A Study on Evaluation of Impact Strength of Adhesive Joints Subjected to Impact Shear Loadings

2008 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Toshimasa Nagai ◽  
Takeshi Iwamoto ◽  
Hideaki Kuramoto
Keyword(s):  
Impact Strength ◽  
Adhesive Joint ◽  
Static Loading ◽  
Split Hopkinson Pressure Bar ◽  
Shear Loading ◽  
Adhesive Joints ◽  
Stress Distributions ◽  
Adhesive Thickness ◽  
The Impact ◽  
Strength Of Adhesive Joints

Adhesive joints in mechanical structures are subjected to static loading as well as impact loading. It is desired for the adhesive joints to have sufficient strength under both static and impact loadings. A lot of studies on the adhesive joints and the joint strength subjected to static loading have been carried out and examined. A few research works on the adhesive joint subjected to dynamic loading have been done, however, it has not fully elucidated for applying the joints to important sections in mechanical structures. In this study, the impact strength of adhesive joints subjected to impact shear loading is investigated using modified split Hopkinson pressure bar (SHPB) apparatus. The shear strength of adhesive joint, in which a solid cylinder is bonded to a hollow cylinder by an adhesive, is determined from maximum applied shear stress. A commercial thermosetting epoxy adhesive is used in the experiments. At the same time, the stress distributions in the joints subjected to impact shear loading are simulated by the finite-element analyses (FEA). The effect of adhesive thickness is investigated experimentally and computationally. It is shown that the strength is greatly affected by the adhesive thickness and the effect on the stress distributions in the joint is discussed.

Finite Element Stress Response Analysis of Stepped-Lap Adhesive Joints of Similar Adherends Under Impact Tensile Loadings

2003 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Takahiro Oomori ◽  
Kohei Ichikawa ◽  
Shoichi Kido
Keyword(s):  
Finite Element ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Adhesive Joints ◽  
Response Analysis ◽  
Stress Distributions ◽  
Maximum Value ◽  
Adhesive Thickness ◽  
Stress Variations ◽  
The Impact

The stress variations and stress distributions in stepped-lap adhesive joints of similar adherends under impact tensile loadings were analyzed in elastic range using three-dimensional finite element method (DYNA3D). The impact loadings were applied to the lower adherend by dropping a weight. The stress distributions in stepped-lap adhesive joints of similar adherends under static tensile loadings were also analyzed using FEM (MARC). The effects of Young’s modulus of the adherends, the adhesive thickness, and a number of steps in the adherends on the stress variations and the stress distributions at the interfaces between the adherends and the adhesive were examined under both impact and static loadings. As the results, it was found that (1) the maximum value of the maximum principal stress σ1 occured at the outside edge of the butted interface between the adhesive and the lower adherend to which impact loadings were applied; (2) The maximum value of stress σ1 increased as Young’s modulus of the adherends increased; (3) The maximum value of stress σ1 increased as the adhesive thickness decreased, and it increased at the butted parts of joints as the adhesive thickness decreased. The maximum value of stress σ1 increased at the lapped parts of joints as the adhesive thickness increased; (4) The maximum value of stress σ1 increased as the numbers of steps in the adherends increased. The characteristic of the joints under static loadings were also clarified. In addition, the experiments to measure the strain response of joints subjected to impact tensile loadings were carried out using strain gauges. A fairly good agreement was found between the numerical and the measured results concerning the strain responses.

scholarly journals The Influence of the Joint Thickness Upon the Impact Strength of Block Adhesive Joints

2018 ◽  
Vol 35 ◽  
pp. 80-89
Author(s):  
Andrzej Komorek ◽  
Jan Godzimirski ◽  
Wojciech Kucharczyk
Keyword(s):  
Impact Strength ◽  
Adhesive Joints ◽  
Joint Thickness ◽  
The Impact

606 Impact Strength of Adhesive Joints under High Temperature

2000 ◽  
Vol 2000.8 (0) ◽  
pp. 191-192
Author(s):  
Koichiro KIHARA ◽  
Shu AKABANE ◽  
Hiroaki ISONO ◽  
Toshio SUGIBAYASHI
Keyword(s):  
High Temperature ◽  
Impact Strength ◽  
Adhesive Joints ◽  
Strength Of Adhesive Joints

Stress Analysis of Butt Adhesive Joints of Dissimilar Hollow Cylinders Under Impact Tensile Loadings

