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Papers by Anuwedita Singh

Fatigue & Fracture of Engineering Materials & Structures

In this investigation, three subjects are considered. First, the effect of the human factor is ex... more In this investigation, three subjects are considered. First, the effect of the human factor is examined. In carrying out analyses of fatigue delamination propagation tests on laminate composites, the delamination length must be measured. The human effect on measurement of the delamination length by different investigators is discussed. A limited influence of the human factor on the measurement of the delamination length , as well as on delamination propagation rate , is observed in this study. Secondly, the paper proceeds to discuss the influence of the ratio on the fatigue delamination growth rate. It is found that a higher rate of crack/delamination propagation is associated with lower ratios which appears to contradict conventional wisdom. This behavior is confirmed in tests. Thirdly, a comparison between the fatigue propagation rates of two material systems is considered. It is concluded that the energy release rate used to assess these materials should not be normalized.

Encyclopedia of Continuum Mechanics, 2020

Lagrangian systems with a finite number of degrees of freedom Definition Systems with a finite nu... more Lagrangian systems with a finite number of degrees of freedom Definition Systems with a finite number of degrees of freedom and whose response to actions exerted by the external world is modeled by means of a Lagrangian function Variable-Kinematics, Meshless Analysis of Composite Beams

Encyclopedia of Continuum Mechanics, 2019

Journal of Mechanics, 2020

ABSTRACTThe problem of semi-infinite crack situated in an orthotropic strip sandwiched between tw... more ABSTRACTThe problem of semi-infinite crack situated in an orthotropic strip sandwiched between two identical half planes has been considered. The considered boundary value problem has been solved to convert it into the standard Wiener-Hopf equation by using Fourier transform technique, which has been solved to obtain analytical expressions for stress intensity factor and crack opening displacement. The variations of stress intensity factors and crack opening displacement are displayed graphically for different pair of orthortropic materials and for various depth of the strip of the composite media.

Composites Part B: Engineering, 2018

The purpose of this article is to determine the thermal stress intensity factor (SIF) of an edge ... more The purpose of this article is to determine the thermal stress intensity factor (SIF) of an edge crack situated in an orthotropic strip of finite thickness h bonded to an orthotropic half plane, under thermal and mechanical loadings. The problem is reduced to a singular integral equation of the first kind. The integral equation is converted to a pair of the singular integral equations using asymptotic expansion method. The analytical expression of the stress intensity factor at the edge crack tip is found for concentrated point loading. The numerical values of SIF are computed for different point loading for various crack lengths and different ratios of thermal conductivities for different particular cases when the composite orthotropic material is the mixture of Steel-Myler and E-Glass epoxy. The significant feature of the article is the pictorial presentations of the variations of SIF due to the effect of ratios of thermal conductivities of both the materials.

Mechanics of Composite Materials, 2019

The purpose of this article is to determine the effect of thermal loadings on the stress intensit... more The purpose of this article is to determine the effect of thermal loadings on the stress intensity factor of an edge crack of finite length in an orthotropic infinite strip of finite thickness under mechanical loading. Analytical expressions of the stress intensity factor at the crack tip in point and arbitrary constant loadings are found. Numerical values of the factor at any arbitrary location on the crack face due to mechanical loading and effects of thermal loadings are computed for various crack lengths in an orthotropic material composite, and the results are presented in the form of graphs. The effects of thermal conductivity parameters on the stress intensity factor for different particular cases are also shown graphically.

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2018

The present article deals with the investigation of elasto-dynamic response of a finite crack und... more The present article deals with the investigation of elasto-dynamic response of a finite crack under normal and shear impact loading situated at the interface of two semiinfinite orthotropic strips. Laplace and Fourier Integral transforms are employed to reduce the transient problem to the solution of a pair of dual integral equations in the Laplace transform plane which are solved using iterations in the low frequency domain. The analytical expressions of stress intensity factors of the crack at the interface problem are found. To determine time dependence of the parameters, these equations are inverted to yield the dynamic stress intensity factors for some fiber-reinforced orthotropic composite materials using Bellman method and the method given by H. Dubner and J. Abate. The results are depicted through graphs for different particular cases.

