Stress Analysis and Stress Index Development for a Trunnion Pipe Support

1982 ◽  
Vol 104 (2) ◽  
pp. 73-78
Author(s):  
M. H. Sadd ◽  
R. R. Avent
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Wall Thickness ◽  
Pressure Vessel ◽  
Stress Index ◽  
Secondary Stress ◽  
Empirical Formulas ◽  
Stress Indices ◽  
Finite Element Stress Analysis

A finite element stress analysis is presented of a trunnion pipe anchor. The structure is analyzed for the case of internal pressure and various end moment loadings. Stress results were post-processed and decomposed into average and linear varying (through the wall thickness). These decomposed values were then interpreted within the ASME Boiler and Pressure Vessel Code to estimate primary and secondary stress indices. Several computer runs were made for a variety of structural sizes and empirical formulas were developed expressing the stress indices as a function of certain dimensionless ratios.

Stress Analysis of Tire Sections

1996 ◽  
Vol 24 (4) ◽  
pp. 349-366 ◽  
Author(s):  
T-M. Wang ◽  
I. M. Daniel ◽  
K. Huang
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Strain Analysis ◽  
Experimental Stress ◽  
Inflation Pressure ◽  
Substantial Agreement ◽  
Finite Element Stress Analysis ◽  
Strain Components ◽  
Fringe Patterns

Abstract An experimental stress-strain analysis by means of the Moiré method was conducted in the area of the tread and belt regions of tire sections. A special loading fixture was designed to support the tire section and load it in a manner simulating service loading and allowing for Moiré measurements. The specimen was loaded by imposing a uniform fixed deflection on the tread surface and increasing the internal pressure in steps. Moiré fringe patterns were recorded and analyzed to obtain strain components at various locations of interest. Maximum strains in the range of 1–7% were determined for an effective inflation pressure of 690 kPa (100 psi). These results were in substantial agreement with results obtained by a finite element stress analysis.

Study on the Stress Concentration at the Round Corners of Flat Heads in Pressure Vessels Subjected to Internal Pressure

1996 ◽  
Vol 118 (4) ◽  
pp. 429-433
Author(s):  
H. Chen ◽  
J. Jin ◽  
J. Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Intensity ◽  
Stress Concentration ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Stress Index ◽  
Element Analysis ◽  
Approximate Formulas

Results from finite element analysis were used to show that the stress index kσ and the nondimensionalized highly stressed hub length kh of a flat head with a round corner in a pressure vessel subjected to internal pressure are functions of three dimensionless parameters: λ ≡ h/dt, η ≡ t/d, and ρ ≡ r/t. Approximate formulas for estimating kσ and kh from λ, η, and ρ p are given. The formulas can be used for determining a suitable fillet radius for a flat head in order to reduce the fabricating cost and to keep the stress intensity at the fillet under an acceptable limit.

Flexibility Factors and Stress Indices for Piping Components With D/T ≧ 100 Subjected to In-Plane or Out-of-Plane Moment

1988 ◽  
Vol 110 (4) ◽  
pp. 374-386 ◽  
Author(s):  
T. Fujimoto ◽  
T. Soh
Keyword(s):  
Finite Element ◽  
Wall Thickness ◽  
Large Diameter ◽  
Thin Wall ◽  
Finite Element Analyses ◽  
Empirical Formulas ◽  
Stress Evaluation ◽  
Stress Indices ◽  
Piping Systems ◽  
Out Of Plane

The finite element analyses are carried out for the several piping components (D/T ≧ 100) subjected to in-plane or out-of-plane moment. For the stress evaluation of the chemical plant piping systems, ANSI B31.3 is usually applied. But the stress intensification factors and flexibility factors in this code are mainly for a heavy-wall-thickness pipe, so it is necessary to reconsider these factors for a thin-wall-thickness pipe with a large diameter. In our study, several finite element analyses using MSC/NASTRAN program were performed on the pipe bends (elbow or miter bend, 0.01 ≦ h ≦ 0.2) and the unreinforced fabricated tees (50 ≦ D/Tr ≦ 300, 0.5 ≦ d/D ≦ 0.95, 0.25 ≦ Tb/Tr ≦ 0.95), and the empirical formulas for the flexibility factors and the stress indices, due to out-of-plane or in-plane moment, were proposed. Experimental stress analyses for the piping components with D/Tr = 127 were also carried out, and it was confirmed that the results agreed well with the numerical ones.

