Strength Prediction of Composite Single Lap Joints Using the Critical Longitudinal Strain Criterion and a Meshless Method

2021 ◽  
pp. 102884
Author(s):  
Luís D.C. Ramalho ◽  
Isidro J. Sánchez-Arce ◽  
Raul D.S.G. Campilho ◽  
Jorge Belinha
Keyword(s):  
Meshless Method ◽  
Longitudinal Strain ◽  
Lap Joints ◽  
Strength Prediction ◽  
Strain Criterion ◽  
Single Lap Joints

Using a Meshless Method to Predict the Strength of Adhesive Single Lap Joints

2021 ◽  
Author(s):  
Luís D.C. Ramalho ◽  
Isidro J. Sánchez-Arce ◽  
Raul D.S.G. Campilho ◽  
Jorge Belinha
Keyword(s):  
Meshless Method ◽  
Lap Joints ◽  
Single Lap Joints

scholarly journals Analyzing single-lap joints bonded with a brittle adhesive by an elastic meshless method

2020 ◽  
Vol 28 ◽  
pp. 1084-1093
Author(s):  
I.J. Sánchez-Arce ◽  
L.D.C. Ramalho ◽  
R.D.S.G. Campilho ◽  
J. Belinha
Keyword(s):  
Meshless Method ◽  
Lap Joints ◽  
Single Lap Joints

Predicting static strength in adhesively bonded single lap joints using a critical distance based method: Substrate thickness and overlap length effects

2016 ◽  
Vol 231 (1-2) ◽  
pp. 237-246 ◽  
Author(s):  
H Khoramishad ◽  
A Akhavan-Safar ◽  
MR Ayatollahi ◽  
LFM da Silva
Keyword(s):  
Longitudinal Strain ◽  
Critical Value ◽  
Critical Distance ◽  
Static Strength ◽  
Lap Joints ◽  
Substrate Thickness ◽  
Adhesively Bonded ◽  
Single Lap Joints ◽  
Failure Loads ◽  
Two Parameters

A critical distance based method was proposed for predicting the strength of adhesive single lap joints. Using this method, the failure of SLJs was predicted when the longitudinal strain along the adhesive mid-plane reached a critical value at a specific critical distance. The two parameters of the method including the critical longitudinal strain and the critical distance can be determined using experimental results. Several single lap joints with different overlap lengths and substrate thicknesses were manufactured and tested under quasi-static loading. It was found that the critical distance was independent of the overlap length and the substrate thickness while the critical longitudinal strain was found to be dependent on the substrate thickness. However, the effect of substrate thickness on the critical longitudinal strain decreased by increasing the substrate thickness. The correlation between the experimental and predicted failure loads was found to be very well.

Shear Strength Prediction of Single Lap Joints Based on Latin Hypercube Method

2011 ◽  
Vol 101-102 ◽  
pp. 681-684
Author(s):  
Long Li ◽  
Ping Hu ◽  
Wei Dong Li ◽  
Xiao Qiang Han
Keyword(s):  
Shear Strength ◽  
Yield Strength ◽  
Failure Load ◽  
Lap Joints ◽  
Strength Prediction ◽  
Predictive Equation ◽  
Latin Hypercube ◽  
Single Lap Joints ◽  
Test Speed ◽  
Adhesive Thickness

Adhesive bonded single lap joints are used extensively in the manufacture of automobile structures. However, the joints involve many factors such as the overlap, the adherend thickness, the adherend yield strength etc. Therefore, strength prediction is a controversial issue. In order to quantify the effects of various variables, Latin Hypercube method was used to design the tests of simulation in the present study. The failure load predictive equation involving the factors of the overlap, the adherend thickness, the adherend yield strength, the adhesive thickness, the test speed and the adhesive toughness were achieved. The tests of single lap joints in tension load were carried on; while the results form experiments and formula were compared to verify its validation for strength prediction.

Overview of different strength prediction techniques for single-lap bonded joints

2016 ◽  
Vol 231 (1-2) ◽  
pp. 210-223 ◽  
Author(s):  
CCRG de Sousa ◽  
RDSG Campilho ◽  
EAS Marques ◽  
M Costa ◽  
LFM da Silva
Keyword(s):  
Analytical Methods ◽  
Accurate Method ◽  
Epoxy Adhesive ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Strength Prediction ◽  
Bonded Joints ◽  
Stress Concentrations ◽  
Single Lap Joints ◽  
Structural Applications

Adhesive joints have been used in several fields of engineering, and their applications are vast. Due to their easy and quick fabrication process, single-lap joints are a common configuration. The increase of strength, weight reduction and resistance to corrosion are some of the advantages of this kind of joint over traditional joining methods. However, stress concentrations at the overlap edges are one of the main disadvantages. There are very few accurate design techniques for the diversity of bonded joints that can be found in real applications, which constitutes an obstacle to the use of this bonding method in structural applications. This work aims at comparing different analytical and numerical methods in the strength prediction of single-lap joints with different overlap lengths ( LO). The main objective is to evaluate which predictive method is the best. Adhesive joints were produced between aluminium adherends using a brittle epoxy adhesive (Araldite® AV138), a moderately ductile epoxy adhesive (Araldite® 2015) and a ductile polyurethane adhesive (Sikaforce® 7888). Different analytical methods were considered, together with two numerical techniques: cohesive zone models (CZM) and the extended finite element method (XFEM), allowing the comparative analysis. The analytical methods showed that they only give relatively accurate results in very specific conditions. The CZM analysis with the triangular law revealed to be a very accurate method, with the exception of joints with very ductile adhesives. On the other hand, the XFEM analysis was not adequate, especially for crack growth in mixed mode.

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