Review Paper on Analysis of Composite Patches as a Crack Arrestor

Shinde, Prakash; Tripathi, V. K.; Kumar, Prashant; Sarkar, Prabir; Singh, K.K.

doi:10.3923/jeasci.2011.222.226

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Boron-epoxy composite patches are thinner and smaller and have better aerodynamics due to their higher stiffness. 7,32 For steel plates, the carbon-epoxy patch has been better than others. Then boron and graphite are appropriate.…”

Section: The Effect Of the Patch Base Metal And Adhesive Materials Omentioning

confidence: 97%

“…1 It is recommended that the patch length be 30 times the thickness of the patch in a one-sided and 50 to 100 times in a two-sided patch. 32 Reducing the patch thickness near the patch edges reduces the SCF of the shear and peel stresses. For thin sheets, the one-sided patch is useful but for thicker plates, it has less effect.…”

Section: The Effect Of the Patch Adhesive And Main Plate Geometry Onmentioning

confidence: 99%

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A review on composite patch repairs and the most important parameters affecting its efficiency and durability

Mohammadi

Yousefi

Khazaei

2020

Journal of Reinforced Plastics and Composites

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In many industries, when replacement of a part is not possible or economic, the repair is done. One of the best methods for repairing metal and composite parts is using composite patches. Repairing with a composite patch is a widespread field to extend the service life of the cracked components. This technique is more structurally efficient with fewer damages on the structure than others. The bonded patch offers many advantages over a mechanically fastened doubler, which include improved fatigue behavior, reduced corrosion, and easy conformance to complex aerodynamic contours. In this article, advantages of the composite patch and its efficiency and durability are discussed, and the most important parameters (patch and adhesive thickness, patch separation, residual stress, patch length and width, etc.) affecting its performance are studied based on the latest available references.

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Section: The Effect Of the Patch Base Metal And Adhesive Materials Omentioning

confidence: 97%

Section: The Effect Of the Patch Adhesive And Main Plate Geometry Onmentioning

confidence: 99%

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

Mohammadi

Yousefi

Khazaei

2020

Journal of Reinforced Plastics and Composites

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“…In general, repair can be broadly classified into passive and active repair. Over the last two decades, many passive repair studies have been carried out (Ergun et al, 2008; Katnam et al, 2013; Shinde et al, 2011). More recently, the performance of the piezoelectric actuation, in the context of the active crack repair, has been investigated by several researchers.…”

Section: Introductionmentioning

confidence: 99%

Modeling approach to evaluating reduction in stress intensity factor in center-cracked plate with piezoelectric actuator patches

Abuzaid

Hrairi

Dawood

2016

Journal of Intelligent Material Systems and Structures

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Active repairs using piezoelectric actuators can play a significant role in reducing the crack damage propagation in thin plate structures. Mode-I crack opening displacement is the most predominant one in tension, and it is responsible for the failure which in turn affects the load carrying capability of the cracked structure. In addition, there are limited studies that investigated the effect of the piezoelectric actuator over mode-I active repair. In this study, the mode-I stress intensity factor for a plate with a center crack, and a bonded piezoelectric actuator was modeled using the linear elastic fracture mechanics. For this, an analytical closed-form solution is developed using the virtual crack closure technique taking into account mode-I as the only effective mode, coupling effects of the piezoelectric patch, and the singular stress at the crack tip. In addition, the total stress intensity factor was obtained by the superposition of the stress intensity factor obtained from the stresses produced by the piezoelectric actuators on the crack surfaces as the only external loads on the cracked plate and the stress intensity factor due to the far-field tension load. The proposed analytical model for mode-I stress intensity factor was verified by a finite element–based approach using ANSYS finite element software. The results demonstrated a good agreement between the analytical and finite element models with a relative error of less than 4% in all the cases studied. The results illustrated that the piezoelectric patch is efficient in reducing stress intensity factor when an extension mode of the actuator is applied. However, applying a contraction mode of the piezoelectric actuators produced negative strain which increased the stress intensity factor and thus the severity of the cracked structure and could lead to damage propagation.

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“…Over the last two decades, only passive patch repair work has been studied, and currently researchers are working on active repair studies involving smart materials [1,2].…”

Section: Introductionmentioning

confidence: 99%

Survey of Active Structural Control and Repair Using Piezoelectric Patches

Abuzaid¹,

Hrairi²,

Dawood³

2015

Actuators

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Abstract:The piezoelectric actuator has gained popularity over the last few years. Attention has been directed towards the study of their electromechanical response in active repair and the control of damaged structures. This has been made possible through the development of various numerical and analytical techniques for such studies. The shift of focus towards the piezoelectric based approaches has been due to their advantages, which include strategic cost benefits in maintenance, as well as an increase in the life cycle of the repaired structures. Furthermore, adhesively bonded joints are widely used in the manufacturing and repairing of structures in many industries, especially automotive and aerospace engineering. This is due to the requirement for lightweight materials as well as the potential adhesive used to join materials with different characteristics. The piezoelectric actuator has also shown the capacity in controlling and lowering the shear stress concentration and joint edge peel in adhesively bonded joint systems. The structure's control of stress and repair can generally be viewed as a reinforcement that influences the structure's damage tolerance. Therefore, the interest of this review is on the applications of the piezoelectric actuators in both structural damage and the bonded adhesive joint system. The specific goal is to recognize the contemporary scientific challenges, including future opportunities.

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Review Paper on Analysis of Composite Patches as a Crack Arrestor

Cited by 5 publications

References 13 publications

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

A review on composite patch repairs and the most important parameters affecting its efficiency and durability

Modeling approach to evaluating reduction in stress intensity factor in center-cracked plate with piezoelectric actuator patches

Survey of Active Structural Control and Repair Using Piezoelectric Patches

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