Scale effects in fracture

Ivanov, A. G.; Минеев, В. П.

doi:10.1007/bf00740593

Cited by 21 publications

(1 citation statement)

References 25 publications

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“…Results of experiments [1][2][3][4] with various-scale, geometrically similar, spherical and cylindrical shells of structural steels under internal explosive loading (with the cavity filled with water and air) unambiguously indicate the possibility of the occurrence of a strong scale effect of an energetic nature (SEEN) [5], which decreases the ultimate specific load-bearing capacity ξ [the ratio of the ultimate mass of the high explosive (HE) whose explosion results in no shell failure to the shell mass] and deformability with a geometrically similar increase in the shell dimensions. For steel structures, the SEEN becomes especially pronounced in going from cylindrical to spherical shell [1,2] because of a decrease in shell plasticity and deformability with an increase in the stress biaxiality and specific elastic-strain energy.…”

Section: Introductionmentioning

confidence: 98%

Criterion for Selecting Composite Materials for Explosion Containment Structures (Review)

Федоренко

Syrunin

Ivanov

2005

Combust Explos Shock Waves

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Experimental data on the dynamic response and strength of simple shells of fiber composites are used to justify the choice of these materials for the load-bearing shells of blast-proof structures. It is shown that in such structures composites are preferred to homogeneous metal alloys (structural steels) to eliminate strong scale effects of an energetic nature. A criterion for selecting fibers is proposed and justified experimentally, and reinforcement patterns are determined to obtain optimal (in the strength-mass ratio) compositions for the load-bearing shells of blast-proof containers and chambers.

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Section: Introductionmentioning

confidence: 98%

Criterion for Selecting Composite Materials for Explosion Containment Structures (Review)

Федоренко

Syrunin

Ivanov

2005

Combust Explos Shock Waves

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Thermite Type Reactions of Different Metals with Iron‐Oxide and the Influence of Pressure

Weiser

Roth

Raab

et al. 2010

Propellants Explo Pyrotec

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Thermite type reactions are usually used when high quantities of heat should safely be produced with low gas release. Stoichiometric samples of aluminium, magnesium and titanium particles in mm-scale were mixed with iron(III) oxide and filled into small test tubes maintaining a constant bulk density. The metals were chosen regarding their heat release, melting and boiling point, the latter also important for the metal oxides. The samples were burnt in a window bomb pressurised from 0.1 to 13 MPa with nitrogen. The reaction was observed using a colour high-speed camera equipped with a macro object lens and different fast scanning emission spectrometers in UV/Vis and NIR to determine burning velocity, emitting species and reaction temperatures. The residues were analysed using scanning electron microscopy (SEM) including energy dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). The samples burnt in a reproducible way at a linear regression rate. A strong influence of pressure on the burning velocity and reaction zone temperatures was observed. The burning velocity varied by a factor of 3 forming a maximum at a certain pressure that is characteristic to the type of metal. In correlation, temperatures varied by several hundred Kelvin. Results were discussed regarding the decomposition, melting and boiling behaviour also including thermodynamic equilibrium calculations resulting in a qualitative two-step model of interacting and reacting droplets.

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Dynamic Fracture and Fragmentation

Grady

Kipp

1993

High-Pressure Shock Compression of Solids

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Scale effects in fracture

Cited by 21 publications

References 25 publications

Criterion for Selecting Composite Materials for Explosion Containment Structures (Review)

Criterion for Selecting Composite Materials for Explosion Containment Structures (Review)

Thermite Type Reactions of Different Metals with Iron‐Oxide and the Influence of Pressure

Dynamic Fracture and Fragmentation

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