Experimental Investigation of the Crack Growth Gage

Experimental Investigation of the Crack Growth Gage
Author :
Publisher :
Total Pages : 104
Release :
ISBN-10 : MINN:31951D03698547T
ISBN-13 :
Rating : 4/5 (7T Downloads)

Synopsis Experimental Investigation of the Crack Growth Gage by : Donald R. Holloway

The objective of this program was to determine the feasibility of the crack growth gage as a more direct method for monitoring potential crack growth damage in fatigue critical areas of F-4 aircraft structure. The major task consisted on mounting crack growth gages on a full-scale F-4C/D fatigue test article and collecting crack growth data from the gages at specified intervals. Two additional tasks were comprised of (1) conducting a gage qualification test program in accordance with MIL-STD-810C (Environmental Test Method) requirements, and (2) determining an appropriate method for collecting data from the gage. Inconsistencies in constant amplitude test results and bonding problems encountered on the F-4C/D full-scale fatigue test article prevented the MIL-STD-810C qualification tests from being started. Results of this investigation indicated that further research and development of the crack growth gage concept is required before the gage can be recommended as a fleetwide tracking device.

Evaluation of the Crack Growth Gage Concept as an Individual Aircraft Tracking Device

Evaluation of the Crack Growth Gage Concept as an Individual Aircraft Tracking Device
Author :
Publisher :
Total Pages : 168
Release :
ISBN-10 : MINN:31951D03698588F
ISBN-13 :
Rating : 4/5 (8F Downloads)

Synopsis Evaluation of the Crack Growth Gage Concept as an Individual Aircraft Tracking Device by : F. J. Giessler

An analytical and experimental program was conducted to evaluate the crack growth gage concept for application as an individual aircraft tracking device. Three gage designs were evaluated. Volume I discusses the evaluation of two versions of a stepped thickness gage and a stepped width gage. Volume II discusses the evaluation of a side-grooved constant thickness gage. An analytical evaluation of the change in transfer function corresponding to gage design parameter changes was performed to determine the configuration of the gages to be tested. Initial spectrum tests were conducted on the first stepped gage design to determine the ranking ability of the gage. Then constant amplitude tests were conducted on the second stepped gage design. A modification of the gage was made to improve spectrum test response. The modified gage was subjected to both constant amplitude testing and spectrum testing. The analytically derived crack growth rates were compared to the test data. In general, the analysis predicted slightly higher growth rates than observed.

Effects of Bonding Temperatures on Fatigue Crack Growth

Effects of Bonding Temperatures on Fatigue Crack Growth
Author :
Publisher :
Total Pages : 68
Release :
ISBN-10 : MINN:31951D03698556S
ISBN-13 :
Rating : 4/5 (6S Downloads)

Synopsis Effects of Bonding Temperatures on Fatigue Crack Growth by : Rodney L. Wilkinson

Changes in the crack growth behavior of 7075-T651 aluminum specimens which has been exposed to temperatures between 150 degrees and 355 degrees F (66 deg and 179 deg C) were evaluated. Specimens were fatigue tested at room temperature under flight-by-flight loading conditions. Results from these tests were then compared with data from the baseline (as received) material. Exposure to 250 deg F (121 deg C) or more produced a definite increase in speciment life, apparently due to a decrease in crack growth rates.

Fracture Mechanics

Fracture Mechanics
Author :
Publisher : ASTM International
Total Pages : 672
Release :
ISBN-10 : 0803107323
ISBN-13 : 9780803107328
Rating : 4/5 (23 Downloads)

Synopsis Fracture Mechanics by : National Symposium on Fracture Mechanics

Technical Abstract Bulletin

Technical Abstract Bulletin
Author :
Publisher :
Total Pages : 356
Release :
ISBN-10 : CORNELL:31924057177770
ISBN-13 :
Rating : 4/5 (70 Downloads)

Synopsis Technical Abstract Bulletin by :

Fracture Mechanics

Fracture Mechanics
Author :
Publisher :
Total Pages : 672
Release :
ISBN-10 : UOM:39015000511090
ISBN-13 :
Rating : 4/5 (90 Downloads)

Synopsis Fracture Mechanics by :