Strength degradation and stress analysis of composite plates with circular, square and rectangular notches using digital image correlation

Khechai, Abdelhak; Tati, Abdelouahab; Guerira, Belhi; Guettala, Abdelhamid; Mohite, P.M.

doi:10.1016/j.compstruct.2017.11.060

Cited by 85 publications

(40 citation statements)

References 38 publications

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“…8(a). In accordance with the established theory [45], 22 is maximum just ahead of the notch tip at  = 0º. The 22 remains highest at  = 0º for the case of two orthogonal fibre families with initial orientations of 0 º and 90 º (i.e.…”

Section: Effect Of Fiber Orientationsupporting

confidence: 86%

The influence of fibre alignment on the fracture toughness of anisotropic soft tissue

Baranwal

Agnihotri

McGarry

2020

Engineering Fracture Mechanics

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Finite element (FE) simulations are performed to investigate the effect of fiber induced anisotropy on the notch behavior in hyperelastic skin type materials. The modified anisotropic (MA) model is used to define the constitutive behavior in FE simulations through Abaqus user defined material model UMAT. A parametric study is carried out to examine the effect of fiber orientation, notch root radius and sample geometry on the stress field ahead of the notch tip. A non-dimensional parameter  is defined to characterize the combined effect of J energy and average anisotropic energy (aniso)avg on the notch behavior. It is shown that fibre orientation significantly influences the stress state and J-integral at the notch. The findings of the present study will be helpful in determining optimal constitution and orientation of skin grafts at locations of high stress and complex geometries, such as corner of eyes and lips etc.

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Section: Effect Of Fiber Orientationsupporting

confidence: 86%

The influence of fibre alignment on the fracture toughness of anisotropic soft tissue

Baranwal

Agnihotri

McGarry

2020

Engineering Fracture Mechanics

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“…At the first portion of the present work, a set of tensile experiments on laminates with different fiber direction angles and specimens with various notch diameter/width (D/W) ratios are made and tested to define the SCF and damage mechanisms for notched/ un notched samples. Moreover, failure patterns, strain distribution and fracture mechanisms of laminated specimens with rectangular and square holes with rounded corners have been researched [5]. The current research attempts to form composite plates using a blending of natural polymers and fibers to progress certain properties.…”

Section: Methodsmentioning

confidence: 99%

“…Stress distribution around slots can be assessed using computational methods, experimental and elasticity theory stress analysis. Considerable efforts have been formed in the development of precise analytical samples to define the distribution of stress in the segments of the compound [5].…”

Section: Figure1 Structures For Aircraftmentioning

confidence: 99%

Experimental and modeling stress concentration factor (SCF) of a tension poly lactic acid (PLA) plate with two circular holes

Mohan¹,

Habeeb²,

Abood³

2019

PEN

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The design of high performance aircraft structures frequently includes various shape and size discontinuities for various purposes. The zones near to these notches become critical regions under various working loading. The stress concentration factor (SCF) and tensile strength degradation of poly lactic acid (PLA) plates are addressed in the current study through a combination of experimental and numerical studies using finite element (FE) modeling techniques. The present work performs stress concentration factor (SCF) of rectangular plates with two symmetrical circular holes under uniaxial tension load of two various types (PLA, PLA/15%carbon), which were determined in the current work experimentally and numerically using finite element method with help of Ansys software. The results of experimental test showed decay in tensile modulus and tensile strength is less than that of using plates without holes by (10%, 22.1%) for (PLA, PLA/15%carbon) respectively, and the apparent stress concentration factor is (3.33, 3.61) respectively. And showed decay in tensile strength is less than that of using plates without holes by (28.35%, 27.77%) for (PLA, PLA/15%carbon) respectively, due to the concentration of stresses around the holes. A finite element analysis is carried out and the outcomes have been estimated with experimental results for checking the efficient use of this article. The numerical results show the Von Mises stress distribution and stress concentration factor is (2.16, 2.35) for (PLA, PLA/15%carbon) respectively.

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“…1 и 2 видно, что максимальные значения поврежденности достигаются на контуре кругового выреза в случае всесторонне растягиваемой пластины и в точках кругового отверстия, лежащих на оси ординат. Поскольку распределения поврежденности, полученные в ходе конечно-элементного эксперимента, соответствуют известным экспериментальным результатам [48,49], рассматриваемая материальная модель была использована для решения более сложных задач, для анализа зон активного накопления повреждений у вершины трещины.…”

Section: распределение поврежденности в пластине с центральным круговunclassified

Computational Simulation of the Damage Accumulation Processes in Cracked Solids by the User Procedure Umat of Simulia Abaqus

Степанова

2018

PNRPU MB

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The paper presents the experience of using the user subroutine UMAT for FEM package SIMULIA Abaqus/CAE for damage accumulation processes in the vicinity of the crack. A continuum damage mechanics model based on the constitutive relations of linear elastic isotropic materials with the incorporated damage tensor components is used to describe the material behavior. The material nonlinearity arising from the deformation process is modelled by introducing an anisotropic damage tensor of the second rank into the constitutive equation. The material model is described by means of user procedure UMAT of SIMULIA Abaqus. The finite element (FE) mechanical constitutive model is implemented in Abaqus/Standard via a UMAT routine. Numerical experiments for a large series of cracked specimens have been performed. Computed stress and damage tensor components were found. It is shown that they are not dependent on the FE mesh refinement. Distributions of the damage tensor components in the vicinity of the crack tip in cracked specimens of different configurations under mixed mode loading in a wide range of mixed mode loadings are found. The configurations of active damage accumulation process zone in the cracked specimens are obtained. It is shown that the damage accumulation process has a substantial influence on the stress-strain state in the vicinity of the crack tip and leads to a decrease of the stress concentration in cracked specimens.

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Strength degradation and stress analysis of composite plates with circular, square and rectangular notches using digital image correlation

Cited by 85 publications

References 38 publications

The influence of fibre alignment on the fracture toughness of anisotropic soft tissue

The influence of fibre alignment on the fracture toughness of anisotropic soft tissue

Experimental and modeling stress concentration factor (SCF) of a tension poly lactic acid (PLA) plate with two circular holes

Computational Simulation of the Damage Accumulation Processes in Cracked Solids by the User Procedure Umat of Simulia Abaqus

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