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Abaqus CAE- buckling analysis eigenvalue

Dear members,

 

my question is about how to use the Abaqus CAE eigenvalue for a linear buckling analysis.

I did a linear buckling analysis for a gFRP vertical panel (h:270  thick:20 w:50 cm). I applied a uniform pressure with value 1 on the top of the panel along the Z axis.

Mode 1 gives me an Eigenvalue of 52853 (please see the attachment). I know that in order to obtain the maximum buckling stress I should multiplicate the eigenvalue for the load appied. It means that the value for the buckling stress is 52853 (N/cm2).

Look for free-code UMAT on polymer viscoplasticity model of M.C. Boyce

I just attended USNCCM11, and heard from a presentation that there should be free code for polymer viscoplasticity model from M.C. Boyce.Unfortunately, I googled from half an hour and dowloaded nothing this afternoon. Can anybody give more info ?

Thanks in advance !

Material thermal conductivity in Abaqus

Choose a channel featured in the header of iMechanica: 

Hi,

I'm trying to simulate the thermal cycling of a cylinder between 0-100
degC, however the model I am trying to replicate does not have a thermal
conductivity assigned. I'm now under the impression that there is no
conductivity as the the material is set at a temperature in the cycle,
does anyone know how to do this?

Many thanks!

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Abaqus 6.11 optimization module

Dear All

 I wanna to start the working with abaqus 6.11 optimization module ...

who has been worked with that ?

 ...

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Pre-filled Syringe Failure Analysis using Abaqus/Standard

Failure of pharmaceutical packaging incurs the risk of negative health outcomes and expensive product recalls. Pre-filled syringes represent a growing portion of the drug packaging market. During its working life, a syringe ex-periences stresses that may result in material damage. Specifically, the syringe barrel may develop microcracks that coalesce and propagate, causing the syringe to frac-ture and its contents to lose sterility. Abaqus/Standard offers the technologies necessary to include fracture and failure in the syringe design process.

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Optimization in the Vibro-Acoustic Design of Hearing Instruments

In the design of hearing instruments it is important to achieve the highest possible gain without introducing feedback between the microphone and loudspeaker. With more gain, a larger hearing loss can be accommodated and a greater number of users benefit.
Maximizing gain while minimizing the possibility of feed-back requires an optimal choice of design parameters. In this Technology Brief, we outline how Abaqus/Standard and Isight can be combined in a process to optimize the vibro-acoustic characteristics of hearing instruments.

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Modeling Biodegradable Polymeric Stents Using Abaqus/Standard

Biodegradable polymeric stents must provide mechanical support of the stenotic artery wall for up to several months while being subjected to cyclic loading that af-fects the degradation process. To understand the appli-cability and efficacy of biodegradable polymers, a hypere-lastic constitutive model is developed for materials under-going deformation-induced degradation. The model was implemented in Abaqus/Standard and applied to a com-monly used biodegradable polymer system, poly (L-lactic acid) (PLLA).

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Simulation of Adaptive Bone Remodeling with Abaqus/Standard

In the adaptive bone remodeling process, the density of bone tissue changes over time according to the load it sustains. Elevated loads produce increases in bone den-sity while reduced loads cause reduction of bone density. The long term success of an orthopedic implant can be better predicted by including this process in the design workflow. In this Technology Brief, we demonstrate the Abaqus/Standard implementation of one of the leading bone re-modeling algorithms.

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Simulation of Electroencephalography (EEG) Using Abaqus

Electroencephalography (EEG) is used to obtain informa-tion about the electrical activity in the brain and is rou-tinely used to diagnose neurological abnormalities. The inverse problem in EEG refers to the procedure of locat-ing electrical sources in the brain from the extracranial electrical field measured on the scalp. The solution of the inverse problem requires the forward calculation of the electric field for a given source location.

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Material Model Calibration Using Abaqus and HEEDS

The ability of a finite element simulation to accurately capture the behavior of a structure strongly depends on the chosen material model. Not only must it be applica-ble to the given class of materials and intended applica-tion, it must be properly calibrated. Sophisticated material models that use many parameters can present a challenging calibration task. Optimization techniques can be employed to determine suitable pa-rameter values.

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Simulation of Implantable Nitinol Stents

The superelastic, shape memory, biocompatibility, and fatigue properties of Nitinol, a nickel-titanium alloy, have made the material attractive for medical devices such as cardiovascular stents. However, it is a complex material and difficult to process. Finite element modeling of Nitinol devices such as stents reduces testing and time-to-market by allowing the designer to simulate the stent manufacturing and deployment processes. The constitu-tive models for superelastic alloys are available as user subroutine libraries for both Abaqus/Standard and Abaqus/Explicit.

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Nonlinear Micro Finite Element Analysis of Human Trabecular Bone

Trabecular bone must withstand the loads that arise during daily activities as well as those due to trauma. Investigation of the mechanical properties of trabecular bone presents a challenge due to its high porosity and complex architecture, both of which vary substantially between anatomic sites and across individuals. While Micro Finite Element (μFE) analysis of trabecular bone is the most commonly used method to analyze trabecular bone mechanical behavior, the large size of these models has forced researchers to use custom codes and linear analysis.

