An examination of the double-frustum phenomenon in the mushrooming of cylindrical projectiles upon high-speed impact with a rigid anvil

Balendra, R.; Travis, F.W.

doi:10.1016/0020-7403(71)90037-3

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…This shape has been identified in many studies examining metallic materials. [6][7][8] Balendra et al [8] reasoned that this shape is due to an extremely high radial velocity imparted to the impact face of the specimen initially, but arrested as the deformation wave propagates into the specimen. In contrast, the extended-mushroom shape has a relatively small radial velocity, but has a larger deformation zone that extends further into the specimen.…”

Section: A Transient Deformation-state Observationsmentioning

confidence: 97%

Dynamic Mechanical Behavior Characterization of Epoxy-Cast Al + Fe2O3 Thermite Mixture Composites

Ferranti

Thadhani

2007

Metall Mater Trans A

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The dynamic mechanical behavior characterization of epoxy-cast stoichiometric mixtures of nano-or micron-scale aluminum and hematite (Fe 2 O 3 ) powders is investigated in this work. Experiments conducted on rod-shaped samples, using instrumented reverse Taylor impact tests employing high-speed imaging and velocity interferometry, show that these composites exhibit viscoelastic deformation and brittle fracture behaviors. Upon impact, the samples display significant elastic and plastic deformation during both the loading and unloading stages, as determined from quantitative high-speed camera measurements of the transient deformation states. Approximately 50 pct elastic recovery of total axial strain was observed to occur rapidly (within tens of microseconds) after impact. A one-dimensional elastic-plastic wave propagation analysis was used for estimating the compositeÕs dynamic average yield stress and total plastic strain. The results reveal that the nano-Al + Fe 2 O 3 -containing epoxy composite is most resilient, has the highest strength, and is more capable of absorbing impact energy. The analysis additionally provides detailed information about elastic and plastic wave interactions for discrete times, up to the final state of the material. Calculations and observations through the coupling of high-speed camera images and velocity interferometry (VISAR) measurements show that the elastic recovery coincides with peak axial strain and the interaction of elastic and plastic waves propagating within the rod-shaped specimen. Hence, such an instrumented Taylor test provides a detailed view of the general wave structure within the material upon impact and, at the same time, enables a complete description of the stress-strain response.

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Section: A Transient Deformation-state Observationsmentioning

confidence: 97%

Dynamic Mechanical Behavior Characterization of Epoxy-Cast Al + Fe2O3 Thermite Mixture Composites

Ferranti

Thadhani

2007

Metall Mater Trans A

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“…The aspect ratio [31] can be calculated using the ratio between the rivet penetration depth T and the width w, of the deformed rivet tip, while the volumetric changes were assessed using the volumetric ratio [32], as analytically represented by the changes in volume at the deformed tip of the rivet. The concept, mushrooming effect, was first introduced in ballistics to describe the radial widening of cylindrical projectiles due to high velocity impacts [33][34][35][36][37]. The mushrooming efficiency is introduced to describe the deformation and widening of the rivet tip during FricRiveting.…”

Section: Doe and Statistical Analysis For Evaluating The Joint Mechanmentioning

confidence: 99%

Effect of the friction riveting process parameters on the joint formation and performance of Ti alloy/short-fibre reinforced polyether ether ketone joints

2014

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“…Both showed a typical double-frustum shape at the impact face. [12] However, experiment RT-001 exhibited a different behavior with essentially no radial deformation close to the impact face. This particular specimen fractured approximately 10 mm from the impact face at 31.18 µs following impact.…”

Section: Resultsmentioning

confidence: 95%

Dynamic Characterization of Mock Explosive Material Using Reverse Taylor Impact Experiments

Ferranti

Gagliardi

Cunningham

et al. 2011

Experimental and Applied Mechanics, Volume 6

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The motivation for the current study is to evaluate the dynamic loading response of an inert mock explosive material used to replicate the physical and mechanical properties of LX-17-1 and PBX 9502 insensitive high explosives. The evaluation of dynamic material parameters is needed for predicting the deformation behavior including the onset of failure and intensity of fragmentation resulting from high velocity impact events. These parameters are necessary for developing and validating physically based material constitutive models that will characterize the safety and performance of energetic materials.The preliminary study uses a reverse Taylor impact configuration that was designed to measure the dynamic behavior of the explosive mock up to and including associated fragmentation. A stationary rod-shaped specimen was impacted using a compressed-gas gun by accelerating a rigid steel anvil attached to a sabot. The impact test employed high-speed imaging and velocity interferometry diagnostics for capturing the transient deformation of the sample at discrete times. Once established as a viable experimental technique with mock explosives, future studies will examine the dynamic response of insensitive high explosives and propellants.

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An examination of the double-frustum phenomenon in the mushrooming of cylindrical projectiles upon high-speed impact with a rigid anvil

Cited by 10 publications

References 7 publications

Dynamic Mechanical Behavior Characterization of Epoxy-Cast Al + Fe2O3 Thermite Mixture Composites

Dynamic Mechanical Behavior Characterization of Epoxy-Cast Al + Fe2O3 Thermite Mixture Composites

Effect of the friction riveting process parameters on the joint formation and performance of Ti alloy/short-fibre reinforced polyether ether ketone joints

Dynamic Characterization of Mock Explosive Material Using Reverse Taylor Impact Experiments

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