Development of a Monitoring System for Crack Growth in Bonded Single-Lap Joints Based on the Strain Field and Visualization by Augmented Reality

2014 ◽  
Vol 90 (5-6) ◽  
pp. 496-510 ◽  
Author(s):  
Andrea Bernasconi ◽  
Md Kharshiduzzaman ◽  
Luca Francesco Anodio ◽  
Monica Bordegoni ◽  
Guido Maria Re ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Crack Growth ◽  
Monitoring System ◽  
Strain Field ◽  
Lap Joints ◽  
Single Lap Joints

Fatigue Crack Growth of Bondline Cracks in Structural Bonded Joints

1978 ◽  
Vol 100 (1) ◽  
pp. 39-45 ◽  
Author(s):  
T. R. Brussat ◽  
S. T. Chiu
Keyword(s):  
Fatigue Crack ◽  
Crack Growth ◽  
Growth Rates ◽  
Fatigue Tests ◽  
Lap Joints ◽  
Bonded Joints ◽  
Growth Data ◽  
Single Lap Joints ◽  
Mechanics Analysis ◽  
Crack Growth Rates

Adhesive bondline crack growth data are presented from fatigue tests of structural bonded single-lap joints with initial bondline flaws. Crack growth was successfully monitored both ultrasonically and by a compliance technique. A fracture mechanics analysis estimate of bondline crack growth rates in these tests is described, and the estimated rates are compared to the actual monitored crack growth rates.

scholarly journals Experimental Study of the Influence of the Surface Preparation on the Fatigue Behavior of Polyamide Single Lap Joints

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1008
Author(s):  
Francesco Musiari ◽  
Fabrizio Moroni
Keyword(s):  
Experimental Study ◽  
Fatigue Behavior ◽  
Atmospheric Pressure Plasma ◽  
Surface Preparation ◽  
Lap Joints ◽  
Polymeric Surfaces ◽  
Adhesively Bonded Joints ◽  
Single Lap Joints ◽  
Number Of Cycles ◽  
Structural Adhesive

The low quality of adhesion performance on polymeric surfaces has forced the development of specific pretreatments able to toughen the interface between substrate and adhesive. Among these methods, atmospheric pressure plasma treatment (APPT) appears particularly suitable for its environmental compatibility and its effectiveness in altering the chemical state of the surface. In this work, an experimental study on adhesively bonded joints realized using polyamide as substrates and polyurethane as the structural adhesive was carried out with the intent to characterize their fatigue behavior, which represents a key issue of such joints during their working life. The single lap joint (SLJ) geometry was chosen and several surface pretreatments were compared with each other: degreasing, abrasion (alone and followed by APPT) and finally APPT. The results show that the abrasion combined with APPT presents the most promising behavior, which appears consistent with the higher percentage of life spent for crack propagation found by means of DIC on this class of joints with respect to the others. APPT alone confers a good fatigue resistance with respect to the simple abrasion, especially at a low number of cycles to failure.

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