A soft-recovery plate impact experiment for studying microcracking in ceramics

Raiser, G.; Clifton, R. J.; Ortiz, Michael

doi:10.1016/0167-6636(90)90016-9

Cited by 28 publications

(17 citation statements)

References 26 publications

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“…The main purpose is to use the shock wave as a probe, first to introduce damage (and compaction if the ceramic is porous) in a controlled manner and then to study the resulting damage [185][186][187]. Such damage studies cannot be done by quasi-static high-pressure diamond-anvil compression studies.…”

Section: Brittle Materials: Ceramics and Glassesmentioning

confidence: 99%

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

662

296

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Section: Brittle Materials: Ceramics and Glassesmentioning

confidence: 99%

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

662

296

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“…13 indicate that more damage occurs in Shot Rec01 when compared to the other two experiments. The post-test specimens are observed to be radially cracked in each case, perhaps due to a combination of boundary release waves and tensile stresses resulting from bending/flexure of the specimen during impact [18,20]. More importantly, the recovered granite specimens have the same thickness as prior to impact, indicating the absence of spall failure in the three experiments.…”

Section: Soft-recovery Plate-impact Experimentsmentioning

confidence: 73%

“…State (7) State (1) State (2) State ( conditions such that damage is confined to regions of highly localized stresses and the surrounding regions of lower stress provide resistance to the coalescence and propagation of macrocracks. In order to achieve this, an eight-pointed star-shaped flyer [18,19] is used to subject a central octagonal region of the granite specimen to a plane compressive pulse. A momentum trap (quartz) sitting behind the target specimen is used to prevent reloading of the specimen except of an initial tensile pulse reflected from a pre-set gap between the specimen and the momentum trap.…”

Section: Plate Impact Spall Experimentsmentioning

confidence: 99%

Plate impact experiments to investigate shock-induced inelasticity in Westerly granite

Yuan

Prakash

2013

International Journal of Rock Mechanics and Mining Sciences

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“…Generally, a longitudinal plane pulse (1) induces a mode II crack deformation field; the competition between the inertial resistance and Poisson's effect creates a mode I deformation weak field, and the cylindrical waves (2)-(8) generate a mixed-mode deformation field. In this study, we directly measure variations of the compressive stress pulses using the Mn-Cu gauge technique [Raiser et al 1990;Fowles et al 1970]. To validate the measurements, we compare the amplitudes of stress pulses with the calculated values based on the measured impact speeds V 0 and the elastodynamic relation, σ 0 = ρc l V 0 /2.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Experimental setup. The experiment consists of the following: a pressure-shear gas gun for producing the compressive stress pulses; Mn-Cu stress gauge units for directly measuring the compressive stress-time profiles [Ma 1998]; a soft recovery apparatus [Raiser et al 1990]; two electrical circuits, one for measuring the projectile impact velocities and another for examining the misalignment angles between the impacting planes.…”

Section: Components In the Collision Systemmentioning

confidence: 99%

Untitled

2008

JOMMS

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See inside back cover or http://www.jomms.org for submission guidelines.Regular subscription rate: $500 a year.Subscriptions, requests for back issues, and changes of address should be sent to Mathematical Sciences Publishers, 798 Evans Hall, Department of Mathematics, University of California, Berkeley, CA 94720-3840. ELASTIC CONSTANTS AND THERMAL EXPANSION AVERAGES OF A NONTEXTURED POLYCRYSTAL ROLAND DEWITThis paper gives expressions for the overall average elastic constants and thermal expansion coefficients of a polycrystal in terms of its single crystal components. The polycrystal is assumed to be statistically homogeneous, isotropic, and perfectly disordered. Upper and lower bounds for the averages are easily found by assuming a uniform strain or stress. The upper bound follows from Voigt's assumption that the total strain is uniform within the polycrystal while the lower bound follows from Reuss' original assumption that the stress is uniform. A self-consistent estimate for the averages can be found if it is assumed that the overall response of the polycrystal is the same as the average response of each crystallite. The derivation method is based on Eshelby's theory of inclusions and inhomogeneities. We define an equivalent inclusion, which gives an expression for the strain disturbance of the inhomogeneity when external fields are applied. The equivalent inclusion is then used to represent the crystallites. For the self-consistent model the average response of the grains has to be the same as the overall response of the material, or the average strain disturbance must vanish. The result is an implicit equation for the average polycrystal elastic constants and an explicit equation for the average thermal expansion coefficients. For the particular case of cubic symmetry the results can be reduced to a cubic equation for the selfconsistent shear modulus. For lower symmetry crystals it is best to calculate the self-consistent bulk and shear modulus numerically. IntroductionA polycrystal, whose properties vary in a complicated fashion from point to point over a small microscopic length scale, may appear on average to be uniform or perhaps, more generally, its properties appear to vary smoothly. The determination of such overall properties from the properties and geometrical arrangement of the constituent monocrystal grains is our aim. In the simplest case the polycrystal is assumed to be statistically homogeneous, isotropic, and perfectly disordered. General expressions for averages can then be derived. Many different properties can be averaged, such as dielectric constants, diffusivity, elastic constants, electrical conductivity, magnetic permeability, magnetostriction, piezoelectric constants, thermal conductivity, or thermal expansion. In this paper we treat the elastic constants, which have already received more attention than most other physical properties, and the thermal expansion. Elastic constants are fundamental physical data needed for the characterization of materials. In addition to their fundam...

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A soft-recovery plate impact experiment for studying microcracking in ceramics

Cited by 28 publications

References 26 publications

Review of experimental techniques for high rate deformation and shock studies

Review of experimental techniques for high rate deformation and shock studies

Plate impact experiments to investigate shock-induced inelasticity in Westerly granite

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