Spall strengths of silicon carbides under shock loading

Dandekar, Dattatraya P.; Bartkowski, Peter T.

doi:10.1016/b978-008043896-2/50102-9

“…The only reasonable explanation is that the result is one of material variability. Dandekar had similar results in his study (18,19).…”

Section: Spall Strengthsupporting

confidence: 69%

Effects of Porosity Distribution on the Dynamic Behavior of Two Varieties of SiC

Martin¹

2004

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)December 2004 ARL-TR-3374 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTIn order to understand the microstructural reasons behind variations in ballistic material properties, plate-impact tests were conducted on two sintered silicon carbides with slightly different microstructures. Regular Hexoloy (RH) and Enhanced Hexoloy (EH) were obtained from Saint-Gobain. It was determined that the porosity distribution in EH had fewer large pores leading to an 18% increase in flexural strength over that for RH. Plate-impact experiments were conducted utilizing a VISAR to measure free-surface velocities. Tests were performed on each material to determine the Hugoniot Elastic Limit (HEL) and spall strength. Spall strength was measured as a function of impact stress, and pulse duration. Results show the difference in porosity distribution between EH and RH results in no discernable difference in their HEL values and spall strengths. The spall strengths were independent of pulse width and showed a trend similar to that found in other studies for SiC. Both materials demonstrated finite spall strength above the HEL. iii

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“…Experimentally, spall strength of a ceramic is found to be generally very low, compared to its Hugoniot elastic limit (HEL), and also found to decrease with an increase in shock-induced stress. An exception to this is exhibited by silicon carbide (2), in which spall strength is found to increase initially with an increase in the shock-induced stress before the decrease in spall strength with a further increase in shockinduced stress. The goal of the present work was to examine whether or not the duration and amplitude of shock-wave-induced compression had a significant effect on the spall strength of CER-WC, and whether or not the value of spall strength under simultaneous shock-induced compression shear above the HEL of CER-WC more closely resembled that observed in a titanium alloy, Ti-6Al-4V, reported by Spletzer and Dandekar (3).…”

Section: Introductionmentioning

confidence: 93%

Spall Strength of Tungsten Carbide

Dandekar¹

2004

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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“…The velocity profiles reflect the uniaxial strain loading and unloading behavior of the material (Holmquist et al 1999). Dandekar and Bartkowski (2001) performed spall experiments on the SiC-B and SiC-N materials. They used two experiment designs: one where the particle velocity profile was recorded at a stationary plate poly-methyl-meth-acrylate (PMMA) window interface and one where the free-surface velocity profile of the stationary plate is monitored and the velocity profiles were recorded by a 4-beam velocity interferometer system.…”

Section: Shear Strengthmentioning

confidence: 99%

“…They used two experiment designs: one where the particle velocity profile was recorded at a stationary plate poly-methyl-meth-acrylate (PMMA) window interface and one where the free-surface velocity profile of the stationary plate is monitored and the velocity profiles were recorded by a 4-beam velocity interferometer system. Figure E-4 shows the velocity profiles from the experiments completed by Dandekar and Bartkowski (2001). These velocity profiles were used for the calculation of spall strengths.…”

Section: Shear Strengthmentioning

confidence: 99%

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Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.

Brannon¹,

Lee²,

Bronowski³

2005

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To establish mechanical properties and failure criteria of silicon carbide (SiC-N) ceramics, a series of quasi-static compression tests has been completed using a high-pressure vessel and a unique sample alignment jig. This report summarizes the test methods, set-up, relevant observations, and results from the constitutive experimental efforts. Results from the uniaxial and triaxial compression tests established the failure threshold for the SiC-N ceramics in terms of stress invariants (I 1 and J 2 ) over the range 1246

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Spall strengths of silicon carbides under shock loading

Cited by 23 publications

References 2 publications

Effects of Porosity Distribution on the Dynamic Behavior of Two Varieties of SiC

Effects of Porosity Distribution on the Dynamic Behavior of Two Varieties of SiC

Spall Strength of Tungsten Carbide

Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition.

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