scholarly journals Analisys of Welding Crack on The Under Frame of Wagon for Cement Bags Transportation Using Euro Code, Measurement and Finite Element

2019 ◽  
Vol 269 ◽  
pp. 03003
Author(s):  
Agus Sasmito ◽  
Yudi Irawadi ◽  
Hary Soebagyo
Keyword(s):  
Complex Geometry ◽  
Fem Analysis ◽  
Steel Structure ◽  
Elastic Behavior ◽  
Bottom Part ◽  
Lower Yield Stress ◽  
Welding Joint ◽  
Fatigue Design ◽  
Strength Capacity ◽  
Geometrical Shapes

The Underframe of Wagon steel structure have both complex geometry and loading conditions producing complex Underframe structure behaviour which is hard to estimate and analyse using the traditional fatigue calculation methods. The impacts of the loading direction, loading type and detail geometrical shapes, i.e. Underframe components which are working in a group, need to be considered carefully in the stress analysis. Using the assumption of elastic behavior for all the underframe structural systems, in which sources of stress increased that have significant effects on the fatigue strength capacity are several included, can over/lower yield stress values to be analyzed in fatigue design. The application of the advanced stress assessment methods in the welding area using the Euro Code calculation studied in this paper produces more accurate stress results that can explain welding crack during operation in The car body of Wagon Steel. Based on Euro Code stress assesment, FEM analysis and measurement can be known that crack on the welding joint of wagon bottom part due to lack finishing of the welding joint. The IIW recommendations can be use in order to repair welding joint finishing to avoid crack fatigue.

Philarmonie de Paris: steel structure design in a complex-geometry building

2014 ◽  
Vol 102 (10) ◽  
pp. 2508-2515
Author(s):  
Romina Gonzalez ◽  
David Garcia ◽  
Leonardo Dominguez ◽  
Gonzalo Garcia ◽  
Jorge Lopez ◽  
...  
Keyword(s):  
Complex Geometry ◽  
Steel Structure ◽  
Structure Design

Strength evaluation of solar module steel structure and FEM analysis on beam element model

2017 ◽  
Vol 2017 (0) ◽  
pp. OS1708 ◽  
Author(s):  
Yasuhiro MAEDA ◽  
Yoshihito OZAWA ◽  
Wataru TAKANO ◽  
Naoto TAKEHANA ◽  
Yuta ONODE
Keyword(s):  
Fem Analysis ◽  
Steel Structure ◽  
Element Model ◽  
Beam Element ◽  
Solar Module ◽  
Strength Evaluation

scholarly journals Decrease in coal losses during mining of contiguous seams in the near-bottom part at Vorkuta deposit

2020 ◽  
Vol 244 ◽  
pp. 395-401
Author(s):  
Oleg Kazanin ◽  
Valeriy Yaroshenko
Keyword(s):  
Complex Geometry ◽  
Economic Effect ◽  
High Volume ◽  
Technological Scheme ◽  
Mining Equipment ◽  
Mining Operations ◽  
Bottom Part ◽  
Geological Conditions ◽  
The Impact ◽  
Mine Layout

The problem of formation of extended zones with high rock pressure (HRP) from safety pillars at the boundaries of extraction pillars formed due to the mine layout of complex geometry is considered at the example of JSC Vorkutaugol mines. A detailed analysis of the remaining reserves of the near-bottom part of the deposit was carried out to estimate losses and the impact of HRP zones from the Chetvertyi protective seam to mining operations on the Troinoi upper seam along with the possibilities for the reduction of sizes of HRP zones at the account of expanding the underworked space. Due to research on the near-bottom part of the Vorkuta deposit, within the framework of the accepted layout, a zone at the Komsomolskaya mine and two zones at the Zapolyarnaya-2 mine were singled out, at which losses at the boundaries of the extraction pillars amount up to 13-22 % of the total resources of the mine field. The high volume of losses in these pillars indicates the relevance of research on the priority extraction impact of protective seams on the efficiency and safety of mining operations in the working area of underworked and HRP zones. Based on the analysis of foreign and Russian experience in the pillar cleaning-up at the boundaries of working areas and the methodical guidelines and instructions, a technological scheme was developed that allows increasing the coal mining recovery factor in the near-bottom part of the Vorkuta deposit from 0.75 to 0.9 without fundamental changing of the ventilation and transport networks and also without purchasing any additional mining equipment. The conducted economic calculations confirmed the effectiveness of implementing the new technological scheme for cleaning-up reserves at the boundaries of extraction districts. The economic effect is from 0.079 to1.381 billion rubles of additional profit from coaxial extraction pillars, depending on the mining and geological conditions and the size of the pillars.

Background for Revision of DNV-RP-C203 Fatigue Analysis of Offshore Steel Structure

2005 ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Offshore Structures ◽  
Fatigue Analysis ◽  
Time Interval ◽  
Fatigue Design ◽  
The World ◽  
New Research ◽  
Made In

The last revision of the DNV recommended practice “Fatigue Analysis of Offshore Steel Structures” is from October 2001. During use of this standard some feed back from designers around the world have been received. Also some new research in the area has been performed in the time interval from it was first developed. It is also realised that the document is being used for fatigue design of some other types of details and structures than was thought of when the document was originally developed. Therefore it was now found convenient to revise the document to incorporate the experience gained and new research and developments made in the area of fatigue of offshore structures the last 7 years since the main content for this recommended practice was developed.

