scholarly journals Harmfulness Defect in Double-Notched Specimen of S533 Steel

2020 ◽  
Vol 9 (4) ◽  
pp. 2287-2293
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Methods ◽  
Propagation Velocity ◽  
Test Specimen ◽  
Crack Opening ◽  
Concentration Coefficient ◽  
Notched Specimen ◽  
Crack Propagation Velocity ◽  
Stress Concentration Coefficient

The analytical solving of fracture mechanics equations remains insufficient for complex mechanisms, hence the use of finite element methods (FEM). The paper considered a test specimen with double S355 steel notches, stressed in tension, causing crack opening with two planes of symmetry. The refinement of the mesh is carried out at the bottom of the notch using the elements of Barsoum. The stress concentration coefficient and the crack propagation velocity are evaluated.

Finite Element Calculation about Stress Concentration Coefficient of Welded Butt Joints of Magnesium Alloy

2014 ◽  
Vol 989-994 ◽  
pp. 935-938
Author(s):  
Ying Xia Yu ◽  
Bo Lin He ◽  
Xiao Dong Zhang ◽  
Si Yong Lei
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Inclination Angle ◽  
Fatigue Property ◽  
Concentration Coefficient ◽  
Butt Joints ◽  
Welded Structures ◽  
Weld Toe ◽  
Weld Edge ◽  
Stress Concentration Coefficient

Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld toe inclination angle θ and weld edge transition arc radius r on the stress concentration coefficient of welded butt joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the two parameters was also researched. The calculation results indicate that reducing weld toe inclination angle or increasing transition arc radius can effectively decrease the stress concentration coefficient of welded butt joints, so as to improve the fatigue property of welded structures. For the safe use of welded structures, the true weld edge transition arc radius r should be greater than 3mm, and weld toe inclination angle θ should be smaller than 30°.

On Stress Concentration Character at the Abnormal Cross-Section of the Concentric Shaft with Bigger Diameter Ratio

2007 ◽  
Vol 353-358 ◽  
pp. 2762-2765
Author(s):  
Zhi Xin Han ◽  
Shao Feng Wang ◽  
Jin Xia Du ◽  
Bing Liu
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Cross Section ◽  
Diameter Ratio ◽  
Concentration Coefficient ◽  
3D Finite Element ◽  
Computing Model ◽  
Stress Concentration Coefficient

Aiming at the concentric shaft of the abnormal cross-section where there are two types of the concave fillet and the convex fillet and whose diameter ratio is bigger than 2, a 3D finite element computing model was constructed, and the stress and the strain is computed by means of software ANSYS8.0, and a stress concentration coefficient graph is found through comparing the result computed by FEM and by the method of material mechanics. It is concluded that the most important factors effecting the stress concentration are the type and radius of the transition fillet.

Study on the Relationship between the Diameter and the Stress Concentration

2014 ◽  
Vol 915-916 ◽  
pp. 165-168
Author(s):  
Jian Qin Zhao ◽  
Zhi Wang
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Concentration Coefficient ◽  
Test Technique ◽  
Finite Element Technology ◽  
Concentration Degree ◽  
Relief Groove ◽  
The Relationship ◽  
Stress Concentration Coefficient

In order to find out how much a relief groove can change the stress distribution in a shaft, In this paper, finite element technology and test technique have been used to study the stress concentration dates caused by a escape by different shaft models. Their diameters are all less than M30mm. The research solutions show that the stress concentration coefficients caused by the escapes grow with the increase of the diameters. The pressure on the shaft should be reduced to about 0.68 times of the normal one so that the shafts have the same lifetime as before. Stress concentration coefficient is the only parameter to estimate the stress concentration degree. The calculate dates were compared with the test one in this paper in order to check the models accuracy. The conclusions show that the error rate is less than 5%.It can be taken as a new method to replace the destructive test in the design products.

Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

2013 ◽  
Vol 456 ◽  
pp. 451-455
Author(s):  
Jun Yang ◽  
Bo Li ◽  
Qiang Jia ◽  
Yuan Xing Li ◽  
Ming Yue Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Welded Joints ◽  
Weld Zone ◽  
Fatigue Property ◽  
Concentration Coefficient ◽  
5083 Aluminum Alloy ◽  
Stress Concentration Coefficient

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

scholarly journals Stress strain state of elastic plate with elliptical cut-out

2020 ◽  
pp. 3-8
Author(s):  
E.E. Deryugin ◽  
Keyword(s):  
Plastic Deformation ◽  
Stress Concentration ◽  
Driving Force ◽  
Strain State ◽  
Mechanical State ◽  
Concentration Coefficient ◽  
Stress Strain ◽  
Crack Driving Force ◽  
Stress Strain State ◽  
Stress Concentration Coefficient

The article considers a crack in the form of a narrow cut with a certain cfn at the cut out in an unbounded plate. The characteristics of the mechanical state of this system under uniaxial loading are determined: the stress concentration coefficient, the crack-driving force, and the energy of a solid with a crack. The elastic energy expenditure during crack propagation is determined. The general regularities of the mechanical state of a solid with a crack, not necessary having the form of an ellipse, are revealed. An important parameter of a crack is the curvature at the tip. It is shown that the Griffiths crack does not actually have a singularity at the tip. The stress strain state of the plate with an elliptical crack is identical to the same of the plate with a focus of homogeneous plastic deformation.

A new method of measuring the stress concentration coefficient

2012 ◽  
Vol 28 (6) ◽  
pp. 436-440
Author(s):  
Krzysztof Kwieciński ◽  
Robert Jachym ◽  
Krzysztof Krasnowski
Keyword(s):  
Stress Concentration ◽  
New Method ◽  
Concentration Coefficient ◽  
Stress Concentration Coefficient

A Crack Detection Technique for Use With Brittle Materials

1986 ◽  
Vol 108 (3) ◽  
pp. 232-235 ◽  
Author(s):  
W. S. Sampath ◽  
T. C. Ramaraj ◽  
M. C. Shaw
Keyword(s):  
Crack Initiation ◽  
Propagation Velocity ◽  
Crack Detection ◽  
Gold Film ◽  
Crack Opening ◽  
Electrical Conductance ◽  
Brittle Materials ◽  
Metal Foil ◽  
Engineering Structures ◽  
Crack Propagation Velocity

Crack gages are sensors designed to monitor crack initiation and growth in engineering structures by alteration of electrical conductance. Present gages involve a thick (5 μm) metal foil on an even thicker polymer substrate and are not suitable for use on brittle materials where the crack opening is small. The new technique employs a very thin (300 Å) gold film sputtered on a nonconducting brittle specimen. The method also enables crack propagation velocity to be estimated.

Research of Fatigue Limit and Stress Concentration on Structural Steel with Double-Notches

2009 ◽  
Vol 419-420 ◽  
pp. 849-852
Author(s):  
Sheng Wu Wang ◽  
Shu Juan Sun ◽  
Ai Ling Wen ◽  
Wei Da Wang ◽  
Shinichi Nishida
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Fatigue Limit ◽  
Three Dimensional ◽  
Fatigue Tests ◽  
Notched Specimen ◽  
Blind Hole ◽  
Element Method

The fatigue limit of parts and components that have the multi-notches is important data for the design and manufacture of machinery and traffic equipment which are operated under the high speed or pressure. In this paper the rotating bending fatigue tests have been carried out to investigate the fatigue limit of specimen with double-notch that is constructed of step and blind hole, and analyzed the effect of stress concentrations at the double-notched bottoms on the fatigue limits, using three-dimensional elastic finite element method. Firstly, the fatigue tests of 8 group specimens have been performed for examining the of fatigue limits of the single-notched specimen and double-notched specimen, respectively. Additionally, the stress field interactions between two stress fields by the blind hole notch and step are discussed using three-dimensional elastic finite element method. The main results obtained in this study are as follows: The fatigue limit of the double-notched specimen are down comparison with the fatigue limit of the single-notched specimen; the fatigue limit of the double-notch specimen is insensitive to distance between the blind hole and step for the low carbon structure steel with better ductility; for the high-strength steel, superposition and intensification of the stress concentration by the blind hole and step mutually may be avoided so that their adverse effects on the fatigue strength may be become to minimize, as take appropriate distance between the blind hole and step. The results are significant for the design of engineering design of the multi-notched parts, and the study of fatigue strength.

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