Plastic Constraint-Matched Pin-Loaded SENT Specimen for Fracture Analysis of Radially Growing Longitudinal Cracks in Thin-Walled Piping

2020 ◽  
Author(s):  
Jevan Furmanski ◽  
Peter Sarosi ◽  
Cary Marzinsky ◽  
Don Carpenter ◽  
Neeraj Thirumalai
Keyword(s):  
Wall Thickness ◽  
Low Carbon Steel ◽  
Standard Test ◽  
Thin Wall ◽  
Low Carbon ◽  
Radial Fracture ◽  
Element Analysis ◽  
Seam Weld ◽  
Plastic Constraint ◽  
Thin Walled

Abstract In recent years increased attention has been given to the transferability of standardized fracture test data to thin-walled pressurized equipment. For smaller diameter piping, for example, standard test specimens loaded in “hoop” tension are not possible due to pipe curvature and thinner wall thickness (often less than 1/3 inch). Further, it is not clear that standardized fracture specimens produce transferrable results to the seam weld fracture problem due to low plastic constraint, which is exacerbated in thin wall pipe. Single-edge notched tension (SENT) specimens were fabricated by extracting a segment pipe wall and finishing to a parallel piped incorporating nearly all the wall thickness. These segments were electron beam welded to low carbon steel grip ends to produce only localized heat affected zone without affecting the test section. The result is a nearly ideal pin-loaded SENT specimen for radial fracture testing. This geometry was evaluated with 2D and 3D nonlinear finite element analysis in Abaqus, and plastic constraint matching was evaluated compared to a thin-walled pipe under internal pressure with a radially growing crack. A nearly ideal plastic constraint match between the pin-loaded SENT and radial seam weld crack was confirmed up to about 500 psi-in, which is substantially beyond a typical JIc in the X52 steel used in the analysis. Thus, pinned SENT testing is recommended for evaluation of radial fracture in thin-walled piping.

Measurement and Calculation of Elastic Properties in Low Carbon Steel Sheet

2005 ◽  
Vol 495-497 ◽  
pp. 1591-1596 ◽  
Author(s):  
Vladimir Luzin ◽  
S. Banovic ◽  
Thomas Gnäupel-Herold ◽  
Henry Prask ◽  
R.E. Ricker
Keyword(s):  
Carbon Steel ◽  
Elastic Property ◽  
Elastic Properties ◽  
Steel Sheet ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Forming Process ◽  
Element Analysis ◽  
Wide Range ◽  
Carbon Steel Sheet

Low carbon steel (usually in sheet form) has found a wide range of applications in industry due to its high formability. The inner and outer panels of a car body are good examples of such an implementation. While low carbon steel has been used in this application for many decades, a reliable predictive capability of the forming process and “springback” has still not been achieved. NIST has been involved in addressing this and other formability problems for several years. In this paper, texture produced by the in-plane straining and its relationship to springback is reported. Low carbon steel sheet was examined in the as-received condition and after balanced biaxial straining to 25%. This was performed using the Marciniak in-plane stretching test. Both experimental measurements and numerical calculations have been utilized to evaluate anisotropy and evolution of the elastic properties during forming. We employ several techniques for elastic property measurements (dynamic mechanical analysis, static four point bending, mechanical resonance frequency measurements), and several calculation schemes (orientation distribution function averaging, finite element analysis) which are based on texture measurements (neutron diffraction, electron back scattering diffraction). The following objectives are pursued: a) To test a range of different experimental techniques for elastic property measurements in sheet metals; b) To validate numerical calculation methods of the elastic properties by experiments; c) To evaluate elastic property changes (and texture development) during biaxial straining. On the basis of the investigation, recommendations are made for the evaluation of elastic properties in textured sheet metal.

scholarly journals Application of digital image correlation system for analysis of local plastic instabilities of perforated thin-walled bars

