scholarly journals The Effect of Internal Pressure on Radial Strain of Steel Pipe Subjected to Monotonic and Cyclic Loading

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2849 ◽  
Author(s):  
Costel Pleșcan ◽  
Mariana D. Stanciu ◽  
Matyas Szasz
Keyword(s):  
Finite Element Method ◽  
Internal Pressure ◽  
Failure Modes ◽  
Radial Strain ◽  
The Finite Element Method ◽  
Steel Pipes ◽  
Environmental Disasters ◽  
Plastic Domain ◽  
Stress States ◽  
Hardening Of Materials

Steel pipes in different engineering applications may fail, leading to numerous environmental disasters. During loading, certain mechanical and chemical phenomena develop inside the pipes and cause them to burst. In this study, the influence of internal pressure on the elastic and plastic behaviour of E355 steel pipes was investigated on small specimens with different wall thicknesses. First, the failure modes of pipes subjected to monotonic loading were assessed, and then the behaviour of specimens subjected to cyclic internal pressure was analysed in terms of variation of radial strain. The strain and stress states of pipes were analysed using the finite element method. The results revealed that the hardening of materials inside the pipes increases the risk of cracking and bursting because of elasticity limits being exceeded, causing entry into the plastic domain. The transition of mechanical behaviour can be observed in the microstructure of steel in cracked areas from the inside to the outside of the pipe.

The Accepting of Pipe Bends With Ovality and Thinning Using Finite Element Method

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
AR. Veerappan ◽  
S. Shanmugam ◽  
S. Soundrapandian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Cross Sections ◽  
Pressure Ratio ◽  
Empirical Relationship ◽  
The Finite Element Method ◽  
Element Method

Thinning and ovality are commonly observed irregularities in pipe bends, which induce higher stress than perfectly circular cross sections. In this work, the stresses introduced in pipe bends with different ovalities and thinning for a particular internal pressure are calculated using the finite element method. The constant allowable pressure ratio for different ovalities and thinning is presented at different bend radii. The allowable pressure ratio increases, attains a maximum, and then decreases as the values of ovality and thinning are increased. An empirical relationship to determine the allowable pressure in terms of bend ratio, pipe ratio, percent thinning, and percent ovality is presented. The pipe ratio has a strong effect on the allowable pressure.

Investigation of API 8 Round Casing Connection Performance—Part I: Introduction and Method of Analysis

1984 ◽  
Vol 106 (1) ◽  
pp. 130-136 ◽  
Author(s):  
W. T. Asbill ◽  
P. D. Pattillo ◽  
W. M. Rogers
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Mechanical Behavior ◽  
Experimental Analysis ◽  
Strain Gages ◽  
The Finite Element Method ◽  
Strength Of Materials ◽  
Methods Of Analysis ◽  
Element Method

The purpose of this investigation was to gain a better understanding into the mechanical behavior of the API 8 Round casing connection, when subjected to service loads of assembly interference, tension and internal pressure. The connection must provide both structural and sealing functions and these functions were evaluated by several methods. Part I discusses the methods of analysis, which include hand calculations using strength of materials, finite element method via unthreaded and threaded models, and experimental analysis using strain gages. Comparisons of all three methods are made for stresses and show that the finite element method accurately models connection behavior.

Finite Element Method to Evaluate Effects of Hip Implant Geometry on Bone Cement Stress Distribution

2007 ◽  
Author(s):  
Yang W. Son ◽  
Douglas H. Wentz ◽  
Danny L. Levine ◽  
Todd S. Johnson
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Failure Modes ◽  
Rotational Stability ◽  
The Finite Element Method ◽  
Hip Prostheses ◽  
Hip Implant ◽  
Cement Interface ◽  
Element Method

Loosening of cemented hip prostheses has been reported on occasion. Although a few laboratory experiments have replicated clinical failure modes, the methods appear to be very complicated and time consuming. In this analysis, the Finite Element Method was utilized to evaluate the stress distribution in a cement layer. Two distinct hip implant designs with and without grooves in the anterior/posterior surfaces were investigated. The results indicate that the features of the multiple grooves in these cemented hip implants may improve the rotational stability and reduce the cement stress at the implant-cement interface.

Stress Analysis of Stainless Steel Elbow and Tee Fittings Subjected to Internal Pressure and External Loads

1999 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Tetsuya Furuya ◽  
Tadahiro Murakami ◽  
Yasuyuki Kagaya
Keyword(s):  
Internal Pressure ◽  
Wall Thickness ◽  
Bending Moment ◽  
Maximum Pressure ◽  
Screw Thread ◽  
The Finite Element Method ◽  
Internal Working ◽  
Stress States ◽  
Screw Threads ◽  
External Loads

Abstract In this paper, mechanical behaviors of the Elbow and Tee fittings connected to pipes by screw threads under internal pressure, external tensile loads and bending moment are analyzed using the Finite Element Method (FEM). FEM code employed is MARC. The maximum Mises stress of the Elbow and Tee fittings are obtained when the wall thickness is changed while the internal working maximum pressure is held constant at 20bar. The elasto-plastic stress states of screw threads the fittings and the pipes are obtained under internal pressure and external loads. Under the assumptions that nodal points are released when the strain of the elements reaches the rupture strain of the fitting’s material, the load when the rupture occurs at the screw thread is analyzed. The safety factor for the wall thickness of the Elbow and Tee fittings used in the experiment is found to be about 5. The results indicate deduced that the dimensions of Elbow and Tee fittings can be reduced. The strength of the fittings under internal pressure and external loads is obtained. It is found that the stress concentrates at the first root of male thread and expected that a fracture initiates at the first root. The strain of the Elbow and Tee fittings subjected to internal pressure were measured by using strain gauges. The numerical results are in a fairly good agreement with the experimental results.

