Abstract
Experimental results showed that ASTM D 638 Type IV flat tension specimens, made of a Nylon-11 matrix containing a large volume concentration of Nd-Fe-B particulates, failed at a location where the straight gage section of the specimen ends and the curved transition region begins. The stress distribution in this specimen was analyzed using the finite-element method, and it was found that there is a stress concentration at this location. The stress distributions in tension specimens with both single- and double-arc transition regions were analyzed and stress concentration factors were calculated. A linear relationship between the magnitude of the stress concentration factor and the ratio of the width in the gage section and the arc radius of the transition region is identified. This study shows that it is possible to reduce the magnitude of the stress concentration factor for the ASTM D 638 Type IV flat tension specimen by redesigning the specimen geometry without changing its overall size.
| Original language | English |
|---|---|
| Pages (from-to) | 52-57 |
| Number of pages | 6 |
| Journal | Journal of Testing and Evaluation |
| Volume | 31 |
| Issue number | 1 |
| State | Published - Jan 2003 |
| Externally published | Yes |
Funding
A portion of this research was sponsored by the User program of the High Temperature Material Laboratory of Oak Ridge National Laboratory and by National Science Foundation Grant 9983582 (Dr. K. P. Rajurkar, Program Director).
| Funders | Funder number |
|---|---|
| National Science Foundation | 9983582 |
| Oak Ridge National Laboratory |
Keywords
- Finite-element analysis
- Stress concentration factor
- Tensile strength