2018 ◽  
Vol 196 ◽  
pp. 01032 ◽  
Author(s):  
Andrzej Piotrowski ◽  
Marcin Gajewski ◽  
Cezary Ajdukiewicz
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Plastic Material ◽  
Low Carbon Steel ◽  
Image Correlation ◽  
Theoretical Point ◽  
Low Carbon ◽  
Compression Tests ◽  
Correlation System ◽  
Thin Walled

In the presented paper the local instabilities occurring in compression test of perforated thin-walled bars of low slenderness are observed using digital image correlation system ARAMIS. The tested samples slenderness is so low, that from theoretical point of view we are dealing with compression tests of some perforated shells. The samples are made from typical low carbon steel, which has to be treated as elasto-plastic material. Because of that, the final geometry of the sample (after unloading) is also analysed giving a good data for calibration of the theory of elasto-plasticity for large deformations. In analysed cases the total strain values are not exceptionally large, while local rotation (and permanent deformations) have significant values.

Impeller Finite Element Analysis of Extractable Explosion-Proof Contra-Rotating Axial Fan for Mine Local Ventilation FBDC

2012 ◽  
Vol 605-607 ◽  
pp. 1372-1376
Author(s):  
Qiu Dong He ◽  
Wen Qi Yu ◽  
Shu Fen Xiao
Keyword(s):  
Finite Element ◽  
Static Pressure ◽  
Three Dimensional ◽  
Low Carbon Steel ◽  
Sound Level ◽  
Low Carbon ◽  
Axial Fan ◽  
Element Analysis ◽  
Local Ventilation ◽  
Three Dimensional Finite Element

To improve the impeller safety and reliability of extractable explosion-proof contra-rotating axial fan for mine local ventilation, Extractable Fan FBDC№9.0/2×30 was taken as the research object, and an approximate three-dimensional finite element computation model was built by using ANSYS software. The stress and displacement were calculated, too. By testing, the fan works stably. The air quantity is 655-978 m3/min, total pressure, 3443-412Pa, static pressure, 3314-118Pa. And the highest static pressure efficiency is up to 70.35%, A-weight Specific Sound Level is 17.5dB. Furthermore, the intension and stiffness of the impeller meet requirements. Sample test and field using show that the computation and the model of this impeller are right. Through reasonable design, the impeller of contra-rotating axial fan with equally-thick circular arc blade profile and ordinary hot-rolling low-carbon steel blades has the intension and the stiffness which meets demands, and the air performance reaches higher level.

Energy Absorption of Thin Walled Members Under Axial Compressive Loading

2014 ◽  
Author(s):  
Eboreime Ohioma ◽  
Muhammad Ali ◽  
Khairul Alam
Keyword(s):  
Energy Absorption ◽  
Cross Sections ◽  
Compressive Loading ◽  
Thin Wall ◽  
Analysis Software ◽  
Element Analysis ◽  
Cross Sectional ◽  
Compressive Loads ◽  
Thin Walled ◽  
Deformation Modes

This study was conducted to investigate the effects of cross-sectional geometry on thin wall axial crushing members for the purpose of improved energy absorption. A total of five geometrically equivalent shapes (same wall thickness area, material, and length) were analyzed namely, triangle, rectangle, square, pentagon, and circle. The deformation modes and energy absorption of the members were studied under compressive loads and compared using ABAQUS/Explicit module, finite element analysis software. The simulations revealed that for the five geometrically equivalent cross sections under equal loading conditions, the pentagon shaped member absorbed the highest amount of energy. As compared to baseline rectangle member, the pentagon member absorbed approximately 25–28% more energy.

Analysis on the Residual Stresses in Functionally Gradient Fe360/Glass-Ceramic Coatings

2013 ◽  
Vol 717 ◽  
pp. 215-220
Author(s):  
Li Ming Zhou ◽  
Wei Gong ◽  
En Ze Wang
Keyword(s):  
Residual Stress ◽  
Glass Ceramic ◽  
Volume Fraction ◽  
Geometric Model ◽  
Low Carbon Steel ◽  
Ceramic Coatings ◽  
Low Carbon ◽  
Element Analysis ◽  
Functionally Gradient ◽  
Gradient Coatings

