Spall behaviors of high purity copper under sweeping detonation

Yang, Yang; Peng, Zhiqiang; Chen, Xingzhi; Guo, Zhaoliang; Tang, Tiegang; Hu, Haibo; Zhang, Qingming

doi:10.1016/j.msea.2015.11.022

Cited by 24 publications

(8 citation statements)

References 22 publications

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“…In poly-crystalline copper, the study confirmed that grain boundary is the main nucleation point of voids in the primary spallation samples [11,12]. The author [13][14][15][16] also used the high purity copper as the research object, and studied the influence law and mechanism of different loading methods, shape of sample and the "grain boundary effect"(grain boundary type, grain orientation and grain size) on the spallation behavior of high purity metals. A great deal of previous work had focused on the study of spallation of single-phase pure metal, however, multiphase alloys were widely used in modern engineering.…”

Section: Introductionmentioning

confidence: 75%

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Effects of the phase interface on initial spallation damage nucleation and evolution in dual phase titanium alloy

Yang

Jiang

Wang

et al. 2018

Materials Science and Engineering: A

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A B S T R A C TThe Ti-6Al-4V dual phase alloy samples were dynamic loaded by one-stage light gas gun experiment and samples with initial spallation were softly recovered. During the loading experiment, the velocity of free surface particles was measured by photonic doppler velocimetry (PDV). The effect of α/β phase interface on nucleation, growth, and coalescence of dynamic damage in Ti-6Al-4V were investigated by 2-D or 3-D testing techniques, such as optical microscopy(OM), x-ray computer tomography(XRCT), and electron backscattered diffraction(EBSD). The results showed that the majority of voids were nucleated within α phases, rather than on the α/β phase interface as predicted by quasi-static damage theory. Due to the effects of reflection and transmission of shock wave at the phase interface, a tensile pulse would be formed within α phase when the shock wave transmit from α phase with high impedance to β phase with low impedance. When this tensile pulse was large enough, voids would be formed within α phase. The analyses of OM and XRCT indicated that the voids at the beginning of nucleation were nearly spherical, then grew up along the direction of 45°with the shock loading direction, and finally the rod-shaped voids were formed. Besides, the voids were not randomly nucleated within α phase, and the EBSD analysis showed that the voids were mainly nucleated at grain boundary triple points which composed of grains with large difference of Taylor Factor(TF) value within α phase. This is because the difference of plastic deformation capacity of this grains is larger, and it is easier to produce stress concentration. Thus these sites became the prior nucleation position of voids.

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Section: Introductionmentioning

confidence: 75%

“…The author [13][14][15][16] had discussed in detail the influence law and mechanism of grain boundary on the nucleation and growth of voids, and the grain boundary in the ɑ phase also influenced the nucleation and growth of the voids. Fig.…”

Section: Influence Of Grain Boundaries Within ɑ Phase On the Nucleatimentioning

confidence: 99%

Effects of the phase interface on initial spallation damage nucleation and evolution in dual phase titanium alloy

Yang

Jiang

Wang

et al. 2018

Materials Science and Engineering: A

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“…If we relate this result to atomic and molecular bonds breaking, occurring as new surfaces emerge in the main crack area, then it seems rather surprising, since we can`t expect the surge of atomic-binding energy at exposure time substantially higher than time of atomic-molecular system self-oscillations. Still, experiments, for instance [32][33][34], demonstrate, that the fracture process, independently on the material exposure technique, is conditioned not only by spatially localized propagation of the main crack (MC), but also by occurrence of multiple micro-discontinuities at the crack apex area (zone of maximum stresses), which influences the main crack propagation character.…”

Section: Distinctive Features Of Destruction During Shock-wave Loadingmentioning

confidence: 99%

Fracture Energy of Materials Exposed to Pulse Action

Krivosheev¹,

Magazinov²

2016

ujpa

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To study the process of brittle fracture, initiated by a microsecond range pulse action, we applied the magnetic pulse technique of controllable pressure pulse generation with pulse amplitude up to 2 GPa. The threshold energy level has been found, and related to a parameter specific of each material-energy accumulation time. With application of the thermodynamic approach, we develop and demonstrate the destruction criterion that allows us to define this material parameter. Following the results of experimental data and numerical simulation, we show how to describe the destruction process both for samples with crack-type macro defects, and defect-free samples. The study reveals the dependency of the surface energy from the load build-up and material properties when exposed to magnetic pulse action.

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“…For that, the number of studies was limited and the choice of parameters to correlate with damage remains arbitrary (Benzerga et al., 2004; Bieler et al., 2005, 2014; Escobedo et al., 2013; Nicolaou and Semiatin, 2005; Pardoen et al., 1998; Wilkerson, 2017). However, using two-dimensional micrographs of damaged materials (Diard et al., 2002; Fensin et al., 2014; Field and Adams, 1992; Yang et al., 2016) have proven that damage occurs preferably at interfaces taking into account both loading direction and the loading type. Lieberman et al.…”

Section: Introductionmentioning

confidence: 99%

Microstructural features effect on the evolution of cyclic damage for polycrystalline metals using a multiscale approach

Bouchedjra

Amrouche

Belouchrani

2020

International Journal of Damage Mechanics

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In the context of polycrystalline metals, the damage process analysis is generally restricted to surface of a sample containing some hundreds of grains, due to the inherent difficulties microstructural analysis. Determination of the grain size influence, misorientation and neighboring grains effect remains difficult with experimental studies. In this work, the influence of microstructural characteristics of polycrystalline metals on the evolution of the damage process under cyclic loading is investigated. On the basis of the quaternion theory, the orientation of each (crystal) grain is represented by a single angle (theta). The relative misorientation of each grain is set by the ratio of its misorientation over the average value of polycrystalline aggregate. The relative volume of grain is used as a parameter representing the grain size. The damage evolution under cyclic loading is identified using the coupling of the crystal plasticity model with the Continuum Damage Mechanics (CDM) model. The damage evolution and its distribution on polycrystalline aggregate are calculated by means of numerical homogenization over each grain. The heterogeneity distribution and damage evolution for polycrystalline metals have been analyzed. The obtained results show that neighboring grains effects are larger and may change the tendency that larger grains with great misorientation are the most damaged.

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Spall behaviors of high purity copper under sweeping detonation

Cited by 24 publications

References 22 publications

Effects of the phase interface on initial spallation damage nucleation and evolution in dual phase titanium alloy

Effects of the phase interface on initial spallation damage nucleation and evolution in dual phase titanium alloy

Fracture Energy of Materials Exposed to Pulse Action

Microstructural features effect on the evolution of cyclic damage for polycrystalline metals using a multiscale approach

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