A State Variable Interpretation of Some Rate-Dependent Inelastic Properties of Steel

1978 ◽  
Vol 100 (4) ◽  
pp. 395-401 ◽  
Author(s):  
B. Larsson ◽  
B. Stora˚kers
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Constitutive Equation ◽  
Physical Theory ◽  
Creep Tests ◽  
Variable Theory ◽  
One Dimensional ◽  
State Variable ◽  
Rate Dependent ◽  
Stress States

Based on a state variable theory proposed by Onat some discriminating creep tests of stainless steel have been designed and carried out at elevated temperature conditions. Quantitative correlations of the results are sought with predictions from a physical theory for recovery creep proposed by Lagneborg. The findings are utilized to interpret the behavior of creeping members when subjected to a rapid increase in the rate of straining. Different approaches toward generalization of physical one-dimensional creep laws to multiaxial stress states are discussed. A tentative constitutive equation applicable to the solution of general boundary value problems is proposed.

On the Burst of Pipes Under Internal Pressure and Elevated Temperature: Part 1 — Rate Independent Study

2002 ◽  
Author(s):  
Maoye Sun ◽  
Paul Bunch
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Internal Pressure ◽  
Steel Part ◽  
Independent Study ◽  
Burst Pressure ◽  
Super Duplex Stainless Steel ◽  
Steel Tubes ◽  
Rate Dependent ◽  
Stainless Steel Part

This paper presents the results of a study on how the burst of steel tubes is influenced by elevated temperature between 75°F and 350°F (24°C and 177°C). The study involves experiments and modeling of burst. Burst tests were conducted on UNS S32750 super duplex stainless steel. Part I is concerned with rate independent burst, while part II (to be published) is concerned with rate dependent burst. Two models were used to simulate the burst experiments. In the first model, the tube is represented as a cylindrical expansion membrane. In the second model, the tube is modeled as a finitely deforming shell which allows a bulge to grow in the unsymmetric manner seen in the final stages of the experiments. Both models produce the burst pressure accurately. The second model has the advantage of being able to study the effect of local thickness imperfections.

Development of a one-dimensional constitutive equation for metals subjected to high strain rate and large strain

1994 ◽  
Vol 29 (2) ◽  
pp. 117-127 ◽  
Author(s):  
M S J Hashmi ◽  
A M S Hamouda
Keyword(s):  
Constitutive Equation ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Numerical Technique ◽  
Large Strain ◽  
Mechanical Energy ◽  
Pure Copper ◽  
One Dimensional ◽  
Rate Dependent

This paper outlines a simple technique to establish rate dependent stress-strain properties for metallic materials. The materials considered are commercially pure copper and mild steel. The deformation of materials at high strain rate leads to the conversion of mechanical energy into heat. The temperature rise produced during these processes can be significant and can lead to phase transformation. A combined experimental and numerical technique has been used to establish the one-dimensional constitutive equation, which takes account of the effects of strain, strain hardening, strain rate, inertia, and temperature.

J&L TYPE 309

Alloy Digest ◽  
2003 ◽  
Vol 52 (12) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Good Combination ◽  
Resistance To Oxidation ◽  
Cold Worked ◽  
Specialty Steel

Abstract Type 309 (UNS S30900) is an austenitic chromium-nickel stainless steel widely used for elevated-temperature services. It has a good combination of oxidation resistance and corrosion-resisting properties. The alloy is essentially nonmagnetic when annealed and become slightly magnetic when cold worked. It is intended primarily for high-temperature applications at 816 deg C (1500 deg F) or higher where resistance to oxidation and/or corrosion is required. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-896. Producer or source: J & L Specialty Steel Inc.

UNILOY 430

Alloy Digest ◽  
1982 ◽  
Vol 31 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Elevated Temperature ◽  
Stainless Steels ◽  
Heat Treating ◽  
Storage Tanks ◽  
Good Resistance ◽  
Temperature Performance ◽  
Temperature Scaling

Abstract UNILOY 430 is a medium-chromium (17%) non-hardening, ferritic stainless steel. Of the AISI 400 series stainless steels, Uniloy 430 most nearly resembles the 18% chromium-8% nickel stainless steels in fabrication and service. It has excellent resistance to corrosion and good resistance to elevated-temperature scaling. Its many uses include architectural trim, nitric acid storage tanks and kitchen appliances. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-408. Producer or source: Cyclops.

Elevated Temperature Corrosion Of Type 310 Stainless Steel By Vanadium Compounds

CORROSION ◽  
1961 ◽  
Vol 17 (4) ◽  
pp. 185t-187t ◽  
Author(s):  
HUGH L. LOGAN
Keyword(s):  
Stainless Steel ◽  
Water Vapor ◽  
Elevated Temperature ◽  
Chemical Analysis ◽  
Steel Slag ◽  
Vanadium Compounds ◽  
Nickel Iron ◽  
310 Stainless Steel ◽  
Boundary Penetration ◽  
Iron And Manganese

