Matches in SemOpenAlex for { <https://semopenalex.org/work/W830647076> ?p ?o ?g. }
Showing items 1 to 95 of
95
with 100 items per page.
- W830647076 abstract "Cellular materials are often used as impact/blast attenuators due to their capacity to absorb kinetic energy when compressed to large strains. For such applications, three key material properties are the crushing stress, plateau stress and densification strain. The difficulties associated with obtaining these mechanical properties from dynamic/impact tests are outlined. The results of an experimental investigation of the quasi-static and dynamic mechanical properties of two types of cellular materials are reported.The dynamic tests were carried out using Hopkinson pressure bars. Experimentally determined propagation coefficients are employed to represent both dispersion and attenuation effects as stress waves travel along the bars. Propagation coefficients were determined for 20 mm and 40 mm diameter viscoelastic PMMA pressure bars and for elastic Magnesium pressure bars. The use of the elementary wave theory is shown to give satisfactory results for frequencies of up to approximately 15 kHz, 8 kHz and 30 kHz for the 20 mm and 40 mm diameter PMMA bars and the 23 mm diameter Magnesium bars respectively. The use of low impedance, viscoelastic pressure bars is shown to be preferable for testing low density, low strength materials.The quasi-static and dynamic compressive properties of balsa wood, Rohacell-51WF and Rohacell-110WF foams are investigated along all three principal directions. The dynamic properties were investigated by performing Split Hopkinson Pressure Bar (SHPB) and Direct Impact (DI) tests. In general, the crushing stress, the plateau stress and the densification strain remain constant with increasing strain rate of the SHPB tests. However, a dynamic enhancement of the crushing stress and plateau stress was revealed for balsa wood and Rohacell-51WF. In contrast, the plateau stresses of the Rohacell-110WF specimens are lower for SHPB than quasi-static tests. From the DI tests, it is shown that compaction waves have negligible effect on the stresses during dynamic compaction of along and across the grain balsa wood at impact speeds between approximately 20 ? 100 m/s. Alternatively, the proximal end stresses of both Rohacell-51WF and 110WF foams increase with increasing impact velocity, following the quadratic trend predicted by ?shock theory?. This indicates that compaction waves are important for the case of Rohacell foam, even at low impact velocities." @default.
- W830647076 created "2016-06-24" @default.
- W830647076 creator A5055313470 @default.
- W830647076 date "2010-11-22" @default.
- W830647076 modified "2023-09-24" @default.
- W830647076 title "HOPKINSON BAR TESTING OF CELLULAR MATERIALS" @default.
- W830647076 cites W1520891405 @default.
- W830647076 cites W1964318020 @default.
- W830647076 cites W1964473743 @default.
- W830647076 cites W1965630188 @default.
- W830647076 cites W1983701969 @default.
- W830647076 cites W1990539187 @default.
- W830647076 cites W1990800118 @default.
- W830647076 cites W2005397696 @default.
- W830647076 cites W2012111167 @default.
- W830647076 cites W2012696528 @default.
- W830647076 cites W2016847601 @default.
- W830647076 cites W2039083550 @default.
- W830647076 cites W2050271644 @default.
- W830647076 cites W2050492305 @default.
- W830647076 cites W2076374470 @default.
- W830647076 cites W2142672648 @default.
- W830647076 cites W2157882907 @default.
- W830647076 cites W2508371596 @default.
- W830647076 hasPublicationYear "2010" @default.
- W830647076 type Work @default.
- W830647076 sameAs 830647076 @default.
- W830647076 citedByCount "0" @default.
- W830647076 crossrefType "dissertation" @default.
- W830647076 hasAuthorship W830647076A5055313470 @default.
- W830647076 hasConcept C120665830 @default.
- W830647076 hasConcept C121332964 @default.
- W830647076 hasConcept C127413603 @default.
- W830647076 hasConcept C138885662 @default.
- W830647076 hasConcept C149342994 @default.
- W830647076 hasConcept C150178126 @default.
- W830647076 hasConcept C153294291 @default.
- W830647076 hasConcept C159985019 @default.
- W830647076 hasConcept C180016635 @default.
- W830647076 hasConcept C184652730 @default.
- W830647076 hasConcept C186541917 @default.
- W830647076 hasConcept C188721877 @default.
- W830647076 hasConcept C192562407 @default.
- W830647076 hasConcept C198824145 @default.
- W830647076 hasConcept C21036866 @default.
- W830647076 hasConcept C2776639496 @default.
- W830647076 hasConcept C41895202 @default.
- W830647076 hasConcept C66938386 @default.
- W830647076 hasConcept C77301326 @default.
- W830647076 hasConceptScore W830647076C120665830 @default.
- W830647076 hasConceptScore W830647076C121332964 @default.
- W830647076 hasConceptScore W830647076C127413603 @default.
- W830647076 hasConceptScore W830647076C138885662 @default.
- W830647076 hasConceptScore W830647076C149342994 @default.
- W830647076 hasConceptScore W830647076C150178126 @default.
- W830647076 hasConceptScore W830647076C153294291 @default.
- W830647076 hasConceptScore W830647076C159985019 @default.
- W830647076 hasConceptScore W830647076C180016635 @default.
- W830647076 hasConceptScore W830647076C184652730 @default.
- W830647076 hasConceptScore W830647076C186541917 @default.
- W830647076 hasConceptScore W830647076C188721877 @default.
- W830647076 hasConceptScore W830647076C192562407 @default.
- W830647076 hasConceptScore W830647076C198824145 @default.
- W830647076 hasConceptScore W830647076C21036866 @default.
- W830647076 hasConceptScore W830647076C2776639496 @default.
- W830647076 hasConceptScore W830647076C41895202 @default.
- W830647076 hasConceptScore W830647076C66938386 @default.
- W830647076 hasConceptScore W830647076C77301326 @default.
- W830647076 hasLocation W8306470761 @default.
- W830647076 hasOpenAccess W830647076 @default.
- W830647076 hasPrimaryLocation W8306470761 @default.
- W830647076 hasRelatedWork W1571111404 @default.
- W830647076 hasRelatedWork W1917419658 @default.
- W830647076 hasRelatedWork W1992576494 @default.
- W830647076 hasRelatedWork W1999827800 @default.
- W830647076 hasRelatedWork W2008374332 @default.
- W830647076 hasRelatedWork W2027651490 @default.
- W830647076 hasRelatedWork W2030221399 @default.
- W830647076 hasRelatedWork W2040509542 @default.
- W830647076 hasRelatedWork W2045328738 @default.
- W830647076 hasRelatedWork W2047783112 @default.
- W830647076 hasRelatedWork W2048991096 @default.
- W830647076 hasRelatedWork W2056412610 @default.
- W830647076 hasRelatedWork W2065241282 @default.
- W830647076 hasRelatedWork W2068163457 @default.
- W830647076 hasRelatedWork W2079571415 @default.
- W830647076 hasRelatedWork W2101642875 @default.
- W830647076 hasRelatedWork W2277004331 @default.
- W830647076 hasRelatedWork W2353972279 @default.
- W830647076 hasRelatedWork W2375503883 @default.
- W830647076 hasRelatedWork W2381474902 @default.
- W830647076 isParatext "false" @default.
- W830647076 isRetracted "false" @default.
- W830647076 magId "830647076" @default.
- W830647076 workType "dissertation" @default.