2000 Fiscal Year Final Research Report Summary
Mechanical Properties of Ceramic Fibers under a Combined Stress
| Project/Area Number |
10650677
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Composite materials/Physical properties
|
|---|
| Research Institution | Nagasaki University |
|---|
Principal Investigator |
IWANAGA Hiroshi Faculty of Engineering, Nagasaki University, Professor, 工学部, 教授 (40039772)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MOTOJIMA Seiji Faculty of Engineering, Gifu Univ., Professor, 工学部, 教授 (80021608)
|
|---|
| Project Period (FY) |
1998 – 2000
|
| Keywords | Combined Stress / Carbon Fiber / Tensile Strength / Mechanical Proterty |
|---|
| Research Abstract |
Fracture strength of commercial carbon fibers was measured under combined torsion-tension deformation, where a carbon fiber was stretched after twisting many turns around the fiber axis. The tensile fracture strength decreased drastically with increasing number of turns, exhibiting inclined fracture surface. The results of a low modulus pitch-based carbon fiber (XN-05 from Nippon Graphite Fiber Co.) agree quite well with the theoretical relation derived on the assumption that the fracture occurs when the local tensile stress reached a critical stress. This fact is consistent with the fact that the fiber has an almost isotropic amorphous-like structure. The results for a high PAN-based carbon fiber (M60J from Nippon Carbon Co.) consisting of anisotropic graphite layers show a deviation from the theoritical curve indicating an anisotropic strength of the fiber.
|
