NDLI: Explosively Driven Fragmentation Experiments for Continuum Damage Modeling

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Lambert, David E. Osborn, John Hopson, Michael V.
Copyright Year	2012
Abstract	The explosively loaded right-circular tube geometry is used as the basis for dynamic fracture and fragmentation modeling. Details of the cylinder configuration are investigated to prescribe controlled loading conditions of uniaxial stress and plane strain. Earlier works by Goto [2008, “Investigation of the Fracture and Fragmentation of Explosively Driven Rings and Cylinders,” Int. J. Impact Eng. 35 (12), pp. 1547–1556] had used thin-walled tubes to provide plane strain loading and shorter “rings” to establish uniaxial stress conditions. This paper extends on that work to look at alternative cylinder dimensions and metals of interest. A tungsten alloy, Aero-224, and a high strength steel, Eglin Steel (ES-1), are the subject metals. Transient continuum-mechanics simulations evaluated whether the stress triaxiality conditions were being met as design parameters of cylinder material, cylinder wall-thickness, cylinder length, and initiation configuration were varied. Design analysis shows that the thin cylinders of ES-1 steel do establish the desired plane strain conditions as it expands to failure. Ultra-high speed photography experiments verify the time of fracture and correlate casewall expansion and velocity measurements. Synchronization of the code and diagnostics measurements is presented as a valuable analysis method. On the other hand, rings (i.e., uniaxial stress) of the Aero-224 tungsten alloy were failing just short of uniaxial stress approximating conditions. Analysis of the Aero-224 rings indicated it must be capable of achieving at least a 25% strain to failure in order to have the triaxiality condition satisfied. Strain to failure measurements directly from recovered fragments were less than 14%. Nevertheless, a Weibull distribution was fit to the empirical data set and used to drive a statistically compensated fracture model. Results and discussion of the failure strain distribution and the ability for continuum codes to adequately conduct such simulations are presented.
Starting Page	031209
Ending Page	031215
Page Count	7
File Format	PDF
ISSN	00949930
e-ISSN	15288978
Journal	Journal of Pressure Vessel Technology
Volume Number	134
Issue Number	3
DOI	10.1115/1.4006119
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2012-05-18
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cylinders Design Dimensions Engineering simulation Explosions Failure Fracture (Process) Modeling Plane strain Steel Stress Wall thickness
Content Type	Text
Resource Type	Article
Subject	Safety, Risk, Reliability and Quality Mechanical Engineering Mechanics of Materials

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