Biaxial stress concentration of pultruded GFRP perforated plate considering anisotropic factor

Structures ◽  
2021 ◽  
Vol 33 ◽  
pp. 2803-2810
Author(s):  
Zhihua Xiong ◽  
Chenyu Zhao ◽  
Yuqing Liu ◽  
Haohui Xin ◽  
Yang Meng
Keyword(s):  
Stress Concentration ◽  
Perforated Plate ◽  
Biaxial Stress ◽  
Anisotropic Factor

An Analysis of Power Law Viscous Materials Under a Plane-Strain Condition Using Complex Stream and Stress Functions

1981 ◽  
Vol 48 (3) ◽  
pp. 486-492 ◽  
Author(s):  
Y. S. Lee ◽  
L. C. Smith
Keyword(s):  
Stress Concentration ◽  
Stream Function ◽  
Power Law ◽  
Stress Concentration Factor ◽  
Stress Function ◽  
Concentration Factor ◽  
Viscous Medium ◽  
Biaxial Stress ◽  
Deformation Analysis ◽  
Axially Symmetric

The equilibrium and compatibility equations for nonlinear viscous materials described by the power law are solved by introducing the complex stream and stress function. The stresses, strain rates, and velocities derived from the summation form of the stream function and the product form of the stress function are identical to the results obtained from the axially symmetric field equation. The stream function solution is used in the deformation analysis of a viscous hollow cylindrical inclusion buried in an infinitely large viscous medium assuming an equal biaxial boundary stress. The stream function approach is used in determining the stress-concentration factor for a cavity in a viscous material subject to the identical boundary biaxial stress. The results agree with the results of Nadai. The effect of the strain-rate-hardening exponent, the geometry of the inclusion, and the material constants on the hoop stress-concentration factor in the interface between the inclusion and the matrix are discussed.

scholarly journals Research of Maximum Stress Zones in Circular Plates with Loades Concentrated Force

2020 ◽  
Vol 70 (2) ◽  
pp. 77-90
Author(s):  
Konieczny Mateusz ◽  
Achtelik Henryk ◽  
Gasiak Grzegorz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Maximum Stress ◽  
Perforated Plate ◽  
Chemical Equipment ◽  
Circular Plates ◽  
The Finite Element Method ◽  
Concentrated Force ◽  
State Of Stress

AbstractThe paper presents numerical and experimental analysis of the state of stress in a circular perforated plate, free supported or fixed on entire premier and loaded concentrated force. This type of plate have found applications in the field of chemical equipment, pressure tanks and box conveyors. The use of the finite element method for numerical calculations enables accurate location of stress concentration zones in a perforated plate and allows to determine stress values around these hole.

Stress and Strain Locus of Perforated Plate in Inelastic Deformation: Strain-Controlled Loading Case

2010 ◽  
Author(s):  
Osamu Watanabe ◽  
Bopit Bubphachot ◽  
Akihiro Matsuda
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Cyclic Loading ◽  
Hold Time ◽  
Perforated Plate ◽  
Inelastic Strain ◽  
Stress And Strain ◽  
Element Analysis ◽  
Simplified Method ◽  
Loading Case

Plastic strain of structures having stress concentration is estimated by using the simplified method or the finite element elastic solutions. As the simplified methods used in codes and standards, we can cite Neuber’s formula and elastic follow-up procedure. Also we will cite stress redistribution locus (abbreviated as SRL) method recently proposed as the other simplified method. In the present paper, inelastic finite element analysis of perforated plate, whose stress concentration is about 2.2∼2.5, is carried out, and stress and strain locus in inelastic range by the detailed finite element solutions is investigated to compare accuracy of the simplified methods. As strain-controlled loading conditions, monotonic loading, cyclic loading and cyclic loading having hold time in tension are assumed. The inelastic strain affects significantly life evaluation of fatigue and creep-fatigue, and the stress and strain locus is discussed from the detailed inelastic finite element solutions.

Fatigue Test for Two-Holes Diagonally-Placed Plate at Elevated Temperature

2012 ◽  
Author(s):  
Keisuke Kinoshita ◽  
Osamu Watanabe
Keyword(s):  
Elevated Temperature ◽  
Stress Concentration ◽  
Crack Initiation ◽  
Perforated Plate ◽  
Ccd Camera ◽  
Inelastic Strain ◽  
Local Strain ◽  
Stress Concentrations ◽  
Two Circular Holes ◽  
Circular Holes

The objective of the present study is to evaluate fatigue strength of a perforated plate at an elevated temperature of 550°C under displacement-controlled loading. Specimens having two circular holes have stress concentrations near the hole sides. The two holes in the specimen made of SUS304 stainless steel are placed at an angle of 30°, 60° and 90° measured from the loading direction. Stress concentration factors of these specimens, having the complicated stress pattern distribution, were estimated by the finite element method (FEM). Based on the stress concentration factor, the inelastic strain was estimated by the simplified equation of the Stress Redistribution Locus (SRL) method, and the estimated strain was compared to the experimental Best Fit Fatigue (BFF) curve. Crack initiation cycles were determined from graph showing the crack propagation process, which were measured by a CCD camera at a regular interval cycle. Crack initiation cycles were smaller than failure cycles of 75% load decreasing point. By using these inelastic local strain and crack initiation cycles, the experimented results were predicted well by the present complicated structures.

