Thermo-Elasto-Plastic Analysis of Pearlitic Transformation Plasticity under Combined Bending-Tensile Loading

2016 ◽  
Vol 725 ◽  
pp. 328-333
Author(s):  
M. Arif Hamdam ◽  
Kazuki Takahashi ◽  
Hayata Tateoka ◽  
Kenichi Oshita ◽  
Shigeru Nagaki
Keyword(s):  
Hydrostatic Pressure ◽  
Deformation Theory ◽  
Tensile Loading ◽  
Transformation Plasticity ◽  
Pearlitic Transformation ◽  
Plastic Analysis ◽  
Loading System ◽  
Dependent Model ◽  
Loading Tests ◽  
Applied Tensile Stress

In a previous study, we showed the anisotropy of plastic strain due to the pearlitic transformation and proposed a hydrostatic pressure-dependent constitutive equation to describe this phenomenon. In the present study, we assess the validity of this model using a bending-tensile loading system to experimentally and numerically analyze and characterize the pearlitic transformation plasticity. First, the maximum bending deflections due to the austenite-pearlite transformation were measured under different loadings and then transformation-plasticity coefficients were determined. Furthermore, as was done for bending-tensile loading tests, the pearlitic transformation plasticity was simulated using Abaqus Standard under the same austenitization and loading conditions as in experiments, and the calculated results for pearlitic-transformation plastic deformation are compared with the experimental results. The results show that the transformation plastic deflection due to the pearlitic transformation decreases with increasing applied tensile stress. In addition, this behavior can be described by a hydrostatic pressure-dependent model in large-deformation theory.

Experimental Investigation of Transformation Plastic Behavior under Tensile-Compressive-Torsional Stress in Steel

2014 ◽  
Vol 626 ◽  
pp. 426-431 ◽  
Author(s):  
Naoki Hikida ◽  
Yuta Yamamoto ◽  
Kenichi Oshita ◽  
Shigeru Nagaki
Keyword(s):  
Hydrostatic Pressure ◽  
Testing System ◽  
Plastic Behavior ◽  
Test Results ◽  
Transformation Plasticity ◽  
Biaxial Testing ◽  
Torsional Strain ◽  
Pearlitic Transformation ◽  
Dependent Model ◽  
Plasticity Coefficient

A tensile/compressive-torsional biaxial testing system was employed and tensile/ compressive-torsional tests were performed for the hollow specimen, which was loaded and the austenized specimen was cooled so that pealrite transformation accompanied by transformation plasticity occurred and axial and torsional strain were measured. Furthermore, the elastic-plastic constitutive equation due to phase transformation based on the hydrostatic pressure dependent model was proposed, and the validity of this equation was discussed experimentally. The test results showed the transformation plasticity coefficient due to pearlitic transformation of S45C depends on the loading direction, and these behaviour can be appropriately expressed by the hydrostatic pressure dependent model than the isotropic model.

scholarly journals 20108 Evaluation of transformation plasticity under combined bending-tensile loading system

2014 ◽  
Vol 2014.20 (0) ◽  
pp. _20108-1_-_20108-2_
Author(s):  
Mohammad Arif HAMDAM ◽  
Shigeru NAGAKI ◽  
Kenichi OSHITA
Keyword(s):  
Tensile Loading ◽  
Transformation Plasticity ◽  
Loading System

Failure Analysis of Tubular Hydroforming

2000 ◽  
Author(s):  
Z. C. Xia
Keyword(s):  
Internal Pressure ◽  
Process Parameters ◽  
Deformation Theory ◽  
Failure Modes ◽  
Tensile Loading ◽  
Failure Criteria ◽  
Material Anisotropy ◽  
Governing Equations ◽  
Compression Load ◽  
Failure Diagram

Abstract A mathematical analysis of failure developments for tubular hydroforming under combined internal pressure and end feeding is presented in this paper. Under considerations are two distinct failure modes, namely the bursting and the wrinkling. Bursting is an instability phenomenon where the tube can’t sustain any more tensile loading. Splitting usually follows due to extreme deformations in the bursting area. Wrinkling is due to high compression load, which deteriates the qulity of the final product. The deformation theory of plasticity is utilized in this study that takes into account of material anisotropy. The governing equations for the onset of both failure modes are established. The results are presented as Hydroforming Failure Diagram in the End Feed – Internal Pressure space. A parametric study of the failure criteria for a variety of materials and process parameters is performed. It is shown that the material anisotropy plays a significant role. The results provide guidelines for product designers and process engineers for the avoidance of failure during hydroforming. The validity and applicability of current study are also discussed.

