scholarly journals Bifurcation Analysis of Thin-walled Tube Subjected to Internal Pressure and Axial Tension

1984 ◽  
Vol 27 (227) ◽  
pp. 917-922
Author(s):  
Hiroshi KITAGAWA
Keyword(s):  
Internal Pressure ◽  
Bifurcation Analysis ◽  
Axial Tension ◽  
Thin Walled Tube ◽  
Thin Walled

Tube-Bulging Under Internal Pressure and Axial Force

1973 ◽  
Vol 95 (4) ◽  
pp. 219-223 ◽  
Author(s):  
D. M. Woo
Keyword(s):  
Internal Pressure ◽  
Numerical Solution ◽  
Axial Force ◽  
Compressive Load ◽  
Experimental Results ◽  
Longitudinal Stress ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Tube Bulging

A numerical solution for analysis of the bulging process of a thin-walled tube under internal pressure and axial force is proposed. The solution is applied to a case in which the longitudinal stress resulted from internal pressure and external compressive load is tensile along the whole length of the bulged tube. To verify whether the solution is applicable, theoretical and experimental results on the bulging of copper tubes have been obtained and are compared in this paper.

CONTINUUM DAMAGE MECHANICS ANALYSIS OF THIN-WALLED TUBE UNDER CYCLIC BENDING AND INTERNAL CONSTANT PRESSURE

2013 ◽  
Vol 05 (04) ◽  
pp. 1350038 ◽  
Author(s):  
H. YAZDANI ◽  
A. NAYEBI
Keyword(s):  
Internal Pressure ◽  
Damage Mechanics ◽  
Low Cycle Fatigue ◽  
Kinematic Hardening ◽  
Damage Model ◽  
Continuum Damage Mechanics ◽  
Continuum Damage ◽  
Cyclic Bending ◽  
Thin Walled Tube ◽  
Thin Walled

Ratcheting and fatigue damage of thin-walled tube under cyclic bending and steady internal pressure is studied. Chaboche's nonlinear kinematic hardening model extended by considering the effect of continuum damage mechanics employed to predict ratcheting. Lemaitre damage model [Lemaitre, J. and Desmorat, R. [2005] Engineering Damage Mechanics (Springer-Verlag, Berlin)] which is appropriate for low cyclic loading is used. Also the evolution features of whole-life ratcheting behavior and low cycle fatigue (LCF) damage of the tube are discussed. A simplified method related to the thin-walled tube under bending and internal pressure is used and compared well with experimental results. Bree's interaction diagram with boundaries between shakedown and ratcheting zone is determined. Whole-life ratcheting of thin-walled tube reduces obviously with increase of internal pressure.

scholarly journals Prediction of actual limit stresses in a thin-walled pipe loaded with internal pressure and axial tension

2021 ◽  
pp. 35-41
Author(s):  
Halyna Kozbur ◽  
Oleh Shkodzinsky ◽  
Oleh Yasniy ◽  
Ihor Kozbur ◽  
Roman Hrom'yak
Keyword(s):  
Internal Pressure ◽  
Limit State ◽  
Physical And Mechanical Properties ◽  
Correct Prediction ◽  
Plastic Deformation Zone ◽  
Limit Values ◽  
Axial Tension ◽  
Thin Walled Pipe ◽  
True Stresses ◽  
Thin Walled

If a thin-walled pipe loaded with internal pressure and tension allows the appearance of plastic trains, then the uniform plastic stability loss with the emergence of a local plastic deformation zone is considered the limit state, the corresponding stresses are considered as the limit. Correct prediction of the stress-strain state at the moment of strain localization requires taking into account the actual size of the loaded pipe and the calculation of true stresses. The article proposes the implementation of the method of predicting the limit values of true stresses that appear in the pipe at different ratios of internal pressure and axial tension. The physical and mechanical properties of the material, the type of stress state and the change in the actual dimensions of the loaded element are taken into account.

scholarly journals Numerical prediction of the strength of a thin-walled pipe loaded with internal pressure and axial tension taking into account its actual dimensions

2020 ◽  
Vol 100 (4) ◽  
pp. 11-19
Author(s):  
Halyna Kozbur ◽  
Oleh Shkodzinsky ◽  
Lesia Dmytrotsa
Keyword(s):  
Internal Pressure ◽  
Limit State ◽  
Correct Prediction ◽  
Plastic Deformation Zone ◽  
Limit Values ◽  
Axial Tension ◽  
Thin Walled Pipe ◽  
True Stresses ◽  
Thin Walled ◽  
Actual Geometry

If a thin-walled pipe loaded with internal pressure and tension allows the appearance of plastic strains takes place, then the uniform plastic stability loss with the emergence of a local plastic deformation zone is considered the limit state, the corresponding stresses are considered as the limit ones. Correct prediction of the stress-strain state at the moment of strain localization requires taking into account the actual size of the loaded pipe and the calculation of true stresses. The article proposes the implementation of the method of predicting the limit values of true stresses that appear in the pipe at different ratios of internal pressure and axial tension. The physical and mechanical properties of the material, the type of stress state and the change in the actual dimensions of the loaded pipe are taken into account. For two grades of steels (carbon steel 45 and alloy steel 10MnН2MoV), an increase in the calculated strength threshold is shown with an insignificant additional load of a pipe loaded with pressure and axial tension. Analysis of the results showed that it is possible to establish a balance between the actual geometry of the element and the load, which will solve the problem of finding the optimal ratio of «weight-strength», important for practical applications in aircraft, rocket and mechanical engineering. The proposed method for finding the limiting values of actual stresses makes it possible to calculate a realistic safety factor and make improved engineering solutions at the design and operation stages of structural elements; to increase the efficiency and safety of using pipeline and shell-type saving systems.

scholarly journals Study on Forming Characteristics of Natural Bulging Area of Metal Thin-walled Tube Under Liquid Impact Forming

2021 ◽  
Author(s):  
Xiangwen Fan ◽  
Jianwei Liu ◽  
Zhu Xiao ◽  
Huiping Liang ◽  
Changying Sun ◽  
...  
Keyword(s):  
Internal Pressure ◽  
High Efficiency ◽  
Impact Load ◽  
Thickness Distribution ◽  
Theoretical Research ◽  
Liquid Impact ◽  
Thin Walled Tube ◽  
Forming Characteristics ◽  
Thin Walled ◽  
Hydraulic Bulging

Abstract Liquid Impact Forming (LIF) is a new composite forming technology based on Tube Hydroforming (THF) technology, which changes the volume of mould cavity through impact load and rapidly generates internal pressure to realize tube forming. It does not need external pressure supply source, and it is low cost and high efficiency. In order to study the forming characteristics of the natural bulging area of thin-walled metal tubes under different model side lengths and different model closing velocities, the change of the cavity volume of thin-walled metal tubes under impact hydraulic bulging was firstly analyzed theoretically, and a mathematical model of internal pressure was established. Then the effects of different loading parameters on the internal pressure, bulging height and wall thickness distribution in the natural bulging area of thin-walled metal tube were studied. Finally, through the comparison of finite element simulation analysis and experiment, it was found that the deviation between the experimental results and the numerical simulation was within 5%, which verified the accuracy and reliability of LIF. It also provides a certain theoretical research and application basis for the development of LIF of metal thin-walled tube.

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