Fatigue & Fracture of Engineering Materials & Structures

In this investigation, three subjects are considered. First, the effect of the human factor is ex... more In this investigation, three subjects are considered. First, the effect of the human factor is examined. In carrying out analyses of fatigue delamination propagation tests on laminate composites, the delamination length must be measured. The human effect on measurement of the delamination length by different investigators is discussed. A limited influence of the human factor on the measurement of the delamination length , as well as on delamination propagation rate , is observed in this study. Secondly, the paper proceeds to discuss the influence of the ratio on the fatigue delamination growth rate. It is found that a higher rate of crack/delamination propagation is associated with lower ratios which appears to contradict conventional wisdom. This behavior is confirmed in tests. Thirdly, a comparison between the fatigue propagation rates of two material systems is considered. It is concluded that the energy release rate used to assess these materials should not be normalized.

Encyclopedia of Continuum Mechanics, 2020

Lagrangian systems with a finite number of degrees of freedom Definition Systems with a finite nu... more Lagrangian systems with a finite number of degrees of freedom Definition Systems with a finite number of degrees of freedom and whose response to actions exerted by the external world is modeled by means of a Lagrangian function Variable-Kinematics, Meshless Analysis of Composite Beams

Encyclopedia of Continuum Mechanics, 2019

Journal of Mechanics, 2020

ABSTRACTThe problem of semi-infinite crack situated in an orthotropic strip sandwiched between tw... more ABSTRACTThe problem of semi-infinite crack situated in an orthotropic strip sandwiched between two identical half planes has been considered. The considered boundary value problem has been solved to convert it into the standard Wiener-Hopf equation by using Fourier transform technique, which has been solved to obtain analytical expressions for stress intensity factor and crack opening displacement. The variations of stress intensity factors and crack opening displacement are displayed graphically for different pair of orthortropic materials and for various depth of the strip of the composite media.

Composites Part B: Engineering, 2018

The purpose of this article is to determine the thermal stress intensity factor (SIF) of an edge ... more The purpose of this article is to determine the thermal stress intensity factor (SIF) of an edge crack situated in an orthotropic strip of finite thickness h bonded to an orthotropic half plane, under thermal and mechanical loadings. The problem is reduced to a singular integral equation of the first kind. The integral equation is converted to a pair of the singular integral equations using asymptotic expansion method. The analytical expression of the stress intensity factor at the edge crack tip is found for concentrated point loading. The numerical values of SIF are computed for different point loading for various crack lengths and different ratios of thermal conductivities for different particular cases when the composite orthotropic material is the mixture of Steel-Myler and E-Glass epoxy. The significant feature of the article is the pictorial presentations of the variations of SIF due to the effect of ratios of thermal conductivities of both the materials.

Mechanics of Composite Materials, 2019

The purpose of this article is to determine the effect of thermal loadings on the stress intensit... more The purpose of this article is to determine the effect of thermal loadings on the stress intensity factor of an edge crack of finite length in an orthotropic infinite strip of finite thickness under mechanical loading. Analytical expressions of the stress intensity factor at the crack tip in point and arbitrary constant loadings are found. Numerical values of the factor at any arbitrary location on the crack face due to mechanical loading and effects of thermal loadings are computed for various crack lengths in an orthotropic material composite, and the results are presented in the form of graphs. The effects of thermal conductivity parameters on the stress intensity factor for different particular cases are also shown graphically.

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2018

The present article deals with the investigation of elasto-dynamic response of a finite crack und... more The present article deals with the investigation of elasto-dynamic response of a finite crack under normal and shear impact loading situated at the interface of two semiinfinite orthotropic strips. Laplace and Fourier Integral transforms are employed to reduce the transient problem to the solution of a pair of dual integral equations in the Laplace transform plane which are solved using iterations in the low frequency domain. The analytical expressions of stress intensity factors of the crack at the interface problem are found. To determine time dependence of the parameters, these equations are inverted to yield the dynamic stress intensity factors for some fiber-reinforced orthotropic composite materials using Bellman method and the method given by H. Dubner and J. Abate. The results are depicted through graphs for different particular cases.