RESEARCH ON THE SELF-SYNCHRONOUS VIBRATION OF FATIGUE LOADING TESTS FOR WIND TURBINE BLADES

2016 ◽  
Vol 40 (5) ◽  
pp. 871-881
Author(s):  
Huang Xuemei ◽  
Zhang Lei’an ◽  
Tao Liming ◽  
Wei Xiuting
Keyword(s):  
Wind Turbine ◽  
Initial Phase ◽  
Turbine Blades ◽  
Fatigue Loading ◽  
Test System ◽  
The Self ◽  
Driving Frequency ◽  
Wind Turbine Blades ◽  
Loading System ◽  
Loading Tests

To carry on fatigue loading tests for wind turbine blades accurately, the self-synchronous vibration mechanism of loading system was investigated. Firstly, the mathematical model of vibration was deduced based on LaGrange Equation, thus the influence factors of self-synchronous vibration could be obtained. Then to study the influencing rules of the initial phase difference between loading equipment and blade, a simulating model was constructed to carry on the numerical simulation and it was found that when the driving frequency of the loading equipment was the same as the natural frequency of the blade, a different initial phase separation would generate different effect on self-synchronous vibration. Finally, an on-site fatigue test system was established to verify the accuracy of mathematical and simulation model mentioned above. It could be concluded that the test results were consistent with the simulating result. The research on the self-synchronous vibration performance of loading system for blade could supply a theory support for the sequent control of blade’s fatigue tests precisely.

Failure Analysis of Tubular Hydroforming

2000 ◽  
Vol 123 (4) ◽  
pp. 423-429 ◽  
Author(s):  
Z. C. Xia
Keyword(s):  
Internal Pressure ◽  
Deformation Theory ◽  
Failure Modes ◽  
Tensile Loading ◽  
Failure Criteria ◽  
Material Anisotropy ◽  
Governing Equations ◽  
Compression Load ◽  
Failure Diagram

A mathematical analysis of failure developments for tubular hydroforming under combined internal pressure and end feeding is presented in this paper. Under considerations are two distinct failure modes, namely, the bursting and the wrinkling. Bursting is an instability phenomenon where the tube can’t sustain any increased tensile loading. Splitting usually follows due to extreme deformations in the bursting area. Wrinkling is due to high compression load, which deteriorates the quality of the final product. The deformation theory of plasticity is utilized in this study and the material anisotropy is accounted for in the constitutive model. The governing equations for the onset of both failure modes are established. The results are presented as Hydroforming Failure Diagram in the End Feed—Internal Pressure space. A parametric study of the failure criteria for a variety of materials and process parameters is performed. It is shown that the material anisotropy plays a significant role. The results provide guidelines for product designers and process engineers for the avoidance of failure during hydroforming. The validity and applicability of current study are also discussed.

Pavement Evaluation for ERS Steel Deck Pavement Using Accelerated Loading Test

2017 ◽  
Vol 744 ◽  
pp. 97-104
Author(s):  
Fei Chen ◽  
Ke Zhong ◽  
Xiao Hao Wei
Keyword(s):  
Steel Bridge ◽  
Loading Test ◽  
Pavement Evaluation ◽  
Loading System ◽  
Loading Tests ◽  
Pavement Structures ◽  
Long Term Performance ◽  
Term Performance ◽  
Steel Deck

In order to verify the practical application of ERS steel deck pavement system, based on the project of Jia Shao bridge, the pavement accelerated loading system is used to test the long-term performance of the steel bridge deck pavement. Tests find that the absolute value of the average rut growth depth of ERS and ERN is less than 5mm when the number of axle loads is 2.05 million times. After more than 1.3 million loading tests, the two deck pavement structures are almost impermeable to water and their anti-skid properties also tend to be stable. The results show that ERS and ERN are not cracked under natural conditions and have excellent anti-rutting performance.

Creep measurement of refractory material in high-temperature tensile loading tests

1995 ◽  
Author(s):  
Adam E. Barnes ◽  
Russell G. May ◽  
J. Pedrazzani ◽  
Kent A. Murphy ◽  
Richard O. Claus ◽  
...  
Keyword(s):  
High Temperature ◽  
Refractory Material ◽  
Tensile Loading ◽  
Loading Tests ◽  
High Temperature Tensile ◽  
Creep Measurement
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