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An equation for bolt clampup relaxation in transient environments
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Shivakumar, K. N. Crews Jr., J. H. |
| Copyright Year | 1982 |
| Description | An equation for bolt clampup relaxation for transient temperature-moisture (T-M) conditions was derived starting with a relaxation equation for steady-state conditions, and then using an incremental time approach that exploits the superposition principle for linear viscoelasticity. The resulting equation uses the initial T-M condition (at the time of clamping), the T-M history after clamping, and elastic clampup coefficients for temperature and moisture changes. For a given material and joint configuration, the clampup coefficients are constants that can be calculated by elastic analyses. The clampup equation was used to calculate the changes in clampup occurring in a T300/5208 graphite/epoxy joint exposed to a one-year history of temperature and moisture. Two cases were considered: one was a dry joint exposed to a relatively humid environment and the other was a nearly saturated joint exposed to an arid environment. |
| File Size | 533303 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820017451 |
| Archival Resource Key | ark:/13960/t1fj7906w |
| Language | English |
| Publisher Date | 1982-04-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Finite Element Method Viscoelasticity Relaxation Mechanics Joints Junctions Temperature Effects Moisture Bolts Graphite-epoxy Composites Mathematical Models Laminates Clamps 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 |