A novel functionally gradient composite was reported in this article. The composite material are composed of plain low carbon steel Fe360 as a substrate and glass-ceramics containing ZrO2 reinforcing particles as a coating. Based on a mathematical model of the residual stress, the geometric model and finite element analysis models of the Fe360/glass-ceramic gradient coatings were established. The residual stress of the gradient layers was calculated with the commercial software ANSYS 10.0. The results showed that the differences of thermal expansion coefficient and shrinkage rate in each layer resulting from the difference of the volume fraction of ZrO2 in each gradient layer could make the surface layer generate suitable compressive stress. The maximum residual stress presents itself at the interface between the substrate and the gradient coatings. The layer numbers and the thickness of graded coatings have a significant effect on the residual stress.

scholarly journals The Design and Analysis of Internally Stiffened GFRP Tubular Decks—A Sustainable Solution

2018 ◽  
Vol 10 (12) ◽  
pp. 4538 ◽  
Author(s):  
Yeou-Fong Li ◽  
Habib Meda ◽  
Walter Chen
Keyword(s):  
Finite Element ◽  
Life Cycle Cost ◽  
Three Dimensional ◽  
Torsional Stiffness ◽  
Thin Wall ◽  
Low Carbon ◽  
Element Analysis ◽  
Finite Element Software ◽  
Deck Panels ◽  
Three Dimensional Models

The aim of this paper was to find an optimal stiffener configuration of thin-wall tubular panels made by glass fiber reinforced polymer (GFRP) composite material, which is a low carbon emission, low life cycle cost, and sustainable material. Finite-element analysis (FEA) was used to investigate the flexural and torsional stiffness of various internally stiffened sections of thin-wall GFRP decks. These decks consist of internally stiffened tubular profiles laid side by side and bonded together with epoxy to ensure the panel acts as an assembly. Three-dimensional models of the seven proposed decks were assembled with tubular profiles of different stiffener patterns. First, the non-stiffened tube profile was tested experimentally to validate the parameters used in the subsequent numerical analysis. Then, the finite element software, ANSYS, was used to simulate the flexural and torsional behavior of the decks with different stiffener patterns under bending and torsional loads. The decks with stiffener patterns such as “O” type, “V” type, and “D” type were found to be the most effective in bending. For torsion, there was a distinct tendency for deck panels with closed shaped stiffener patterns to perform better than their counterparts. Overall, the “O” type deck panel was an optimal stiffener configuration.

scholarly journals b EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF SQUARE DEEP DRAWING PROCESS FOR LAMINATED STEEL-BRASS SHEET METALS

2020 ◽  
Vol 20 (1) ◽  
pp. 12-24
Author(s):  
Hani Aziz Ameen
Keyword(s):  
Deep Drawing ◽  
Thickness Distribution ◽  
Low Carbon Steel ◽  
High Strength ◽  
Experimental Tests ◽  
Drawing Process ◽  
Low Carbon ◽  
Element Analysis ◽  
Blank Holder ◽  
Deep Drawing Process

In this paper, the drawability of two-layer (steel-brass) sheets to produce square cup, is investigated through numerical simulations, and experimental tests. Each material has its own benefits and drawbacks in terms of its physical, chemical and mechanical properties, so that the point of this investigation is taking the benefits of different materials, like (low density, high strength and resistibility of corrosion), at the same time and in a one part. ANSYS18 software is used to simulate the deep drawing process of laminated sheet. The deep drawing processes for square cup were carried out under various blank holder loads with different lubrication conditions (dry and lubricant) and with variable layer arrangement. The materials were low carbon steel st1008 and brass CuZn30 sheets with thickness of 0.5mm0and 0.58mm respectively. The thickness of laminated sheet blank was 1.1 mm and its diameter was 83 mm. The drawn cups with less imperfections and satisfactory thickness distribution were formed in this study. It is concluded the greatest thinning appear in the corner of the cup near the punch radius due to extreme stretching take place in this area. Experimental forming load, blank holder load, and thickness distribution are compared with simulation results. Good agreement between experimental and numerical is evident.

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