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A new approximate fracture mechanics analysis methodology for composites with a crack or hole
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Tsai, H. C. Arocho, A. |
| Copyright Year | 1990 |
| Description | A new approximate theory which links the inherent flaw concept with the theory of crack tip stress singularities at a bi-material interface was developed. Three assumptions were made: (1) the existence of inherent flaw (i.e., damage zone) at the tip of the crack, (2) a fracture of the filamentary composites initiates at a crack lying in the matrix material at the interface of the matrix/filament, and (3) the laminate fails whenever the principal load-carrying laminae fails. This third assumption implies that for a laminate consisting of 0 degree plies, cracks into matrix perpendicular to the 0 degree filaments are the triggering mechanism for the final failure. Based on this theory, a parameter bar K sub Q which is similar to the stress intensity factor for isotropic materials but with a different dimension was defined. Utilizing existing test data, it was found that bar K sub Q can be treated as a material constant. Based on this finding a fracture mechanics analysis methodology was developed. The analytical results are correlated well with test results. This new approximate theory can apply to both brittle and metal matrix composite laminates with crack or hole. |
| File Size | 783149 |
| Page Count | 29 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920023286 |
| Archival Resource Key | ark:/13960/t9t19x43w |
| Language | English |
| Publisher Date | 1990-09-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Crack Tips Stress Analysis Approximation Fracture Mechanics Fiber Composites Laminates Brittleness Holes Mechanics Defects Isotropy Cracks Fractures Materials Reinforcing Materials Stress Intensity Factors Metal Matrix Composites Damage Failure Matrix Materials Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
