Fatigue studies on patch repaired carbon/epoxy woven composites

Bhatia, Gursahib Singh; Arockiarajan, A.

doi:10.1016/j.compositesb.2019.107121

Cited by 19 publications

(13 citation statements)

References 18 publications

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“…Bhatia et al [34] (2020) Effect of patch-parent stiffness, patch placement Effect of patch placement is greater than stiffness on fatigue life G.S. Bhatia et al [35] (2019) Effect of patch-parent stiffness and stacking sequence…”

Section: Referencementioning

confidence: 99%

Compressive fatigue behavior of external patch repaired carbon/epoxy composites

Bhatia

Arockiarajan

2021

Polymer Composites

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This work involves an experimental investigation of the external patch repaired woven carbon fiber-reinforced polymer laminates under load controlled constant amplitude compressive fatigue loading. The specimens of parent laminates with stacking sequence [0/45] s and [45/0] s were both repaired with two types of precured patches viz. [0] 2 and [45] 2 representing high stiff and low-stiff cases. Digital image correlation and acoustic emission were employed to obtain the insight to the development of distinctive failure modes.The observations during the tests reveal a slow increase in the displacement for most part of the life followed by a rapid increase in the displacement signifying the failure due to fatigue. The examination of failed specimens reveal failure through hole for drilled (with hole) specimens compared to failure away from repaired zone indicating the significant reinforcement provided by external patch repair under cyclic loading. From life aspect, the drilled specimens possess a significantly lesser life (zero to few hundred cycles) compared to the patch repaired and pristine specimens (of order of few thousand cycles) highlighting the suitability of the external patch repair to restore the fatigue performance under compressive loading.

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Section: Referencementioning

confidence: 99%

Compressive fatigue behavior of external patch repaired carbon/epoxy composites

Bhatia

Arockiarajan

2021

Polymer Composites

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“…The influence of the stacking sequence and fiber orientation of the patches has also been investigated by various researchers. [24][25][26] From the available literature, a significant understanding can be developed regarding the influence of various repair parameters in general. However, the behavior of the repaired laminates can vary notably based on the type of loading experienced by the laminates.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the stacking sequence and fiber orientation of the patches has also been investigated by various researchers. [ 24–26 ]…”

Section: Introductionmentioning

confidence: 99%

Flexural static and fatigue response of patch repaired laminated composites for different patch‐parent configurations

Bhatia

Arockiarajan

2020

Polymer Composites

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This work involves an experimental investigation of the static and fatigue behavior of patch repaired laminates under flexural loading. At first, a static flexural study is conducted for two types of parent laminates comprising 4plies ([0 ] 4 & [45 ] 4) and 8-plies ([0 ] 8 & [45 ] 8) of woven carbon fiber. The repair is conducted by two types of patches with stacking sequence [0 ] 2 and [45 ] 2. Three different repair configurations involving patch bonded on the compressive side, tensile side, and both the sides of the parent specimens, have been tested. Digital image correlation has been employed to capture the deflection of the specimens. In order to understand the vulnerability of patch repaired laminates to cyclic loading, the load controlled constant amplitude fatigue tests have been conducted on 8-ply repaired laminates. Different failure modes, distinctive to each type of repair configurations have been observed. The results of this work provide more insight to the influence of various parameters viz. number of plies, fiber orientation, patch placement, and so forth, on the flexural behavior of repaired laminates.

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“…these two mechanical properties of the damaged structure. All numerical or experimental studies invested in the repair field have indicated that the repair technique by composite patch is effective and profitable [6][7][8][9]. In order to make the repair more efficient, several authors have worked to analyze numerically the mechanical and failure behavior of the repaired structure and then to optimize the composite and the adhesive by looking for more suitable mechanical properties to absorb, as much as possible, the stresses of the damaged area; others have searched to optimize the geometric shape to reduce more and more stresses at the crack tip.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of modifying the thickness of a damaged and repaired plate by composite patch on the J-Integral; effect of bonding defects

Kaddouri¹,

Madani²,

Rezgani

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The composite patch bonding technique in the damaged area has demonstrated its effectiveness in reducing stresses at the stress concentration zones and has ensured a long service life of the repaired structure. The search for a suitable adhesive and patch for good load transfer has led researchers to develop, by mechanical tests, analytical or numerical methods, ideas about the shape, nature, stacking sequence type of adhesive for a better combination of patch and adhesive. Our work fits into this context; the aim is to provide a method to reduce the stresses on the plate by protecting the adhesive against the effect of aging, which significantly affects the mechanical properties of the adhesive and the composite patch. Several factors have been highlighted namely, the effect of the composite stacking sequence, modification of the thickness of the plate, the presence of bonding defects in different positions. The analysis of the J-Integral and the stresses in the adhesive and the patch shows clearly that their values depend strongly on these different parameters. However, the modification made to the plate has no effect on the stress concentration.

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Fatigue studies on patch repaired carbon/epoxy woven composites

Cited by 19 publications

References 18 publications

Compressive fatigue behavior of external patch repaired carbon/epoxy composites

Compressive fatigue behavior of external patch repaired carbon/epoxy composites

Flexural static and fatigue response of patch repaired laminated composites for different patch‐parent configurations

Analysis of the effect of modifying the thickness of a damaged and repaired plate by composite patch on the J-Integral; effect of bonding defects

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