Abstract The mechanism of the attack of Type 310 stainless steel by vanadium compounds has been studied. Catastrophic attack by a mixture of 67 wt. percent V 2 O 5 + 33 wt. percent of NaVO 3 occurred at temperatures of 1900 to 2000 F if the steel had previously been oxidized and air and water vapor were present. In some instances an unidentified phase formed at the steel-slag interface attacked the steel by grain boundary penetration and adsorption of steel grains. A chemical analysis of the slag showed that the chromium-iron and manganese-iron ratios were the same in the slag as in the steel. The nickel-iron ratio, however, was higher in the slag than in the steel. This would suggest the possibility that nickel is selectively absorbed by the slag prior to general attack. 4.2.3; 4.3.3, 3.5.9, 6.2.5

An Experimental Study on the Effect of Prior Plastic Straining on Creep Behavior of 304 Stainless Steel

1993 ◽  
Vol 115 (2) ◽  
pp. 200-203 ◽  
Author(s):  
Z. Xia ◽  
F. Ellyin
Keyword(s):  
Stainless Steel ◽  
Plastic Strain ◽  
Strain Rate ◽  
Creep Behavior ◽  
Test Procedure ◽  
Constant Strain Rate ◽  
304 Stainless Steel ◽  
Creep Model ◽  
Plastic Strain Rate ◽  
Creep Tests

Constant strain-rate plastic straining followed by creep tests were conducted to investigate the effect of prior plastic straining on the subsequent creep behavior of 304 stainless steel at room temperature. The effects of plastic strain and plastic strain-rate were delineated by a specially designed test procedure, and it is found that both factors have a strong influence on the subsequent creep deformation. A creep model combining the two factors is then developed. The predictions of the model are in good agreement with the test results.

Study on the Dynamic Performance of Asphalt Concrete under Passive Confined Pressure

2012 ◽  
Vol 226-228 ◽  
pp. 1755-1759
Author(s):  
Hua Zhang ◽  
Fei Li ◽  
Yu Wei Gao
Keyword(s):  
Elastic Modulus ◽  
Asphalt Concrete ◽  
Poisson Ratio ◽  
Dynamic Properties ◽  
Dynamic Performance ◽  
Dynamic Strength ◽  
Confining Pressure ◽  
Mechanical Behaviors ◽  
One Dimensional ◽  
Stress States

An improved passive confining pressure SHPB method was used to study the dynamic mechanical behaviors of asphalt concrete under quasi-one dimensional strain state. The effect of confining jacket material and its geometrical sizes on the confining pressure were discussed. The dynamic strength, dynamic modulus of elasticity and dynamic Poisson ratio of asphalt concrete were obtained. The influential rules of confining pressure on the dynamic properties were studied by comparing the stress-strain curves of asphalt concrete under different stress states. The study found that passive confining greater impact on the strength of asphalt concrete than elastic modulus and Poisson ratio, but the elastic modulus improved with the increase of confining pressure.

Experimental Investigation of Ti-6Al-4V with a Biaxial Tensile Test Setup at Elevated Temperature

2014 ◽  
Vol 622-623 ◽  
pp. 273-278 ◽  
Author(s):  
Marion Merklein ◽  
Sebastian Suttner ◽  
Adam Schaub
Keyword(s):  
Elevated Temperature ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Advanced Materials ◽  
Uniaxial Tensile ◽  
Plastic Yielding ◽  
Characterization Methods ◽  
Specific Strength ◽  
Biaxial Tensile ◽  
Stress States

The requirement for products to reduce weight while maintaining strength is a major challenge to the development of new advanced materials. Especially in the field of human medicine or aviation and aeronautics new materials are needed to satisfy increasing demands. Therefore the titanium alloy Ti-6Al-4V with its high specific strength and an outstanding corrosion resistance is used for high and reliable performance in sheet metal forming processes as well as in medical applications. Due to a meaningful and accurate numerical process design and to improve the prediction accuracy of the numerical model, advanced material characterization methods are required. To expand the formability and to skillfully use the advantage of Ti-6Al-4V, forming processes are performed at elevated temperatures. Thus the investigation of plastic yielding at different stress states and at an elevated temperature of 400°C is presented in this paper. For this reason biaxial tensile tests with a cruciform shaped specimen are realized at 400°C in addition to uniaxial tensile tests. Moreover the beginning of plastic yielding is analyzed in the first quadrant of the stress space with regard to complex material modeling.

Investigation of the One-Dimensional Endochronic Constitutive Equation for Metals by the Rivlin Test

1984 ◽  
Vol 106 (3) ◽  
pp. 264-270 ◽  
Author(s):  
Han C. Wu ◽  
C. C. Yang
Keyword(s):  
Constitutive Equation ◽  
Strain Path ◽  
Small Strain ◽  
One Dimensional ◽  
Good For ◽  
The One ◽  
Cyclic Straining ◽  
Strain Cycling ◽  
Theory And Experiment

Two sets of experiments with and without strain cycling have been carried out to test the validity of an equation derived from the improved theory of endochronic plasticity. It has been found that for strain path not involving cyclic straining the agreement between theory and experiment is quite good. In the test with strain cycling, the agreement is not good for small strain amplitudes of cycling but the discrepancy diminishes with the increasing amplitude of the strain cycling.

Rate-dependent nonlinear constitutive equation of polypropylene

1989 ◽  
Vol 27 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Masayoshi Kitagawa ◽  
Tatsuya Mori ◽  
Tomohiko Matsutani
Keyword(s):  
Constitutive Equation ◽  
Rate Dependent ◽  
Nonlinear Constitutive Equation
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