Computational Fracture Mechanics

Anderson, TL

doi:10.1201/9781315370293-16

Cited by 30 publications

(48 citation statements)

References 1 publication

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“…On one hand side, it was relatively simple model for brittle fracture, ie, cleavage, whereas more complex mechanisms of ductile fracture were modelled as a process of void nucleation, growth, and coalescence, which is the focus here. In this chapter, numerical methods, used for simulation of ductile fracture process, are presented as a compilation of previously accomplished research, followed by an overview of more recent results …”

Section: Micromechanical Modelling—local Approach To Fracturementioning

confidence: 99%

Computational fracture mechanics: An overview from early efforts to recent achievements

Sedmak

2018

Fatigue Fract Eng Mat Struct

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An overview of the state of the art of computational fracture mechanics is presented, starting from early efforts and going all the way up to recent achievements. Some specific aspects of linear elastic and elastic plastic fracture mechanics problems have been discussed, including the fact that even for a static loading, numerical simulation is not a simple task because of complex geometries, material nonlinearity, and heterogeneity, and especially if crack growth is considered. Therefore, micromechanical modelling of elastic‐plastic crack growth is presented as new and promising approach to overcome some of the shortages of traditional approach. Besides static loading, couple of other important practical problems are tackled, like fatigue crack growth, with remaining life in the focus of investigation, using the empirical laws for crack growth rates. Numerical simulation of fatigue crack growth is inherently complex both because of complex material damage processes and lack of sound theoretical basis to define them. Therefore, combination of theoretical, experimental, and numerical approach is presented here to get reliable and efficient estimation of life under fatigue loading.

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Section: Micromechanical Modelling—local Approach To Fracturementioning

confidence: 99%

Computational fracture mechanics: An overview from early efforts to recent achievements

Sedmak

2018

Fatigue Fract Eng Mat Struct

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“…In addition, at the slow burrowing speeds of those three individuals, plastic deformation is more likely than fracture. Fracture results when stored elastic energy exceeds the fracture toughness of the material; this energy is transferred to the creation of new surface area, or crack growth (Anderson ). Slower deformations allow more time for stored elastic energy to be dissipated through frictional dissipation, plastic rearrangement of aggregates of grains, or dewatering of sediments.…”

Section: Discussionmentioning

confidence: 99%

Strategies of burrowing in soft muddy sediments by diverse polychaetes

Dorgan

D’Amelio

Lindsay

2016

Invertebrate Biology

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Muddy sediments are elastic solids through which morphologically diverse animals extend burrows by fracture. Muddy sediments inhabited by burrowing infauna vary considerably in mechanical properties, however, and at high enough porosities, muds can be fluidized. In this study, we examined burrowing behaviors and mechanisms of burrow extension for three morphologically diverse polychaete species inhabiting soft muddy sediments. Worms burrowed in gelatin, a transparent analog for muddy sediments, and in natural sediments in a novel viewing box enabling visualization of behaviors and sediment responses. Individuals of Scalibregma inflatum and Sternaspis scutata can extend burrows by fracture, but both also extended burrows by plastic deformation and by combinations of fracture and plastic deformation. Mechanical responses of sediments corresponded to different burrowing behaviors in Scalibregma; direct peristalsis was used to extend burrows by fracture or a combination of plastic deformation and fracture, whereas a retrograde expansive peristaltic wave extended burrows by plastic deformation. Burrowing speeds differed between behaviors and sediment mechanical responses, with slower burrowing associated with plastic deformation. Sternaspis exhibited less variability in behavior and burrowing speed but did extend burrows by different mechanisms consistent with observations of Scalibregma. Individuals of Ophelina acuminata did not extend burrows by fracture; rather individuals plastically deformed sediments similarly to individuals of the related Armandia brevis. Our results extend the range of natural sediments in which burrowing by fracture has been observed, but the dependence of burrow extension mechanism on species, burrowing behavior, and burrowing speed highlights the need for better understanding of mechanical responses of sediments to burrowers.Additional key words: fracture, locomotion, behavior, animal-sediment interactions, annelids Invertebrate Biology 135(4): 287-301.

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“…In the study, concrete is the material of matter -concrete is a classified as a brittle material although it does allow severe plasticity [11]. To be more detail from modern fracture mechanics perspective, concrete is considered as a quasi-brittle material as it does have some dissimilarity to ideal brittle material [12]. Hereby, the motivation of the study will be shifted to concentrate on linear-elastic fracture mechanics by obeying its law.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Later in year 1921 by an English aeronautical engineer, Alan Arnold Griffith of the Royal Aircraft Establishment in the United Kingdom with the lead of the mathematical work of Professor Sir Charles Edward Inglis. He became fascinated in effect of scratches and surface finish on metals subjected to fatigue loading [12]. Then, Dr. George Rankin Irwin, an American expert in fracture mechanics and materials [43] extended Griffith's approach by refining the definition of energy release within the plastic zone [44] [12]).…”

Section: Research Progress In Fatigue and Fracture In Concretementioning

confidence: 99%

“…He became fascinated in effect of scratches and surface finish on metals subjected to fatigue loading [12]. Then, Dr. George Rankin Irwin, an American expert in fracture mechanics and materials [43] extended Griffith's approach by refining the definition of energy release within the plastic zone [44] [12]). Nextly, Professor Harold Malcolm Westergaard went deep into studying bearing effect and cracks, and eventually explored the theory of elasticity and plasticity [45].…”

Section: Research Progress In Fatigue and Fracture In Concretementioning

confidence: 99%

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A review on the application of the theory of critical distance towards concrete

et al. 2018

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Theory of Critical Distance (TCD) is one of Fracture Mechanics numerical model that has gone through tremendous laboratory works and validation. Hence, it has been proven to be precise in broad perspectives in the field. Recently, TCD research related to fracture, especially fatigue on concrete are growing but the depth of study is still shallow and deficient compared to metal and steel. Thus, this made the fracture assessment in concrete obscures and governs by uncertainties. Previous efforts have managed to optimize TCD but the results only valid if the water-cement ratio of a concrete specimen in its optimum level. When the water-cement ratio is adjusted to a higher or lower from its optimum level, the output errors showed inconsistency as reported by Luca Susmel (2016). Therefore, this research aims to optimize the Theory of Critical Distance (TCD) by incorporating water-cement ratio and the interaction of microstructure matrix. The optimization involves few stages and finite element. If Theory of Critical Distance (TCD) can be improved by considering concrete’s additional element in its mathematical expression, it will definitely contribute to betterment in assessing concrete infrastructure around the globe.

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Computational Fracture Mechanics

Cited by 30 publications

References 1 publication

Computational fracture mechanics: An overview from early efforts to recent achievements

Computational fracture mechanics: An overview from early efforts to recent achievements

Strategies of burrowing in soft muddy sediments by diverse polychaetes

A review on the application of the theory of critical distance towards concrete

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