Abstract
This paper examines the failures and strengths of joints bonded by a Neoxil CE92 N8 adhesive at different overlap lengths and different taper angles. The study was carried out both as experimental and numerical. In the experimental stage, lap-shear tests on Single-Lap Joints (SLJs) with different taper angles and overlap lengths were conducted. The stress analyses in the SLJs were obtained using a linear Finite Element Analysis (FEA) in numerical stage. It is assumed that adhesive and adherend have both geometrical nonlinearity and linear material behaviour. Scrutinising carefully the surfaces of the SLJs, two different failure types, cohesive failures (CF) and special cohesive failures (SCF) were observed. The obtained numerical results were compared with experimental ones. Results indicate that the increasing of both overlap length and taper angle increase the joint strength and, in particular, the highest strength values in all joint geometries are attained by specimens having a taper angle of 15°.
Highlights
During the past two decades or so, important progress has been witnessed in composite materials and their production methods
Avila et al studied the stress analysis of the wavy-lap joint in composites. Based on both experiments and Finite Element Analysis (FEA), they determined a 41% increase in the load capacity and found out that this increase was caused by compressive stresses areas which occur in the wavy-lap joints [11].Lang and Mallick examined the effect of different spew shapes on the stress distribution and maximum stress by examining different spew geometries at a Single-Lap Joints (SLJs) [12].Using two-dimensional FEA, Özel et al examined the elasto-plastic stress analysis of SLJs subject to a bending moment in SLJs with very different mechanic properties from each other consisting of the hardened steal bonded material and two adhesives, one of which was stiff and the other was flexible
This paper presents an approach using linear FEM to estimate the failure and strength of joints bonded by a stiff adhesive (Neoxil CE92 N8) with different overlap lengths and different taper angles
Summary
During the past two decades or so, important progress has been witnessed in composite materials and their production methods. Based on both experiments and FEA, they determined a 41% increase in the load capacity and found out that this increase was caused by compressive stresses areas which occur in the wavy-lap joints [11].Lang and Mallick examined the effect of different spew shapes on the stress distribution and maximum stress by examining different spew geometries at a SLJs [12].Using two-dimensional FEA, Özel et al examined the elasto-plastic stress analysis of SLJs subject to a bending moment in SLJs with very different mechanic properties from each other consisting of the hardened steal bonded material and two adhesives, one of which was stiff and the other was flexible They observed that the adhesive thickness had critical effect on the joint strength and argued that the load borne by the SLJ bonded by an adhesive with the capability of changing high shape increase with increasing overlap length [13].Aydin et al presented a new approach by using nonlinear FEA for determining the failure type and strength of a joint bonded by a film type of adhesive. An Experimental and Numerical Study on The Effects of Taper Angles 161 and Overlap Length on the Failure geometrical non-linearity and linear material behaviours of adhesive and adherend by using the linear FEA; FEA results were compared with experimental results as the final step
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