Analysis of Hot Tension Test Data To Obtain Stress-Strain Curves to High Strains

1985 ◽  
Vol 13 (1) ◽  
pp. 39 ◽  
Author(s):  
KA Peters ◽  
S Gebremedhin, ◽  
RL Meltzer ◽  
MB Vieth ◽  
RL Plaut ◽  
...  
Keyword(s):  
Test Data ◽  
Tension Test ◽  
Stress Strain

Analytical stress-strain relation for soils

2021 ◽  
Author(s):  
Kristian Krabbenhoft ◽  
J. Wang
Keyword(s):  
Test Data ◽  
Narrow Range ◽  
Strain Range ◽  
Data Sets ◽  
Soil Tests ◽  
Stress Strain ◽  
Strain Relation ◽  
Stress Strain Relation ◽  
Typical Test ◽  
Typical Soil

A new stress-strain relation capable of reproducing the entire stress-strain range of typical soil tests is presented. The new relation involves a total of five parameters, four of which can be inferred directly from typical test data. The fifth parameter is a fitting parameter with a relatively narrow range. The capabilities of the new relation is demonstrated by the application to various clay and sand data sets.

Low-Cycle Fatigue Evaluation Using the Weld Master S-N Curve

2006 ◽  
Author(s):  
P. Dong ◽  
Z. Cao ◽  
J. K. Hong
Keyword(s):  
Test Data ◽  
Low Cycle Fatigue ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Structural Stress ◽  
Stress Strain ◽  
Strain Behavior ◽  
Scale Test ◽  
Stress Estimation ◽  
Fatigue Evaluation

In the context of fatigue evaluation in the low-cycle regime, the use of the master S-N curve in conjunction with elastic FE-based structural stress calculations is presented. An elastic pseudo structural stress estimation is introduced by assuming that Neuber’s rule applies in relating structural stress and strain concentration at a weld to the material’s cyclic stress-strain behavior. With the pseudo structural stress procedure, recent sources of recent full scale test data on pipe and vessel welds were analyzed as a validation of the proposed procedure. The estimated fatigue lives versus actual test lives show a reasonable agreement. Finally, the feasibility of using monotonic stress-strain curves as a first approximation is also examined for applications when cyclic stress-strain curve may not be readily found. The analysis results indicate that the life estimations using monotonic stress-strain curves are reasonable, with the recent test data falling within mean ± 2σ, where σ represents the standard deviation of the master S-N curve.

Computation of pseudo strain energy and Paris law fracture coefficients from surface energy and uniaxial strain-controlled tension test data

2006 ◽  
Vol 7 (3) ◽  
pp. 167-178 ◽  
Author(s):  
Lubinda F. Walubita ◽  
Amy Epps Martin ◽  
Gregory S. Cleveland ◽  
Robert L. Lytton
Keyword(s):  
Surface Energy ◽  
Test Data ◽  
Strain Energy ◽  
Tension Test ◽  
Uniaxial Strain ◽  
Paris Law

Non-Local Cyclic Life Prediction for Gas Turbine Components With Sharply Notched Geometries

2007 ◽  
Author(s):  
Roland Mu¨cke ◽  
Holger Kiewel
Keyword(s):  
Test Data ◽  
Gas Turbines ◽  
Life Prediction ◽  
Stress And Strain ◽  
Rotor Steel ◽  
Cyclic Life ◽  
Stress Strain ◽  
Efficient Operation ◽  
Strain Gradients ◽  
Non Local

The safe and efficient operation of modern heavy duty gas turbines requires a reliable prediction of fatigue behaviour of turbine components. Fatigue damage is located in areas where cyclic stress and strain amplitudes are highest. Thus, geometrical notches associated with stress/strain concentrations and stress/strain gradients appear to be the most important sites for fatigue crack initiation. The paper addresses a non-local concept for fatigue life prediction of notched components. In contrary to various local approaches in the field, the proposed method explicitly accounts for stress and strain gradients associated with notches, cooling holes, fillets and other design features with stress raising effect. As a result, empirical analytical expressions for considering either strain or stress gradients on cyclic life prediction are obtained. The method has been developed from cyclic test data on smooth and notched specimens made of a ferritic 1.5CrNiMo rotor steel. The obtained analytical formulations have then been applied to test data on the Nickel base superalloy MAR-M247 CC showing a good agreement between prediction and measurement. Moreover, the proposed non-local lifing concept has been validated by component tests on turbine blade firtrees. The predicted cycles to failure correlates well to the experimental results showing the applicability of the proposed method to complex engineering designs.

scholarly journals Complete Stress-Strain Curves of Rock in Uniaxial Tension Test.