Horizontal Versus Vertical Annealing of Silicon Wafers at High Temperatures

2007 ◽  
Vol 131-133 ◽  
pp. 413-418 ◽  
Author(s):  
G. Kissinger ◽  
A. Fischer ◽  
G. Ritter ◽  
V.D. Akhmetov ◽  
Martin Kittler
Keyword(s):  
Displacement Vector ◽  
Complex Loading ◽  
Fem Analysis ◽  
Silicon Wafers ◽  
Elastic Behavior ◽  
Shear Stresses ◽  
3D Fem ◽  
Induced Stress ◽  
Order Of Magnitude ◽  
Von Mises

The gravitational induced shear stresses in 200 mm silicon wafers supported in verticaltype or horizontal-type furnace were calculated using 3D-FEM analysis of the displacement vector assuming linear elastic behavior of the anisotropic material. For comparison of the two complex loading cases and for relating the effect of gravitational constraints to the mechanical strength of the wafers, the invariant von Mises shear stress τM was chosen. The computed maximum values of τM demonstrate that the gravitational induced stress for vertical processing is approximately one order of magnitude less than the gravitational induced stress for horizontal processing. The experimental results obtained from processing of 200mm wafers with different oxygen concentration in horizontal and vertical boats at 1200°C are in an excellent agreement with the theoretical simulations.

Structure Design and Analysis of a Locking Band Type Quick Opening End Closure Using a New Saddle-Shaped Sealing Ring for Natural Gas Filters

2015 ◽  
Author(s):  
Ping Chen ◽  
Shumin Zhou ◽  
Ying Shi
Keyword(s):  
Natural Gas ◽  
Stress Test ◽  
Fem Analysis ◽  
Steel Structure ◽  
Structure Design ◽  
National Standard ◽  
Internal Diameter ◽  
Sealing Performance ◽  
Natural Gas Transmission ◽  
Sealing Ring

A quick opening closure using a new rubber sealing ring was proposed in this paper, which can be used in natural gas transmission filters. An innovative saddle-shaped sealing ring with the feature of floatability was designed for substituting of traditional rubber C-ring. A lager gap could be allowed between the door and the top flange which made the assembling and disassembling easier than before. The theory of strength calculation and check for the whole steel structure were also presented. For an actual engineering case, a device with internal diameter of DN1550 (62inches) and design pressure of 12.6MPa (1827.5psi) was designed by rule according to Chinese national standard GB150 and analyzed by FEA (ANASYS). In addition, the sealing performance was simulated by FEM analysis (ABAQUS). Finally, the prototype was produced and the experiments for its sealing and load-bearing performance using hydrostatic test and stress test were carried out successfully.

Elastic properties of rock salt: Laboratory measurements and Gulf of Mexico well-log analysis

Geophysics ◽  
2017 ◽  
Vol 82 (5) ◽  
pp. D303-D317 ◽  
Author(s):  
Jingjing Zong ◽  
Robert R. Stewart ◽  
Nikolay Dyaur ◽  
Michael T. Myers
Keyword(s):  
Gulf Of Mexico ◽  
Elastic Properties ◽  
Rock Salt ◽  
Model Building ◽  
Complex Geometry ◽  
Rock Physics ◽  
P Wave ◽  
Elastic Behavior ◽  
Laboratory Measurements ◽  
Wave Velocities

Rock salt (essentially halite) is a special type of sedimentary rock that has played a large role throughout tectonic and economic history. The unique physical properties of halite (ductility, low density, flowability, and impermeability) can be critical factors in hydrocarbon traps and underground storage. However, seismic imaging and interpretation can be challenging when salt structures are present due to their complex geometry and large impedance contrasts relative to surrounding rocks. To investigate the properties of rock salt in terms of elastic parameters, we use ultrasonic laboratory measurements and well logs. In the laboratory, we have analyzed the effects of composition, crystalline structure, pressure, and temperature on the elastic behavior of a variety of rock salt samples. The samples include pure halite (>95 wt%) from the Gulf of Mexico (GOM) area, argillaceous rock salt from the Zipaquirá Mine, Colombia, and crystalline salt from the Goderich Mine, Canada. Current measurements suggest that the GOM salt cores behave isotropically in general. The Zipaquirá salt samples show velocity and density variations on account of their heterogeneous composition. The Goderich halite crystals display distinct cubic anisotropy. Measurements on the GOM samples at varying confining pressures and temperatures indicate that increasing pressure elevates velocity whereas increasing temperature decreases velocity. From the analysis of 145 log suites from boreholes drilled through rock salt in the northern GOM, we found that, within the salt formations, P-wave velocities increased slightly with depth (approximately [Formula: see text] per km). The S-wave velocities from three wells range from 2280 to [Formula: see text]. Bulk densities from all the wells cluster at [Formula: see text]. These laboratory and log measurements provide new values for the elastic properties of rock salt, which can assist in velocity model building, synthetic seismogram generation, and the understanding of the rock physics of halite.

