Elastic-plastic analysis of perforated thin strips of a strain-hardening material

1964 ◽  
Vol 12 (6) ◽  
pp. 377-380 ◽  
Author(s):  
P.S. Theocaris ◽  
E. Marketos
Keyword(s):  
Strain Hardening ◽  
Hardening Material ◽  
Elastic Plastic ◽  
Plastic Analysis

An Approximate Model for an Elastic-Plastic Pipe Element Under Combined Loading

1975 ◽  
Vol 97 (1) ◽  
pp. 22-28 ◽  
Author(s):  
L. D. Larson ◽  
W. F. Stokey ◽  
W. E. Franzen
Keyword(s):  
Strain Hardening ◽  
Axial Load ◽  
Analytical Approach ◽  
Limit Load ◽  
Approximate Model ◽  
Experimental Results ◽  
Combined Loading ◽  
Elastic Plastic ◽  
Plastic Pipe ◽  
Plastic Analysis

An approximate model for the elastic-plastic analysis of a pipe element under combined loading is developed. The model is obtained by generalizing a limit load solution for combined pressure, bending, torsion and axial load to include strain hardening. For various combinations of loading of tubes, curvatures and twist angles are predicted and compared with experimental results and those predicted by a more rigorous analytical approach. The comparison shows that good results are obtained from the approximate model.

Ductile Tearing Instability of a Center-Cracked Panel of an Elastic-Plastic Strain Hardening Material

1981 ◽  
Vol 103 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Akram Zahoor ◽  
Paul C. Paris
Keyword(s):  
Plastic Strain ◽  
Strain Hardening ◽  
Plane Strain ◽  
Plane Stress ◽  
Hardening Material ◽  
Ductile Tearing ◽  
Elastic Plastic ◽  
Linear Elastic ◽  
Tearing Instability ◽  
Crack Stability

An analysis for crack instability in an elastic-plastic strain hardening material is presented which utilizes the J-integral and the tearing modulus parameter, T. A center-cracked panel of finite dimensions with Ramberg-Osgood material representation is analyzed for plane stress as well as plane strain. The analysis is applicable in the entire range of elastic-plastic loading from linear elastic to full yield. Crack instability is strongly influenced by the elastic compliance of the system, the conditions of plane stress or plane strain, and the hardening characteristics of the material. Numerical results indicate that if crack stability is ensured in a plane strain situation, then under the same circumstances a geometrically identical but plane stress panel will be stable.

A Three-Dimensional Finite Element Analysis of the Cold Forging of a Model Aluminium Connecting Rod

1985 ◽  
Vol 199 (4) ◽  
pp. 319-324 ◽  
Author(s):  
I Pillinger ◽  
P Hartley ◽  
C E N Sturgess ◽  
G W Rowe
Keyword(s):  
Computer Simulation ◽  
Finite Element ◽  
Strain Hardening ◽  
Metal Flow ◽  
Three Dimensional ◽  
Cold Forging ◽  
Connecting Rod ◽  
Element Analysis ◽  
Hardening Material ◽  
Elastic Plastic

A fully three-dimensional elastic-plastic finite element method is used to simulate metal flow during the most complex stage of the cold forging of a model of an aluminium connecting rod. The results of the computer simulation are compared with the forging of strain-hardening aluminium billets using graphite lubrication. The analysis predicts deformation patterns and hardness distributions which have been checked by selected experiments. The experimental results show inhomogeneous deformation in various parts of the forging and noticeable variations in the formation of flash around its periphery, features which are also found in the analyses. The elastic-plastic finite element technique can thus satisfactorily be applied to three-dimensional forgings of strain-hardening material. The work described here represents one part of a continuing research programme to develop computer simulation techniques for the modelling of complex cold, warm or hot industrial forgings.

Ratcheting Assessment of a Fixed Tube Sheet Heat Exchanger Subject to In Phase Pressure and Temperature Cycles

2010 ◽  
Author(s):  
Donald Mackenzie ◽  
Khosrow Behseta ◽  
Robert Hamilton
Keyword(s):  
Heat Exchanger ◽  
Strain Hardening ◽  
Sheet Thickness ◽  
Tube Sheet ◽  
Plastic Response ◽  
Hardening Material ◽  
Elastic Plastic ◽  
Perfectly Plastic ◽  
Inelastic Analysis ◽  
Plastic Shakedown

An investigation of the cyclic elastic-plastic response of an Olefin plant heat exchanger subject to cyclic thermal and pressure loading is presented. The heat exchanger configuration is non-standard as the tube-sheet thickness is considerably less than that required by conventional design by formula rules. Ratchetting assessment is performed using the elastic stress analysis and stress categorization procedure, which indicates that shakedown occurs under the specified loading. The cyclic elastic-plastic response of the heat exchanger is also modeled by inelastic analysis, assuming both elastic perfectly plastic and a strain hardening material models. In the elastic-perfect plastic analysis, the vessel exhibits incremental plastic strain accumulation for 10 full load cycles, with no indication that the configuration will adapt to steady state elastic or plastic action; i.e. elastic shakedown or plastic shakedown. However, the strain increments are small and would not lead to the development of a global plastic collapse or gross plastic deformation during the specified life of the vessel. The strain hardening analysis indicates that the actual vessel will adapt to plastic shakedown after 6 load cycles.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 18. EXPERIMENTAL CHECK OF THEORETICAL RESULTS FOR DIFFERENT HOLLOW RADIUSES AND BOTTOM-MOST PART THICKNESSES

2020 ◽  
Vol 0 (9) ◽  
pp. 16-23
Author(s):  
A. L. Vorontsov ◽  
◽  
I. A. Nikiforov ◽  
Keyword(s):  
Strain Hardening ◽  
Theoretical Calculations ◽  
High Accuracy ◽  
Geometric Parameters ◽  
Strength Characteristics ◽  
Experimental Check ◽  
Hardening Material ◽  
Direct Extrusion ◽  
Theoretical Results

The results of an experimental check of the obtained theoretical formulae allowing us to determine the most important parameters of extrusion cartridges with a counterpunch for different hollow radiuses and bottom-most part thicknesses are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials and lubricants are described in detail. Both strain-hardening material and strain-unhardening material were studied. Methodology of the theoretical calculations is demonstrated in detail. High accuracy of the obtained design formulae was confirmed.

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