1995 ◽  
Vol 111 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Katsunori FUKUI ◽  
Fengnian JIN ◽  
Seisuke OKUBO
Keyword(s):  
Uniaxial Tension ◽  
Tension Test ◽  
Stress Strain ◽  
Uniaxial Tension Test

Formulation of Bearing Friction Torque in Threaded Joints With Nonflat Contact

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Marco Gerini Romagnoli ◽  
Sayed A. Nassar ◽  
Joon Ha Lee
Keyword(s):  
Friction Coefficient ◽  
Contact Pressure ◽  
Test Data ◽  
Contact Geometry ◽  
Friction Torque ◽  
Tension Test ◽  
Two Dimensional ◽  
Pressure Data ◽  
Threaded Joints ◽  
Bearing Friction

Abstract A novel experimentally validated formulation is provided for the bearing friction torque component in threaded joints with spherical and conical contact geometry, by extending two-dimensional Motosh model for various scenarios of contact pressure. Data for the corresponding effective bearing friction radius is generated, using constant or sliding speed-dependent friction coefficient models. Generated bearing friction radius data are used in Motosh model for torque–tension test data to obtain the bearing friction coefficient, which is found to be reasonably comparable to published bearing friction data.

Mechanical Properties of Ion-Irradiated Stainless Steel Determined by Nanoindentation Tests and Finite Element Analyses

2020 ◽  
Author(s):  
Jae Min Sim ◽  
Yoon-Suk Chang ◽  
Byeong Seo Kong ◽  
Changheui Jang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Test Data ◽  
Radiation Effects ◽  
Ion Irradiation ◽  
Nanoindentation Test ◽  
Finite Element Analyses ◽  
Stress Strain ◽  
Term Operation ◽  
Constitutive Parameters

Abstract While austenitic stainless steels (ASSs) have been widely adopted for reactor vessel internals because of their excellent material properties, diverse ageing-related degradation may occur due to high temperature, corrosive and neutron radiation environments during operation. In particular, since the change of mechanical properties is a major concern in long-term operation but it is difficult to prepare and handle standard specimens influenced by neutrons, most of experimental researches for enhanced understanding of the radiation effects have been focused on high-energetic ion-irradiation and tests of small specimens. In this study, systematic finite element analyses were carried out to quantify changing mechanical properties based on both virgin and ion-irradiated nanoindentation test data of typical ASS material. First of all, numerical analysis was carried out to obtain unirradiated material constitutive parameters by using trial set along the miniature specimen and comparing test data, and then indentation stress-strain (ISS) curve was derived. Subsequently, ISS was converted into uniaxial stress-strain response taking into account simple correlation. Finally, with regard to the irradiated material, similar analytical procedures were established. 304 SS was irradiated with 2 MeV proton and radioactivity is being measured. Comparison between analysis result and experimental one will be carried out, of which details and key findings will be discussed.

Goodness-of-Fit of the Ramberg-Osgood Analytic Stress-Strain Curve to Tensile Test Data

1982 ◽  
Vol 10 (6) ◽  
pp. 263 ◽  
Author(s):  
R Horstman ◽  
KA Peters ◽  
RL Meltzer ◽  
M Bruce Vieth ◽  
R Papirno
Keyword(s):  
Tensile Test ◽  
Test Data ◽  
Goodness Of Fit ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Tensile Test Data

Probabilistic Cyclic Stress-Strain Relations of a Cast Steel for Railway Bogie Frame

2008 ◽  
Vol 44-46 ◽  
pp. 557-562 ◽  
Author(s):  
Bing Yang ◽  
Yong Xiang Zhao ◽  
Jia Chung Peng ◽  
L.Y. Yu ◽  
Wen Dong Shao
Keyword(s):  
Test Data ◽  
Fatigue Behavior ◽  
Cast Steel ◽  
Constitutive Models ◽  
Cyclic Stress ◽  
Stress Strain ◽  
Local Conditions ◽  
Incremental Strain ◽  
Random Responses ◽  
Strain Responses

Experimental study is performed on the probabilistic cyclic stress-strain responses of grade B cast steel, which is utilized in the manufacture of Chinese K6 type bogie. Fatigue test is carried out by an incremental strain-controlled method with 8 strain levels. Analysis of test data and observation on fatigue fracture surfaces of test specimens indicate that difference and evolution of local conditions are basic causes of the random fatigue damage behavior. So it is verified again that the random character of stress-strain responses is an intrinsic fatigue behavior of engineering materials. Taking the scattering regularity and the size of specimens into account, cyclic constitutive models of present test data with arbitrary probability and confidence are obtained. The analysis reveals that these models can reflect the random responses of material correctly.

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