a multicoupled finite element analysis of resistance spot welding process

... method of element removal and reactivation and the use of a new initial temperature at T s to calculate the stress/strain of the solidified elements During the calculation, element removal and reactivation ... thermal and plastic strains, it can be seen that the total strains in both cases have a similar trend The total strain increases and then decreases, and at about 100 ns it increases rapidly and ... melting and solidification with the aid of the temperature history data obtained from the thermal analysis The reason for using a new initial temperature for a reactivated element is explained as follows...

Ngày tải lên: 06/05/2014, 08:55

... indicators and readings at each load increment noted The arrangement of test strain/dial gauges are shown in Figure Details of a bolt strain gauge are shown in Figure Figure - Strain / Dial gauge locations ... increased connection capacities still had a reserve of approximately 30% Overall the finite element analysis of extended end plate connections can be seen to provide advantages in terms of time and ... Engineering in Darlington and Kvaerner Oil and Gas in Middlesbrough Use of the MYSTRO and LUSAS software and technical support is also acknowledged as is the financial and technical assistance of the...

Ngày tải lên: 04/06/2014, 13:20

... Finite element idealisation of axisymmetric Fig Finite element idealisation of axisymmetric problem, mesh AM1 problem, mesh AM2 y p x 100mm 200mm Fig Finite element idealisation of plane strain ... the shear modulus of the layer material If the stress at the middle surface of a layer reaches the uniaxial yield stress of the layer ⎛ material, the whole layer is considered to be plastic and ... especially adaptive for analyzing some thick-walled pipes structures made by composite material! Elements containing differential material properties have differential stiffness or they have differential...

Ngày tải lên: 22/07/2014, 10:21

... 1959-1976 Droz, P., and Bazant, Z P., 1989, “Nonlocal Analysis of Stable States and Stable Paths of Propagation of Damage Shear Bands,” Cracking and Damage, edited by J Mazars and Z P Bazant, Elsevier, ... factor is a material property Damage—Breaking of bonds within a material Damage can be manifested as continuum damage (distributed microcracks), or as a single macrocrack Other forms of damage ... 1994) and applied to the analysis of size effect and localization of cracking damage (Jirasek and Bazant 1994) The model represents a system of interacting cracks using an integral equation that,...

Ngày tải lên: 24/10/2014, 21:58

... facial bones and cranial bones as well as intracranial injuries are evaluated based on the tolerance limits of the biomechanical parameters General trend of maximum intracranial biomechanical parameters ... to all of my colleagues and my best friends Arpan Gupta, Guo Shifeng, Zhu Jianhua, Zhuang Han, Liu Yilin, Kyrin Liong, Saeid Arabnejad Khanooki, Shahrokh Sepehri Rahnama, Ahmadali Tahmasebimoradi, ... wave propagation paths in the facial skeleton and the intracranial brain presented to study the association of the traumatic brain injury (TBI) with the facial trauma sequences Fractures of facial...

Ngày tải lên: 10/09/2015, 09:04

... separately Damage resistance of a material can be defined as the ability of the material not to undergo a permanent change due to a loading event [33], while damage tolerance relates to the capacity ... low-velocity impact on composite laminates generally consists of two types at the micro level, namely interlaminar damage, also known as delaminations, and intralaminar damage Intralaminar damage, which ... selection of commercially available finite element codes such as Abaqus/Standard, Abaqus/Explicit and LS-Dyna to study the topic of impact damage of composite materials Such codes have the capability...

Ngày tải lên: 10/09/2015, 09:04

... a back -analysis of an actual three-dimensional tunnel heading problem, namely the tunnelling operation of Contract 704 of the Northeast Mass Rapid Transit Line This back -analysis exercise leads ... will also be investigated This illustrates the feasibility of conducting detailed and realistic 3-D analyses on relatively modest computational platforms which are readily available A comparison ... been partially unloaded This is the approach used by the “3-D” analysis in commercial softwares such as PLAXIS V.7 (1998) 20 Table 2.1 Summary of Analytical research Reference Description of Study...

