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1991 Vol. 21, No. 1

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DEVELOPMENT AND PROSPECT OF PHYSICAL MECHANICS
1991, 21(1): 1-5. doi: 10.6052/1000-0992-1991-1-J1991-001
Abstract(1819) PDF(745)
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PHYSICAL MECHANICS OF GASES IN THE STUDY OF LASER BEAM INTERACTIONS WITH MATERIALS
1991, 21(1): 6-22. doi: 10.6052/1000-0992-1991-1-J1991-002
Abstract(2289) PDF(897)
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When a material is irradiated by intense laser beam, the ablatior vapor absorbs part or all of laser radiation, and becomes partialy ionized plasma. The propagating plasma is referred to as a laser-supported absorption wave (LSAW). LSAW screens the incident laser beam. At the same time, it emits short-wavelength radiation which is efficiently absorbed by the material surface. From the study of this process, the vapor motion may be 'described by using radiation hydrodynamics. To solve the equation of radiati...
A NEW METHOD IN THE CALCULATION OF EoS AND THE STUDY OF PHASE DIAGRAM OF MATERIALS
1991, 21(1): 23-30. doi: 10.6052/1000-0992-1991-1-J1991-003
Abstract(1684) PDF(788)
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The present paper derives rigorously an equation of state by use of virial theorem at 0°K. No assumption is made concerning the potential energy of system and only the total kinetic energy of system is to be calculated, which signifies a new development in EoS. The new method in the calculation of EoS could be applied to all materials. Considering the difference of the electrons' distribution between TFD model and quantum mechanical statistics, we have introduced quantum corrections to the calculation of th...
DISLOCATION, CRACK AND FRACTURE
1991, 21(1): 31-38. doi: 10.6052/1000-0992-1991-1-J1991-004
Abstract(3137) PDF(1077)
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This article reviews the recent advances in dislocation, crack and fracture. The main contents include:(1) Taking the temperature dependence of yield strength as an example, we discuss the structure sensitivity of mechanical property in order to understand the relationship between the structure of dislocation core and plasticity; (2) Pure elastic fracture is always rare, so th at under the action of stress,a plastic zone(large or small),and interactions between crack and dislocations always exist at the cra...
THE RESEARCH DEVELOPMENT OF THE RADIATION CHARACTERISTIC FOR PLUME OF A VEHICLE
1991, 21(1): 39-52. doi: 10.6052/1000-0992-1991-1-J1991-005
Abstract(1491) PDF(614)
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In this paper the theorctical ealculation of the infrared radiation characteristic for plume of a vehicle is systematically described and the state of arts in the research field both at home and abroad and sonic new results obtained by us arc explained. In particular, it is emphasized that the physical mechanics method, the theoretical basic of which is the atomic and molecular theory, is important to the radiation characteristic research for plume.
1991, 21(1): 52-52. doi: 10.6052/1000-0992-1991-1-J1991-006
Abstract(2156) PDF(617)
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SOME ASPECTS OF HIGH TEMPERATURE REACTING GAS FLOW IN PHYSICAL MECHANICS
1991, 21(1): 53-62. doi: 10.6052/1000-0992-1991-1-J1991-007
Abstract(1657) PDF(702)
Abstract:
The basic conservation equations for noncquilibrium high temperature reacting flow arc derived from the gas kinetic theory. In the nonequilibrium region, the meaning of the fluxes contained in these equations is discussed. The expressions of the transport coefficients based on a microscopic approach are given. The microscopic theories of some physical and chemical kinetic processes arc described, and the difficulties of thcsc theories in the nonequilibrium region are discussed.
PHYSICO-MECHANICAL PROBLEMS OF NANO-METER SIZED MATERIALS
1991, 21(1): 63-69. doi: 10.6052/1000-0992-1991-1-J1991-008
Abstract(1552) PDF(884)
Abstract:
The nano-meter sized materials are polycrystals, in which the size of individual crystallites with clean surfaces is in the order of a few nanometers, typically, 5 to 15 nanometers. They are manufactured by compacting the individual crystallites, under a high pressure of 5 GPa, into the solid structure with gas-like disorder. They display different properties from those materials in the crystalline and glassy state. In this paper the physico-mechanical problems of the nano-meter sized materials, including t...
VARIATIONAL PRINCIPLE OF INSTABILITY OF ATMOSPHERIC MOTIONS
1991, 21(1): 70-82. doi: 10.6052/1000-0992-1991-1-J1991-009
Abstract(1352) PDF(723)
Abstract:
Problems of instability of rotating atmospheric motions are investigated by using nonlinear governing equations and the variational principle. The method suggested in this paper is Universal for obtaining criteria of instability in ail models with all possible basic flows. For example, the model can be barotropic or baroclinic, layered or continuous, quasi-geostrophic or primitive equations! the basic flow can be zonal or nonzonal, steady or unsteady.Although the basic flows show a great deal of variety, th...
ADVANCES IN INTEGRATION METHODS FOR MECHANICS OF NONHOLONOMIC SYSTEMS
1991, 21(1): 83-95. doi: 10.6052/1000-0992-1991-1-J1991-010
Abstract(1497) PDF(801)
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This paper presents some recent developments in integration methods for mechanics of nonholonomic systems,which include the generalizations of classical integrals, inverse problem of Lagrange's mechanics, Hamilton-Jacobi method, field method, invariant measure method and other methods. Finally, this paper puts forward some suggestions for future investigation.
ADVANCES IN STUDIES ON CONTACTS OF ROUGH SURFACES
1991, 21(1): 96-108. doi: 10.6052/1000-0992-1991-1-J1991-011
Abstract(1979) PDF(956)
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No surfaces in engineering are absolutely smooth. The surface topography should be considered for its effects in contacts in some special contact problems. The study of contacts of rough surfaces is a young and interdisciplinary field. It mainly involves contact mechanics, electrical and thermal contact conductances, contact sealing, contact stiffness, contact vibration and noise and human joint contact. It is related to a wide range of disciplines and technologies, such as, solid mechanics, fluid mechanics...
1991, 21(1): 109-127. doi: 10.6052/1000-0992-1991-1-J1991-012
Abstract(1594) PDF(1323)
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1991, 21(1): 128-138. doi: 10.6052/1000-0992-1991-1-J1991-013
Abstract(1066) PDF(1142)
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1991, 21(1): 139-140. doi: 10.6052/1000-0992-1991-1-J1991-014
Abstract(1466) PDF(737)
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1991, 21(1): 141-142. doi: 10.6052/1000-0992-1991-1-J1991-015
Abstract(1228) PDF(639)
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1991, 21(1): 143-144. doi: 10.6052/1000-0992-1991-1-J1991-016
Abstract(1246) PDF(626)
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1991, 21(1): 145-146. doi: 10.6052/1000-0992-1991-1-J1991-017
Abstract(1343) PDF(588)
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1991, 21(1): 147-151. doi: 10.6052/1000-0992-1991-1-J1991-018
Abstract(2704) PDF(926)
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