scholarly journals A generalised damage model for constant amplitude fatigue loading of adhesively bonded joints

2010 ◽  
Vol 30 (6) ◽  
pp. 513-521 ◽  
Author(s):  
H. Khoramishad ◽  
A.D. Crocombe ◽  
K.B. Katnam ◽  
I.A. Ashcroft
Keyword(s):  
Damage Model ◽  
Fatigue Loading ◽  
Bonded Joints ◽  
Constant Amplitude ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints

Integrity monitoring of adhesively bonded joints via an electromechanical impedance-based approach

2017 ◽  
Vol 17 (5) ◽  
pp. 1031-1045 ◽  
Author(s):  
Yitao Zhuang ◽  
Fotis Kopsaftopoulos ◽  
Roberto Dugnani ◽  
Fu-Kuo Chang
Keyword(s):  
Fatigue Loading ◽  
Mechanical Tests ◽  
Lap Joints ◽  
Piezoelectric Sensors ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Monitoring Method ◽  
Integrity Monitoring ◽  
Adhesively Bonded Joints ◽  
Electromechanical Impedance

Monitoring the bondline integrity of adhesively bonded joints is one of the most critical concerns in the design of aircraft structures to date. Due to the lack of confidence on the integrity of the bondline both during fabrication and service, the industry standards and regulations require assembling the primary airframe structure using the inefficient “black-aluminum” approach, that is, drill holes and use fasteners. Furthermore, state-of-the-art non-destructive evaluation and structural health monitoring approaches are not yet able to provide mature solutions on the issue of bondline integrity monitoring. Therefore, the objective of this work is the introduction and feasibility investigation of a novel bondline integrity monitoring method that is based on the use of piezoelectric sensors embedded inside adhesively bonded joints in order to provide an early detection of bondline degradation. The proposed approach incorporates (1) micro-sensors embedded inside the adhesive layer leaving a minimal footprint on the material, (2) numerical and analytical modeling of the electromechanical impedance of the adhesive bondline, and (3) electromechanical impedance–based diagnostic algorithms for monitoring and assessing the bondline integrity. The experimental validation and assessment of the proposed approach is achieved via the design and fabrication of prototype adhesively bonded lap joints with embedded piezoelectric sensors and a series of mechanical tests under various static and dynamic (fatigue) loading conditions. The obtained results demonstrate the potential of the proposed approach in providing increased confidence on the use of adhesively bonded joints for aerospace structures.

Crack growth in adhesively bonded joints subjected to variable frequency fatigue loading

2003 ◽  
Vol 79 (12) ◽  
pp. 1161-1182 ◽  
Author(s):  
A. H. Al-Ghamdi ◽  
I. A. Ashcroft ◽  
A. D. Crocombe ◽  
M. M. Abdel-Wahab
Keyword(s):  
Crack Growth ◽  
Fatigue Loading ◽  
Variable Frequency ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints

Parameter Identification of a Damage Model for the Lifetime Prediction of Adhesively Bonded Joints

2015 ◽  
Vol 784 ◽  
pp. 300-307 ◽  
Author(s):  
Ulrich Kroll ◽  
Anton Matzenmiller
Keyword(s):  
Parameter Identification ◽  
Model Prediction ◽  
Damage Model ◽  
Fatigue Tests ◽  
Model Parameters ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Creep Fatigue ◽  
Identification Strategy

A damage model for thin adhesively bonded joints is presented, which predicts the time to creep-fatigue failure of the joint subjected to combined static and cyclic sustained loadings with constant or variable amplitudes. The influences of particular model parameters on the predicted lifetime are elaborated suggesting the proposed stepwise parameter identification strategy by means of creep and Wöhler fatigue tests until rupture. The parameters are identified and computationally optimized. As a conclusion, the model prediction is verified and validated.

scholarly journals Strength wearout of adhesively bonded joints under constant amplitude fatigue

2009 ◽  
Vol 31 (5) ◽  
pp. 820-830 ◽  
Author(s):  
V. Shenoy ◽  
I.A. Ashcroft ◽  
G.W. Critchlow ◽  
A.D. Crocombe ◽  
M.M. Abdel Wahab
Keyword(s):  
Bonded Joints ◽  
Constant Amplitude ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints
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