Stress Analysis and Weight Savings of Internally Pressurized Composite-Jacketed Isotropic Cylinders

1990 ◽  
Vol 112 (4) ◽  
pp. 397-403 ◽  
Author(s):  
M. D. Witherell ◽  
M. A. Scavullo
Keyword(s):  
Experimental Study ◽  
Composite Material ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Outer Diameter ◽  
Hoop Strain ◽  
Isotropic Cylinder ◽  
Orthotropic Composite Material ◽  
Compound Cylinder ◽  
Cylindrically Orthotropic

An isotropic cylinder designed to have a specific bore displacement per unit of internal pressure can be made lighter by removing material from the outer diameter and replacing it with the correct amount of a stiff lightweight composite material. A stress solution is presented for an internally pressurized compound cylinder constructed from an isotropic liner jacketed with a cylindrically orthotropic composite material. The solution is used to determine the set of compound cylinder geometries which have equivalent bore hoop strain to that of an isotropic monoblock cylinder. An equation for predicting the equivalent compound cylinder geometry which provides the maximum possible weight savings over the isotropic design is also presented. To verify the theory, an experimental study was conducted involving the measurement of bore strain for internally pressurized steel liners jacketed with a graphite bismaleimide composite.

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.

Advances in Tire Composite Theory

1973 ◽  
Vol 1 (2) ◽  
pp. 210-250 ◽  
Author(s):  
J. D. Walter ◽  
G. N. Avgeropoulos ◽  
M. L. Janssen ◽  
G. R. Potts
Keyword(s):  
Composite Material ◽  
Stress Analysis ◽  
Elastic Properties ◽  
Material Technology ◽  
Present Composite ◽  
Pneumatic Tires

Abstract Fundamentals of composite material technology are applied to the investigation of multi-ply cord-reinforced rubber systems as used in pneumatic tires. The stiffness parameters of such multi-ply systems are determined through the use of the elastic properties of the constituent cord and rubber components. The effects of coupling between the bending and stretching modes of deformation are discussed along with the limitations of present composite material technology as applied to soft rubbery systems. The predicted stiffness parameters are related to tread wear, obstacle envelopment, vibration, and stress analysis of tires.

Ratcheting assessment of corroded elbow pipes subjected to internal pressure and cyclic bending moment

2021 ◽  
pp. 030932472198989
Author(s):  
Ali Salehi ◽  
Armin Rahmatfam ◽  
Mohammad Zehsaz
Keyword(s):  
Growth Rate ◽  
Stainless Steel ◽  
Internal Pressure ◽  
Bending Moment ◽  
Axial Direction ◽  
Hoop Strain ◽  
Cyclic Bending ◽  
High Fatigue ◽  
The Impact ◽  
Cyclic Bending Moment

The present study aimed to study ratcheting strains of corroded stainless steel 304LN elbow pipes subjected to internal pressure and cyclic bending moment. To this aim, spherical and cubical shapes corrosion are applied at two depths of 1 mm and 2 mm in the critical points of elbow pipe such as symmetry sites at intrados, extrados, and crown positions. Then, a Duplex 2205 stainless steel elbow pipe is considered as an alternative to studying the impact of the pipe materials, due to its high corrosion resistance and strength, toughness, and most importantly, the high fatigue strength and other mechanical properties than stainless steel 304LN. In order to perform numerical analyzes, the hardening coefficients of the materials were calculated. The results highlight a significant relationship between the destructive effects of corrosion and the depth and shape of corrosion, so that as corrosion increases, the resulting destructive effects increases as well, also, the ratcheting strains in cubic corrosions have a higher growth rate than spherical corrosions. In addition, the growth rate of the ratcheting strains in the hoop direction is much higher across the studied sample than the axial direction. The highest growth rate of hoop strain was observed at crown and the highest growth rate of axial strains occurred at intrados position. Altogether, Duplex 2205 material has a better performance than SS 304LN.

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