Mathematical Modelling of the Stress-Strain Curve for 31VMn12 Ecological Steel

2017 ◽  
Vol 54 (3) ◽  
pp. 409-413
Author(s):  
Carmen Otilia Rusanescu ◽  
Cosmin Jinescu ◽  
Marin Rusanescu ◽  
Maria Cristiana Enescu ◽  
Florina Violeta Anghelina ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Strain Curve ◽  
Torsion Test ◽  
Processing Parameters ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Hollomon Parameter ◽  
Relationship Of ◽  
The Mathematical Model ◽  
The Relationship

In this paper, optimum hot formation processing parameters for 31VMn12 steel were established, the torsion deformation of 31VMn12 steel was investigated at temperatures from 900, 1000, 11000C and strain rates from 0.05 s-1 to 3 s. -1. There were studied the structural aspects of materials, in microstructures by electronic microscopy. The stress level decreases with increasing deformation temperature and decreasing strain rate, which can be represented by a Zenner-Hollomon parameter. The mathematical model presented in the paper describes the relationship of tension strain, voltage and temperature coefficient 31VMn12 steel at high temperatures. The stress-strain curves determined by the torsion test allowed the calculation of the Zenner-Hollomon parameter corresponding to the maximum stress. By using this parameter has established a set of equations that reproduce completely stress-strain curve, including the hardening, the restoration and dynamic recrystallization area. Comparisons were made between the experimental results and the predicted and confirmed that constitutive equations developed can be used for mathematical modelling and other attempts (forging, compression) and other types of steel.

A 3-Dimensional Model Related to Stress-Strain-Time of Rock Salts

2012 ◽  
Vol 525-526 ◽  
pp. 245-248
Author(s):  
Hua Bin Zhang ◽  
Zhi Yin Wang ◽  
Ji Wei Ma
Keyword(s):  
Strain Curve ◽  
Salt Rock ◽  
Dimensional Model ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
3 Dimensional ◽  
Whole Process ◽  
Softening Curve ◽  
Time Space ◽  
Relationship Of

To build a stress-strain-time relationship of salt rock with unified instantaneous law and creep law, we combine the stress-strain curve with whole process of creep curve, looking for inner relation between softening curve and creep deformation. Finally, the stress-strain-time space surface is obtained. The researching results demonstrated that time and space development law of rock salts can be well reflected by it.

Experimental Research on the Stress - Strain Curve of Regional Confined Concrete under Single Axial Press

2014 ◽  
Vol 584-586 ◽  
pp. 1289-1292
Author(s):  
Guo Liang Zhu
Keyword(s):  
Mechanical Properties ◽  
Theoretical Analysis ◽  
Constitutive Model ◽  
Theoretical Basis ◽  
Strain Curve ◽  
Confined Concrete ◽  
Constitutive Relationship ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Relationship Of

Regional confined concrete is base on confined concrete. It is the theory and application of a new attempt and development on confined concrete. To apply it to the actual project, we need to research mechanical properties and establish constitutive relationship of regional confined concrete. According to the research, we had carried on a series of tests, founded the stress-strain constitutive model of regional confined concrete under single axial press. The accuracy of theoretical analysis were more fully verified , and a theoretical basis for the application was provided.

A Theoretical and Experimental Analysis of the General Wool Fiber Stress-Strain Behavior with Particular Reference to Structural and Dimensional Nonuniformities

1969 ◽  
Vol 39 (2) ◽  
pp. 121-140 ◽  
Author(s):  
J. D. Collins ◽  
M. Chaikin
Keyword(s):  
Structural Variation ◽  
Strain Curve ◽  
Fiber Material ◽  
Effective Area ◽  
Stress Strain Curve ◽  
Fiber Stress ◽  
Stress Strain ◽  
Strain Behavior ◽  
Area Variation ◽  
The Relationship

The general wool-type three-region behavior (i.e., Hookean, yield, and post-yield regions) is examined both theoretically and experimentally. In order to account for the influence of structural variation, the concept of effective area is introduced and it is shown that this effective area may differ according to the region in which the fiber is being extended. The general effects of effective-area variation on the regions of the stress-strain curve are derived and these are applied to a number of theoretical situations to demonstrate the stress-strain possibilities. It is shown that the relationship between the stress-strain curves for different sets of conditions can be quite complex since the nonuniformity relationships for the various regions of the curves and between curves may vary according to the conditions of testing. Two examples are given of the application of the theory in practice. The behavior of fibers in water and hydrochloric acid are compared and it is shown that there are variations in the effect of the acid within the fiber. The behavior of abraded fibers is examined and it is found that differences previously attributed by other workers to differences between the ortho and para components of the fibers are actually due to variable bond breakdown within the fiber material.