Development of B1 and C1 Stress Indices for Trunnion Elbow Supports

1984 ◽  
Vol 106 (2) ◽  
pp. 166-171 ◽  
Author(s):  
D. K. Williams ◽  
G. D. Lewis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Pressure Loading ◽  
Empirical Relationships ◽  
Element Analysis ◽  
Stress Indices ◽  
Pressure Stress

A finite element analysis of a trunnion elbow support is presented for the case of a long radius elbow subjected to an internal pressure loading. The stress results are categorized as average and linearly varying (through the thickness) stresses. The resulting stresses are then interpreted per Section III of the ASME Boiler and Pressure Vessel Code from which the primary and secondary (B1 and C1) pressure stress indices are developed. Several analysis were performed on various structural geometries in order to determine empirical relationships for the stress indices as a function of dimensionless ratios.

Elastoplastic Analysis of Novel Parabola-Arc-Shaped Head for Internal Pressure Vessel

2015 ◽  
Vol 750 ◽  
pp. 352-362
Author(s):  
Ning Wang ◽  
Hong Qi Liu ◽  
Shan Tung Tu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Pressure Vessel ◽  
Mechanical Performance ◽  
Burst Pressure ◽  
Engineering Practice ◽  
The Novel ◽  
Limit Loads

In this paper, the elastoplastic stress analysis of a novel parabola-arc-shaped head subjected to internal pressure has been carried out using finite element method. Limit loads and burst pressures are obtained for various geometric parameters and compared with the conventional torispherical and ellipsoidal heads. For the same middle diameter and thickness, the novel parabola-arc-shaped head shows better mechanical performance than the torispherical head. The burst pressure is mainly determined by the size of cylinder and the burst always occurs in cylinder. The head can improve the burst load when the cylinder is relatively short. The improvement of the novel parabola-arc-shaped head is almost the same as the ellipsoidal head, while the torispherical head is slightly inferior. As the novel parabola-arc-shaped head can be more easily formed with less material consumed compared to the conventional ones, it should thus be applicable in engineering practice.

Finite element stress analysis of an equal diameter branch pipe intersection subjected to out-of-plane and twisting moments

1986 ◽  
Vol 21 (1) ◽  
pp. 9-16 ◽  
Author(s):  
M G Kirkwood ◽  
G D T Carmichael ◽  
D G Moffat
Keyword(s):  
Finite Element ◽  
Computer Program ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Branch Pipe ◽  
Bending Moments ◽  
Finite Element Stress Analysis ◽  
Mean Diameter ◽  
Out Of Plane ◽  
Moment Load

The authors have used the BERSAFE finite element computer program to model an equal diameter branch pipe intersection of mean diameter/thickness ratio 24.5. Previous results for internal pressure and the two in-plane bending moments are augmented by the present results for the two out-of-plane and the two twisting moment load categories. The predicted stresses are compared with results from tests on a 254 mm (10 inch) diameter welded branch junction, and also with the values from the current UK power piping code BS 806.

Improvement of a Lightweight Aluminium Cylinder Block Design Using Finite Element Stress Analysis

2020 ◽  
Vol 12 (05) ◽  
Author(s):  
Mohamad A Arsah ◽  
◽  
Syed M A Syed Mohd Yusoff Sobbry ◽  
Tengku N A Tuan Kamaruddin ◽  
Azmi Osman ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Block Design ◽  
Cylinder Block ◽  
Finite Element Stress Analysis ◽  
Finite Element Stress
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