Overload And Underload Effects On The Fatigue Crack Growth Behavior Of The 2024 T3 Aluminum Alloy PDF Download
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Author | : National Aeronautics and Space Adm Nasa |
Publisher | : Independently Published |
Total Pages | : 28 |
Release | : 2018-12-29 |
Genre | : |
ISBN | : 9781792718212 |
Download Overload and Underload Effects on the Fatigue Crack Growth Behavior of the 2024-T3 Aluminum Alloy Book in PDF, ePub and Kindle
Fatigue crack growth tests were conducted on 0.09 inch thick, 3.0 inch wide middle-crack tension specimens cut from sheets of 2024-T3 aluminum alloy. The tests were conducted using a load sequence that consisted of a single block of 2,500 cycles of constant amplitude loading followed by an overload/underload combination. The largest fatigue crack growth life occurred for the tests with the overload stress equal to 2 times the constant amplitude stress and the underload stress equal to the constant amplitude minimum stress. For the tests with compressive underloads, the fatigue crack growth life decreased with increasing compressive underload stress. Dawicke, David S. Langley Research Center NASA-CR-201668, NAS 1.26:201668 NAS1-96014; RTOP 538-02-10-01...
Author | : |
Publisher | : |
Total Pages | : 14 |
Release | : 1997 |
Genre | : |
ISBN | : |
Download Overload and Underload Effects on the Fatigue Crack Growth Behavior of the 2024-T3 Aluminum Alloy Book in PDF, ePub and Kindle
Author | : B. M. Hillberry |
Publisher | : |
Total Pages | : 61 |
Release | : 1975 |
Genre | : Metals |
ISBN | : |
Download The Fatigue Crack Propagation Delay Behavior in 2024-T3 Aluminum Alloy Due to Single Overload/Underload Sequences Book in PDF, ePub and Kindle
The fatigue crack delay behavior due to single overload/underload sequences was studied in center crack panel specimens of 2024-T3 aluminum alloy. The applied loading consisted of constant amplitude loading, an applied overload immediately followed by an underload and then constant amplitude loading at the pre-overload level. The loading parameters investigated are the stress intensity ratios, overload level to maximum fatigue level, underload level to overload level, and minimum fatigue level to overload level. The results show that increasing the amount of underload decreases the number of delay cycles. Also, it is shown that the number of delay cycles is directly related to the minimum growth rate following the overload. The concept of crack closure is extended to include the effects of the overload/underload sequence. From this the maximum value of the opening stress intensity level and the minimum growth rate are determined. This is used to predict the number of delay cycles.
Author | : B. M. Hillberry |
Publisher | : |
Total Pages | : 0 |
Release | : 1975 |
Genre | : Metals |
ISBN | : |
Download The Fatigue Crack Propagation Delay Behavior in 2024-T3 Aluminum Alloy Due to Single Overload/Underload Sequences Book in PDF, ePub and Kindle
The fatigue crack delay behavior due to single overload/underload sequences was studied in center crack panel specimens of 2024-T3 aluminum alloy. The applied loading consisted of constant amplitude loading, an applied overload immediately followed by an underload and then constant amplitude loading at the pre-overload level. The loading parameters investigated are the stress intensity ratios, overload level to maximum fatigue level, underload level to overload level, and minimum fatigue level to overload level. The results show that increasing the amount of underload decreases the number of delay cycles. Also, it is shown that the number of delay cycles is directly related to the minimum growth rate following the overload. The concept of crack closure is extended to include the effects of the overload/underload sequence. From this the maximum value of the opening stress intensity level and the minimum growth rate are determined. This is used to predict the number of delay cycles.
Author | : Ralph Ivan Stephens |
Publisher | : ASTM International |
Total Pages | : 345 |
Release | : 1976 |
Genre | : Alloys |
ISBN | : |
Download Fatigue Crack Growth Under Spectrum Loads Book in PDF, ePub and Kindle
Author | : Joshua Pelleg |
Publisher | : Springer Nature |
Total Pages | : 542 |
Release | : 2021-11-18 |
Genre | : Technology & Engineering |
ISBN | : 303086118X |
Download Cyclic Deformation in Oxides, Carbides and Nitrides Book in PDF, ePub and Kindle
This book presents the fatigue properties of structural materials used for the production of ceramics. It explains the cyclic deformation and how failures occur by fatigue. Dislocations related to fatigue are examined. The way that fatigue induces structural changes in material undergoing cyclic deformation is explained as well. A special chapter considers the importance of environmental effects on fatigue. Surface treatment such as shot pinning, sand blasting and laser treatment are described. The book explains how design should be carried out considering all the major factors leading to reduced fatigue resistance.
Author | : John Edmond Allison |
Publisher | : |
Total Pages | : 136 |
Release | : 1978 |
Genre | : Fracture mechanics |
ISBN | : |
Download The Measurement of Crack Tip Stresses by X-ray Diffraction Book in PDF, ePub and Kindle
To ensure the structural integrity of present day structures subjected to variable amplitude cyclic stress histories, a knowledge of the crack tip stress field is important. In this investigation, crack tip stresses were measured in specimens of 1020 and 1045 steel using a semi-automatic x-ray diffraction technique. Crack tip residual stresses were measured in the unloaded condition and crack tip 'applied' stresses were measured under load. It was observed that, for the alloys tested and within the confines of stress analysis by x-ray diffraction, a dependence exists for the maximum crack tip residual stress on the level of the previous stress intensity factor and also for the maximum crack tip 'applied' stress on the level of the applied stress intensity. This is in sharp contrast to theoretical models of the crack tip stress fields which predict an independence between crack tip stresses and stress intensity levels. Crack tip stresses were observed relative to the fatigue crack growth retardation process. Post overload crack tip stresses were greatly reduced from their pre-overload levels. Limited studies indicated that crack growth, after an overload, had little or no effect on the overload-induced crack tip residual stress distribution. Measurements taken at applied loads, indicated that portions of the material behind the tip of the extended crack were in compression while areas ahead of the extended crack were in tension. These results were considered in light of possible retardation mechanisms.
Author | : |
Publisher | : ASTM International |
Total Pages | : 147 |
Release | : |
Genre | : |
ISBN | : |
Download Methods and Models for Predicting Fatigue Crack Growth Under Random Loading Book in PDF, ePub and Kindle
Author | : Eric F. J. Von Euw |
Publisher | : |
Total Pages | : 86 |
Release | : 1971 |
Genre | : Aluminum alloys |
ISBN | : |
Download Effect of Overload Cycle [S] on Subsequent Fatigue Crack Propagation in 2024-T3 Aluminum Alloy Book in PDF, ePub and Kindle
Author | : J. B. Chang |
Publisher | : ASTM International |
Total Pages | : 150 |
Release | : 1981 |
Genre | : Technology & Engineering |
ISBN | : 9780803107151 |
Download Methods and Models for Predicting Fatigue Crack Growth Under Random Loading Book in PDF, ePub and Kindle