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Three dimensional finite-element analysis of finite-thickness fracture specimens
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Raju, I. S. Newman Jr., J. C. |
| Copyright Year | 1977 |
| Description | The stress-intensity factors for most of the commonly used fracture specimens (center-crack tension, single and double edge-crack tension, and compact), those that have a through-the-thickness crack, were calculated using a three dimensional finite-element elastic stress analysis. Three-dimensional singularity elements were used around the crack front. The stress intensity factors along the crack front were evaluated by using a force method, developed herein, that requires no prior assumption of either plane stress or plane strain. The calculated stress-intensity factors from the present analysis were compared with those from the literature whenever possible and were generally found to be in good agreement. The stress-intensity factors at the midplane for all specimens analyzed were within 3 percent of the two dimensional plane strain values. The stress intensity factors at the specimen surfaces were considerably lower than at the midplanes. For the center-crack tension specimens with large thickness to crack-length ratios, the stress-intensity factor reached a maximum near the surface of the specimen. In all other specimens considered the maximum stress intensity occurred at the midplane. |
| File Size | 1281425 |
| Page Count | 44 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770018633 |
| Archival Resource Key | ark:/13960/t2q57d32h |
| Language | English |
| Publisher Date | 1977-05-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Finite Element Method Stress Analysis Fracture Mechanics Plane Stress Mathematical Models Stress Ratio Stress-strain Diagrams Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
