Modeling void coalescence during ductile fracture of a steel

Bandstra, J.P.; Koss, D. A.; Geltmacher, Andrew B.; Matic, Peter; Everett, R.K.

doi:10.1016/j.msea.2003.08.018

Cited by 81 publications

(46 citation statements)

References 22 publications

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“…Meanwhile, the mechanism of ductile failure is well developed. Three parts of the mechanism are void nucleation, growth, and coalescence to form a crack, ending with fracture [15,16]. The ductile fracture of material consists of void nucleation and growth, which are governed by the motion of dislocations.…”

Section: Introductionmentioning

confidence: 99%

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Gong

et al. 2017

Metals

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Eighty percent heavy cold thickness reduction and reversion transformation in the temperature range 700-950 • C for 60 s were performed to obtain the reverted ultrafine-grained (UFG) structure in 304 austenitic stainless steel. Through mechanical property experiments and transmission electron microscopy (TEM) of micro deformation of the UFG austenite structure, the tensile fractographs showed that for specimens annealed at 700-950 • C, the most frequent dimple sizes were approximately 0.1-0.3 µm and 1-1.5 µm. With the increase in annealing temperature, the dimple size distribution of nano-sized grains turned to micron-size. TEM micro deformation experiments showed that specimens annealed at 700 • C tended to crack quickly. In the grain annealed at 870 • C, partial dislocations were irregularly separated in the crystal or piled up normal to the grain boundaries; stacking faults were blocked by grain boundaries of small grains; twins held back the glide of the dislocations. In the grain annealed at 950 • C, the deformation twins were perpendicular to ε martensite. Fine grain was considered a strengthening phase in the UFG structure and difficult to break.

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Section: Introductionmentioning

confidence: 99%

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Gong

et al. 2017

Metals

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“…Because it was shown that the ductile fracture of HY-100 steel occurs by a void sheet mechanism influenced by the clustering of MnS inclusions, NRL employed image-based models to examine the deformation localization behaviour within void arrays based on experimentally measured inclusion microstructures [54]. Treating the elongated voids as through thickness holes in arrays of over 100 holes determined from standard micrographs in two-dimensional models of flow localization, critical features such as void size, shape, spacing and clustering have been evaluated.…”

Section: (A) Microdamage Evolution In Ductile Fracturementioning

confidence: 99%

“…-Computational modelling of fracture and fatigue using statistical techniques will address outlier phenomena, operating from atomistic to bulk scales and governed by fundamental fracture and fatigue mechanisms. This will build on the recent statistical methods used to design materials for stiffness and strength based on processingmicrostructure-property linkages in material knowledge systems [54].…”

Section: Future Challenges and Trendsmentioning

confidence: 99%

Computational aspects of steel fracturing pertinent to naval requirements

Matic

Geltmacher

Rath

2015

Phil. Trans. R. Soc. A.

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Modern high strength and ductile steels are a key element of US Navy ship structural technology. The development of these alloys spurred the development of modern structural integrity analysis methods over the past 70 years. Strength and ductility provided the designers and builders of navy surface ships and submarines with the opportunity to reduce ship structural weight, increase hull stiffness, increase damage resistance, improve construction practices and reduce maintenance costs. This paper reviews how analytical and computational tools, driving simulation methods and experimental techniques, were developed to provide ongoing insights into the material, damage and fracture characteristics of these alloys. The need to understand alloy fracture mechanics provided unique motivations to measure and model performance from structural to microstructural scales. This was done while accounting for the highly nonlinear behaviours of both materials and underlying fracture processes. Theoretical methods, data acquisition strategies, computational simulation and scientific imaging were applied to increasingly smaller scales and complex materials phenomena under deformation. Knowledge gained about fracture resistance was used to meet minimum fracture initiation, crack growth and crack arrest characteristics as part of overall structural integrity considerations.

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“…Thus, the interfaces between different phases play an important role in the total strength and fracture toughness of LDCM (Bandstra et al, 2004;Dierickx et al, 1997;Lee et al, 2005;Yuan and Misra, 2006). For this purpose, see Fig.…”

Section: Fig 22mentioning

confidence: 99%

Microstructure-Based Computational Modeling of Mechanical Behavior of Polymer Micro/Nano Composites

Tehrani¹

2013

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Lightweight advanced materials are critical in the manufacturing of many Army vehicles. Recently, numerical tools have been utilized to customize experiments to achieve optimized behavior of micro/nano polymer composites (MNPCs). Most numerical studies are based on characterizing the MNPCs through simple microstructures, as circular particles or straight fibers embedded in a specific polymer matrix. Although these geometries are effective in virtually modeling some types of composite material behavior, they fail to address some critical key Names of Under Graduate students supportedPERCENT_SUPPORTED NAME FTE Equivalent:Total Number:The number of undergraduates funded by this agreement who graduated during this period with a degree in science, mathematics, engineering, or technology fields:The number of undergraduates funded by your agreement who graduated during this period and will continue to pursue a graduate or Ph.D. degree in science, mathematics, engineering, or technology fields:Number of graduating undergraduates who achieved a 3.5 GPA to 4.0 (4.0 max scale): Number of graduating undergraduates funded by a DoD funded Center of Excellence grant for Education, Research and Engineering:The number of undergraduates funded by your agreement who graduated during this period and intend to work for the Department of DefenseThe number of undergraduates funded by your agreement who graduated during this period and will receive scholarships or fellowships for further studies in science, mathematics, engineering or technology fields: Student Metrics This section only applies to graduating undergraduates supported by this agreement in this reporting periodThe number of undergraduates funded by this agreement who graduated during this period: 0.00 ...... Names of Personnel receiving masters degrees Inventions (DD882) Scientific ProgressBecause the mechanical responses of polymers and many types of polymer composites are in the large deformation range, the Eulerian or Lagrangian concept is required for measuring the stress and strain. On the other hand, developing a large deformation based constitutive model requires a number of considerations, and should be performed from a thermodynamics point of view to study the motion of each component of the material. Even though such approach is precise and physically sound, it is limited to just one type of material. Furthermore, polymers show high dependency to the rate and time of the applied load; hence, employing viscoelastic, viscoplastic and viscodamage models is necessary. To address these issues, a consistent framework is developed to generalize elastic/viscoelastic and plastic/viscoplastic models from small strain to the large deformation range. The developed continuum based app...

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Modeling void coalescence during ductile fracture of a steel

Cited by 81 publications

References 22 publications

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Computational aspects of steel fracturing pertinent to naval requirements

Microstructure-Based Computational Modeling of Mechanical Behavior of Polymer Micro/Nano Composites

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