NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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The present project was devoted to the investigation of structure <strong>and</strong> mechanical properties of high- strength aluminum<br />
alloys especially alloys for elevated temperatures. High-strength aluminum alloys can have strengths approximately 50 times<br />
higher than the strength of unalloyed aluminum. Such a strong increase of the alloy strength is a unique case in the science<br />
of metallic materials <strong>and</strong> is a consequence of a tremendous number of theoretical <strong>and</strong> experimental works. For this reason a<br />
further increase of the level of mechanical properties of aluminum alloys is possible using new ideas <strong>and</strong> technologies. Just<br />
this approach was used for all six tasks of the present project. Investigation of mechanical properties was carried out by tension<br />
<strong>and</strong> bending test in various temperature ranges. Structural investigation were performed by X-ray diffraction technique TEM,<br />
SEM, OM, DSC analysis <strong>and</strong> by local X-ray spectral analysis. Correlation of processing chemical composition structure <strong>and</strong><br />
mechanical properties was investigated for obtained high-strength aluminum alloys. The mechanisms of alloy deformation <strong>and</strong><br />
fracture in most strong condition were revealed.<br />
DTIC<br />
Aluminum Alloys; Deformation; High Strength Alloys; High Temperature<br />
20040111563 Ceskoslovenska Akademie Ved, Brno<br />
Creep Behaviour <strong>and</strong> Strength of Magnesium-Based Composites<br />
Sklenicka, V.; Pahutova, M.; Kucharova, K.; Svoboda, M.; Sep. 2003; 27 pp.; In English; Original contains color illustrations<br />
Report No.(s): AD-A425611; No Copyright; Avail: CASI; A03, Hardcopy<br />
No abstract available<br />
Creep Properties; Creep Strength; Magnesium Alloys<br />
20040111564 Oesterreichische Akademie der Wissenschaften, Leoben<br />
Nanostructured Materials Produced by Severe Plastic Deformation<br />
Stuewe, Hien Peter; Sep. 2003; 22 pp.; In English; Original contains color illustrations<br />
Report No.(s): AD-A425612; No Copyright; Avail: CASI; A03, Hardcopy<br />
No abstract available<br />
Metals; Microstructure; Plastic Deformation<br />
20040111643 Colorado State Univ., Fort Collins, CO<br />
Experimental Investigation of Tearing Fracture in Sheets Under Quasi-Static Loading<br />
Roach, Michael L.; Jun. 2004; 79 pp.; In English<br />
Report No.(s): AD-A425746; No Copyright; Avail: CASI; A05, Hardcopy<br />
Although there has been interest in the behavior of metal plates under blast <strong>and</strong> projectile loading for many years,<br />
definitive open-source analysis has only been recently forthcoming. This analysis is most often in the form of scaled<br />
recreations of the dynamic blast event, or ‘live fire’ tests. New developments in methods of recreating blast <strong>and</strong> projectile<br />
induced plate failure using a quasi-static approach provide possible, accurate, alternatives to the cumbersome <strong>and</strong> expensive<br />
live fire test. This research endeavors to develop an accurate, quasi-static method of recreating the penalizing phase of blast<br />
<strong>and</strong> projectile failure in metal sheets, based on a modified trousers- type test. By using the trousers-type fracture test the overall<br />
plastic bending kinematics of the fractured petal is preserved, as well as the mixed mode (mode one <strong>and</strong> mode three) fracture.<br />
Through analytical <strong>and</strong> qualitative analysis, a testing apparatus to generate this trousers-type, plastic bending <strong>and</strong> mixed mode<br />
fracture was designed <strong>and</strong> machined.<br />
DTIC<br />
Fracture Mechanics; Fracturing; Metal Plates; Static Loads; Tearing<br />
20040111708 Colorado School of Mines, Golden, CO<br />
Materials Science Aspects of Weld Corrosion<br />
Olson, D. L.; Lasseigne, A. N.; Marya, M.; Mishra, B.; Castro, G.; Oct. 29, 2003; 12 pp.; In English<br />
Contract(s)/Grant(s): DAAD19-01-1-0375<br />
Report No.(s): AD-A425864; ARO-41923.18-MS; No Copyright; Avail: CASI; A03, Hardcopy<br />
Corrosion is an environmentally assisted damage that professionals face daily, particularly with welded structures. Fusion<br />
welds result from solidification <strong>and</strong> solid- state transformations induced by well-localized thermal cycles. A fusion weld joint<br />
inherently exhibits an irregular surface as well as gradients in chemical composition, microstructure, properties <strong>and</strong> residual<br />
stress, depending upon process parameters <strong>and</strong> part geometry. This article analyzes the roles of surface topography, alloy<br />
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