Fatigue Strength Evaluation of Perforated Plate at Elevated Temperature Using Stress Redistribution Locus Method

2007 ◽  
Author(s):  
Osamu Watanabe ◽  
Bopit Bubphachot ◽  
Nobuchika Kawasaki ◽  
Naoto Kasahara
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Crack Initiation ◽  
Perforated Plate ◽  
Local Strain ◽  
Stress Redistribution ◽  
Experimental Results ◽  
Locus Method ◽  
Crack Initiation Life

This study reports the experimental results carried out at the elevated temperature of 550°C on fatigue strength of the perforated plate. Stress Redistribution Locus (abbreviated as SRL hereafter) Method is applied to predict fatigue life for the specimens having stress concentration. The specimens made of SUS304 stainless steel have through holes with different number and different diameter, accordingly leading to the different stress concentration condition. The inelastic local strain is estimated by the SRL method or the other previous Neuber’s rule, and compared to the experimental results on the crack initiation life at the edge of the hole using the concentrated local strain obtained by these methods. The obtained result is that the SRL method is best used with the onset of failure or crack initiation.

Numerical Analysis of the Effect of Added Hole on the Stress Concentration of a Perforated Plate and Determining of Its Optimum Location

2010 ◽  
Vol 452-453 ◽  
pp. 793-796
Author(s):  
Mohammad Reza Khoshravan ◽  
A. Khalili ◽  
M.J. Razavi
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Perforated Plate ◽  
Base Plate ◽  
Longitudinal Axis ◽  
Finite Element Software ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Different Diameters ◽  
Good Agreement

The aim of this work was to investigate Stress Concentration Factor (SCF) variations induced by adding of holes in a perforated base plate subjected to uniaxial tension load, using Finite Element Method (FEM). Analyses were applied in 2D for different diameters, orientation angels and distances of added holes from the base hole. A parametric model in ANSYS finite element software was used to calculate the SCFs and the differences between SCFs have been shown in various graphs. To investigate the variation of SCF in perforated base plate, two holes with the same diameter were located symmetrically to the longitudinal axis with different angles and distances from the base hole. The results showed that by adding holes with a proper diameter, orientation angles and distances from the base hole, the SCFs can be reduced. Using the obtained graphs and corresponding to the base hole diameter the most adequate diameter and its position was determined. Obtained results for special statuses had a good agreement with the graphs of Peterson’s stress concentration factors.

Crack Initiation/Propagation of Perforated Plate Under Displacement-Controlled Creep-Fatigue Test at Elevated Temperature

2012 ◽  
Author(s):  
Osamu Watanabe ◽  
Taisuke Akiyama ◽  
Akihiro Matsuda
Keyword(s):  
Elevated Temperature ◽  
Stress Concentration ◽  
Crack Growth ◽  
Fatigue Test ◽  
Perforated Plate ◽  
The Other ◽  
Severe Stress ◽  
Multiple Origins ◽  
Creep Fatigue ◽  
Different Diameters

In structures having stress concentration under cyclic and holding loading, a small crack initiates and it grows and propagates. The present paper shows the experimental results of the perforated plate having the different diameters and the prescribed different strain amplitude. In the specimens having a circular hole, a crack initiates at the hole side having the most severe stress concentration in the specimen, and then the other crack also starts to initiate at the opposite hole side. Growth of both cracks is observed from the photographs taken at each cycle to study the relation between crack growth and load decrease. The feature of crack growth initiating of creep-fatigue test from multiple origins will be discussed for those of fatigue test.

Creep-Fatigue Life Evaluation Method for Perforated Plates at Elevated Temperature

2005 ◽  
Vol 128 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Osamu Watanabe ◽  
Takuya Koike
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Evaluation Method ◽  
Three Dimensional ◽  
Perforated Plate ◽  
Dimensional Structure ◽  
Creep Process ◽  
Plastic Behavior ◽  
Creep Fatigue

The accurate evaluation scheme for creep-fatigue strength is one of the continuing main issues for elevated temperature design; particularly, the three-dimensional structure having stress concentration is becoming more important. The present paper investigates fatigue strength and creep-fatigue strength of perforated plate having stress concentration as an example. The specimens are made of type 304 SUS stainless steel, and the temperature is kept to 550°C. The whole cycles of the experiment record are analyzed, and the characteristics of the structure having stress concentration are discussed. The present paper employs stress redistribution locus (abbreviated as SRL) in evaluation plastic behavior in cyclic fatigue process as well as stress relaxation in creep process, and the feasibility is discussed in conjunction with the comparison to experimental results.

Sign in / Sign up

Export Citation Format

Share Document