The Elastic-Plastic Finite Element Alternating Method (EPFEAM) and the prediction of fracture under WFD conditions in aircraft structures

Wang, L.; Brust, F. W.; Atluri, Satya N.

doi:10.1007/s004660050240

Cited by 16 publications

(3 citation statements)

References 34 publications

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“…The finite element alternating method (FEAM) is a convenient numerical method for obtaining stress intensity factor solutions for complex engineering structures [8][9]. The major advantage of this method is that only a finite element mesh of the un-cracked geometry is needed to obtain the stress intensity factors.…”

Section: Stress Intensity Factor Solutions Feam Proceduresmentioning

confidence: 99%

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Crack Growth Behavior in a Residual Stress Field for Vessel Type Structures

Dong

Rawls

2003

Residual Stress, Fitness-for-Service, and Manufacturing Processes

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Detailed residual stress analysis was performed for a multi-pass butt weld, representing the middle butt-girth weld of a storage tank. The analysis procedures took into account representative welding parameters, joint detail, weld pass deposition sequence, as well as temperature-dependent properties. The predicted residual stresses were then considered in stress intensity factor calculations using a three-dimensional finite element alternating model (FEAM) for investigating crack growth behavior for both small elliptical surface and through-wall cracks.Two crack orientations were considered: one is parallel to the vessel seam weld and the other is perpendicular to the seam weld. Since the longitudinal (parallel to weld) and transverse (perpendicular to weld) residual stresses exhibit drastically different distributions, a different crack growth behavior is predicted. For a small surface crack parallel to the weld, the crack tend to grow more quickly at the surface along the weld rather than into the thickness after some initial growth. The self-equilibrating nature of the transverse residual stress distribution suggests that a through-wall crack parallel to crack cannot be fully developed solely due to residual stress actions. For a crack that is perpendicular to the weld, a small surface crack exhibit a rapid increase in K at the deepest position, suggesting that a small surface crack has the propensity to become a through-wall crack. Once the through crack is fully developed, a significant redistribution in longitudinal residual stress can be seen. As a result, there exists a limit crack length beyond which further crack growth is deemed unlikely, if there is no external loading.

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Section: Stress Intensity Factor Solutions Feam Proceduresmentioning

confidence: 99%

“…Stress intensity factors are then performed using a finite element alternating method (FEAM), as discussed in [7][8][9], by directly considering the weld residual stress distributions and quasi-static crack growth.…”

Section: Introductionmentioning

confidence: 99%

Crack Growth Behavior in a Residual Stress Field for Vessel Type Structures

Dong

Rawls

2003

Residual Stress, Fitness-for-Service, and Manufacturing Processes

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“…instance Reference [37]) was used to calculate the stress intensity factors for the different crack sizes considered. FEAM is quite convenient for this application since stress intensity factors are readily evaluated using the mesh of Figure 10 directly, i.e.…”

Section: Storage Tank Weldsmentioning

confidence: 99%

An investigation of the effects of history dependent damage in time dependent fracture mechanics: nano-scale studies of damage evolution

Brust¹,

Mohan²,

Yang³

et al. 2002

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DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their cmployt#. makes my warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or proccts ditcloscd, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, ptoccss, or service by trade name, trademark, manufacturer. or otherwise does not necessarily constitute or imply its endorsement. mommendation, or favoring by the United States Govtrnment or any agency t h m f .The views and opinions of authors expressed herein do not necessarily state or reflect thwe of the United States Government or any agency thereof. DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. AN INVESTIGATION OF THE EFFECTS OF HISTORY DEPENDENT DAMAGE IN TIME DEPENDENT FRACTURE MECHANICS: Nano-scale Studies of Damage Evolution To Department of Energy Office of Basic Energy Sciences HIGH LEVEL RESEARCH PURPOSEHigh temperature operation of technical engineering systems is critical for system eficiency and will be a key driver in the future US energy policy. Most systems, from new power generation schemes, innovative and/or new chemical processes, vehicle propulsion, etc., operate efficiently and reduce environmental hazards only when operated at very high temperatures. Often potential processes must be abandoned because the high temperature management costs prohibit marketplace development. Some of the newer chemical production systems, which are based on micro-or nano-tech processes, must operate at very high temperatures otherwise the competitive advantage compared with traditional developments cannot be realized. These new micro-tech systems are the basis for advanced fuel cells and efficient heat exchangers. President Bush's aggressive new energy policy includes an important emphasis on advanced nuclear power systems. The new generation concepts for nuclear plants rely heavily on the need for very high temperature operation -much higher than current PWR and/or BWR nuclear plants used today.Next generation aerospace vehicles will be propelled by systems that rely on very high temperature operation. Indeed, future materials for high temperature application may come from building the materials at the nanometer size scale.Unfortunately, in this age where terrorists may strike the United States on our home soil, high temperature performance of structural systems, which experience severe damage from hostile enemies, is a new important concern. It is now known that the world trade center buildings fell after the terrorist attack when high temperature creep damage and buckling of structural members on the higher floors led to a progressive failure of the buildings rather quickly. Other vulnerable oper...

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Probabilistic analysis of multi-site damage in aircraft fuselages

Proppe¹

2003

Computational Mechanics

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Most aircraft fleets nowadays are operating under the concept of damage tolerance, which requires an aircraft to have sufficient residual strength in the presence of damage in one of its principal structural elements (PSE) during the interval of service inspections. The residual strength however is significantly reduced due to multi site damage (MSD). In the present paper, a probabilistic framework for the computation of the failure probability is developed. The MSD problem of a PSE is considered, where the uncertainties in crack initiation and crack growth as well as yield stress and fracture toughness are described by random variables. For the crack growth calculations the finite element alternating method [1], which avoids a remeshing of the finite element problem, is used. After specifying link up and failure criteria, importance sampling is employed to obtain the probability of failure of the PSE due to MSD.

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The Elastic-Plastic Finite Element Alternating Method (EPFEAM) and the prediction of fracture under WFD conditions in aircraft structures

Cited by 16 publications

References 34 publications

Crack Growth Behavior in a Residual Stress Field for Vessel Type Structures

Crack Growth Behavior in a Residual Stress Field for Vessel Type Structures

An investigation of the effects of history dependent damage in time dependent fracture mechanics: nano-scale studies of damage evolution

Probabilistic analysis of multi-site damage in aircraft fuselages

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