ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Explosive driven rapid fracture in a structural body will be preceded by a compressionprocess, and the compression effects on mechanical properties of the materials are clearly importantto understand shock-induced failure such as spall or fragmentation phenomena. In this study, incidentshock waves in plate specimens of aluminum A2017-T4 and 304 stainless steel are generated by planedetonation waves in the high explosive PETN initiated using wire-row explosion techniques, and thecompressed specimens are successfully recovered without severe damages due to the reflectedexpansion waves with use of momentum trap method. A hydro code, Autodyn-2D is applied todetermine test conditions: thicknesses of explosives, attenuators, specimens and momentum traps andto evaluate experimental results, simulating time-histories of stress waves in the layers of the testassembly. Microhardness distributions in cross-sections, tensile strength, fracture ductility and yieldstress are measured for the recovered specimens, using miniature tensile and compression test piecesmachined from them. They are compared with those of virgin specimens, showing significantincrease of hardness, tensile and yield strength and remarkable reduction of elongation and ductilityfor shocked specimens. The results are taken into consideration for evaluation of experimentalfragmentation energy in cylinder explosion tests
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.566.237.pdf
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