The Effect of Adhesive for Fillet on Stress in Weld-Bonded Joints

2010 ◽  
Vol 450 ◽  
pp. 502-505 ◽  
Author(s):  
Min You ◽  
Jia Ling Yan ◽  
Xiao Ling Zheng ◽  
Nan Feng Xiong ◽  
Ding Feng Zhu
Keyword(s):  
Elastic Modulus ◽  
High Stress ◽  
Bonded Joints ◽  
Longitudinal Stress ◽  
Lap Joint ◽  
Load Bearing Capacity ◽  
High Stress Region ◽  
Single Lap Joint ◽  
Stress Region ◽  
Peak Value

The influence of the fillet with different elastic modulus on the stress distributed in weld-bonded aluminum alloy single lap joint was investigated using elasto-plastic finite element method. The results show that the peak values of the stress along the mid-bondline at the points near the fillet edge were increased as the elastic modulus of the fillet increased. But at points near the both ends of the adherend in over lap zone as well as in the region of the nugget the peak stresses were decreased except longitudinal stress Sx. The peak value of Seqv decreased first, and then it increased again as the elastic modulus in fillet increased. The load-bearing capacity of the whole weld-bonded joints may be improved for the fillet with Adhesive B (825 MPa) for the relative high stress region in nugget was wider and the stress distribution in overlap zone was more uniform.

The Effect of Fillet Geometry on Stress in Weld-Bonded Joints

2010 ◽  
Vol 97-101 ◽  
pp. 767-770 ◽  
Author(s):  
Jia Ling Yan ◽  
Min You ◽  
Xiao Ling Zheng ◽  
Ding Feng Zhu ◽  
Mei Rong Zhao
Keyword(s):  
Finite Element Method ◽  
Stress Distribution ◽  
Adhesive Layer ◽  
Bonded Joints ◽  
Lap Joint ◽  
Load Bearing Capacity ◽  
Single Lap Joint ◽  
Reducing Stress ◽  
Peak Value ◽  
Alloy Weld

The influence of fillets with different geometry shape on the stress distribution in aluminum alloy weld-bonded single lap joint was investigated using elasto-plastic finite element method (FEM). The results show that it is advantageous of reducing stress concentration in adhesive layer near the ends of the lap zone in single lap weld-bonded aluminum joints and part of the stress transferring from adhesive layer to the nugget when the joints with a couple of right triangle fillets over other shapes. The load-bearing capacity of the whole weld-bonded joints may be improved. The full-triangular fillet is recommended that it be more advantageous of decreasing the stress peak value and making the stress distribution in overlap zone more uniform.

Effect of Restraint Condition on the Thermal Stress in the Bonded Single Lap Joint

2011 ◽  
Vol 230-232 ◽  
pp. 1345-1349 ◽  
Author(s):  
Cun Jun Chen ◽  
Min You ◽  
Hai Zhou Yu ◽  
Jian Li Li ◽  
Chun Zhi Mei
Keyword(s):  
Finite Element Method ◽  
Thermal Stress ◽  
Thermal Shock ◽  
Thermal Stresses ◽  
Longitudinal Stress ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Single Lap Joint ◽  
Peel Stress ◽  
Peak Value

The temperature field in the adhesively bonded single lap steel joint after a thermal shock (100 °C, 10s) and the influence of the restraint on the thermal stress in the joint was investigated using elasto-plastic finite element method (FEM). The results showed that the temperature in the overlap region is symmetrically distributed to the bondline after the thermal shock. Five kinds of constraints were applied in the study and it is found that the peak value of the thermal stresses were occurred at the points near the free ends of the adherend lap zone along the mid-bondline under the action of constraining the adherends in the direction of both transversal and longitudinal. The symbol of the longitudinal stress Sx and peel stress Sy is negative.

scholarly journals Effects of Organophosphate Insecticides on Mechanical Properties of Rat Aorta

2011 ◽  
pp. 39-46 ◽  
Author(s):  
B. GUVENC TUNA ◽  
N. OZTURK ◽  
U. COMELEKOGLU ◽  
B. C. YILMAZ
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Thoracic Aorta ◽  
High Stress ◽  
Chronic Administration ◽  
Female Rats ◽  
Control Group ◽  
Stress Strain ◽  
High Stress Region ◽  
Stress Region

