) apparatus developed at Center for Collaborative Research, the University of Tokyo. In addition, theoretical considerations were conducted to explain the major influential factors determining the compressive strength properties.
The same vinyl ester matrix was used in both carbon and glass fiber unidirectional composites with various VィイD2fィエD2 ranging from 0 to 60%. similar data were obtained for both carbon and glass fiber composites. As the VィイD2fィエD2 increased, the failure pattern changed from ductile to brittle manner, and the strength increased non-linearly. As the strain rate increased from 10ィイD1-3ィエD1 to 10ィイD13ィエD1/s, the strength increased by 0.4 times. As the temperature increased from 20 to 100℃, the matrix softening was noted, which resulted in the change in failure pattern from kinking to micro-buckling.
|