Analysis of Cracks and Stresses of Welded Attachments on Full-Scale Plate Girder under Fatigue Loading

2006 ◽  
Vol 324-325 ◽  
pp. 459-462 ◽  
Author(s):  
Myung Gu Lee ◽  
Seung Yong Lee ◽  
Cheol Woo Park
Keyword(s):  
Fatigue Damage ◽  
Fatigue Cracks ◽  
Steel Structure ◽  
Fatigue Loading ◽  
Design Criterion ◽  
Full Scale ◽  
Parent Metal ◽  
Girder Bridges ◽  
Fatigue Design ◽  
Plate Girder

In steel structure systems such as plate girder bridges and framed structures, fatigue damage used to occur at welded areas rather than primary structural members. These damages and behaviors of the welded attachments need to be extensively investigated so that the fatigue design criterion can effectively control the fatigue damage of steel structure systems. This study utilized a full-scale plate girder on which various welding attachments were mounted. The welded attachments investigated herein included flange gussets, web gussets, vertical stiffeners, and cover plates. The fatigue cracks initiated at the longitudinal end of joint area of the weld bead and the parent metal where stress was significantly concentrated. The initiated fatigue cracks developed along the weld path and then, propagated to the parent metal in the direction perpendicular to the principal stress. The fatigue cracks developed even under a compressive stress when a significant residual stress was experienced from the welding. The fatigue strengths of the each welded attachment were evaluated and compared with the current fatigue design specifications in AASHTO [1] and JSSC [2].

scholarly journals Investigation by Digital Image Correlation of Mixed-Mode I and II Fracture Behavior of Polymeric IASCB Specimens with Additive Manufactured Crack-Like Notch

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1084
Author(s):  
Tommaso Maria Brugo ◽  
Ivo Campione ◽  
Giangiacomo Minak
Keyword(s):  
Additive Manufacturing ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Complex Geometry ◽  
Selective Laser Sintering ◽  
Fem Analysis ◽  
Image Correlation ◽  
Mode I ◽  
Plastic Behavior ◽  
J Integral

In this work, the fracture mechanics properties of polyamide (PA) specimens manufactured by the selective laser sintering (SLS) technology are investigated, in which an embedded crack-like notch was inserted in the design and produced during the additive manufacturing (AM) phase. To cover a wide variety of mode I/II mixity levels, the inclined asymmetrical semicircular specimen subjected to three points loading (IASCB) was employed. The investigation was carried out by analyzing the full displacement field in the proximity of the crack tip by means of the digital image correlation (DIC) technique. To characterize the material, which exhibits a marked elastic-plastic behavior, the quantity J-integral was evaluated by two different methods: the first one exploits the full fields measured by the DIC, whereas the second one exploits the experimental load–displacement curves along with FEM analysis. The DIC methodology was experimentally validated and proposed as an alternative method to evaluate the J-integral. It is especially suited for conditions in which it is not possible to use the conventional LDC method due to complex and possibly unknown loading conditions. Furthermore, results showed that the AM technique could be used effectively to induce cracks in this type of material. These two aspects together can lead to both a simplification of the fracture characterization process and to the possibility of dealing with a wider number of practical, real-world scenarios. Indeed, because of the nature of the additive manufacturing process, AM crack-like notches can be sintered even having complex geometry, being three-dimensional and/or inside the tested structure.

scholarly journals Simulating behavior and evaluating rational parameters of the tubular steel joint using flanges and bolts by FEM analysis

2020 ◽  
Vol 2 (4) ◽  
pp. First
Author(s):  
Nguyen Trong Vinh ◽  
Le Anh Tuan
Keyword(s):  
Shear Force ◽  
Rapid Development ◽  
Fem Analysis ◽  
Steel Structure ◽  
Steel Tube ◽  
Tubular Structure ◽  
Medium Size ◽  
Large Size ◽  
Welding Joints ◽  
The Relationship

With many advantages, nowadays, the structure using tubular steel structure is more and more widely used in all kinds of construction. In response to the rapid development of the tubular steel structure, it has been had a lot of research about the joints of this structure. Welding joints and joints using flanges and bolts are used most popular in the tubular structure. However, most of the research concentrate about welding joints, the joints using flanges and bolts are only mentioned in the case of simple load-bearing such as tension or compression or bending without computational instructions in the case of complex bearing forces (concurrent shear force and bending or concurrent tension/compression and bending or tension/compression and twisting).The research using FEM analysis for joint of steel tubular with different sizes ( small size, medium-size, and large size) and parameters of the thickness of the flange, bolt’s diameter, the thickness of steel tube that rule of the relation between them. The study outlines the behavior for joints of tubular structure using flanges and bolts in the case of concurrent shear force and bending, thereby proposing the rational parameters of the joint (the relationship between the thickness of the flange, the diameter of the bolt and thickness of steel tubes). Base on the results of this research, the standard for choosing a suitable joint of steel tubular in different conditions. Besides that, the research’s results are also one of the important parts in conducting the standard of design joint of steel tubular.

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