Investigating Fatigue Damage Evolution In Adhesively Bonded Structures Using Backface Strain Measurement

Crocombe, A.D.; Ong, C.Y.; Chan, Cheng-Feng; Wahab, Magd Abdel; Ashcroft, Ian

doi:10.1080/00218460213835

Cited by 90 publications

(55 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To take advantage of the simple experimental arrangement and low cost of the wedge test, but in order to monitor crack propagation more quantitatively, we developed an instrumented asymmetric wedge test (one adherend much more rigid than the other Budzik et al 2009aBudzik et al ,b, 2011a. In this technique, strain gauges are bonded on the outer skin of the flexible adherend loaded in simple bending (sometimes referred to as the backface technique Crocombe et al 2002;Hadavinia et al 2002). Surface strain variation is linear along the free region (e.g.…”

Section: Introductionmentioning

confidence: 99%

An in situ technique for the assessment of adhesive properties of a joint under load

2011

View full text Add to dashboard Cite

Slow crack propagation in adhesive bonded joints has been characterised using an asymmetric wedge test. Crack position was evaluated from strain gauge measurements, both in the debonded part of the joint and in the bonded zone. Test temperature was changed during loading, giving insight into bond evolution. The technique allows accurate, and virtually continuous, determination of crack position to be made, and therefore the evaluation of crack speed versus fracture energy curves, as well as elastic properties of the adhesive layer. This technique also enables the monitoring of crack propagation in controlled environmental conditions to be performed, without interruption of exposure for measurements. By using a Winkler elastic foundation model to analyse results, the method seems to be the first to describe a process zone, or region where the adhesive is significantly strained under load, and a finite length specimen effect, manifested by crack front acceleration during the final stage of the test. The method was found to offer great potential to study in situ fracture and bulk adhesive properties.

show abstract

Section: Introductionmentioning

confidence: 99%

An in situ technique for the assessment of adhesive properties of a joint under load

2011

View full text Add to dashboard Cite

show abstract

“…1). It is recommended that the centres of gauges are located 1-2 mm inside the edge of lap [20]. Additional strain gauges were used to get more information on the damage propagation.…”

Section: Mechanical Testingmentioning

confidence: 99%

“…This was then extended to adhesively bonded joints to detect damage initiation [19]. Further study showed that the peak strain often occurred when the damage has reached the detecting gauge position [20]. Experimental evidence combining microscopy images of partially fatigued joints with backface strain measurements showed that the damage initiation process occupied up to 50% of total fatigue life [21].…”

Section: Introductionmentioning

confidence: 99%

The fatigue response of environmentally degraded adhesively bonded aluminium structures

Sugiman

Crocombe

Aschroft

2013

International Journal of Adhesion and Adhesives

View full text Add to dashboard Cite

“…Various NDE (nondestructive evaluation) techniques have been suggested to monitor bonded joints based on ultrasonic, acoustic, thermal and backface strain measurements [e.g. [1][2][3][4]. Among NDE optical techniques suggested, the use of uniform fibre Bragg grating (FBG) sensors has been the most widely favoured, with a number of 2 demonstrations available in the literature for monitoring bonded joints, repairs and structures [e.g.…”

Section: Introductionmentioning

confidence: 99%

Disbond growth detection in composite–composite single-lap joints using chirped FBG sensors

Palaniappan

Ogin

Thorne

et al. 2008

Composites Science and Technology

View full text Add to dashboard Cite

Adhesively bonded composite-composite single-lap joints, with cross-ply GFRP adherends, have been cyclically loaded to initiate disbonding at either end of the overlap length. Disbond initiation and growth have been monitored using a combination of in situ photography (the joint is transparent) and a single chirped fibre Bragg grating (CFBG) sensor embedded within one composite adherend (with the low-wavelength end of the sensor adjacent to the cut end) and not in the adhesive bondline. Sensors having the same spectral bandwidth (20 nm), and lengths in the range 15 mm to 60 mm have been tested. The experimental results have been modelled using a combination of finite-element analysis and commercial software for predicting FBG spectra, and the predictions are in very good agreement with the experimental results. In all cases, it has been shown that the position of the disbond front can be located using the CFBG sensors with a precision of about 2 mm.

show abstract

Investigating Fatigue Damage Evolution In Adhesively Bonded Structures Using Backface Strain Measurement

Cited by 90 publications

References 11 publications

An in situ technique for the assessment of adhesive properties of a joint under load

An in situ technique for the assessment of adhesive properties of a joint under load

The fatigue response of environmentally degraded adhesively bonded aluminium structures

Disbond growth detection in composite–composite single-lap joints using chirped FBG sensors

Contact Info

Product

Resources

About