Deformation Solution in Thin Ring Plates with Circular Holes

2013 ◽  
Vol 459 ◽  
pp. 380-385
Author(s):  
Najmeddin Arab
Keyword(s):  
Deformation Process ◽  
Stress Condition ◽  
Hole Diameter ◽  
Outer Diameter ◽  
Plane Stress Condition ◽  
Ring Plate ◽  
Thin Ring ◽  
Circular Holes ◽  
Thickness Variations ◽  
Deformation Procedure

In this research, deformation process of a thin ring plate with circular hole has been analyzed. Regarding the material characteristics and forming facilities, various forming in a blank with are possible Deep drawing without variation in central hole diameter and also by variation in hole diameter and Flanging when the outer diameter of blank is constant or variable. By taking into account the thickness variations, and work hardening, the forming of thin ring plate at plane stress condition has been considered. It is shown that the deformation procedure of each point in the blank can be describe by non-linear vector function of plasticity.

Effect of Transverse Moduli on Through-Thickness Hygrothermal Expansion Coefficients of Composite Laminates

2001 ◽  
Vol 68 (6) ◽  
pp. 878-879 ◽  
Author(s):  
H.-L. Yeh ◽  
H.-Y. Yeh
Keyword(s):  
Composite Laminates ◽  
Stress Condition ◽  
Physical Phenomenon ◽  
Point Of View ◽  
Plane Stress Condition ◽  
Geometrical Symmetry ◽  
Thermal Expansion Coefficients ◽  
Isotropic Composite ◽  
Practical Analysis ◽  
Expansion Coefficients

In practical analysis, under a plane stress condition, a unidirectional lamina can be assumed with E2=E3 from geometrical symmetry consideration. However, from an academic point of view, it is interesting to study the case of a lamina with E2≠E3. In this paper the preliminary results of the physical phenomenon about the effect of different transverse moduli E2 and E3 on the through-thickness thermal expansion coefficients αz of quasi-isotropic composite laminates is presented.

Numerical Modelling of a Chevron Notched Bend Specimen - Plane Model

2017 ◽  
Vol 754 ◽  
pp. 198-201 ◽  
Author(s):  
Jakub Sobek ◽  
S. González Menéndez ◽  
Stanislav Seitl
Keyword(s):  
Numerical Modelling ◽  
Stress Condition ◽  
Bending Test ◽  
Plane Model ◽  
Plane Stress Condition ◽  
Three Point Bending ◽  
Loading Mode ◽  
Chevron Notch ◽  
Geometry Configuration ◽  
Tension Loading

The paper focuses on a numerical modelling of the initial chevron notch in test specimens subjected to the three-point bending test geometry configuration. The plane model is used with variable thicknesses of the layers with plane stress condition. The number of layers is being investigated and the influence of some input parameters like relative crack length, breadth of initial notch, etc. is evaluated by value of the stress intensity factor for tension loading mode.

scholarly journals Damaged behavior under plane stress

2011 ◽  
pp. 341-368
Author(s):  
Thomas Paris ◽  
Khémaïs Saanouni
Keyword(s):  
Plane Stress ◽  
Constitutive Equations ◽  
Stress Condition ◽  
Time Integration ◽  
Reference Case ◽  
Plane Stress Condition ◽  
Integration Schemes ◽  
Hyperbolic Sine ◽  
Time Integration Schemes ◽  
Fully Coupled

This paper deals with the numerical treatment of "advanced" elasto-viscoplasticdamage constitutive equations in the particular case of plane stress. The viscoplastic constitutive equations account for the mixed isotropic and kinematic non linear hardening and are fully coupled with the isotropic ductile damage. The viscous effect is indifferently described by a power function (Norton type) or an hyperbolic sine function. Different time integration schemes are used and compared to each other assuming plane stress condition, widely used when dealing with shell structures as well as to the 3D reference case.

Study of the mechanical properties of a molybdenum alloy with a plane stress condition at low temperature

1980 ◽  
Vol 12 (1) ◽  
pp. 89-93
Author(s):  
A. A. Lebedev ◽  
F. F. Giginyak ◽  
V. V. Bashta ◽  
V. K. Kharchenko ◽  
V. N. Semirog-Orlik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Plane Stress ◽  
Stress Condition ◽  
Molybdenum Alloy ◽  
Plane Stress Condition

J Resistance Curve Estimation of Inhomogeneous CT Specimen

2002 ◽  
Author(s):  
Kiminobu Hojo ◽  
Kazutoshi Ohoto ◽  
Itaru Muroya
Keyword(s):  
Fracture Toughness ◽  
Plane Strain ◽  
Stress Condition ◽  
Estimation Method ◽  
Fe Analysis ◽  
Fracture Toughness Test ◽  
Plane Stress Condition ◽  
Element Analysis ◽  
Curve Estimation ◽  
The Finite Element Analysis

In order to obtain the fracture toughness curve of inhomogeneous CT specimens, a simplified J-R curve estimation method has been proposed. To verify the applicability of this method, the fracture toughness test and the finite element analysis has been conducted. In overmatching case (mismatch ratio M = 2.2), the conventional ASTM standard’s J-R curve exceeded the J-R curve from the FE analysis in the plane strain condition by over 20%. On the other hand, the simplified J-R curve was located between J-R curves from the FE analyses in plane strain and plane stress condition. In undermatching case (M = 0.5), experimental J-R curves with and without the inhomogeneity effect were almost same and the conventional standard is applicable.

Identifying Initial Imperfection Patterns of Energy Pipes Using a 3D Laser Scanner

2012 ◽  
Author(s):  
Muntaseer Kainat ◽  
Samer Adeeb ◽  
J. J. Roger Cheng ◽  
James Ferguson ◽  
Michael Martens
Keyword(s):  
Measurement Techniques ◽  
Laser Scanner ◽  
Initial Imperfection ◽  
Point Clouds ◽  
Analytical Models ◽  
Outer Diameter ◽  
University Of Alberta ◽  
Seam Weld ◽  
Thickness Variations ◽  
The University

Measurement of initial imperfections of energy pipes and incorporating them in analytical models has been a major focus of research in the pipeline industry as well as at the University of Alberta. Researchers at the University of Alberta have devised various techniques to measure initial imperfection of pipes prior to testing. The analytical imperfection models developed based on these techniques have proven to be effective in predicting pipe behavior. These techniques, however, are time consuming, error prone to some extent, and yield limited data, in addition to their limitations regarding the size of the pipes that can be measured. The objective of the current study is to overcome the limitations of the previous measurement techniques by utilizing advanced surface profiling technology. A high accuracy 3D laser scanner is used to create three dimensional models of energy pipes. Commercially available reverse engineering and inspection software is used to measure the different geometric attributes of the pipes that are of interest. This new technique enables us to overcome the previous limitations by acquiring data in the field at a faster rate and creating high resolution point clouds. The actual pipe surfaces are compared with the model of a perfect cylinder of uniform nominal diameter. It is possible to locate the axes of the scanned pipes and use these axes as references for measurements. Outer diameter variation, thickness variations, weld geometry variations and deviations from a perfect cylinder are measured. Results indicate that the deviations from a perfect cylinder can be used to describe the pattern of radii variations around the perimeter of the pipes. When described with respect to the seam weld location, distinct patterns of radii variations were identified. Thickness variations showed identical behavior in all the pipes when viewed with respect to the seam weld location.

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