Steel Tube Flying Lead Accumulated Plastic Strain Calculation

2020 ◽  
Author(s):  
Amandeep Bansal ◽  
Mimi Batrony ◽  
Sunil Prakash ◽  
Vikash Anand
Keyword(s):  
Plastic Strain ◽  
Steel Tube ◽  
Strain Calculation

Effect of Strain History on Steel Tube Umbilical

2007 ◽  
Author(s):  
Alan Dobson
Keyword(s):  
Mechanical Properties ◽  
Plastic Strain ◽  
Low Cycle Fatigue ◽  
Steel Tube ◽  
Fatigue Properties ◽  
Strain History ◽  
Stress Cracking ◽  
Induced Stress ◽  
The Impact ◽  
Strain Cycling

The effect of repeated plastic strain on the mechanical properties of reeled super duplex tube used in the construction of umbilical riser systems is assessed. The impact of typical plastic strain cycles on the fatigue properties of tubing, mechanical properties of the tubing and the susceptibility of hydrogen embrittlement of the tubing has been investigated. There is evidence that plastic strain cycles have an effect upon the fatigue life of the tube; which can be attributed to a low cycle fatigue mechanism. There is no evidence that plastic strain cycling to specified limits has an effect upon the susceptibility of the material to Hydrogen Induced Stress Cracking (HISC) and typical plastic strain cycles have no degenerative effect upon the mechanical properties of super duplex tube and radial welds.

Variation of elastic modulus of high strength 21-6-9 tube and its influences on forming quality in numerical control rotary draw bending

2021 ◽  
pp. 095440622199069
Author(s):  
Jun Fang ◽  
Fang Ouyang ◽  
Shiqiang Lu ◽  
Kelu Wang ◽  
Xuguang Min ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Plastic Strain ◽  
High Strength ◽  
Steel Tube ◽  
Numerical Control ◽  
Repeated Loading ◽  
Stainless Steel Tube ◽  
Rotary Draw Bending ◽  
Forming Quality ◽  
Draw Bending

Elastic modulus is one of the most crucial mechanical property parameters that affects the plastic forming quality of bent parts, especially for springback. Elastic modulus practically varies with plastic deformation, and its precise description is necessary to enhance simulation precision for tube bending and gain steady, high-precision bent components by actual bending. Using repeated loading-unloading tensile tests (RLUTTs), the variation of elastic modulus of high strength 21-6-9 stainless steel tube (21-6-9-HS tube) in terms of plastic strain has been obtained, which its decreases rapidly at the beginning, then decreases tardily and tends to be stable in the end with increasing the plastic strain. The variation can be expressed as a first order exponential decay function. By embedding the variation of elastic modulus with the plastic strain into ABAQUS software to simulate numerical control (NC) rotary draw bending of the 21-6-9-HS tube, the prediction precision for the springback angle, springback radius, maximum cross section distortion ratio and maximum wall thinning ratio can be improved by 11.98%, 7.62%, 35.53% and 11.55%, respectively.

scholarly journals Analysis of the multistage cyclic loading test on resilient modulus value64

2016 ◽  
Vol 48 (1) ◽  
pp. 53-65 ◽  
Author(s):  
Wojciech Sas ◽  
Andrzej Głuchowski ◽  
Emil Soból ◽  
Jacek Bąkowski ◽  
Alojzy Szymański
Keyword(s):  
Cyclic Loading ◽  
Plastic Strain ◽  
Resilient Modulus ◽  
Soil Mass ◽  
Loading Test ◽  
Cyclic Loading Test ◽  
The Road ◽  
Strain Calculation ◽  
Number Of Cycles ◽  
Proper Analysis

Abstract Analysis of the multistage cyclic loading test on resilient modulus value. Upon cyclic excitation of soil mass, two types of strain can be recognized, namely elastic and plastic one. Proper analysis of these two types of deformations can help engineers in designing more reliable structures. In this study, a multistage uniaxial cyclic loading in unconfined conditions was performed. Tests were performed in order to characterize strain response to repeated excitation. Soil sample under cyclic loading was recognized as exhibiting the symptoms of a plastic strain growth during the cyclic loading process with exponential manner, when compared to number of cycles. Soil in this study was reconstituted and compacted by using the Proctor method to simulate conditions similar to those affecting the road subbase. The soil was recognized as sandy clay. Results were analysed and a proposition of empirical formula for plastic strain calculation with the use of characteristic stress values was presented. The resilient modulus values were also calculated. The Mr value was within range from 45 to 105 MPa. The conclusions concerning the cyclically loaded soil in uniaxial conditions were presented.

Effects of Plastic Deformation on Fatigue Life of Superduplex Steel Tube Umbilical

2012 ◽  
Author(s):  
Diego F. S. Burgos ◽  
Luís F. S. Parise ◽  
Rafael G. Savioli ◽  
Gustavo H. B. Donato ◽  
Antonio P. Nascimento Filho ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Plastic Strain ◽  
Fatigue Behavior ◽  
Axial Loading ◽  
Steel Tube ◽  
Fatigue Tests ◽  
Steel Tubes ◽  
Fatigue Data ◽  
Different Levels

This work presents an experimental investigation of the effects of plastic strain on the fatigue behavior of superduplex steel tubes. Fatigue tests using conventional axial loading and a resonant bending setup conducted on 15mm OD tubes made of SAF2507 superduplex steel provides S × N data upon which effects of different levels of plastic strain can be assessed. Despite the inherent scatter in the measured fatigue data, the experiments reveal consistent trends and relatively small effects of plastic strain on fatigue behavior of superduplex steel tubes.

