Stress Intensity Factor for an Elliptic Inclusion in Orthotropic Laminates Subjected to Freeze-thaw: Model Verification

Roy, Samit; Nie, G.H.; Karedla, Ravi Shankar; Dharani, Lokeswarappa R.

doi:10.1177/096739110201000801

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…It was found that the calculated mixed-mode stress intensity factors of the free-edge delamination crack remain relatively constant as the crack propagates into the laminate. The stress intensity factor K I resulting from water-ice inclusion in both transversely isotropic and orthotropic matrices was analytically obtained by Roy et al (2002). It was found that stress field in the vicinity of an elliptic inclusion was an acceptable analytical idealization to obtain the stress intensity for a crack with ice inclusion.…”

Section: Damage Of Composite Structuresmentioning

confidence: 99%

Overview of Structural Life Assessment and Reliability, Part I: Basic Ingredients of Fracture Mechanics

Ibrahim¹

2015

j ship prod des

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Structural life assessment periodically evaluates the state and condition of a structural system and provides recommendations for possible maintenance actions or the end of structural service life. It is a diversified field and relies on the theories of fracture mechanics, fatigue damage process, probability of failure, and reliability. With reference to naval ship structures, their life assessment is not only governed by the theory of fracture mechanics and fatigue damage process, but by other factors such as corrosion, grounding, and sudden collision. The purpose of this series of review articles is to provide different issues pertaining to structural life assessment of ships and ocean structures. Part I deals with the basic ingredients of the theory of fracture mechanics, which is classified into linear elastic fracture mechanics and elasto-plastic fracture mechanics. The amount of energy available for fracture is usually governed by the stress field around the crack, which is measured by the stress intensity factor. The value of the stress intensity factor, which depends on the loading mode, is evaluated by different methods developed by many researchers. The applications of the theory of fracture mechanics to metallic and composite structures are presented with an emphasis to those used in marine structures. When the inertia of relatively large pieces of a structure is large enough that the correct balancing of the energy of fracture requires the inclusion of kinetic energy, then the dynamic nature of fracture dominates the analysis. For a crack that is already propagating, the inertial effects are important when the crack tip speed is small compared with the stress wave velocities. This fact has been realized in the theory of fracture mechanics under the name of dynamic fracture and peridynamic. In essence, peridynamic replaces the partial differential equations of classic continuum theories with integro-differential equations as a tool to avoid singularities arising from the fact that partial derivatives do not exist on crack surfaces and other singularities. A brief overview of fracture dynamics and peridynamics together with damage mechanisms in composite structures is presented. The limitations of fracture mechanics criteria are also discussed. Life assessment of ship structures depends on the failure modes and the probabilistic description of failure, which are addressed in Part II. Life assessment of ship structures depends on the failure modes and the probabilistic description of failure. In view of structural parameter uncertainties, probabilistic analysis requires the use of reliability methods for assessing fatigue life by considering the crack propagation process and the first passage problem, which measures the probability of the exit time from a safe operating regime. The main results reported in the literature pertaining to ship structural damage assessments resulting from to slamming loads, liquid sloshing impact loads of liquefied natural gas in ship tankers, and ship grounding accidents, an...

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Section: Damage Of Composite Structuresmentioning

confidence: 99%

Overview of Structural Life Assessment and Reliability, Part I: Basic Ingredients of Fracture Mechanics

Ibrahim¹

2015

j ship prod des

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“…Recently, an analytic model has been developed and applied to predict matrix crack initiation in an orthotropic laminate due to volumetric expansion in an elliptical or rectangular inhomogeneity with the aid of complex function formulation [26][27][28]. However, the two basic complex parameters, which characterize the degree of anisotropy for any ideal orthotropic elastic body, are assumed to be purely imaginary numbers.…”

Section: Introductionmentioning

confidence: 99%

“…Analyses of stress distribution pattern along the interior boundary of the matrix, strength-based failure and fracture behavior are conducted. For very narrow ellipses due to normal eigenstrain, the resulting stress acting along the major axis of the ellipse can be considered as the driving force for the crack, which attributes to strength-based failures, fractures and fatigues of polymer composites under freeze-thaw conditions [27,28].…”

Section: Introductionmentioning

confidence: 99%

“…media due to normal and shear eigenstrains. For the case of inhomogeneity when the two volumetric expansion parameters d 1 > 0 and d 2 > 0, the stress components r 0 y and r 0 y in the inhomogeneity are both compressive stresses and spatially uniform[27]. In particular, tensile stress at the tip of the composite r c y , causes failure, and the component r 0 y Distribution of s c ns for the case of shear eigenstrains.…”

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confidence: 98%

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Elliptical inhomogeneity in orthotropic composite materials due to uniform eigenstrains

Nie

Chan

Shin

et al. 2008

Composites Part B: Engineering

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“…for the case of b a >> . Based on the resulting stress intensity factor, fatigue life can be predicted due to expansion-contraction cycling [4].…”

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confidence: 99%

Crack Driving Force in Anisotropic Media due to Non-Elastic Deformation

Nie

Xu²

2004

KEM

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In this paper elastic stress field in an elliptic inhomogeneity embedded in orthotropic media due to non-elastic deformation is determined by the complex function method and the principle of minimum strain energy. Two complex parameters are expressed in a general form, which covers all characterizations of the degree of anisotropy for any ideal orthotropic elastic body. The stress acting on the long side of ellipse can be considered as a crack driving force and applied in failure and fatigue analysis of composites. For some special cases, the resulting solutions will reduce to the known results.

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Stress Intensity Factor for an Elliptic Inclusion in Orthotropic Laminates Subjected to Freeze-thaw: Model Verification

Cited by 5 publications

References 10 publications

Overview of Structural Life Assessment and Reliability, Part I: Basic Ingredients of Fracture Mechanics

Overview of Structural Life Assessment and Reliability, Part I: Basic Ingredients of Fracture Mechanics

Elliptical inhomogeneity in orthotropic composite materials due to uniform eigenstrains

Crack Driving Force in Anisotropic Media due to Non-Elastic Deformation

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