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Welding Simulation with Abaqus

Metal welding processes are employed in various indus-tries. Gas welding techniques use the heat from a flame to melt the parts to be joined and a filler material simulta-neously. Extreme thermal loading is applied to the parts being joined, and complex material responses are initi-ated. The steep, localized thermal gradients result in stress concentrations in the welding zone. Consequently, modeling and simulation of welding processes are often complex and challenging.

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Filament Wound Composite Pressure Vessel Analysis with Abaqus

Filament winding has become a popular construction technique in a wide variety of industries for creating com-posite structures with high stiffness-to-weight ratios. The difficulty in accurately analyzing the structural behavior of a filament wound body derives from the continually vary-ing orientation of the filaments. The standard capabilities of commercial finite element codes are inadequate to model the spatial variation of fiber orientation in a practical way.

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Fracture Mechanics Study of a Compact Tension Specimen Using Abaqus/CAE

Abaqus/CAE includes modeling and postprocessing capabilities for fracture mechanics analyses. These features provide interactive access to the contour integral fracture mechanics technology in Abaqus/Standard. Several fracture-specific tools are available, such as those for creating seam cracks, defining singularities, selecting the crack front and crack tip, defining q-vectors or normals to the crack front, and creating focused meshes. With these tools models can be created to estimate J-integrals, stress intensity factors, and crack propagation directions.

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Low-cycle Thermal Fatigue of a Surface-mount Electronics Assembly

The solder joints of surface-mount electronic devices may fail because of low-cycle fatigue. Combined with differences in thermal expansion properties for the various components of the assembly, cyclic thermal loading induces stress reversals and the potential accumulation of inelastic strain in the joints. Predicting solder joint fatigue life requires a thorough understanding of the deformation and failure mechanisms of the solder alloy and an accurate

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Creep Analysis of Lead-Free Solders Undergoing Thermal Loading

Lead and its compounds have been widely used for many years in the electronics industry. However, the global demand to reduce the use of hazardous materials has compelled electronics manufacturers to consider the use of lead-free materials in future products. This transition has heightened the necessity for new finite element material models that can be used to evaluate the reliability of lead-free solders.

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Electro-Mechanical Analysis of MEMS Devices with CoventorWare and Abaqus

The computational analysis of MEMS (Micro Electro Me-chanical systems) devices poses distinctive challenges, requiring software that provides flexible modeling tools, enables the coupling of multiple physical phenomena, and considers the integration of the devices into their macro-scale surroundings. To meet these requirements, Abaqus partners with developers of commercially available MEMS software by providing the necessary finite element analy-sis capabilities to these packages.

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Drop Test Simulation of a Cordless Mouse

Portable, hand-held electronic devices have become commonplace due to their small size and light weight. It is inevitable that such devices will occasionally experience the shock loading associated with being dropped. Ac-counting for this loading scenario in the design process, both analytically and experimentally, allows for the devel-opment of more durable products. The ability to simulate drop-type loading reliably reduces the dependency on experimental testing.

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Modeling the Interaction of Subsea Pipelines with the Seabed

The interaction of a subsea pipeline with the seabed is a complex phenomenon. Operational  loads can cause a subsea pipeline to buckle or “walk” over the seabed, leading to very high pipeline stresses. In some cases however, the buckling phenomena can be beneficially used to
relieve excessive stresses by allowing the pipeline to deform at pre-determined locations. The understanding and prediction of these phenomena is therefore crucial for subsea pipeline design.

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Helical Buckling of Coiled Tubing in Directional Oil Wellbores

Coiled tubing is used in a variety of oil well operations including drilling, completions, and  remedial activities. For each of these applications coiled tubing offers the benefits of reduced costs, speed, and reduced environmental impact. Coiled tubing possesses a limitation  however, in that it may buckle in service. In this situation the tubing may be damaged, and operations may be delayed or disrupted. In this Technology Brief, we provide a methodology for evaluating the buckling behavior of coiled wellbore tube.

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Coupled Thermal-Structural Analysis of the Shippingport Nuclear Reactor Using Adaptive Remeshing in Abaqus/CAE

Mesh construction is a key consideration in the course of building a finite element model. The quality of the analysis results depends on the quality of the mesh; arriving at an acceptable solution requires judicious meshing choices. Specifically, the analyst must consider the type of ele-ments and the density of the mesh, which is often varied throughout the model, with more refinement in critical re-gions. These considerations need to be balanced against the desire to minimize analysis cost in terms of preproc-essing effort, analysis run time, and computer resources.

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Earth Penetration Simulation using Coupled Eulerian-Lagrangian Analysis

In earth penetration events the projectile generally strikes the target at an oblique angle. As a result, the projectile is subjected to a multi-axial force and acceleration history through impact. The effectiveness of an earth penetration system is enhanced by the ability to withstand severe

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Dynamic Design Analysis Method (DDAM) Response Spectrum Analysis with Abaqus

The Dynamic Design Analysis Method (DDAM) is a U.S. Navy methodology for qualifying shipboard equipment and supporting structures for survival of shock loading due to
underwater explosions (UNDEX). The DDAM is a regimented collection of procedures that utilize estimates of the peak linear dynamic response of ship equipment and structures

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