Accumulated Plastic Strain Evaluation of Steel Tube for Umbilical Cables

2008 ◽  
Author(s):  
Marcelo Corac¸a dos Santos ◽  
Rosianita Balena ◽  
Fernando de Paula ◽  
Matt Smith
Keyword(s):  
Mechanical Properties ◽  
Plastic Strain ◽  
Production Systems ◽  
Maximum Level ◽  
Steel Tube ◽  
Fatigue Tests ◽  
Acceptable Level ◽  
Quality Level ◽  
Tube Material ◽  
High Quality

This paper presents the tests performed for the qualification of the level of accumulated plastic strain (APS) to be respected by manufacturing and installation of SAF 2507 steel tube umbilicals. The manufacturing and installation processes for steel tube umbilicals are carried out through repetitive cycles of coiling and uncoiling the tubes or umbilical during manufacturing. During installation the umbilical is also coiled and uncoiled in installation reels or vessel’s baskets (turn tables or carrousels) as well as straightened and bent under tension over sheaves or chutes. These operations impose tensile and compressive strains to tube, which means that the tube is submitted to work hardening and have its mechanical properties modified to a certain extent during its manufacturing and installation processes. Therefore, it becomes necessary to quantify the level of APS expected to occur during these processes and compare it to the maximum level of APS qualified for the tube material being used in order to ensure that the mechanical properties of the steel tube are maintained at a high quality level. The scope of this paper is to present the tensile and fatigue tests performed by Marine Production Systems do Brasil (Brazilian Oceaneering Factory) in strained and unstrained tubes and define a maximum acceptable level of APS. Both strain hardening and fatigue life influence effects are assessed. Based on the results of these tests, the maximum acceptable level of APS to be respected during the manufacturing and installation of umbilicals was defined and associated with this level, the S-N curve determined by the tests must be used for the umbilical service life fatigue analysis.

Plastic Deformation in Microtomed Sections

1971 ◽  
Vol 29 ◽  
pp. 458-459
Author(s):  
J. Temple Black
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Applied Stress ◽  
Elastic Strain ◽  
High Strain ◽  
Tool Material ◽  
Cutting Edge ◽  
Material Structure ◽  
Geometrical Constraints

The output of the ultramicrotomy process with its high strain levels is dependent upon the input, ie., the nature of the material being machined. Apart from the geometrical constraints offered by the rake and clearance faces of the tool, each material is free to deform in whatever manner necessary to satisfy its material structure and interatomic constraints. Noncrystalline materials appear to survive the process undamaged when observed in the TEM. As has been demonstrated however microtomed plastics do in fact suffer damage to the top and bottom surfaces of the section regardless of the sharpness of the cutting edge or the tool material. The energy required to seperate the section from the block is not easily propogated through the section because the material is amorphous in nature and has no preferred crystalline planes upon which defects can move large distances to relieve the applied stress. Thus, the cutting stresses are supported elastically in the internal or bulk and plastically in the surfaces. The elastic strain can be recovered while the plastic strain is not reversible and will remain in the section after cutting is complete.

Comparison of Substructures Between Uniaxial and Biaxial Deformation in 1100-0 Aluminum

1981 ◽  
Vol 39 ◽  
pp. 52-53
Author(s):  
D. L. Rohr ◽  
S. S. Hecker
Keyword(s):  
Plastic Strain ◽  
Cell Walls ◽  
Room Temperature ◽  
Mechanical Response ◽  
Biaxial Tension ◽  
Initial Deformation ◽  
Uniaxial Deformation ◽  
Biaxial Deformation ◽  
Stress States ◽  
Comprehensive Study

As part of a comprehensive study of microstructural and mechanical response of metals to uniaxial and biaxial deformations, the development of substructure in 1100 A1 has been studied over a range of plastic strain for two stress states.Specimens of 1100 aluminum annealed at 350 C were tested in uniaxial (UT) and balanced biaxial tension (BBT) at room temperature to different strain levels. The biaxial specimens were produced by the in-plane punch stretching technique. Areas of known strain levels were prepared for TEM by lapping followed by jet electropolishing. All specimens were examined in a JEOL 200B run at 150 and 200 kV within 24 to 36 hours after testing.The development of the substructure with deformation is shown in Fig. 1 for both stress states. Initial deformation produces dislocation tangles, which form cell walls by 10% uniaxial deformation, and start to recover to form subgrains by 25%. The results of several hundred measurements of cell/subgrain sizes by a linear intercept technique are presented in Table I.

Steel-tube reheating

1989 ◽  
Vol 3 (4) ◽  
pp. 235
Author(s):  
W.R. Duguid ◽  
P.A. Funnell
Keyword(s):  
Steel Tube

Lamellar grains distribution and plastic strain heterogeneities in TiAI cast samples. Experiments and modelling

2004 ◽  
Vol 92 (1-2) ◽  
pp. 69-76 ◽  
Author(s):  
L. Gélébart ◽  
M. Bornert ◽  
T. Bretheau ◽  
D. Caldemaison ◽  
J. Crépin ◽  
...  
Keyword(s):  
Plastic Strain
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