The present study was carried out to search whether organophosphate pesticides affect the mechanical properties of the thoracic aorta. Wistar female rats (aged 6-8 weeks) were assigned randomly to a control group and groups treated with either dichlorvos or chlorpyriphos for 90 days at a dose of 5 mg/kg/day. After that period, animals were killed and thoracic aorta strips in longitudinal direction were isolated. The stress, strain and elastic modulus were obtained from the strips. Our results showed that chronic administration of chlorpyriphos and dichlorvos caused downward shift of the stress-strain relations compared to the control curve. The elastic modulus-stress curve revealed distinct characteristics in the low and high stress regions. A power function was used to simulate the low stress region while a line was fit to the high stress region. Curve fitting procedure illustrated that both pesticides influenced mainly the high stress region, but they had diverse effects at the low stress region. The results also imply that chlorpyriphos and dichlorvos decrease the strength of the aorta and therefore might influence the response of the aorta to mechanical loading induced by blood pressure.

The Crack Arrest Capability of 9-Percent Ni Steels (ASTM 553, Type 1) LNG Storage Tanks

1991 ◽  
Vol 113 (3) ◽  
pp. 380-384
Author(s):  
P. B. Crosley ◽  
E. J. Ripling
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
High Stress ◽  
Crack Arrest ◽  
Storage Tanks ◽  
Membrane Stress ◽  
High Stress Region ◽  
Fast Running ◽  
Stress Region

Safety of structures can be assured, even if cracks initiate in localized regions of abnormally low toughness, and/or abnormally high stress (LT/HS), if the materials from which they are fabricated have a high enough crack arrest fracture toughness. When this requirement is met, fast-running cracks that initiate in LT/HS regions arrest when their tip encounters material having normal toughness and stresses. The work described in this paper was carried out to determine the crack arrest capability of LNG storage tanks by determining the longest LT/HS region in which a crack could initiate and still arrest when it leaves this region. The determination consisted of relating a fracture analysis with the measured full-thickness crack arrest fracture toughness of three 9-percent Ni plates which were reported in reference [1]. The calculations used a residual stress pattern, produced by welding, superimposed on a typical membrane stress. The residual stress was selected as an example of a localized high stress region. It was found that tanks built from the poorest of the three tested plates could arrest cracks about 3/4 m long, while tanks built from the two tougher plates could arrest cracks almost 2 m long.

X-Ray Stress Determination in a Single Lap- Joint Containing a Debonded Region*

1985 ◽  
Vol 29 ◽  
pp. 57-62
Author(s):  
A. Lankford ◽  
C. S. Barrett ◽  
Paul Predecki
Keyword(s):  
Joint Interface ◽  
X Rays ◽  
Bonded Joints ◽  
Lap Joint ◽  
Finite Element Program ◽  
X Ray ◽  
Single Lap Joint ◽  
Element Program ◽  
Adhesive Bonded Joints ◽  
Gain Access

XRD has been found to be a useful technique for investigating both surface and interior stresses in. adhesive bonded joints. For the interior stresses, to gain access to the joint interface, adherends were chosen such that one adherend was relatively transparent to the X-radiation used and the other was not. Incident X-rays then penetrated the first adherend and the adhesive, and were diffracted from just below the surface of the second adherend.In prior work it was shown that the measured stresses due to an applied load agreed quite well with stresses calculated for the same joint using the TEXGAP-2D finite element program, except at one extremity of the bond. One explanation proposed for the discrepancy was that a small debond was present at this extremity. In the present study, therefore, an investigation was made of a joint contfli'nitig an intentional debond at this extremity.

scholarly journals Viscoelastic Analysis of Adhesively Bonded Joints

1981 ◽  
Vol 48 (2) ◽  
pp. 331-338 ◽  
Author(s):  
F. Delale ◽  
F. Erdogan
Keyword(s):  
Adhesive Layer ◽  
Shear Loading ◽  
Bonded Joints ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Viscoelastic Analysis ◽  
Laplace Transform Technique ◽  
External Loads ◽  
Peak Value

In this paper an adhesively bonded lap joint is analyzed by assuming that the adherends are elastic and the adhesive is linearly viscoelastic. After formulating the general problem a specific example for two identical adherends bonded through a three parameter viscoelastic solid adhesive is considered. The standard Laplace transform technique is used to solve the problem. The stress distribution in the adhesive layer is calculated for three different external loads namely, membrane loading, bending, and transverse shear loading. The results indicate that the peak value of the normal stress in the adhesive is not only consistently higher than the corresponding shear stress but also decays slower.

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