scholarly journals Ultrasonic Assessment of the Influence of Cold Rolling and Recrystallization Annealing on the Elastic Constants in a TWIP Steel

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6559
Author(s):  
Linton Carvajal ◽  
María Sosa ◽  
Alfredo Artigas ◽  
Nelson Luco ◽  
Alberto Monsalve
Keyword(s):  
Cold Rolling ◽  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Twip Steel ◽  
Ultrasonic Waves ◽  
Poisson's Ratio ◽  
Recrystallization Annealing ◽  
Acoustic Birefringence ◽  
The Times ◽  
High Level

The evolution of the elastic constants, , and Poisson’s ratio and acoustic birefringence of a Fe-0.5 wt% C-21.5 wt% Mn twinning-induced plasticity (TWIP) steel with reduction by cold rolling and recrystallization annealing was assessed from measurements of the times of flight of ultrasonic waves propagating along the thickness of the rolled plates. As the reduction increased, changes in the elastic constants resulted in a steadily increasing orthotropy, which was clearly shown by Poisson’s ratio and acoustic birefringence. Although optical metallography and hardness measurements showed that partial or full recrystallization is attained after annealing at 600 °C and 700 °C, the ultrasonic measurements revealed that a high level of orthotropy remains.

scholarly journals Acoustic Birefringence and Poisson's Ratio Determined by Ultrasound: Tools to Follow-Up Deformation by Cold Rolling and Recrystallization

2017 ◽  
Vol 20 (suppl 2) ◽  
pp. 304-310 ◽  
Author(s):  
Linton Carvajal ◽  
Alfredo Artigas ◽  
Alberto Monsalve ◽  
Yolanda Vargas
Keyword(s):  
Cold Rolling ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Acoustic Birefringence

Application of Texture Analysis for Optimizing Thermo-Mechanical Treatment of a High Mn TWIP Steel

2014 ◽  
Vol 922 ◽  
pp. 213-218 ◽  
Author(s):  
Christian Haase ◽  
Luis Antonio Barrales-Mora ◽  
Dmitri A. Molodov ◽  
Günter Gottstein
Keyword(s):  
Cold Rolling ◽  
Texture Analysis ◽  
Twip Steel ◽  
Uniform Elongation ◽  
High Yield ◽  
Processing Route ◽  
Recrystallization Annealing ◽  
Deformation Degree ◽  
Texture Measurement ◽  
Wide Range

A recently introduced processing route consisting of cold rolling and recovery annealing allows the production of TWIP steels with high yield strength along with appreciable uniform elongation due to the thermal stability of mechanically induced nanoscale twins. A wide range of strength-ductility combinations was obtained using recovery and recrystallization annealing of 30%, 40%, and 50% cold-rolled Fe-23Mn-1.5Al-0.3C TWIP steel. Texture measurement during cold rolling and annealing was proven to be a suitable tool to determine the optimal deformation degree and annealing time for this processing method. As a consequence, texture analysis can be used to predict the final materials properties.

scholarly journals Direct Determination of Dynamic Elastic Modulus and Poisson’s Ratio of Timoshenko Rods

Vibration ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 157-173 ◽  
Author(s):  
Guadalupe Leon ◽  
Hung-Liang Chen
Keyword(s):  
Exact Solution ◽  
Finite Element ◽  
Elastic Constants ◽  
Frequency Ratio ◽  
Poisson’S Ratio ◽  
Direct Determination ◽  
Poisson's Ratio ◽  
Torsional Mode ◽  
Bending Mode ◽  
Resonance Frequencies

In this paper, the exact solution of the Timoshenko circular beam vibration frequency equation under free-free boundary conditions was determined with an accurate shear shape factor. The exact solution was compared with a 3-D finite element calculation using the ABAQUS program, and the difference between the exact solution and the 3-D finite element method (FEM) was within 0.15% for both the transverse and torsional modes. Furthermore, relationships between the resonance frequencies and Poisson’s ratio were proposed that can directly determine the elastic constants. The frequency ratio between the 1st bending mode and the 1st torsional mode, or the frequency ratio between the 1st bending mode and the 2nd bending mode for any rod with a length-to-diameter ratio, L/D ≥ 2 can be directly estimated. The proposed equations were used to verify the elastic constants of a steel rod with less than 0.36% error percentage. The transverse and torsional frequencies of concrete, aluminum, and steel rods were tested. Results show that using the equations proposed in this study, the Young’s modulus and Poisson’s ratio of a rod can be determined from the measured frequency ratio quickly and efficiently.

