Language: English
ISBN/ISSN: 7807340142
Published on: 2006-01
Paperback
The objectives of the book were to develop a methodology for fatigue reliability and lifetime prediction of metallic aircraft components (such as wing and engine disk) within the framework of condition based maintenance. Toward this aim, a simple scheme for stress and crack analysis based on the finite element method of lines (FEMOL) was developed and combined with fatigue reliability modeling using the first order reliability method (FORM). As proof of concept, the combined techniques were applied to a test case consisting of fatigue reliability assessment of a crack emanating from a weep hole in a C141 airplane wing. A novel method of fitting a closed form mathematical expression for POD to experimental C-scan inspection data from C141 weep holes was used in the analysis. The another objective of the book was to analyze disk structural integrity using large deformation theories.
For specificity the book focuses on the development of cracks. The techniques and instrumentation for flaw detection are discussed, and the topics include measurement models, laser based ultrasonics, neural networks and integrated microsensors. Then, the use of condition monitoring in the assessment of residual structural reliability were discussed. The topics in this book include probabilistic fatigue methods and fatigue reliability. The beneficial effect of inspections with a prescribed probability of detection on the probability of failure is demonstrated for the example of cyclic loading of a component containing an edge crack. The inspection capability for the automated procedure was found to exceed both the defined inspection requirements and the ability of inspection through viewing C-scan images.
【Main Contents】
Chapter 1 Finite Element Method of Lines
Chapter 2 Cracking Analysis of Fracture Mechanics by FEMOL
Chapter 3 3DFinite Bodies Analysis Containing Cracks Using FEMOL
Chapter 4 First Order Reliability Method
Chapter 5 Application to Weep Hole Cracks in C141 Wing
Chapter 6 Automated Ultrasonic Technique to Detect Fatigue Cracks
Chapter 7 Techniques and Instrumentation for Structural Diagnostics
Chapter 8 The Mechanic Behaviors of Rotating Disks
Chapter 9 Large Deformation Analysis of Rotating Disk Using J2 Deformation Theory
Chapter 10 The Burst Strength and Necking Behavior of Rotating Disks
Chapter 11 Large Deformation Analysis for Rotating Disk Using J2 Flow Theory
Chapter 12 Calculated Analysis for Rotating Disk Using ABAQUS and ANSYS
Chapter 13 The Role of Discontinuous Yield of Material (Portevin-Le Chatelier (PLC) Effect, Jerky Flow)
