Loading...
Please wait, while we are loading the content...
Testing and analysis of composite skin/stringer debonding under multi-axial loading
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Minguet, Pierre J. O'Brien, T. Kevin Cvitkovich, Michael K. Krueger, Ronald |
| Copyright Year | 1999 |
| Description | Damage mechanisms in composite bonded skin/stringer constructions under uniaxial and biaxial (in-plane/out- of-plane) loading conditions were examined. Specimens consisted of a tapered composite flange bonded onto a composite skin. Tests were performed under monotonic loading conditions in tension, three-point bending, and combined tension/bending . For combined tension/bending testing, a unique servohydraulic load frame was used that was capable of applying both in-plane tension and out-of-plane bending loads simultaneously. Specimen edges were examined on the microscope to document the damage occurrence and to identify typical damage patterns. The observations showed that, for all three load cases, failure initiated in the flange, near the flange tip, causing the flange to almost fully debond from the skin. A two-dimensional plane-strain finite element model was developed to analyze the different test cases using a geometrically nonlinear solution. For all three loading conditions, principal stresses exceeded the transverse strength of the material in the flange area. Additionally, delaminations of various lengths were simulated in two locations where delaminations were observed. The analyses showed that unstable delamination propagation is likely to occur in one location at the loads corresponding to matrix ply crack initiation for all three load cases. |
| File Size | 3883613 |
| Page Count | 59 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990025561 |
| Archival Resource Key | ark:/13960/t7bs3qs1c |
| Language | English |
| Publisher Date | 1999-02-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Stress Analysis Fracture Mechanics Skin Structural Member Two Dimensional Models Flanges Axial Loads Tests Finite Element Method Debonding Materials Plane Strain Composite Structures Damage Stringers 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 |
