Non-Destructive Evaluation of Composite Adhesive Kissing Bond

Test Frame ◽

Adhesive Bonded Joints ◽

Adhesive bonded joints have been increasingly employed in aerospace, automotive, and other mechanical systems due to the advantages of uniform stress distribution, less stress concentration, light in weight, etc. However, the early damage stage of the adhesive bond joints, which are usually named as kissing bond, can significantly impact the structural integrity and safety. Kissing bond is difficult to detect and identify using current non-destructive evaluation (NDE) techniques since there is no clearly gap or interface between the bond area. Attempts using advanced ultrasonic methods have reached limited success, but more reliable methods need to be developed before adhesive joints can be more widely applied to the engineering field. This paper focuses on the development of detection method using digital image correlation (DIC) technique. Three types of adhesive kissing bond joint samples were fabricated using different contamination recipe to simulate the kissing bonds. The performance of the fabricated joint samples were tested using uniaxial hydraulic test frame and the detection capability of DIC system was investigated. The noncontact strain field measurement method using DIC can indicate the existence of kissing bonds with limited load. The results of DIC measurement is encouraging and can be further used for the NDE estimation of mechanical properties of the kissing bond.

Non-Destructive Evaluation of Damage Mechanisms in Composite Sandwich Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.13-14.105 ◽

2008 ◽

Vol 13-14 ◽

pp. 105-114

Author(s):

Amit Puri ◽

Alexander D. Fergusson ◽

I. Palmer ◽

Andrew Morris ◽

F. Jensen ◽

...

Keyword(s):

Wind Turbine ◽

Turbine Blade ◽

Structural Integrity ◽

Wind Turbine Blade ◽

Image Correlation ◽

Box Girder ◽

Full Field ◽

Composite Sandwich ◽

Non Destructive ◽

Dic Technique

This paper presents the experimental results obtained of flexurally loaded wind turbine blade cross section material. All material was extracted from a wind turbine blade box girder and testing was conducted in four point configuration. The aim was to gain an understanding of the structural integrity of this lightweight material as it deforms in flexure. To allow for thorough analysis, digital image correlation (DIC) was used to produce full field strain maps of the deforming specimens. Results highlight the capability of the DIC technique to identify regions of failure, as well as the aspects responsible for them. Overall, the results present a foundation for tests on larger substructure, and eventually integration into manufacturing and maintenance aspects of the industry.

The Effect of Geometry and Material Properties on the Load Capacity of Single-Strapped Adhesive Bonded Joints

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.399.89 ◽

2008 ◽

Vol 399 ◽

pp. 89-96 ◽

Cited By ~ 1

Author(s):

Marin Sandu ◽

Adriana Sandu ◽

Dan Mihai Constantinescu ◽

Ştefan Sorohan

Keyword(s):

Adhesive Bonding ◽

Load Capacity ◽

Dissimilar Materials ◽

Adhesive Layer ◽

Adhesive Bond ◽

Bonded Joints ◽

Adhesively Bonded ◽

Adhesive Bonded Joints ◽

Major Factors ◽

Selection Of

Adhesive bonding is a particularly effective method of assembling complex structures, especially those made from dissimilar materials. If the joint is well designed and correctly executed, the adhesive bond ought to be one of the strongest components of the structure and most certainly should not be the reason for reducing the load capacity or fatigue life. The major factors determining the integrity of an adhesive bond are selection of the most appropriate adhesive, joint design, preparation of the bonding surfaces, strict quality control in production and monitoring in service. This work focuses on the evaluation of the load capacity of some configurations of adhesively bonded single-strapped joints based on finite element analyses. The adhesive layer thickness, the overlap length, the adherent and strap thicknesses were varied as well as the materials properties.

18th International Conference of the North American Fuzzy Information Processing Society - NAFIPS (Cat. No.99TH8397) ◽

Towards faster, smoother, and more compact fuzzy approximation, with an application to non-destructive evaluation of space shuttle's structural integrity

10.1109/nafips.1999.781691 ◽

2003 ◽

Author(s):

Yeung Yam ◽

R. Osegueda ◽

V. Kreinovich

Keyword(s):

Structural Integrity ◽

Fuzzy Approximation ◽

Non-destructive evaluation by 3D digital image correlation method

10.1063/1.4914748 ◽

2015 ◽

Author(s):

H. Sam Huang

Keyword(s):

Digital Image Correlation ◽

Digital Image ◽

Correlation Method ◽

Image Correlation ◽

Digital Image Correlation Method ◽

3D Digital Image Correlation ◽

An appraisal of ultrasonic methods for the non-destructive evaluation of particle and fibre-filled thermoplastics

NDT International ◽

10.1016/0308-9126(90)91538-5 ◽

1990 ◽

Vol 23 (1) ◽

pp. 47

Keyword(s):

Ultrasonic Methods ◽

Laboratory Study on Non-Destructive Evaluation of Polyethylene Liquid Storage Tanks by Thermographic and Ultrasonic Methods

CivilEng ◽

10.3390/civileng2040045 ◽

2021 ◽

Vol 2 (4) ◽

pp. 823-851

Author(s):

Amir Behravan ◽

Matthew M. deJong ◽

Alexander S. Brand

Keyword(s):

Ultrasonic Testing ◽

Visual Inspection ◽

Phased Array ◽

Road Maintenance ◽

Storage Tanks ◽

Ultrasonic Methods ◽

Liquid Storage ◽

Deicing Chemicals ◽

High-density polyethylene (HDPE) above-ground storage tanks (AST) are used by highway agencies to store liquid deicing chemicals for the purpose of road maintenance in the winter. A sudden AST failure can cause significant economic and environmental impacts. While ASTs are routinely inspected to identify signs of aging and damage, current methods may not adequately capture all defects, particularly if they are subsurface or too small to be seen during visual inspection. Therefore, to improve the ability to identify potential durability issues with HDPE ASTs, additional non-destructive evaluation (NDE) techniques need to be considered and assessed for applicability. Specifically, this study investigates the efficiency of using infrared thermography (IRT) as a rapid method to simultaneously examine large areas of the tank exterior, which will be followed by closer inspections with conventional and phased array ultrasonic testing (UT) methods. Results show that IRT can help to detect defects that are shallow, specifically located within half of the tank’s wall thickness from the surface. UT has the ability to detect all defects at any depth. Moreover, phased array UT helps to identify stacked defects and characterize each defect more precisely than IRT.