Effect of the form of stressed state on the kinetics of damage accumulation and crack resistance of body steel 15Kh2MFA under different conditions. Communication 2. Stagewise failure process for steels KP80 and KP100

1993 ◽  
Vol 25 (5) ◽  
pp. 323-329 ◽  
Author(s):  
N. G. Chausov ◽  
A. A. Lebedev ◽  
L. V. Zaitseva ◽  
A. V. Getmanchuk
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Damage Accumulation ◽  
Failure Process ◽  
Steel 15Kh2mfa ◽  
Kinetics Of

scholarly journals Evaluation of fatigue life of polycrystalline structural alloys

2018 ◽  
Vol 226 ◽  
pp. 03021
Author(s):  
Ivan A. Volkov ◽  
Leonid A. Igumnov ◽  
Aleksandr A. Ipatov
Keyword(s):  
Plastic Deformation ◽  
Damage Accumulation ◽  
Failure Process ◽  
Block Type ◽  
Elastoplastic Behavior ◽  
Evolutionary Equations ◽  
Defining Relations ◽  
Cycle Loading ◽  
Main Effects ◽  
Kinetics Of

A mathematical model describing the processes of elastoplastic deformation and damage accumulation under low-cycle loading has been developed, based on the viewpoint of mechanics of damaged media (MDM). The MDM model consists of three interrelated parts: defining relations describing elastoplastic behavior of the materials, taking into account its dependence on the failure process; evolutionary equations describing the kinetics of damage accumulation; strength criteria of the damaged material. In order to assess the reliability and scope of applicability of the defining relations of mechanics of damaged media, the processes of plastic deformation and damage accumulation in variety of structural steels in low-cycle tests have been numerically analyzed, and numerical results obtained have been compared with the data of full-scale experiments. It is shown that the presented model of mechanics of damaged media adequately describes, both qualitatively and quantitatively, with accuracy, necessary for practical calculations, the main effects of the processes of plastic deformation and damage accumulation in structural alloys under block-type non-stationary non-symmetrical low-cycle loading.

Effect of stressed-state form on failure kinetics and crack resistance in martensitic-aging steel. 1. Study of the failure process stages

1991 ◽  
Vol 23 (8) ◽  
pp. 833-843 ◽  
Author(s):  
A. A. Lebedev ◽  
N. G. Chausov ◽  
L. V. Zaitseva
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Failure Process ◽  
Aging Steel ◽  
State Form

Method for analyzing the kinetics of damage accumulation in the structure of polymer materials under tensile stresses

2021 ◽  
Author(s):  
Tatyana Nizina ◽  
Dmitriy Nizin ◽  
Nadezhda Kanaeva ◽  
Denis Artamonov
Keyword(s):  
Damage Accumulation ◽  
Polymer Materials ◽  
Tensile Stresses ◽  
Kinetics Of

Stressed state of a square sample for crack resistance tests of sheet materials

1982 ◽  
Vol 18 (3) ◽  
pp. 240-244 ◽  
Author(s):  
M. P. Savruk ◽  
S. Ya. Yarema ◽  
P. N. Osiv
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Sheet Materials ◽  
Resistance Tests

scholarly journals EVALUATION OF THE RESOURCE CHARACTERISTICS OF POLYCRYSTALLINE STRUCTURAL ALLOYS UNDER CYCLIC THERMOMECHANICAL LOADING

2021 ◽  
Vol 83 (4) ◽  
pp. 481-504
Author(s):  
I.A, Volkov ◽  
L.A. Igumnov ◽  
D.N. Shishulin ◽  
A.A. Belov
Keyword(s):  
Fatigue Damage ◽  
Damage Accumulation ◽  
Mechanical Characteristics ◽  
Stress Deviator ◽  
Thermomechanical Loading ◽  
Effective Stresses ◽  
Accumulation Of Damage ◽  
Resource Characteristics ◽  
Kinetics Of ◽  
Physical And Mechanical Characteristics

The main physical regularities of complex thermoviscoplastic deformation and accumulation of damage in structural materials (metals and their alloys) under various modes of cyclic combined thermomechanical loading and mathematical models of these processes are considered. A mathematical model of the mechanics of a damaged medium has been developed, which makes it possible to simulate the cyclic viscoelastoplastic behavior and determine the resource characteristics of polycrystalline structural alloys under the combined action of degradation mechanisms that combine material fatigue and creep. The model is based on the joint integration of equations describing the kinetics of the stress-strain state and damage accumulation processes. The final relation to the model is the strength criterion, the fulfillment of which corresponds to the formation of a macrocrack. The plasticity equations are based on the basic principles of the flow theory. To describe the creep process in the stress space, a family of equipotential creep surfaces of the corresponding radius and having a common center is introduced. The relationship between the creep equations and the thermoplasticity equations describing “instantaneous” plastic deformations is carried out at the loading stage through the stress deviator and the corresponding algorithm for determining and at the loading stage by means of certain relationships between “temporary” and “instantaneous” scalar and tensor quantities. At the stage of development of damage scattered throughout the volume, the effect of damage on the physical and mechanical characteristics of the material is observed. This influence can be taken into account by introducing effective stresses. In the general case, stresses, plastic strains, and creep strains are determined by integrating the thermal creep equations by the four-point Runge-Kutta method with correction of the stress deviator and subsequent determination of stresses according to the thermoplasticity equations, taking into account the average creep strain rate at a new time. The relationships that simulate the accumulation of damage are based on the energy approach to determining the resource characteristics. The kinetics of fatigue damage accumulation is based on the introduction of a scalar parameter of damage to a structural material and a unified model form for representing the degradation mechanism under fatigue and creep conditions. The influence of scattered damage on the physical and mechanical characteristics of the material is taken into account by introducing effective stresses. The results of numerical simulation of cyclic thermoplastic deformation and accumulation of fatigue damage in heat-resistant alloys (Haynes188) under combined thermomechanical loading are presented. Particular attention is paid to the issues of modeling the processes of cyclic thermoplastic deformation and the accumulation of fatigue damage for complex deformation processes accompanied by the rotation of the main areas of stress and strain tensors.

Kinetics of damage accumulation in D16сh alloy specimens under static loading

2021 ◽  
pp. 18-26
Author(s):  
M.R. Tyutin ◽  
◽  
L.R. Botvina ◽  
V.P. Levin ◽  
E.N. Beletskii ◽  
...  
Keyword(s):  
Static Loading ◽  
Damage Accumulation ◽  
Kinetics Of

scholarly journals Kinetics of deformation and damage accumulation in concentration zones with nonisothermal low-cycle loading

1985 ◽  
Vol 17 (8) ◽  
pp. 1050-1056
Author(s):  
A. G. Kazantsev ◽  
A. P. Gusenkov ◽  
A. N. Chernykh
Keyword(s):  
Damage Accumulation ◽  
Cycle Loading ◽  
Kinetics Of

Determination of short-term macrostrength and crack resistance of orthotropic composite materials in a complex stressed state

1992 ◽  
Vol 28 (1) ◽  
pp. 43-52
Author(s):  
M. V. Delyavskii ◽  
L. T. Berezhnitskii ◽  
L. I. Onyshko
Keyword(s):  
Composite Materials ◽  
Stressed State ◽  
Crack Resistance ◽  
Complex Stressed State ◽  
Short Term ◽  
Orthotropic Composite
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