Scientific Meeting ?Strength of Materials and Structural Elements under Complex Stress Conditions?

1978 ◽  
Vol 10 (10) ◽  
pp. 1231-1232
Author(s):  
A. A. Lebedev ◽  
V. I. Koval'chuk
Keyword(s):  
Complex Stress ◽  
Scientific Meeting ◽  
Stress Conditions ◽  
Structural Elements ◽  
Strength Of Materials

scholarly journals INVESTIGATION OF MULTI-CYCLE FATIGUE OF EQUIPMENT AND MACHINERY ELEMENTS UNDER COMPLEX STRESS CONDITIONS AND NON- STATIONARY LOADING

2020 ◽  
Vol 3 (77) ◽  
pp. 11-17
Author(s):  
S. J. JASEN ◽  
◽  
D. K. JAKIYEV ◽  
S. S. ZHUNISBEKOV ◽  
◽  
...  
Keyword(s):  
Experimental Data ◽  
Fatigue Life ◽  
Cyclic Stress ◽  
Complex Stress ◽  
Stress Conditions ◽  
Energy Concentration ◽  
Structural Elements ◽  
Cycle Fatigue ◽  
Stationary Loading ◽  
Comparison Of The Results

A computational and experimental method for estimating the fatigue life of structural elements of machines operating under complex cyclic stress conditions and non-stationary loading is considered. Comparison of the results of the calculations and experimental data indicated the effectiveness of the kinetic equation of multi-cycle fatigue damage based on the energy concentration of fatigue failure.

Failure behavior of multi-state system considering functional and physical isolation effects

2021 ◽  
pp. 1748006X2110418
Author(s):  
Ying Chen ◽  
Ze Wang ◽  
Yanfang Wang ◽  
Rui Kang
Keyword(s):  
Transition Probabilities ◽  
Functional Dependence ◽  
Great Difficulty ◽  
Complex Stress ◽  
State System ◽  
Stress Conditions ◽  
State Transitions ◽  
Failure Behavior ◽  
Physical Isolation ◽  
Isolation Effects

The multi-state system (MSS) is a system that may exhibit multiple states or performance levels. Most existing studies assumed that the transition probabilities from states to states are known. However, in practical engineering, the complex stress conditions lead to great difficulty of collecting the statistical data of state transitions. In this paper, based on physics-of-failure theory, we consider different levels of damages caused by failure mechanisms (FMs) are the main reasons to components’ multiple states. Besides, the physical isolation (PI) effect on degradations of FMs is also studied, which is neglected in the existing studies about the MSS with functional dependence groups. Decision-diagram based methods are used for modeling the failure behavior of the MSS. An automatic collision avoidance system is analyzed for illustrating the proposed modeling and analyzing methods. The results show that comparing to the results without the consideration of PI effect, the probabilities of different states with PI effect of multi-state components and system may decrease or increase, which depends on the actual PI effects to the stress conditions.

scholarly journals The Role of Structural Elements of the 5'-Terminal Region of p53 mRNA in Translation under Stress Conditions Assayed by the Antisense Oligonucleotide Approach

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0141676 ◽  
Author(s):  
Agata Swiatkowska ◽  
Paulina Zydowicz ◽  
Agnieszka Gorska ◽  
Julia Suchacka ◽  
Mariola Dutkiewicz ◽  
...  
Keyword(s):  
Antisense Oligonucleotide ◽  
Terminal Region ◽  
Stress Conditions ◽  
Structural Elements ◽  
P53 Mrna

scholarly journals Influence of stresses on deformation process under the irradiation creep and swelling

2021 ◽  
pp. 23-28
Author(s):  
Dmytro Breslavsky
Keyword(s):  
Numerical Modelling ◽  
Strain State ◽  
Strain Tensor ◽  
Complex Stress ◽  
Complex Stress State ◽  
Structural Elements ◽  
Stress Strain ◽  
Radiation Creep ◽  
Stress Strain State ◽  
Radiation Swelling

Approaches for describing the deformation of structural elements made from the material, in which radiation creep and swelling strains develop simultaneously, are discussed. The technique for description of irradiation swelling strains, which is used for calculational analysis of stress-strain state arising in structural elements under the joint action of irradiation and thermal-stress fields, is regarded. A complete system of equations of the boundary –initial value problem is presented, in which elastic and thermal strains, strains of radiation creep and swelling are taken into account. Numerical modelling was carried out using the specialized software FEM Creep, in which the boundary value problem is solved by the Finite Element Method, and the initial one is integrated in time by the difference predictor-corrector method. Two forms are given for the equation of state describing the radiation swelling strains: first is for the components of the strain tensor as well as second is prepared for their rates. The hypothesis about the linear correspondence of the received radiation dose and the deformation time, during which radiation swelling strains develop, are analyzed. A number of questions that require answers when using equations with a complex stress state in which the radiation swelling strains are directly depend on stresses, are discussed. Based on the processing of experimental data on the swelling of tubes made of steel 316Ti in the temperature range of 450-460 °С, a form of the equation for the radiation swelling strain rate is proposed, and the constants included in it are determined. Using the example of numerical modelling of the deformation of tubes were made of steel 316Ti and loaded by inner pressure, the applicability of the classical approach for the analysis of the stress-strain state in the presence of radiation swelling strains is shown.

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