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on the nature of the yield point phenomenon

on the nature of the yield point phenomenon

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On the nature of the yield point phenomenon - ScienceDirectMar 01, 2013 · Most efforts to explain the yield phenomenon and Lüders strain in metals are based on micromechanical approaches, such as the Cottrell–Bilby theory or dislocation multiplication mechanisms , . Problems arise with the explanation of the temperature dependence of the yield phenomenon and the level of the lower yield strength . In many cases, the stress level at the lower yield strength is …Cited by: 114Publish Year: 2013Author: Rainer Schwab, Volker Ruff

Yield point | mechanics | Britannica

The yield point, alternatively called the elastic limit, marks the end of elastic behaviour and the beginning of plastic behaviour. When stresses less than the yield point are removed, the material returns to its original shape. For many materials that do not have a well-defined yield point, a quantity called yield strength is substituted. Yield strength is the stress at which a material has undergone some arbitrarily Yield point phenomenon - University of BabylonYield point phenomenon Metals, particularly low-carbon steel, show a localised heterogeneous transition from elastic to plastic deformation. Yield point elongation. The load after the upper yield point suddenly drop to approximately constant value (lower yield point) and then rises with further strain.Yield Point: Definition, Curve & Elongation | Study on the nature of the yield point phenomenonMaterials can be anything from concrete to steel to glass. So what exactly is the yield point of a material? Yielding, in our day-to-day language, means to give in to force, pressure or demands. In the case of materials, the idea is the same - a material is said to have yielded when it changes shape after the application of force or when it has 'given in'. For example, when you stretch a rubber band you essentially apply a force on it with your hands and the rubber band yields or deforms. The yield point is the point aSee more on study on the nature of the yield point phenomenon

Yield Point Phenomena in Metals and Alloys | SpringerLink

The remaining chapters deal, in turn, with the various alloys exhibiting yield point phenomena. Thus, chapter 2 on mild steel, is a more extensive study of quench and strain ageing, while Chapter 3 is on the refractory metals and discusses theories of the low-temperature strength.Yield Point Phenomena in Metals and Alloys | E. Hall on the nature of the yield point phenomenonYield Point Phenomena in Metals and Alloys. Exceptions to the rule are always interesting, and the anomalies in the stress-strain curves of mild steel and in many other metals and alloys have excited the curiosity of engineers and scientists for well over a hundred years. Yet it is only during the last twenty years that significant theoretical advances have been made, and the aim of this book has Why Yield Point Phenomenon is prominent in low carbon on the nature of the yield point phenomenonYield point phenomenon is understood to occur when stress drops down drastically because the locked in dislocations are set free. The dislocations are locked in due to presence of carbon in case of on the nature of the yield point phenomenon

The nature of the yield ought to be estimated in light of on the nature of the yield point phenomenon

of the yield with the built up standard (Armstrong, 2009a, 2009b). The nature of the yield ought to be estimated in light of the fact that the worker could accomplish the amount required however with low quality. For instance, if a secretary is approached to type 20 letters every day and the person in question does as such however with a ton of spelling botches, they should type it over and over.The Yield-Point Phenomenon and Cyclic Plasticity of the on the nature of the yield point phenomenonThe yield-point phenomenon (YPP) is the result of a rapid increase in the number of mobile dislocations [1] and [2] and is common in iron [3], low-alloy steels [4] and [5], titanium alloys [6], aluminium [7] and [8], tantalum [9] and [10] and several other metallic alloys [11] The Yield-Point Phenomenon and Cyclic Plasticity of the on the nature of the yield point phenomenonThe Yield-Point Phenomenon and Cyclic Plasticity of the Console Beam %K yield-point phenomenon, cyclic plasticity, mechanical testing, FEM simulations %X In the paper, the influence of the yield-point phenomenon (YPP) on cyclic plasticity of the console beam is presented with the objective to demonstrate the impact of the YPP on the local on the nature of the yield point phenomenon

The Yield Point Phenomenon (Objective) : Materials on the nature of the yield point phenomenon

The Yield Point Phenomenon . Objectives . To study and understand the yield point phenomenon that is observed in some materials (and in particular exhibited in mild steels). Characterization of tensile properties of mild steel.The Yield Point Phenomenon (Methodology) : Materials on the nature of the yield point phenomenonThe Yield Point Phenomenon.. Objective . Theory . Methodology . Results . on the nature of the yield point phenomenon The test is stopped soon after the the yield drop is observed and the sample is unloaded. New gauge length and the new area of cross-section are noted and the tensile test restarted. This time the test is conducted till fracture.The Yield Phenomena of a Medium Carbon Steel under Non-uniform yielding of the metal is shown to be more pronounced for dynamic straining and, like static yielding, to be an integral part of the lower yield stress phenomenon. The manner in which all these factors are affected by normalizing the steel is shown. A special form of deformation of the steel peculiar to rapid straining is indicated.Some results are removed in response to a notice of local law requirement. For more information, please see here.