Ngày tải lên: 17/09/2015, 17:19

... Āplate, Ānail (m2) Aplate, Anail (m2) Ān Cross sectional area of 2D idealized plate and 3D nail Contact surface area of 2D idealized plate and 3D nail with soil Cross sectional area factor Af ... Modes of failure encountered by soil nailing (c) Combination of Internal and External Failure 1.1.3 Advantages and Disadvantages of Soil Nailing as a Geotechnical Application The main advantages of ... equation is obeyed: E plate A plate = En Anail Eplate = En × An where the area factor for smearing of axial stiffness, An = A nail A plate It is generally accepted that bending and shear resistance...

Ngày tải lên: 06/10/2015, 20:57

... data model The database schema is an example of a data model — a file format is not! A populated database — an instantiated schema, — stores facts about objects and the relational calculus can ... post-production data analysis tasks The tools have certainly matured, but it is the scale and complexity of the data coming from the applications that renders ad hoc data management and data visualization ... specifically calls for a particular field mapped onto a particular geometry, the data for that mapping may not even explicitly reside in a database table That is, many physical or mechanical measures...

Ngày tải lên: 30/03/2014, 22:20

... stress analysis, for most analyses of operational loads, linear analysis is adequate as it is usually undesirable to have operational loads that can lead to nonlinear material behavior or large ... flow analysis of coolant ponds, pollutants and contaminants, and air in ventilation systems; e electromagnetic analysis of antennas, transistors and aircraft signatures; f analysis of surgical ... two are not compatible The availability of a wide range of analysis capabilities in one program makes possible analyses of many complex real-life problems For example, the flow around a car and...

Ngày tải lên: 08/04/2014, 10:34

... details of folding joints (b) A sample vibration-mode shape of a five-module truss as obtained via finite element analysis (Courtesy: AIAA) 14 Hutton: Fundamentals of Finite Element Analysis Basic ... LINEAR SPRING AS A FINITE ELEMENT A linear elastic spring is a mechanical device capable of supporting axial loading only and constructed such that, over a reasonable operating range (meaning ... Fundamentals of Finite Element Analysis Basic Concepts of the Finite Element Method Text © The McGraw−Hill Companies, 2004 1.5 Examples of Finite Element Analysis Figure 1.7 A mesh of finite elements...

Ngày tải lên: 08/04/2014, 10:37

... details of folding joints (b) A sample vibration-mode shape of a five-module truss as obtained via finite element analysis (Courtesy: AIAA) 14 Hutton: Fundamentals of Finite Element Analysis Basic ... LINEAR SPRING AS A FINITE ELEMENT A linear elastic spring is a mechanical device capable of supporting axial loading only and constructed such that, over a reasonable operating range (meaning ... Fundamentals of Finite Element Analysis Basic Concepts of the Finite Element Method Text © The McGraw−Hill Companies, 2004 1.5 Examples of Finite Element Analysis Figure 1.7 A mesh of finite elements...

Ngày tải lên: 26/05/2014, 03:41

... solver • Automated fast profile optimization • SAP2000 • Non-linear Pushover Analysis General Dynamic Analysis Analysis Options Eigenvalue analysis with an accelerated subspace iteration algorithm ... t ) Analysis Options Extensive Analysis Capabilities Static and/or dynamic response spectrum analysis • P-delta analysis with either static or dynamic analysis • Blocked active column equation ... vehicle loads • SAP2000 • User-defined truck, lane and train loads Bridge Analysis Bridge Analysis Determination of maximum and minimum displacement a nd reactions • SAP2000 • Capable of handing...

