Stress concentrations close to circular holes in a cylindrical shell of medium thickness

1972 ◽  
Vol 4 (8) ◽  
pp. 923-925
Author(s):  
A. I. Zirka ◽  
L. L. Osaulenko ◽  
V. I. Savchenko
Keyword(s):  
Cylindrical Shell ◽  
Stress Concentrations ◽  
Medium Thickness ◽  
Circular Holes

Design of a defence hole system for a shear-loaded plate

2003 ◽  
Vol 38 (6) ◽  
pp. 507-517 ◽  
Author(s):  
S. N Akour ◽  
J. F Nayfeh ◽  
D. W Nicholson
Keyword(s):  
Finite Element Analysis ◽  
Principal Stress ◽  
Pure Shear ◽  
Optimization Method ◽  
Optimum Size ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Search Optimization ◽  
Stress Directions ◽  
Circular Holes

Stress concentrations associated with circular holes in pure shear-loaded plates can be reduced by up to 13.5 per cent by introducing elliptical auxiliary holes along the principal stress directions. These holes are introduced in the areas of low stresses near the main circular hole in order to smooth the principal stress trajectories. A systematic study based on univariate search optimization method is undertaken by using finite element analysis (FEA) to determine the optimum size and location for an auxiliary defence hole system. The results are validated using RGB (red-green-blue) photoelasticity.

scholarly journals Stress Concentration of a Cylindrical Shell with One or Two Circular Holes

1971 ◽  
Vol 37 (304) ◽  
pp. 2254-2262
Author(s):  
Minoru HAMADA ◽  
Kazuo YOKOYA ◽  
Masayuki HAMAMOTO ◽  
Tadashi MASUDA
Keyword(s):  
Cylindrical Shell ◽  
Stress Concentration ◽  
Two Circular Holes ◽  
Circular Holes

scholarly journals Open holes in composite laminates with finite dimensions: structural assessment by analytical methods

2022 ◽  
Author(s):  
M. Nguyen-Hoang ◽  
W. Becker
Keyword(s):  
Failure Analysis ◽  
Analytical Methods ◽  
Composite Laminates ◽  
Design Feature ◽  
Potential Method ◽  
Finite Width ◽  
Efficient Computation ◽  
Stress Concentrations ◽  
Open Hole ◽  
Circular Holes

AbstractOpen circular holes are an important design feature, for instance in bolted joint connections. However, stress concentrations arise whose magnitude depends on the material anisotropy and on the defect size relative to the outer finite plate dimensions. To design both safe and light-weight optimal structures, precise means for the assessment are crucial. These can be based on analytical methods providing efficient computation. For this purpose, the focus of the present paper is to provide a comprehensive stress and failure analysis framework based on analytical methods, which is also suitable for use in industry contexts. The stress field for the orthotropic finite-width open-hole problem under uniform tension is derived using the complex potential method. The results are eventually validated against Finite-Element analyses revealing excellent agreement. Then, a failure analysis to predict brittle crack initiation is conducted by means of the Theory of Critical Distances and Finite Fracture Mechanics. These failure concepts of different modelling complexity are compared to each other and validated against experimental data. The size effect is captured, and in this context, the influence of finite width on the effective failure load reduction is investigated.

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.

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