Stress Field Sensitivity of a Composite Patch Repair as a Result of Varying Patch Thickness

2009 ◽  
pp. 444-444-21 ◽  
Author(s):  
MP Siener
Keyword(s):  
Stress Field ◽  
Patch Repair ◽  
Composite Patch ◽  
Field Sensitivity

Development of smart bonded composite patch repair solution

2020 ◽  
Author(s):  
Florian Lambinet ◽  
Zahra Sharif Khodaei
Keyword(s):  
Patch Repair ◽  
Composite Patch ◽  
Bonded Composite

Towards hybridization of composite patch in repair of cracked Aluminum panel

2019 ◽  
Vol 10 (6) ◽  
pp. 868-887
Author(s):  
Alpesh H. Makwana ◽  
A.A. Shaikh
Keyword(s):  
Stress Intensity ◽  
Carbon Fiber ◽  
Hybrid Composite ◽  
Adhesive Layer ◽  
Patch Repair ◽  
Element Analysis ◽  
Interfacial Stresses ◽  
Content Type ◽  
Composite Patch ◽  
Repair Efficiency

Purpose The maintenance of aircraft structure with lower cost is one of the prime concerns to regulatory authorities. The carbon fiber-reinforced polymer (CFRP) patches are widely used to repair the cracked structure. The demands and application of CFRP compel its price to increase in the near future. A distinct perspective of repairing the cracked aluminum panel with the hybrid composite patch is presented in this paper. The purpose of this paper is to propose an alternative patch material in the form of a hybrid composite patch which can provide economical repair solution. Design/methodology/approach The patch hybridization is performed by preparing the hybrid composite from tows of carbon fiber and glass fiber. Rule of hybrid mixture and modified Halpin–Tsai’s equation are used to evaluate the elastic constant. The stress intensity factor and interfacial stresses are determined using finite element analysis. The debonding initiation load is evaluated after testing under mode-I loading condition. Findings The hybrid composite patch has rendered the adequate performance for reduction of stress intensity in the cracked panel and control of interfacial stresses in the adhesive layer. The repair efficiency and repair durability of the composite patch repair was ensured by incorporation of the hybrid composite patch. Originality/value The studies involving patch hybridization for the application of composite patch repair are presently lacking. The influence of the patch stiffness, methodology to prepare the hybrid composite patch and effects of hybridization on the performance of composite patch repair is presented in this paper.

Assessment of Bonded Patch Bridge Repairs Using Acoustic Emission and Acousto-Ultrasonics

2012 ◽  
Vol 518 ◽  
pp. 57-65 ◽  
Author(s):  
Rhys Pullin ◽  
Mark J. Eaton ◽  
Matthew R. Pearson ◽  
Christopher Pollard ◽  
Karen M. Holford
Keyword(s):  
Acoustic Emission ◽  
Acoustic Energy ◽  
Patch Repair ◽  
Function Technique ◽  
Experimental Program ◽  
Strain Gauges ◽  
Active Monitoring ◽  
Structural Bond ◽  
Static Tests ◽  
Composite Patch

Composite patch repairs are being increasingly used throughout bridge structures in the UK. These patches offer a convenient and strong repair providing that the bond used to adhere the patch to the structure retains its integrity. Acoustic emission (AE), a passive approach and Acousto-Ultrasonic (AU), an active approach offer two methodologies for monitoring the structural bond and ensuring the patch repair remains effective. An experimental program was developed to assess the suitability of using AE and AU for monitoring the bond. Two concrete beams were manufactured and pre-cracked in three point bending prior to being repaired using a bonded composite patch. Two static tests were then completed to assess the performance of the two techniques for monitoring the bond. Results were compared with strain gauges adhered to the bonded patch and visual observation. For active monitoring a baseline of signals were captured at a known load and post damage a further series was captured at the same load. The signals sets were then compared using a cross correlation function technique. A simple accumulative acoustic energy analysis was then completed for the passive data. Results demonstrated that both techniques can be utilised to monitor the bonded structure. By comparing the results with those recorded by the strain gauges and visual inspection it was possible to demonstrate the successful effectiveness of the techniques for detecting global damage but specific debonding events would require further investigations.

Heat Transfer in Thin Multilayered Plates—Part II: Applications to the Composite Patch Repair Technique

2010 ◽  
Vol 133 (2) ◽  
Author(s):  
T. K. Papathanasiou ◽  
S. I. Markolefas ◽  
S. P. Filopoulos ◽  
G. J. Tsamasphyros
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Patch Repair ◽  
Small Thickness ◽  
Composite Patch ◽  
Repair Technique ◽  
Previous Part ◽  
Extended Surface ◽  
Multilayered Plates

This second part of our contribution entitled, “Heat Transfer in Thin Multilayered Plates,” refers to the modeling of an advanced repair technique, known as the composite patch repair (CPR). Thermal analysis of this particular application is highly complicated due to the geometry of the domains and the fact that many different materials participate in the implementation. In this paper, we take advantage of the fact that both the composite patch and the damaged plate to be repaired are of very small thickness. In that way, the whole domain may be treated as a thin multilayer area of extended surface. These properties make the thermal analysis of CPR an ideal field for using the method presented in the previous part of our analysis.

Performance assessment and optimization of hybrid composite patch repair of aircraft structure

2020 ◽  
Vol 16 (5) ◽  
pp. 887-913
Author(s):  
Alpesh H. Makwana ◽  
A.A. Shaikh
Keyword(s):  
Glass Fiber ◽  
Hybrid Composite ◽  
Volume Fraction ◽  
Patch Repair ◽  
Design Parameters ◽  
Aircraft Structure ◽  
Content Type ◽  
Composite Patch ◽  
Peel Stress ◽  
Selection Of

PurposeIn this article, a novel hybrid composite patch consisting of unidirectional carbon fiber and glass fiber is considered for repair of the aircraft structure. The purpose of this paper is to assess the performance of hybrid composite patch repair of cracked structure and propose an optimized solution to a designer for selection of the appropriate level of a parameter to ensure effective repair solution.Design/methodology/approachElastic properties of the hybrid composites are estimated by micromechanical modeling. Performance of hybrid composite patch repair is evaluated by numerical analysis of stress intensity factor (SIF), shear stress, and peel stress. Design of experiment is used to determine responses for a different combination of design parameters. The second-order mathematical model is suggested for SIF and peel stress. Adequacy of the model is checked by ANOVA and used as a fitness function. Multiobjective optimization is carried out with a genetic algorithm to arrive at the optimal solution.FindingsThe hybrid composite patch has maintained equilibrium between the SIF reduction and rise of the peel stress. The repair efficiency and repair durability can be ensured by selection of an optimum value of volume fraction of glass fiber, applied stress, and adhesive thickness.Originality/valueThe composite patch with varying stiffness is realized by hybridization with different volume fraction of fibers. Analysis and identification of optimum parameter to reduce the SIF and peel stress for hybrid composite patch repair are presented in this article.

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