Ngày tải lên: 11/06/2014, 03:16

... product of a matrix, A, and a scalar, q, is a matrix, C, in which cij = qaij T T The transpose of a matrix, A, denoted A , is a matrix in which aij = a ji A is T T called symmetric if A = A , and ... invariants I1 (A) , I2 (A) , and I3 (A) For a scalar-valued function f (A) , df (A) = ∂f  ∂f  da = tr  dA ,  A  ∂aij ij ∂f  ∂f    =  A  ij ∂aij (2.81) However, with a = VEC (A) , we can also ... that x is a function of X and t and that T is also a function of X and t The relations are written as x(X, t) and T(X, t), and it is assumed that x and T are continuously differentiable in X and...

Ngày tải lên: 27/06/2014, 15:20

... details of folding joints (b) A sample vibration-mode shape of a five-module truss as obtained via finite element analysis (Courtesy: AIAA) 14 Hutton: Fundamentals of Finite Element Analysis Basic ... LINEAR SPRING AS A FINITE ELEMENT A linear elastic spring is a mechanical device capable of supporting axial loading only and constructed such that, over a reasonable operating range (meaning ... Fundamentals of Finite Element Analysis Basic Concepts of the Finite Element Method Text © The McGraw−Hill Companies, 2004 1.5 Examples of Finite Element Analysis Figure 1.7 A mesh of finite elements...

Ngày tải lên: 08/08/2014, 17:20

... F2 and F4 are to be applied such that the resultant force in element is zero and node displaces an amount Hutton: Fundamentals of Finite Element Analysis Stiffness Matrices, Spring and Bar Elements ... static indeterminacy is automatically accommodated As the reader may recall from study of mechanics of materials, the solution of statically indeterminate systems requires 55 Hutton: Fundamentals ... the appropriate mailbox In this fashion, each element is processed in sequence and its stiffness characteristics added to the global matrix After all elements are processed, the array of mailboxes...

Ngày tải lên: 08/08/2014, 17:20

... finite element software packages, buckling and stress stiffening analyses are available as options when such an element is used in an analysis (The reader should be aware that buckling and stress ... perpendicular to the plane of loading All connections are treated as welded joints Using two beam-axial elements and the node numbers as shown, determine Hutton: Fundamentals of Finite Element Analysis ... of these observations regarding rotations, the nodal variables to be associated with a flexure element are as depicted in Figure 4.4 Element nodes and are located at the ends of the element, and...

Ngày tải lên: 08/08/2014, 17:20

... (a) (b) Figure 6.14 A four-node rectangular element showing (a) the translation to natural coordinates, (b) the natural coordinates of each node 185 Hutton: Fundamentals of Finite Element Analysis ... is because the base and height of any triangle so formed are constants Further, as the dashed line is moved closer to node 1, area A increases linearly and has value A = A , when evaluated at node ... Figure 6.11 (a) Area A1 associated with either P or P is constant (b) Lines of the constant area coordinate L1 where A is the total area of the triangle Clearly, the area coordinates are not independent,...

Ngày tải lên: 08/08/2014, 17:20

... rectangular element (known as the parent element) element via a mapping process Figure 6.21 shows the parent element and its natural (r, s) coordinates and the quadrilateral element in a global ... take a general approach initially; that is, a specific element geometry is not used Instead, we assume a two-dimensional element having M nodes Hutton: Fundamentals of Finite Element Analysis Applications ... cylindrical coordinates (b) A threenode triangle in cylindrical coordinates at an arbitrary value ␪ Hutton: Fundamentals of Finite Element Analysis Interpolation Functions for General Element Formulation...

Ngày tải lên: 08/08/2014, 17:20

... Fundamentals of Finite Element Analysis 278 Applications in Heat Transfer CHAPTER Text © The McGraw−Hill Companies, 2004 Applications in Heat Transfer the residual equations can be rearranged and ... peripheral dimension, and A is cross-sectional area at the tip The actual heat transfer is less than qmax , so we Hutton: Fundamentals of Finite Element Analysis Applications in Heat Transfer ... } − h(2t b)Ta − Ta Again, we observe that the average temperature of the nodes associated with the area of the edge appears Stated another way, the convection area is allocated equally to the...

Ngày tải lên: 08/08/2014, 17:20