Investigation on the Effect of Asymmetric Cyclic Loading on Ratcheting Deformation and Bulk Texture Development in HSLA Steel

2022 ◽  
Author(s):  
Pushpendra Kumar Dwivedi ◽  
R. Vinjamuri ◽  
S. K. Sahoo ◽  
Krishna Dutta
Keyword(s):  
Cyclic Loading ◽  
Hsla Steel ◽  
Texture Development

scholarly journals Texture Development of Mg AZ80 after Cyclic Loading at 80% Yield Stress

2011 ◽  
Vol 690 ◽  
pp. 198-201 ◽  
Author(s):  
Heinz Günter Brokmeier ◽  
Miao Jiang ◽  
Emad Maawad ◽  
Bernd Schwebke ◽  
Thomas Lippmann
Keyword(s):  
Cyclic Loading ◽  
Yield Stress ◽  
Texture Component ◽  
Plastic Region ◽  
High Energy ◽  
Texture Development ◽  
Ex Situ ◽  
Direction Parallel ◽  
In Situ Experiments

In situ experiments with a 20kN loading device were carried out at the high energy beam line Harwi-II at Hasylab/Desy-Hamburg/Germany. Main goals were firstly to investigate lattice dependant strain development in the elastic as well as in the plastic region and secondly to perform cyclic loading for strain and texture development. Due to the high energy of about 100keV the synchrotron beam has a high penetration power. Moreover, measurements were comparably fast. The test sample was rectangular extruded Mg AZ80. According to the bar extrusion process, the Mg AZ80 sample has the typical texture with two ideal fibre components, <100> parallel RD and <0001> parallel ND, and an ideal texture component {0001}<100>. Tensile samples were cut with loading direction parallel to transfers direction. The sample diameter of round tensile samples was 4mm. Stress strain curves were carried out ex situ to get an overview of the materials behaviour and in situ to get strain dependant lattice values for at least 6 Mg reflections. The cyclic loading was carried out with a maximum load of about 80% of the yield stress so that one stays always in elastic region. Nevertheless, after 3800 cycles a texture change of the quantitative texture was obtained. Existing texture components are stable but the volume fractions of the three texture components change and additionally a new but weak texture component is growing.

Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

2020 ◽  
Vol 21 (5) ◽  
pp. 505
Author(s):  
Yousef Ghaderi Dehkordi ◽  
Ali Pourkamali Anaraki ◽  
Amir Reza Shahani
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Stress Relaxation ◽  
Stress Amplitude ◽  
Cyclic Plasticity ◽  
Mean Stress ◽  
Effective Parameters ◽  
Perfect Plasticity ◽  
Residual Stress Relaxation ◽  
Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

On The Dynamic Behaviour of Automobile Pulleys Under Cyclic Loading

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Haval Kamal Asker ◽  
Thaker Saleh Dawood
Keyword(s):  
Cyclic Loading ◽  
Dynamic Behaviour

Evaluation of System Effectiveness of Multifunctional Hydrogen Complex at Nuclear Power Plants

2019 ◽  
pp. 24-39
Author(s):  
R. Z. Aminov ◽  
A. N. Bayramov ◽  
M. V. Garievskii
Keyword(s):  
Cyclic Loading ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Frequency Control ◽  
Economic Effect ◽  
Current Frequency ◽  
Main Equipment ◽  
Primary Frequency ◽  
Primary Frequency Control

The paper gives the analysis of the problem of the primary current frequency regulation in the power system, as well as the basic requirements for NPP power units under the conditions of involvement in the primary regulation. According to these requirements, the operation of NPPs is associated with unloading and a corresponding decrease in efficiency. In this regard, the combination of nuclear power plants with a hydrogen complex is shown to eliminate the inefficient discharge mode which allows the steam turbine equipment and equipment of the reactor facility to operate in the basic mode at the nominal power level. In addition, conditions are created for the generation and accumulation of hydrogen and oxygen during the day, as well as additionally during the nighttime failure of the electrical load which allows them to be used to generate peak power.  The purpose of the article is to assess the systemic economic effect as a result of the participation of nuclear power plants in combination with the hydrogen complex in the primary control of the current frequency in the power sys-tem, taking into account the resource costs of the main equipment. In this regard, the paper gives the justification of cyclic loading of the main equipment of the hydrogen complex: metal storage tanks of hydrogen and oxygen, compressor units, hydrogen-oxygen combustion chamber of vapor-hydrogen overheating of the working fluid in the steam turbine cycle of a nuclear power plant. The methodological foundations for evaluating the working life of equipment under cyclic loading with the participation in the primary frequency control by the criterion of the growth rate of a fatigue crack are described. For the equipment of the hydrogen complex, the highest intensity of loading is shown to occur in the hydrogen-oxygen combustion chamber due to high thermal stresses.  The system economic effect is estimated and the effect of wear of the main equipment under cyclic loading is shown. Under the conditions of combining NPP power units with a hydrogen complex, the efficiency of primary reg-ulation is shown to depend significantly on: the cost of equipment subjected to cyclic loading; frequency and intensity of cyclic loading; the ratio of the tariff for peak electricity, and the cost of electricity of nuclear power plants.  Based on the developed methodology for assessing the effectiveness of the participation of nuclear power plants with a hydrogen complex in the primary frequency control, taking into account the damage to the equipment, the use of the hydrogen complex is shown to provide a tangible economic effect compared with the option of unloading nuclear power plants with direct participation in frequency control.

Behavior of HPFRC Connections for Precast Concrete Frames Under Reversed Cyclic Loading

PCI Journal ◽  
1998 ◽  
Vol 43 (6) ◽  
pp. 58-71 ◽  
Author(s):  
Rosa M. Vasconez ◽  
Antoine E. Naaman ◽  
James K. Wight
Keyword(s):  
Cyclic Loading ◽  
Precast Concrete ◽  
Concrete Frames ◽  
Reversed Cyclic Loading ◽  
Reversed Cyclic

Effect of Structural Anisotropy on Deformation Properties of Granite under Cyclic Loading.

1997 ◽  
Vol 46 (9) ◽  
pp. 1029-1034 ◽  
Author(s):  
Harushige KUSUMI ◽  
Yukihisa MINE ◽  
Kazuhiko NISHIDA
Keyword(s):  
Cyclic Loading ◽  
Structural Anisotropy ◽  
Deformation Properties
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