Rosenhain Centenary Conference - 1. Engineering requirements 1.3 Materials requirements for offshore structures Discussion

1976 ◽  
Vol 282 (1307) ◽  
pp. 68-81
Keyword(s):  
Yield Stress ◽  
Structural Strength ◽  
Offshore Structures ◽  
Tangent Modulus ◽  
High Yield ◽  
Proportional Limit ◽  
Plate Girders ◽  
Beam Method ◽  
Definition Of ◽  
Major Reduction

The designer’s primary aims are avoidance of collapse and of unserviceability, generally through excessive deformation. These aims require knowledge of load extension characteristics. Structural strength depends on tangent modulus and deflexion on secant modulus so that premature departures from elasticity and proportionality are of importance. Definition of yield stress by the drop of beam method, while satisfactory for mild steel, may not be so for high yield materials particularly when structural stability is critical. The present definition of yield may have to be replaced by 0.2 % proof stress as has been common for light alloys. The influence of the limit of proportionality on structural strength has been observed in developing the design rules for plate girders for BS: 153, in the course of which tests undertaken on full-scale samples showed the proportional limit to be as low as 50 % of the nominal yield stress. The Tl steels in the U.S.A. exhibit major reduction in tangent modulus at about 85 % of their yield stress in compression.

Definition of the yield point in plasticity and its effect on the shape of the yield locus

1966 ◽  
Vol 1 (4) ◽  
pp. 331-338 ◽  
Author(s):  
T C Hsu
Keyword(s):  
Yield Point ◽  
Experimental Work ◽  
Strain Curve ◽  
Yield Locus ◽  
Experimental Results ◽  
Stress Strain Curve ◽  
Proportional Limit ◽  
Stress Strain ◽  
Small Section ◽  
Definition Of

Three different definitions of the yield point have been used in experimental work on the yield locus: proportional limit, proof strain and the ‘yield point’ by backward extrapolation. The theoretical implications of the ‘yield point’ by backward extrapolation are examined in an analysis of the loading and re-loading stress paths. It is shown, in connection with experimental results by Miastkowski and Szczepinski, that the proportional limit found by inspection is in fact a point located by backward extrapolation based on a small section of the stress-strain curve, near the elastic portion of the curve. The effect of different definitions of the yield point on the shape of the yield locus and some considerations for the choice between them are discussed.

Electrorheological fluid with an extraordinarily high yield stress

2002 ◽  
Vol 80 (5) ◽  
pp. 888-890 ◽  
Author(s):  
Yuling Zhang ◽  
Kunquan Lu ◽  
Guanghui Rao ◽  
Yu Tian ◽  
Shaohua Zhang ◽  
...  
Keyword(s):  
Yield Stress ◽  
Electrorheological Fluid ◽  
High Yield ◽  
High Yield Stress

Impact of Molecular Chain Structure of Suspension Phase on Giant Electrorheological Performance

2022 ◽  
Author(s):  
Hanqi Xu ◽  
Jinbo Wu ◽  
Yaying Hong ◽  
Weijia Wen
Keyword(s):  
Yield Stress ◽  
Chain Length ◽  
Colloidal Stability ◽  
Chain Structure ◽  
Solid Particles ◽  
High Yield ◽  
Suspension Stability ◽  
Chain Lengths ◽  
The Impact ◽  
Oil Particles

Abstract We demonstrate the impact of diester structure, in particular the alkyl chain length and branching structure, on the giant electrorheological (GER) effect and suspension stability. The existence of oil-particles interaction is of critical importance to induce the GER effect. To quantify GER performance and colloidal stability, we examine the yield stress, current density, field-off viscosity and sedimentation ratio with respect to the variation of chain length and branching structure. The oil-particles interaction is quantitatively analyzed by investigating the cluster size of particles in different diesters by a multiple light scattering analyzer, along with the wettability of different chain lengths of diesters and solid particles by the Washburn method. Our results indicate that long chain lengths favor the formation of particle agglomerates, thereby enhancing the GER effect (such as high yield stress). The attachment of branches on diester causes the formation of electronic correlation between branches and main chain, depending on the position of branches located, and hence results in superior GER performance and favorable suspension stability. An optimal GER fluid constituted by bis(2-ethylhexyl) sebacate is acquired with the achieved yield stress of 113 kPa at electric field strength of 4 kV/ mm and the prominent integrated GER properties.