FEM-Based Comparison of Mandrel Wear Resulting from Elongation of Pipes Manufactured from Various Materials on a Two-Roll Screw Rolling Mill

2022 ◽  
Vol 1049 ◽  
pp. 96-101
Author(s):  
Quang Nguyen ◽  
Alexander Sergeevich Aleshchenko
Keyword(s):  
Finite Element Method ◽  
Stainless Steel ◽  
Rolling Mill ◽  
The Finite Element Method ◽  
Screw Rolling ◽  
Pipe Rolling ◽  
Steel Pipes ◽  
Stainless Steel Pipe ◽  
Materials Used ◽  
Screw Rolling Mill

The present article discusses the cylindrical mandrel wear change during rolling using MISIS - 130 D mill depending on the type of rolled billets materials used. The research on the mandrel wear of the screw rolling mill during pipes elongation was carried out using the finite element method (FEM). The results of the wear modeling showed that the depth of the metal removed on the mandrel surface during stainless steel pipes elongation was higher as compared to alloyed and carbon steel pipes. The significant wear of the mandrel during stainless steel pipe rolling can be explained by the rise in the applied metal force resulting from the introduction of alloying components such as chromium and nickel into rolled billets materials. Consequently, the obtained modeling results can allow predicting the service life of working tools.

scholarly journals Numerical And Experimental Study Of Producing Flanges On Hollow Parts By Extrusion With A Movable Sleeve

2015 ◽  
Vol 60 (3) ◽  
pp. 1917-1922 ◽  
Author(s):  
A. Gontarz ◽  
G. Winiarski
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Failure Modes ◽  
Experimental Results ◽  
New Method ◽  
Special Device ◽  
The Finite Element Method ◽  
Forming Process ◽  
Forging Press ◽  
Good Agreement

Abstract The paper presents the numerical and experimental results of a new method for producing flanges on hollow parts. With this new method, the flange is extruded by a movable sleeve. This innovative technique is modelled numerically by the finite element method. The effect of workpiece and finished product geometries on the forming process is investigated and failure modes are identfied. The numerical reults are then verified in experiments. The tests are conducted using a three-slide forging press equipped with a special device. The numerical and experimental results show a good agreement, which proves that the developed method is correct.

Numerical Analysis of Stress States for Graphitic Cast Iron Structures

2014 ◽  
Vol 611 ◽  
pp. 252-255 ◽  
Author(s):  
Jan Vavro ◽  
Ján Vavro ◽  
Petra Kováčiková ◽  
Peter Kopas ◽  
Marián Handrik ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cast Iron ◽  
Numerical Analysis ◽  
Ductile Cast Iron ◽  
Material Structure ◽  
The Finite Element Method ◽  
The Matrix ◽  
Stress States ◽  
Element Method

The presented work is focused on the analysis of stress distribution around the graphitic particles in microstructure of ductile cast iron with the spheroidal shape of graphite (SGCI) and grey cast iron with the lamellar shape of graphite (LGCI). The analysis was made with help of the finite element method in the software system ADINA.v.8.6.2. On the basis of the real structure, the finite element method was used for creation of the model which was subsequently used for calculation of the distribution of stress in the material structure. The input data for numerical analysis were obtained on the basis of evaluation of the structure with help of image analysis. The numerical analysis proved that graphitic particles in the matrix cause the accumulation of stress and the distribution of given stress depends on the shape of the graphitic particles.

scholarly journals Numerical and Experimental Study of Producing Flanges on Hollow Parts by Extrusion with a Movable Sleeve / Badania Teoretyczno-Doświadczalne Procesu Wyciskania Z Zastosowaniem Ruchomej Tulei Kołnierza We Wsadach Drążonych

2015 ◽  
Vol 60 (4) ◽  
pp. 2733-2738
Author(s):  
A. Gontarz ◽  
G. Winiarski
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Failure Modes ◽  
Experimental Results ◽  
New Method ◽  
Special Device ◽  
The Finite Element Method ◽  
Forming Process ◽  
Forging Press ◽  
Good Agreement

The paper presents the numerical and experimental results of a new method for producing flanges on hollow parts. With this new method, the flange is extruded by a movable sleeve. This innovative technique is modelled numerically by the finite element method. The effect of workpiece and finished product geometries on the forming process is investigated and failure modes are identfied. The numerical reults are then verified in experiments. The tests are conducted using a three-slide forging press equipped with a special device. The numerical and experimental results show a good agreement, which proves that the developed method is correct.

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