2002 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Yoshihito Suzuki ◽  
Shoichi Kido
Keyword(s):  
Young’S Modulus ◽  
Principal Stress ◽  
Young's Modulus ◽  
Maximum Principal Stress ◽  
Adhesive Joints ◽  
Inside Diameter ◽  
Adhesive Thickness ◽  
Hollow Cylinders ◽  
Stress Variations ◽  
The Impact

The stress variations in butt adhesive joints of dissimilar hollow cylinders under impact tensile loadings are analyzed in elastic and elasto-plastic deformation using a finite element method. The FEM code employed is DYNA3D. The effect of Young’s modulus of the adhesive, adhesive thickness and the inside diameter of the hollow cylinders and Young’s modulus ratio between dissimilar adherends on the stress variations at the interfaces are examined. In addition, a process in rupture at the interface of the joint is analyzed. The stress distributions in the joints under static loadings are also analyzed by an FEM. The characteristics of the stress variations in the joints under impact loadings are compared with those in the joints under the static loadings. Also, the joint strenths under impact loadings are estimated. As the results, it is found that the maximum value of the maximum principal stress σl occurs at the outside of the interface. It is also found that the maximum principal stress σl at the interface decreases as the inside diameter of the hollow cylinders increases. The characteristics of the joints subjected to the impact loadings are found to be opposite to those subjected to the static loadings. In addition, the experiments were carried out to measure the strain response of the butt adhesive joints under impact tensile loads using strain gauges. Furthermore, the joint strengths under impact loadings were measured. Fairly good agreements are observed between the numerical and the measured results.

Effect of Adhesive Thickness and Bonding Length on Behavior of Composite Adhesive Joints Subject to Torsion

2007 ◽  
Vol 124-126 ◽  
pp. 1313-1316
Author(s):  
Je Hoon Oh
Keyword(s):  
Finite Element Analysis ◽  
Thermal Stresses ◽  
Failure Modes ◽  
Adhesive Joints ◽  
Design Parameters ◽  
Stress Distributions ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Adhesive Thickness ◽  
Bonding Length

Combined thermal and mechanical analyses were used to investigate the effect of joint design parameters such as the adhesive thickness and bonding length on stress distributions and torque capacities of tubular adhesive joints with composite adherends. The finite element analysis was employed to calculate the residual thermal stresses due to fabrication, and the mechanical stresses were analyzed using the nonlinear analysis of tubular adhesive joints. The analyses reveal that the stacking angle, adhesive thickness and bonding length have a significant influence on residual thermal stresses, and consequently failure modes and joint strengths.

scholarly journals An Experimental Investigation on the Behavior of Strain Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

2020 ◽  
Author(s):  
Ali A. Heravi ◽  
Oliver Mosig ◽  
Ahmed Tawfik ◽  
Manfred Curbach ◽  
Viktor Mechtcherine
Keyword(s):  
Shear Strength ◽  
Strain Hardening ◽  
Failure Modes ◽  
Split Hopkinson Pressure Bar ◽  
Tensile Load ◽  
High Energy ◽  
Shear Loading ◽  
Impact Compression ◽  
Split Hopkinson ◽  
The Impact

The ductile behavior of strain hardening cement-based composites (SHCC) under direct tensile load makes them promising solutions for applications where high energy dissipation is needed, such as earthquake, impact by a projectile, or blast. However, the superior tensile ductility of SHCC due to multiple cracking does not necessarily entail compressive and shear ductility. As an effort to characterize the behavior of SHCC under impact compressive and shear loading, relevant to the mentioned high-speed loading scenarios, the paper at hand studies the performance of a SHCC and its constituent cement-based matrices using the split-Hopkinson bar method. For compression experiments, cylindrical specimens with a length-to-diameter ratio (l/d) of 1.6 were used. The selected length of the sample led to similar failure modes under the quasi-static and impact loading conditions, which was necessary for a reliable comparison of the obtained compressive strengths. The impact experiments were performed in a split-Hopkinson pressure bar (SHPB) at a strain rate that reached 110 s-1 at the moment of failure. For shear experiments, a special adapter was developed for a split-Hopkinson tension bar (SHTB). The adapter enabled performing impact shear experiments on planar specimens using the tensile wave generated in the SHTB. Results showed a dynamic increase factor (DIF) of 2.3 and 2.0 for compressive and shear strength of SHCC, respectively. As compared to the non-reinforced constituent matrix, the absolute value of the compressive strength was lower for the SHCC. Contrarily, under shear loading, the SHCC yielded the higher shear strength than the non-reinforced matrix.