Role of Elastic Constants in Certain Contact Problems

1970 ◽  
Vol 37 (4) ◽  
pp. 965-970 ◽  
Author(s):  
J. Dundurs ◽  
M. Stippes
Keyword(s):  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Contact Problems ◽  
Poisson's Ratio ◽  
Two Dimensional ◽  
Frictionless Contact ◽  
Plane Contact

The dependence of stresses on the elastic constants is explored in frictionless contact problems principally for the case when the contacting bodies are made of the same material and the deformations are induced by prescribed surface tractions. The strongest results can be obtained for problems with contacts that either recede or remain stationary upon loading. In such problems, the stresses are proportional to the applied tractions and the extent of contact is independent of the level of loading. Furthermore, it is shown that the Michell result regarding the dependence of stresses on Poisson’s ratio carries over to plane contact problems with receding and stationary contacts. In three and two-dimensional problems with advancing contacts, it is possible to establish certain rules for scaling displacements and stresses.

scholarly journals On the identification of the eggshell elastic properties under quasistatic compression

2004 ◽  
Vol 52 (5) ◽  
pp. 73-82 ◽  
Author(s):  
Jana Simeonovová ◽  
Jaroslav Buchar
Keyword(s):  
Young’S Modulus ◽  
Elastic Properties ◽  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Poisson's Ratio ◽  
Rotational Shell ◽  
Mutual Comparison ◽  
Quasistatic Loading

The problem of the identification of the elastic properties of eggshell, i.e. the evaluation of the Young's modulus and Poisson's ratio is solved. The eggshell is considered as a rotational shell. The experiments on the egg compression under quasistatic loading have been conducted. During these experiments a strain on the eggshell surface has been recorded. By the mutual comparison between experimental and theoretical values of strains the influence of the elastic constants has been demonstrated.

scholarly journals A systematic typology for negative Poisson's ratio materials and the prediction of complete auxeticity in pure silica zeolite JST

2015 ◽  
Vol 17 (27) ◽  
pp. 17927-17933 ◽  
Author(s):  
M. Siddorn ◽  
F.-X. Coudert ◽  
K. E. Evans ◽  
A. Marmier
Keyword(s):  
Single Crystals ◽  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Zeolite Framework ◽  
Pure Silica ◽  
Negative Poisson's Ratio

From experimental elastic constants, partial auxeticity occurs in around 37% of single crystals, average auxeticity is limited to α-cristobalite and complete auxeticity is not observed. Two hundreds pure silica zeolites are simulated and complete auxeticity is found in the JST zeolite framework.

Effect of changes in elastic constants on the strength of composites

1988 ◽  
Vol 23 (4) ◽  
pp. 213-221 ◽  
Author(s):  
W Zhang ◽  
K E Evans
Keyword(s):  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Maximum Stress ◽  
High Strength ◽  
Poisson's Ratio ◽  
Failure Strength ◽  
Failure Envelope ◽  
Strength Parameters ◽  
Failure Envelopes ◽  
Strain Space

Tensor polynomial, maximum stress, and maximum strain criteria are considered in an investigation of the effect of varying elastic constants on the failure strength of composites. By expressing each criterion in the alternative stress or strain space they are made explicitly dependent on elastic constants as well as strength parameters. The significance of this result is highlighted by an example of the variation in failure envelope produced by altering the Poisson's ratio of the composite material. In particular the failure envelopes for a high strength graphite/epoxy resin (SP-286/T300) composite lamina are examined as a function of variations in the material's Poisson's ratio. The limits in the variation of the Poisson's ratio for this composite lamina are identified.

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