Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Jerrell A. Nardiello"'
Publikováno v:
International Journal of Fatigue. 32:505-511
Constituent particles in aluminum alloys subjected to fatigue cycling contribute substantially to damage evolution. Yet the amount of constituent particles per mm 2 in highly stressed regions is orders of magnitude larger than the number of particles
Publikováno v:
International Journal of Fatigue. 32:247-255
This paper reports the results of a study of the initial stages of fatigue crack formation in the commercial aluminum alloy 7075-T651. Direct observations were made of the evolution of cracking in a notch under moderately high fatigue loads in a scan
Autor:
Yuanfeng Li, Robert P. Silberstein, Thomas E. Michaels, Greg Welsh, Jerrell A. Nardiello, John M. Papazian, David C. Grundy, Neil Goldfine, Jennifer E. Michaels, Leslie Evans, Campbell Laird, Chris Craven
Publikováno v:
International Journal of Fatigue. 29:1668-1680
Three sensor systems were evaluated for their ability to detect early stage fatigue cracking in open holes. The sensor systems were (1) a Meandering Winding Magnetometer Array sensor system that induces eddy currents to monitor conductivity changes;
Publikováno v:
Communications in Numerical Methods in Engineering. 15:33-42
The non-linear finite element method is employed to investigate the complicated, springback behaviour of doubly curved, titanium, sheet metal parts that are formed with reconfigurable tooling. The results of laboratory experiments confirm the predict
Publikováno v:
Computers & Structures. 66:1-17
Explicit time integration and dynamic finite element formulations are increasingly being used to analyze nonlinear static problems in solid and structural mechanics. This is particularly true in the simulation of sheet metal manufacturing processes.
Autor:
David H. Hoitsma, Elias L. Anagnostou, John S. Madsen, John M. Papazian, Jerrell A. Nardiello, Stephen J. Engel, Northrop Grumman Corp
Publikováno v:
51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 18th AIAA/ASME/AHS Adaptive Structures Conference 12th.
The structural integrity of aircraft has become a critical issue in ensuring the combat readiness of aging aircraft and in the need for more efficient use and maintenance of vital assets. In order to address this need, a science-based approach was ta
Autor:
John M. Papazian, Daniel R. Fridline, Stephen J. Engel, Jerrell A. Nardiello, David H. Hoitsma, John S. Madsen, Elias L. Anagnostou
Publikováno v:
51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 18th AIAA/ASME/AHS Adaptive Structures Conference 12th.
Probabilistic microstructurally-based models for fatigue are being developed as part of a DARPA/Northrop Grumman Structural Integrity Prognosis System (SIPS). An integrated framework has been developed to provide probabilistic fatigue life prognosis
Autor:
R.P. Silberstein, J.B. Whiteside, D. Fridline, E.L.J. Anagnostou, G. Welsh, S. Engel, J. Madsen, D. Hoitsma, J.M. Papazian, Jerrell A. Nardiello
Publikováno v:
2007 IEEE Aerospace Conference.
The Structural Integrity Prognosis System (SIPS) is being designed to provide prompt, informed predictions of the structural viability of individual assets based on tracking of their actual use and modeling of anticipated usage. The prognosis system
Autor:
Jerrell A. Nardiello, Reginald Vachon, Gregory Lee Hovis, Robert D. Fidnarick, William Ranson, Robert J. Christ
Publikováno v:
Volume 13: Processing and Engineering Applications of Novel Materials.
Results are presented for crack initiation detection and crack growth monitoring using DMI SR-1 Strain Gages and DMI SR-2 Reader in two Northrop Grumman aluminum test coupons subjected to cyclic loading. Results demonstrate the utility of the technol
Publikováno v:
Recent Advances in Experimental Mechanics ISBN: 1402006837
Discrete-element reconfigurable tools are attractive for some low-volume metal forming processes. However, the use of these “pin” dies, where the ends of the pins are hemispherically shaped, can cause unacceptable dimpling of the finished parts.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74fc0df73c64c86c1539e294cefa558f
https://doi.org/10.1007/0-306-48410-2_70
https://doi.org/10.1007/0-306-48410-2_70