Finite Element Stress Response Analysis of Stepped-Lap Adhesive Joints Subjected to Impact Tensile Load

2000 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Takahiro Ohmori
Keyword(s):  
Finite Element ◽  
Wave Propagation ◽  
Principal Stress ◽  
Impact Load ◽  
Maximum Principal Stress ◽  
Adhesive Joints ◽  
Stress Wave Propagation ◽  
Maximum Value ◽  
Adhesive Thickness ◽  
The Impact

Abstract The stress wave propagation and the stress distribution in stepped-lap adhesive joints of similar adherends subjected to impact tensile loads and elastic deformation are analyzed using three-dimensional finite-element method (FEM). The impact load is applied to the joint by dropping a weight. One end of the upper adherend is fixed, and the other end of the lower adherend is subjected to an impact load. FEM code employed is DYNA3D. The effects of Young’s modulus of the adherends, the number of lapped steps, and the adhesive thickness on the stress wave propagation at the lapped, and fee butted interfaces are examined. It is also found that the maximum value of the maximum principal stress σ1 occurs at the end of the butted interface between the adhesive and the lower adherend to which the impact load is applied. As the number of the lapped steps increases, the maximum value of the maximum principal stress σ1 increases. It is found that the maximum value of the maximum principal stress σ1 increases as the adhesive thickness decreases. The maximum value of σ1 increases as Young’s modulus of the adherends increases. In addition, the experiments were carried out to measure the strain response of stepped-lap adhesive joints subjected to impact tensile loads using strain gauges. A fairly good agreement is seen between the analytical, and the experimental results.

Experimental Study of Impact Strength of Al-6063 Alloy Processed by Equal Channel Angular Extrusion

2014 ◽  
Vol 911 ◽  
pp. 158-162 ◽  
Author(s):  
Shamsuddin Sulaiman ◽  
J. Nemati ◽  
Hani Mizhir Magid ◽  
B.T.H.T. Baharudin ◽  
G.H. Majzoobi ◽  
...  
Keyword(s):  
Impact Strength ◽  
Equal Channel Angular Extrusion ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Angular Extrusion ◽  
Split Hopkinson ◽  
Ram Speed ◽  
Pressure Bar ◽  
The Impact ◽  
Strength Improvement

In the present study, the impact strength of annealed Al-6063 alloy developed by equal channel angular extrusion (ECAE), up to 6 passes at a temperature of 200°C following route A with a constant ram speed of 30 mm/min through a die angle of 90° between the die channels was investigated. The impact strength of extruded specimens is evaluated for different passes at a strain rate of 1800 s-1 using Split-Hopkinson pressure bar techniques. The results indicate that the major strength improvement occurs in the 5th and 6th passes while in primary passes, the strength improved but at a considerably lower rate. A total increasing in ultimate strength (UTS) and yield strength (YS) are 127% and 65% respectively and observed for the extruded material after 6 passes. Optical microscopic examinations show a grain refinement from 45 μm to 2.8 μm.

A Stress Analysis and Strength Estimation of Stepped Lap Adhesive Joints Under Static and Impact Tensile Loadings

2005 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Kohei Ichikawa
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Three Dimensional ◽  
Adhesive Joints ◽  
Stress Distributions ◽  
Maximum Value ◽  
Dimensional Finite Element ◽  
Static Tensile ◽  
Three Dimensional Finite Element ◽  
The Impact

The stress variations and stress distributions in stepped-lap adhesive joints of dissimilar adherends under impact tensile loadings were analyzed in elastic range using three-dimensional finite element method. The impact loadings were applied to the lower adherend by dropping a weight. The stress distributions in stepped-lap adhesive joints of dissimilar adherends under static tensile loadings were also analyzed using FEM. The effects of Young’s modulus of the adherends, the adhesive thickness and the number of butted steps of adherents ware examined under both impact and static loadings. As the results, The maximum value of stress σ1 increased as Young’s modulus of the adherends increased for the impact loadings. The maximum value of stress σ1 increased as the numbers of steps in the adherends increased for the static loadings. In addition, the experiments to measure the strain response of joints subjected to impact tensile loadings were carried out using strain gauges. A fairly good agreement was found between the numerical and the measured results concerning the strain responses.

Sign in / Sign up

Export Citation Format

Share Document