A Mathematical Model Depicting the Stress-Strain Diagram and the Hysteresis Loop

1959 ◽  
Vol 26 (1) ◽  
pp. 95-100
Author(s):  
I. R. Whiteman
Keyword(s):  
Mathematical Model ◽  
Hysteresis Loop ◽  
Yield Stress ◽  
Frequency Distribution ◽  
Elastic Region ◽  
Tangent Modulus ◽  
Strain Diagram ◽  
Cumulative Frequency ◽  
Cumulative Frequency Distribution ◽  
Stress Strain

Abstract A model is made up of elastoplastic elements, all of which have the same value of Young’s modulus E, but which have different values of yield stress. It is shown that the dimensionless tangent modulus graph Et/E represents the cumulative frequency distribution of those elements which are in the elastic region. From the frequency distribution, the equations for the stress-strain diagram and the hysteresis loop can be written.

Development of a double magnetic circuit yield stress measurement device for magnetorheological fluid

2016 ◽  
Vol 28 (10) ◽  
pp. 1249-1259 ◽  
Author(s):  
Xiang-Fan Wu ◽  
Xing-Ming Xiao ◽  
Zu-Zhi Tian ◽  
Fei Chen ◽  
Jian Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Magnetic Circuit ◽  
Stress Measurement ◽  
Magnetorheological Fluid ◽  
High Yield ◽  
Magnetic Field Measurement ◽  
Measurement Device ◽  
Accuracy And Repeatability ◽  
The Magnetic Field

On the basis of shear working mode of magnetorheological fluid, in this article, a novel temperature controllable yield stress measurement device is designed, and the double magnetic circuit structure and the heating structure are proposed. And then, the magnetic field and temperature field of the measurement device are simulated, respectively, by the finite element method. Furthermore, several experiments are carried out to evaluate the magnetic field, measurement precision, and repeatability of the self-designed device. The results indicate that the proposed measurement device has uniform magnetic field distribution and controllable temperature and also has high yield stress testing accuracy and repeatability.

Extensive application of TMCP steel plates to ship hulls: 40 kgf/mm2 class high yield stress steel

1988 ◽  
Vol 1 (3) ◽  
pp. 219-243 ◽  
Author(s):  
Susumu Machida ◽  
Hiroshige Kitada ◽  
Hiroshi Yajima ◽  
Akinobu Kawamura
Keyword(s):  
Yield Stress ◽  
Steel Plates ◽  
High Yield ◽  
Ship Hulls ◽  
High Yield Stress

Removable equipment designed to transport timber: new engineering solutions and application of high-yield-stress steel

2020 ◽  
Vol 17 (1) ◽  
pp. 117-128
Author(s):  
N. A. Tanicheva ◽  
◽  
I. V. Fedorov ◽  
I. O. Filippova ◽  
◽  
...  
Keyword(s):  
Yield Stress ◽  
High Yield ◽  
High Yield Stress

Flow Behavior of Fe-3%Si Steel at High Temperatures and Strain Rates

2011 ◽  
Vol 704-705 ◽  
pp. 928-934
Author(s):  
Feng Hui An ◽  
Yu Hui Sha ◽  
Liang Zuo
Keyword(s):  
Yield Stress ◽  
Flow Behavior ◽  
Simulation Method ◽  
Strain Rate Range ◽  
High Yield ◽  
Strain Rates ◽  
Isothermal Compression ◽  
Steady State Flow ◽  
Hot Deformation Behavior ◽  
Controlling Mechanism

Hot deformation behavior of Fe-3%Si steel within temperature range of 1073~1473K and strain rate range of 0.01~5s−1was investigated by isothermal compression test using thermo-simulation method. Over the applied deformation conditions, steady state flow behavior was well described by the power law relationship with dislocation climb as the rate-controlling mechanism, and the high apparent activation energy can be attributed to the high yield stress. A modified Bergström model was proposed by introducing yield stress, and consequently the whole stress-strain curves can be accurately predicted.

Sign in / Sign up

Export Citation Format

Share Document