Composite material repair and reliability
Wu, Edward M.
MetadataShow full item record
Composite structure repair methodology has been developed to specific applications (typically in small area and limited to secondary structure) and is being extended to Large Area Composite Structure Repair (with target extension to primary structures). Therefore, the repair becomes more critical because we get redistribution of stresses that can also affect the zones outside of the repair area. For this reason, an analytic evaluation of the repair's reliability has to be performed to define a parameter which reflects on the effectiveness of the repair. In this work, we establish a principal guideline to evaluate the redundancy and compare the reliability of the repair to the reliability of the parent structure (i.e., the structure in the undamaged state). The approach adopted is to utilize structural finite element analysis to compute the state and of the candidate repaired state. The reliability of these two spatially non-uniform stresses is computed by a probabilistic failure criterion. Thus, we can optimize the repair configuration by varying the strength and the stiffness of any element in the repair site by varying the lamination angles, and selectively using hybrid materials.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Analysis of maintenance records to support prediction of maintenance requirements in the German Army Hartmann, Jens. (Monterey, California. Naval Postgraduate School, 2001-06);Today the German armed forces are faced with a broad, varied and graduated range of tasks including missions outside Germany. A major challenge in planning the force structure for missions like the one in Kosovo is to ...
Schoch, Eric J. (Monterey, California. Naval Postgraduate School, 2003-09);The F/A-18E/F is the latest multi-mission tactical aircraft to enter United States Naval Service. It generates power via two F414-GE-400 engines, each of which is composed of six modules. In addition to a new aircraft model ...
Using dynamic sustainment to determine the impact of varying levels of reliability on future combat systems maintenance requirements Dozier, Pamela C. (Monterey, California. Naval Postgraduate School, 2006-12);The primary purpose of this thesis is to provide analysis for future reliability studies. This thesis assesses the value of the Dynamic Sustainment simulation model as a logistics modeling tool and demonstrates data ...