Widespread Fatigue Damage In Military Aircraft

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Widespread Fatigue Damage In Military Aircraft

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Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting
language : en
Publisher:
Release Date : 1995

Widespread Fatigue Damage In Military Aircraft written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Airframes categories.

Widespread Fatigue Damage In Military Aircraft L Endommagement En Fatigue Des Avions Militaires

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Author :
language : en
Publisher:
Release Date : 1995

Widespread Fatigue Damage In Military Aircraft L Endommagement En Fatigue Des Avions Militaires written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

A structure potentially susceptible to Widespread Fatigue Damage (WFD) is defined by the Industry Committee on Widespread Fatigue Damage, as a structure which has the characteristics of similar features operating at similar stresses where structural capability could be affected by similar cracking. The well-publicized 1988 incident of the Aloha Airlines Boeing 737, which lost a large section of fuselage structure in flight, ushered in the era of research into ageing aircraft. This incident was caused by a collinear series of fatigue cracks which suddenly linked to form a single critical crack, leading to the catastrophic failure. At the time of the Aloha incident, a large number of relatively high-life military aircraft were in service, mainly in the roles of air transport, air-to-air refueling and maritime reconnaissance. Maintaining the structural integrity of these aircraft in prolonged service requires consideration to be given to inspections for detecting possible multiple damage in its various forms: 'Multi-site' damage (MSD) occurs mainly on neighbouring elements (lines of attachment holes, for example) or as a result of a fabrication surface damage (a long, continuous, scratch, for example). Their coalescence can lead to a sudden loss of residual strength. The concept of 'resistance to damage' implies structures which are able to tolerate the presence of cracked elements by ensuring that cracks are slowly propagated and to tolerate the presence of broken elements by providing load path redundancy. On this basis, the strength of the remaining undamaged structure must be sufficient to ensure safety in flight during a specified operating period. The role of Damage Tolerance is to assure structural integrity through in-service directed inspections of critical structures.

Widespread Fatigue Damage In Military Aircraftadvisory Group For Aerospace Research And Development

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Author :
language : en
Publisher:
Release Date : 1995

Widespread Fatigue Damage In Military Aircraftadvisory Group For Aerospace Research And Development written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Challenges And Issues With The Further Aging Of U S Air Force Aircraft

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Author : J. R. Gebman
language : en
Publisher: Rand Corporation
Release Date : 2009

Challenges And Issues With The Further Aging Of U S Air Force Aircraft written by J. R. Gebman and has been published by Rand Corporation this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with History categories.

Over the next 20 years, the further aging of already-old aircraft will introduce challenges and issues for aircraft operators. The technical challenges relate to structures, propulsion, and systems. The institutional challenges include limitations on independent verification of fleet status and future condition and on information needed for engineering analyses including risk assessment, and an overall scarcity of resources.

Corrosion And Widespread Fatigue Damage Of Critical Aircraft Structure

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Author :
language : en
Publisher:
Release Date : 1997

Corrosion And Widespread Fatigue Damage Of Critical Aircraft Structure written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

The effect of corrosion and widespread fatigue damage (WFD) on the structural integrity of USAF aging aircraft could be detrimental to aircraft safety, readiness, and R & M (Reliability & Maintainability) costs. However, with the development and validation of appropriate structural life analysis tools and the supporting data, the effect of corrosion and WFD can be evaluated and therefore managed. But first, the supporting data will need to identify those structural elements which could cause a reduction in aircraft safety, readiness, or R & M when subject to corrosion or fatigue damage. The USAF aircraft fleets selected for consideration included the C/KC-135 Stratotanker, E-8C Joint STARS, C-9A/C Nightingale, C-130 Hercules, and C-5A/B Galaxy. The overall objective is to create a database, which is useful in identifying trends for the occurrence of corrosion and fatigue cracking damage to airframe Principal Structural Elements (PSEs). The database assembled under this effort contains individual records of inspection Reports and Repair Orders which have been obtained from standardized USAF damage and repair recording systems (such as OACIS, AIRS, REMIS, AND AFMC202) and from other USAF programs funded to collect specific airframe damage and repair records. This database is not intended to contain all the data, which might be used in a structural integrity evaluation, but it can be used to identify PSEs, which may need further consideration of their structural integrity capability. The trends developed provide real and repeatable evidence to assist in focusing improvement efforts where the largest gains can be made. The results from this project estimate the extent of corrosion and fatigue damage, which exists in the selected USAF aircraft systems. The Pareto trend format is used often to report the results as database record counts in decreasing order grouped by PSE type, location, and the defect type/severity.

The Characterization Of Widespread Fatigue Damage In Fuselage Structure

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Author : Robert S. Piascik
language : en
Publisher:
Release Date : 1994

The Characterization Of Widespread Fatigue Damage In Fuselage Structure written by Robert S. Piascik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Analysis Of Widespread Fatigue Damage In Aerospace Structures

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Author :
language : en
Publisher:
Release Date : 1999

Analysis Of Widespread Fatigue Damage In Aerospace Structures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

This report summarizes research dealing with analyzing the effects of widespread fatigue damage on aircraft structural integrity. Results are described for determining how cracks nucleate by corrosion, fatigue, or fretting fatigue, and once formed, grow, coalesce and lead to final fracture. The research is conducted in the context of the aging aircraft issue, which focuses on determining procedures for ensuring the continued safety of aircraft that operate beyond their original design lifetimes.

Programme For Life Extension And Widespread Fatigue Damage Evaluation To Ensure Continued Structural Integrity Of Airbus Large Transport Category Airplanes

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Author : Hans Trey
language : en
Publisher:
Release Date : 2003

Programme For Life Extension And Widespread Fatigue Damage Evaluation To Ensure Continued Structural Integrity Of Airbus Large Transport Category Airplanes written by Hans Trey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

The Airworthiness Assurance Working Group (AAWG) has been charted by FAA to enhance and develop rules for continued structural integrity of large transport category airplanes. The subgroup AAWG - RWG(3 (Rule Writing Group) has completed a draft proposal for enhancement of AC91-56 and the introduction of operational rules of aircraft operated under 14 CFR Parts 91, 121, 125, 129 and 135.

Widespread Fatigue Damage Assessment Approach

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Author : Paul W. Tan
language : en
Publisher:
Release Date : 2003

Widespread Fatigue Damage Assessment Approach written by Paul W. Tan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

A methodology to assess the development of widespread fatigue damage (WFD) and its effect on the residual strength of aircraft structure has been developed. The three major components of the methodology are crack initiation, crack growth and linkup, and residual strength. The crack initiation methodology uses experimentally generated equivalent initial flaw size (EIFS) data and an analytical closure model to determine initial flaw sizes and distribution for multiple-site cracking. The crack-tip opening angle (CTOA) and the T* integral, and plastic zone touch (PZT) criteria were used to predict crack growth and linkup.

Fatigue In Aircraft Structures

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Author : United States. Air Force. Air Research and Development Command
language : en
Publisher:
Release Date : 1956

Fatigue In Aircraft Structures written by United States. Air Force. Air Research and Development Command and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with Airplanes categories.