Quantitative Characterization of Cure. I. Relationship between Modulus and Strain of Pure-Gum Natural-Rubber Vulcanizates

1952 ◽  
Vol 25 (3) ◽  
pp. 430-439 ◽  
Author(s):  
R. F. Blackwell
Keyword(s):  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Quantitative Characterization ◽  
Strain Data ◽  
Tentative Explanation ◽  
Natural Rubber Vulcanizates ◽  
The Relationship ◽  
Mooney Equation

Abstract The object of this investigation was to determine whether the relationship between strain (elongation) and modulus is sufficiently close for one to be calculated from the other. Stress-strain data have been recorded for loads of 2–10 kg. per sq. cm. for a series of ACS1 and other pure-gum compounds. It is shown that the strain at a fixed stress (5 kg. per sq. cm.) is uniquely related to the load required to produce an elongation of 100 per cent. A tentative explanation of this observation is given in terms of the Mooney equation for the stress-strain curve. It is shown that the second constant of this equation does not vary greatly from rubber to rubber.

Effect of Gamma-Irradiation towards Stress-Strain Curve of Single Die QFN Package

2011 ◽  
Vol 694 ◽  
pp. 620-624 ◽  
Author(s):  
Wan Yusmawati Wan Yusoff ◽  
Azman Jalar ◽  
Norinsan Kamil Othman ◽  
Irman Abdul Rahman
Keyword(s):  
Gamma Irradiation ◽  
Strain Curve ◽  
Stress And Strain ◽  
Flexural Stress ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Three Point Bending ◽  
Strain Behaviour ◽  
The Relationship ◽  
Different Doses

The aim of the research was to establish the relationship between stress-strain behaviour of single die Quad Flat No lead (SDQFN) and degradation by gamma irradiation. The SDQFN was exposed to Cobalt-60 with different doses from 0.5 Gy, 1.5 Gy, 5.0 Gy, 10.0 Gy and 50.0 kGy. The three-point bending technique was used to measure the flexural stress and strain of the package behaviour relations. After exposing with gamma radiation, the result showed the decreasing in the strength of the package behaviour of irradiated SDQFN when increasing the dose of gamma irradiation. The highest gamma irradiation dose used in this work produced the highest change in stress-strain behaviour of irradiated SDQFN.

scholarly journals Nonlinear Simulation of Stress-Strain Curve of Infill Materials Using PLP Fit Model

1970 ◽  
Vol 7 (1) ◽  
pp. 99-110
Author(s):  
Prajwal Lal Pradhan ◽  
C.V. R. Murty ◽  
Karl Vincent Hoiseth ◽  
Mohan Prasad Aryal
Keyword(s):  
Experimental Investigation ◽  
Modulus Of Elasticity ◽  
Stress Function ◽  
Strain Curve ◽  
Yield Limit ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Nonlinear Simulation ◽  
Strain Relationship ◽  
The Relationship

This paper puts forward an idealization of stress-strain curve of structural materials like bricks, and mortar. In this model, below yield limit, the pattern of the stress-strain relationship is assumed to be linear i.e. modulus of elasticity remains unchanged, whereas beyond the limit, the relationship is supposed to be curvilinear. A quadratic stress function is assumed to formulate the stress-strain curve passing through the points of yield stress sy and ultimate stress su. Experimental investigation on the cube-tests of specimen for brick samples and mortar cubes are also presented for the verification of idealized stress-strain relationships.Journal of the Institute of Engineering, Vol. 7, No. 1, July, 2009 pp. 99-110doi: 10.3126/jie.v7i1.2067

Experimental Study on Stress-Strain Relationship of New-Old Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 536-542
Author(s):  
Jian Yin ◽  
Yi Jin Li ◽  
Xiong Zhang ◽  
Shi Qiong Zhou
Keyword(s):  
High Performance ◽  
Full Range ◽  
Strain Curve ◽  
Compression Tests ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Rapid Repair ◽  
Strain Relationship ◽  
Relationship Of ◽  
Good Agreement

In this paper, full-range compression tests were conducted on prisms of Old concrete, New-Old concrete and High-Performance Rapid Repair Concrete (HPRRC) prisms The complete stress-strain curve of HPRRC incorporating PFAC (pulverized fly ash composite), Old concrete and New-Old concrete were obtained and compared with each other. The essential uniform deformation capacity of three kinds of concrete was verified with the experimental results. At the same time, the unified numerical expressions of the compressive complete stress-strain curves of the three kinds of concrete are put forward. The theoretical curves from calculation are in good agreement with the experimental curves.

The Bursting Pressure of Cylindrical and Spherical Vessels

1958 ◽  
Vol 25 (1) ◽  
pp. 89-96
Author(s):  
N. L. Svensson
Keyword(s):  
Internal Pressure ◽  
Excellent Agreement ◽  
Strain Curve ◽  
Experimental Results ◽  
Bursting Pressure ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
The Relationship

Abstract The relationship between pressure and change of dimensions for cylindrical and spherical vessels subjected to internal pressure is considered for a material having a stress-strain curve of the form σ = σ0ϵn. The equations obtained are analyzed further to obtain expressions for the bursting pressure for these vessels. From these results simplified expressions are obtained for the calculation of the bursting pressure for any vessel. Comparison with one set of experimental results shows excellent agreement.

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