Combined stress waves with phase transition in thin-walled tubes

2014 ◽  
Vol 35 (3) ◽  
pp. 285-296 ◽  
Author(s):  
Qing-zheng Song ◽  
Zhi-ping Tang
Keyword(s):  
Phase Transition ◽  
Stress Waves ◽  
Combined Stress ◽  
Thin Walled

scholarly journals Mechanism Analysis of Liquid Carbon Dioxide Phase Transition for Fracturing Rock Masses

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2909 ◽  
Author(s):  
Feng Gao ◽  
Leihu Tang ◽  
Keping Zhou ◽  
Yanan Zhang ◽  
Bo Ke
Keyword(s):  
Phase Transition ◽  
Carbon Dioxide ◽  
High Pressure ◽  
Initial Stress ◽  
Initial Pressure ◽  
Initial Crack ◽  
Stress Waves ◽  
Mechanism Analysis ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide

The technique of breaking rocks using carbon dioxide phase transition technology is being widely applied in current research. This article combines theoretical and practical methods to analyze the mechanism by which high-pressure gas breaks rock at different stages. Using the observation that liquid carbon dioxide forms a high-pressure jet from release holes at the moment of release, a formula for calculating the initial pressure on the wall in the direction of release was obtained, and the pattern of initial crack formation on the borehole wall under different initial stress conditions was examined. An experiment using carbon dioxide phase transition technology to fracture rock without an initial stress field was conducted. The mechanism of generation and expansion of subsequent cracks under stress waves and high-pressure gas was analyzed, and the formula for calculating crack propagation radius under stress waves was obtained. The results suggested that under the quasi-static action of high-pressure gas, cracks begin to develop when the stress intensity factor KI at the crack tip is equal to or greater than the fracture toughness KIC of the rock.

The Effect of Radial Inertia on Combined Plastic Stress Wave Propagation in Thin-Walled Tubes

1974 ◽  
Vol 41 (3) ◽  
pp. 619-624 ◽  
Author(s):  
C. D. Myers ◽  
M. A. Eisenberg
Keyword(s):  
Wave Propagation ◽  
Stress Wave ◽  
Dynamic Load ◽  
Rise Time ◽  
Method Of Characteristics ◽  
Stress Wave Propagation ◽  
Combined Stress ◽  
Thin Walled ◽  
Radial Inertia ◽  
Hyperbolic Differential Equations

This investigation is concerned with the analysis of combined longitudinal and torsional inelastic stress wave propagation in thin-walled tubes. The effects of radial inertia are included in the development of the governing hyperbolic differential equations which are solved by the method of characteristics. Numerical results are presented for combined stress wave propagation in statically preloaded tubes of material assumed to be described by rate-independent plasticity. The effects of finite rise time of the imposed dynamic load and of radial inertia are analyzed in detail.

scholarly journals ELASTIC-PLASTIC COMBINED STRESS WAVES UNDER CONDITION OF PLANE STRESS

1988 ◽  
Vol 49 (C3) ◽  
pp. C3-601-C3-606
Author(s):  
Y. C. LI ◽  
G. Q. ZHOU ◽  
Z. L. LU
Keyword(s):  
Plane Stress ◽  
Stress Waves ◽  
Combined Stress ◽  
Elastic Plastic

scholarly journals Особенности отклика церия на импульсные воздействия

2018 ◽  
Vol 60 (2) ◽  
pp. 234
Author(s):  
С.А. Атрошенко ◽  
А.Н. Зубарева ◽  
В.А. Морозов ◽  
Г.Г. Савенков ◽  
А.В. Уткин
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Energy Dissipation ◽  
Shock Compression ◽  
Spall Strength ◽  
Stress Waves ◽  
High Current ◽  
High Current Electron Beam ◽  
Current Electron ◽  
High Current Electron

AbstractExperimental studies of cerium at high rates and nanosecond durations of action have been performed. The isomorphic phase transition was studied upon shock compression. The spall strength of cerium has been determined. Cerium demonstrates anomalous compressibility upon dynamic loading. Stress waves dampen under action of a high-current electron beam due to the energy dissipation during fragmentation and twinning.

Combined Stress Tests in Plasticity

1956 ◽  
Vol 23 (1) ◽  
pp. 43-48
Author(s):  
Aris Phillips ◽  
Lloyd Kaechele
Keyword(s):  
Uniaxial Tension ◽  
Plastic Region ◽  
Uniaxial Stress ◽  
Stress Tests ◽  
Combined Stress ◽  
Principal Stresses ◽  
Thin Walled ◽  
Stress Ratios

Abstract A substantial number of combined stress tests on thin-walled tubes of aluminum 2S-O are reported. In most of the tests the tubes have been subjected to combined tension and torsion with variable stress ratios. In the last six tests each tube has first been subjected to uniaxial tension until sufficiently deep in the plastic region and then this state of uniaxial stress has been rotated while the magnitude of the principal stresses remained constant. The purpose of the tests was to get information as to the validity of the incremental theories of plasticity. The results of these tests favor the incremental theories.

EXTENDED INFLATION WITH NONMINIMALLY COUPLED INFLATON FIELD

1992 ◽  
Vol 07 (26) ◽  
pp. 6665-6678
Author(s):  
N. PANCHAPAKESAN ◽  
SHIV K. SETHI
Keyword(s):  
Phase Transition ◽  
Nucleation Rate ◽  
Inflaton Field ◽  
Cosmological Constraints ◽  
Strong Gravity ◽  
Bubble Distribution ◽  
Inflation Model ◽  
Wide Range ◽  
Thin Walled

An extended inflation model, in which the inflaton field is nonminimally coupled to the gravity, is discussed. It is shown that the nucleation rate of bubbles, during a phase transition in the inflaton field, can increase as the transition proceeds for a wide range of parameters of the inflaton potential. The bounce action for three possible cases—the strong gravity regime, the thick-walled Coleman-De Luccia bubbles and the thin-walled bubbles—is evaluated. The resulting bubble distribution for all the cases is shown to be in conformity with cosmological constraints for ω<500.

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