Strength Prediction of RTM Single-Lap Joints With Transverse Stitching

1998 ◽  
Vol 120 (4) ◽  
pp. 300-303 ◽  
Author(s):  
Liyong Tong
Keyword(s):  
Analytical Model ◽  
Bending Moment ◽  
Lap Joints ◽  
Single Lap Joints ◽  
Rtm Process ◽  
Percent Improvement ◽  
Energy Release Rates ◽  
Failure Loads ◽  
Transfer Moulding ◽  
Transverse Stitching

It was experimentally shown that transverse stitching can provide an over 20 percent improvement in the strength of composite single-lap joints manufactured using the Resin Transfer Moulding (RTM) process. In this study, an analytical model is presented to predict the strength of the RTM single-lap joints with and without transverse stitching. Simple formulas are used to calculate the energy release rates of mode I and II using longitudinal membrane force and bending moment in a continuous adherent at an overlap end. The strengths of single-lap joints are determined using an interactive mixed-mode based failure criterion. A good correlation between the measured and the predicted failure loads validates the present analytical model.

Optimization of adhesive single-lap joints under bending moment

2021 ◽  
pp. 1-26
Author(s):  
Mojtaba Hassan Vand ◽  
Hessam Abbaszadeh ◽  
Mohammad Shishesaz
Keyword(s):  
Bending Moment ◽  
Lap Joints ◽  
Single Lap Joints

Failure analysis of simple overlap bonding joints and numerical investigation of the adhered tip geometry effect on the joint strength

2021 ◽  
Vol 63 (11) ◽  
pp. 1007-1011
Author(s):  
İsmail Saraç
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Reference Model ◽  
Lap Joints ◽  
Shear Stresses ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Failure Loads ◽  
Previous Experimental Study

Abstract This study was carried out in two stages. In the first step, a numerical study was performed to verify the previous experimental study. In accordance with the previous experimental study data, single lap joints models were created using the ANSYS finite element analysis program. Then, nonlinear stress and failure analyses were performed by applying the failure loads obtained in the experimental study. The maximum stress theory was used to find finite element failure loads of the single lap joints models. As a result of the finite element analysis, an approximate 80 % agreement was found between experimental and numerical results. In the second step of the study, in order to increase the bond strength, different overlap end geometry models were produced and peel and shear stresses in the adhesive layer were compared according to the reference model. As a result of the analyses, significant strength increases were calculated according to the reference model. The strength increase in model 3 and model 5 was found to be 80 % and 67 %, respectively, relative to the reference model.

Analytical and numerical investigation of bending moment coefficient in balanced single lap joints

2015 ◽  
Vol 44 (5) ◽  
pp. 173-181 ◽  
Author(s):  
G. C. Papanicolaou ◽  
P. J. Charitidis ◽  
D. E. Mouzakis ◽  
G. Jiga
Keyword(s):  
Numerical Investigation ◽  
Bending Moment ◽  
Lap Joints ◽  
Single Lap Joints ◽  
Moment Coefficient

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.

A New Finite Fracture Mechanics Approach for Assessing the Strength of Bonded Lap Joints

2011 ◽  
Vol 471-472 ◽  
pp. 1075-1080 ◽  
Author(s):  
Philipp Weißgraeber ◽  
Wilfried Becker
Keyword(s):  
Fracture Mechanics ◽  
Energy Release ◽  
Optimization Problem ◽  
Strength Criterion ◽  
Lap Joints ◽  
Reliable Prediction ◽  
New Approach ◽  
Single Lap Joints ◽  
Finite Fracture Mechanics ◽  
Failure Loads

For the widespread use of adhesive joints an exact and reliable prediction of the strength is mandatory. In this work, a new approach to assess the strength of single lap joints is presented. The approach is based on the hybrid criterion as postulated by Leguillon in the framework of finite fracture mechanics. It strictly combines a consideration of an energy release balance and a fulfillment of a strength criterion. The present work is based on a simple model of the joint behavior and assumptions about crack initiation. From the stress distribution of the classical shear lag theory an incremental energy release rate is derived and is used to formulate the optimization problem of the failure load. The resulting predictions of critical failure loads are compared to experimental results of single lap joints. It is shown that the new approach is able to physically describe crack formation and the corresponding critical load within the framework and limitations of the underlying assumptions and simplifications. The work closes with a discussion of the limitations and an outlook on possible improvements of the underlying models and assumptions.

Experimental Investigation of Metallic Fiber-Reinforced Adhesively Bonded Joints under Bending

2017 ◽  
Vol 754 ◽  
pp. 252-255
Author(s):  
S.M.J. Razavi ◽  
F. Berto
Keyword(s):  
Adhesive Layer ◽  
Longitudinal Direction ◽  
Lap Joints ◽  
Experimental Investigations ◽  
Adhesively Bonded ◽  
Load Bearing ◽  
Single Lap Joints ◽  
Bonded Joint ◽  
Failure Loads ◽  
Fibers Orientation

In the current paper, the geometric and material parameters of metal fibers utilized for strengthening adhesively bonded single lap joints under flexural loading were investigated by using experimental investigations. According to the test results, incorporating metal fibers in the adhesive layer of a bonded joint can have a significant impact on the flexural load bearing of the joint. The distance between the fibers and also the fibers orientation were considered as the key parameters in this research. It was concluded that the load bearing of the joint can be improved by reducing the distance between the fibers and the highest failure loads were obtained for the joints reinforced by fibers in the longitudinal direction.

Analytical model for harmonic response of dissimilar single-lap joints

2017 ◽  
Vol 232 (4) ◽  
pp. 457-472 ◽  
Author(s):  
Mohamed O Gafar ◽  
Khalid H Almitani ◽  
Ramzi Othman
Keyword(s):  
Analytical Model ◽  
Adhesive Bonding ◽  
Natural Frequencies ◽  
Transfer Functions ◽  
Lap Joints ◽  
Analytical Models ◽  
Main Concern ◽  
Element Analysis ◽  
Harmonic Response ◽  
Single Lap Joints

Adhesive bonding is increasingly used in automobile, marine and aeronautical structures. The dynamic response of adhesively bonded joints is therefore a main concern. This paper deals with the harmonic response of single-lap joints. A closed-form analytical solution is derived to account for the case of joints with dissimilar substrates. The transfer functions predicted by the analytical model match well the transfer functions predicted by a two-dimensional finite element analysis, and so do the natural frequencies. The numerical and analytical models show that the natural frequencies are sensitive to the order of substrates. Mainly, fixing the end of the stiffer substrate leads to natural frequencies that are mostly higher than those which are obtained by fixing the end of the softer substrate.

Strength of RTM Single Lap Joints with Transverse Stitching

1997 ◽  
Vol 137 ◽  
pp. 195-202 ◽  
Author(s):  
L. Tong ◽  
K. Cleaves ◽  
T. Kruckenberg ◽  
G.P. Steven
Keyword(s):  
Lap Joints ◽  
Single Lap Joints ◽  
Transverse Stitching
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