Analysis of cracked aluminum plates repaired with bonded composite patches

Sun, C. T.; Klug, John C.; Arendt, C.

doi:10.2514/6.1995-1505

Cited by 30 publications

(63 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Presented model accuracy is verified by comparisons shown in Table I. The obtained normalized SIF is larger than the Sun's 2D result (Sun et al, 1996), and is in-between the Papanikos et al 's (2005) and the Chau's (2000) 3D models; it is close to the Mall and Naboulsi's (1996) result. Based on this comparison, the presented model can reflect the actual structure conditions and reasonably satisfy the calculation accuracy requirements.…”

Section: Finite Element Model Validationsupporting

confidence: 69%

Bonded composite repair structures multiple site damage analysis

Chen

Tran

Volinsky

2013

Aircraft Engineering and Aerospace Technology

View full text Add to dashboard Cite

Purpose -The purpose of this work is to describe the effects of the length of cracks and the patch size on the stress intensity factors in a bonded composite repair structure containing multiple site damage. Design/methodology/approach -Finite element method was applied to simulate a bonded repair of a cracked aluminum plate with multiple site damage. A two-dimensional three-layer technique was utilized to model damage in a typical aluminum plate with collinear twin cracks. Findings -This research has found that the stress intensity factors of collinear twin cracks can be reduced significantly through bonded composite repair, and their values strongly depend on the relative position of the cracks. Moreover, the composite patch should be 1.5 to two times longer than the crack length and the patch thickness should be 30-40 percent of the plate thickness for the best repair performance. Research limitations/implications -Patch debonding can significantly reduce the repair efficiency and should be avoided if possible. Originality/value -It is seen that, instead of the three-dimensional finite element model, which is computationally intense, the two-dimensional three-layer finite element model has an adequate accuracy to obtain stress intensity factors in a bonded composite repair structure with multiple site damage.

show abstract

Section: Finite Element Model Validationsupporting

confidence: 69%

Bonded composite repair structures multiple site damage analysis

Chen

Tran

Volinsky

2013

Aircraft Engineering and Aerospace Technology

View full text Add to dashboard Cite

show abstract

“…They are assumed to be constant across the adhesive thickness. This assumption is a natural extension of that widely used in adhesive bonded joints and/or repairs to flat surfaces or plates [10,[12][13][14]. (c) The thin-walled parent structure and bonded patch can be modeled using the first-order or moderately thick plate and shell theory.…”

Section: Fundamental Formulation Of Adhesive Elementmentioning

confidence: 99%

“…Based on assumptions common to the theories of Goland Reissner [10] and Ojalvo and Eidinoff [11], Carpenter [12] developed two adhesive elements in which both shear and peel stresses are included in the finite element formulation of the adhesive element. Sun et al [13] and Klug and Sun [14] presented an efficient model for bonded repair to cracked aluminum plates. In their model, both aluminum plate and composite patch are modeled separately by the Midlin plate element, whereas the adhesive layer is modeled with effective springs connecting the patch and aluminum plate.…”

Section: Introductionmentioning

confidence: 98%

Adhesive elements for stress analysis of bonded patch to curved thin-walled structures

Tong

Sun

2003

Computational Mechanics

View full text Add to dashboard Cite

Bonded composite patching has been recognized as an efficient and economical method to extend the service life of cracked aluminum components. However, current analysis methods and empirical databases for designing composite bonded joint and patch repair are limited to flat plate and/or flat laminate geometries, and the effect of curvature on the performance and durability of composite bonded joints and repairs is not known. This paper presents a novel finite element formulation for developing adhesive elements for conducting quick stress analysis of bonded repairs to curved structures. Illustrative examples are presented to demonstrate the effect of curvature and the effect of patch location, i.e., internal and external patches, patch size and patch thickness on stresses in adhesive layer.

show abstract

“…e idea is to extend and consolidate this strengthening technique applied for the structures of metal shells against buckling. Few studies indeed consider the shells case but the reinforcement discussed is very localized, as patch to inhibit fatigue crack appearance or propagation [12], or to shade off localized defect and stop their effects [13,14]. To our knowledge, there has not yet been any quantitative study on the buckling behavior of metal shells strengthened with CFRP composite, based on both experimental and numerical approaches.…”

Section: Introductionmentioning

confidence: 99%

Buckling Behavior of Metallic Cylindrical Shell Structures Strengthened with CFRP Composite

Draidi

Bui

Limam

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

e objective of this study is to evaluate the effect of a CFRP composite layer on the buckling behavior of metallic cylindrical shells. To enhance the bearing capacity of steel shells, classical solutions consider internal or external metallic stiffeners (stringers and/or rings) welded or riveted to the shell. Here, an external skin of composite material which wraps the whole metallic skin of the shell is studied. To be valid for metallic shells structures (storage tanks like silos) as well as for metal pipes (gas or oil pipeline), the procedure for setting up and implementing the composite must be simple. e recommended solution is therefore tested through experimental tests to find their limits and the configuration of optimal behavior. A consistent enhancement of bearing capacity is observed. is experimental base serves also to consolidate a numerical model which corroborates the experimental results. e good correlation between experimental and numerical results is confirmed for the whole loading process, for unstiffened and stiffened shells. For metallic unstiffened shell, an adequacy between experiment and simulation is noticed in the mainly membrane precritical behavior, during the buckling initiation characterized by the boundary layer problem corresponding to axisymmetric wavelength appearance near boundaries and in the postcritical domain associated to localization of the buckling mode at one extremity of the shell. For stiffened configuration, the enhancement of the bearing capacity of the shell is correctly gauged; this confirms the possibility to use finite element simulation for the design.

show abstract

Analysis of cracked aluminum plates repaired with bonded composite patches

Cited by 30 publications

References 5 publications

Bonded composite repair structures multiple site damage analysis

Bonded composite repair structures multiple site damage analysis

Adhesive elements for stress analysis of bonded patch to curved thin-walled structures

Buckling Behavior of Metallic Cylindrical Shell Structures Strengthened with CFRP Composite

Contact Info

Product

Resources

About