Author: Robert S. PiascikPublisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 34
Book Description
The Growth of Small Corrosion Fatigue Cracks in Alloy 2024
Author: Robert S. PiascikPublisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 34
Book Description
The Growth of Small Corrosion Fatigue Cracks in Alloy 2024
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722867089
Category :
Languages : en
Pages : 32
Book Description
The corrosion fatigue crack growth characteristics of small surface and corner cracks in aluminum alloy 2024 is established. The damaging effect of salt water on the early stages of small crack growth is characterized by crack initiation at constituent particle pits, intergranular microcracking for a less than 100 micrometers, and transgranular small crack growth for a micrometer. In aqueous 1 percent NaCl and at a constant anodic potential of -700 mV(sub SCE), small cracks exhibit a factor of three increase in fatigue crack growth rates compared to laboratory air. Small cracks exhibit accelerated corrosion fatigue crack growth rates at low levels of delta-K (less than 1 MPa square root of m) below long crack delta-K (sub th). When exposed to Paris regime levels of crack tip stress intensity, small corrosion fatigue cracks exhibit growth rates similar to that observed for long cracks. Results suggest that crack closure effects influence the corrosion fatigue crack growth rates of small cracks (a less than or equal to 100 micrometers). This is evidenced by similar small and long crack growth behavior at various levels of R. Contrary to the corrosion fatigue characteristics of small cracks in high strength steels, no pronounced chemical crack length effect is observed for Al by 2024 exposed to salt water. Piascik, Robert S. and Willard, Scott A. Langley Research Center RTOP 538-02-10-01...
The growth of small corrosion fatigue cracks in alloy 7075
Author: Robert S. PiascikFAA/NASA International Symposium on Advanced Structural Integrity Methods for Airframe Durability and Damage Tolerance
Author: Charles E. HarrisPublisher:
ISBN:
Category : Airframes
Languages : en
Pages : 520
Book Description
Effects of the Environment on the Initiation of Crack Growth
Author: William Alan Van der SluysPublisher: ASTM International
ISBN: 0803124082
Category : Metals
Languages : en
Pages : 304
Book Description
Corrosion Fatigue Initiation and Short Crack Growth in an Aluminum Alloy
Author: Yen-How HuangPublisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 332
Book Description
Applied Mechanics Reviews
Author: A Practical Engineering Approach to Predicting Fatigue Crack Growth in Riveted Lap Joints
Author: C. E. HarrisPublisher:
ISBN:
Category : Airframes
Languages : en
Pages : 28
Book Description
An extensive experimental database has been assembled from very detailed teardown examinations of fatigue cracks found in rivet holes of fuselage structural components. Based on this experimental database, a comprehensive analysis methodology was developed to predict the onset of widespread fatigue damage in lap joints of fuselage structure. Several computer codes were developed with specialized capabilities to conduct the various analyses that make up the comprehensive methodology. Over the past several years, the authors have interrogated various aspects of the analysis methods to determine the degree of computational rigor required to produce numerical predictions with acceptable engineering accuracy. This study led to the formulation of a practical engineering approach to predicting fatigue crack growth in riveted lap joints. This paper describes the practical engineering approach and compares predictions with the results from several experimental studies.
Scientific and Technical Aerospace Reports
Author: Fatigue of Materials and Structures
Author: Claude BathiasPublisher: John Wiley & Sons
ISBN: 1118623371
Category : Technology & Engineering
Languages : en
Pages : 415
Book Description
The design of mechanical structures with improved and predictable durability cannot be achieved without a thorough understanding of the mechanisms of fatigue damage and more specifically the relationships between the microstructure of materials and their fatigue properties. Written by leading experts in the field, this book (which is complementary to Fatigue of Materials and Structures: Application to Damage and Design, also edited by Claude Bathias and André Pineau), provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, polymers and composites. Each chapter is devoted to one of the major classes of materials or to different types of fatigue damage, thereby providing overall coverage of the field. The book deals with crack initiation, crack growth, low-cycle fatigue, gigacycle fatigue, shorts cracks, fatigue micromechanisms and the local approach to fatigue damage, corrosion fatigue, environmental effects and variable amplitude loadings, and will be an important and much used reference for students, practicing engineers and researchers studying fracture and fatigue in numerous areas of mechanical, structural, civil, design, nuclear, and aerospace engineering as well as materials science.