Relationship between yield point phenomena and the on the nature of the yield point phenomenon

To investigate the relationship between pop-in behavior and yield point phenomena, four sets of tests were performed: just before, right after, 30 h after, and 3 weeks after the 6% tensile prestrain. For each of these conditions, a total of 64 indentations were made in an 8 × 8 array with 4 m spacing between the indents, as shown in Fig. 1 .On the nature of the yield point phenomenonOn the nature of the yield point phenomenon. Materials in which the yield point phenomenon occurs exhibit a characteristic drop in the stressstrain curve at the end of the elastic (or mainly elastic) region. In most cases the subsequent plastic deformation takes place locally in deformation bands, often termed Lüders bands.On the nature of the yield point phenomenonMaterials in which the yield point phenomenon occurs exhibit a characteristic drop in the stressstrain curve at the end of the elastic (or mainly elastic) region. In

On the nature of the yield point phenomenon - ScienceDirect

Mar 01, 2013 · Most efforts to explain the yield phenomenon and Lüders strain in metals are based on micromechanical approaches, such as the CottrellBilby theory or dislocation multiplication mechanisms , . Problems arise with the explanation of the temperature dependence of the yield phenomenon and the level of the lower yield strength . In many cases, the stress level at the lower yield strength is Cited by: 114Publish Year: 2013Author: Rainer Schwab, Volker RuffOn the nature of the yield point phenomenon - ScienceDirectIn this paper, a new and simple macromechanical model is presented to explain the yield point phenomenon. It is based on three major points: (i) a realistic or true upper yield point, (ii) typical strain-hardening behaviour common to many materials and (iii) the triaxiality of the stress state that necessarily has to develop at the Lüders front and that determines the stress level at the lower yield strength.Cited by: 114Publish Year: 2013Author: Rainer Schwab, Volker RuffOn the nature of the "double" yield point in Ti 50 Ni 25 on the nature of the yield point phenomenonMar 01, 2017 · The anomalous phenomenon of the "double" yield point attributed with the "crystal amorphous state" phase transition during high-pressure torsion of Ti 50 Ni 25 Cu 25 alloy has been analyzed experimentally and theoretically. Satisfactory correlation between experimental data and theoretical hypothesis has been found. <P />Cited by: 3Publish Year: 2017Author: A. M. Glezer, L. S. Metlov, L. S. Metlov, R. V. Sundeev, A. V. Shalimova

Mechanism of the High Temperature Yield Point

A new type yield point phenomenon observed in some binary aluminium alloys such as Al-Mg and Al-Cu which are deformed at high temperatures above about 350°C has been reported in a previous papar. The present paper is devoted to a detailed explanation of the mechanism which controls the high temperature yield point phenomenon.Lüders Bands Phenomenon in ASTM E8 Tensile Testing - At the yield point, a band of deformed meta, sometimes visible appears at a point of stress concentration. Coincident with the formation of Lüders bands, the load drops and the band begins to propagate along the length of the specimen. In certain industries these can be INDIAN INSTITUTE OF TECHNOLOGY - IIT KanpurDuring tensile deformation materials initially deform elastically and the yield point marks the onset of plastic deformation. For most materials the transition from elastic to plastic deformation is gradual and hence do not exhibit a sharp transition point. Such materials show engineering stress versus engineering-strain curves as shown here.

Double yield point - SlideShare

Jan 20, 2013 · 6. We can also see the double yield point phenomenon in polythene. Under mechanical deformations, three grades of polythene which differ mainly in terms of branch content exhibit two yield points. The first yield point occurs at low applied strains and marks the onset of temporary plastic deformation; The second yield point occurs at higher strains and marks the onset of Discontinuous Elongation/YieldingThe reappearance of the yield point is due to the diffusion of carbon and nitrogen atoms to the dislocations during the aging period to form new atmospheres of interstitials anchoring the dislocations.Computational Studies for the Yield-Point Phenomenon of on the nature of the yield point phenomenonAug 03, 2020 · Strongly related to the well-known Cottrell atmosphere, the yield-point phenomenon (YPP) is an intriguing yielding behavior often observed in some alloys and metals such as an annealed or aged low carbon steel. Generally, in a uniaxial tensile test, prominently heightened yielding point and subsequent stress tumble with fluctuation can epitomize this phenomenon.Cited by: 1Publish Year: 2020Author: Jaehyun Kim, Do-Nyun Kim

Causes of the yield-point phenomenon in commercial on the nature of the yield point phenomenon

Results show that the yield point is caused by precipitate pinning. Furthermore, precipitation is enhanced by pre-strain, which can be introduced by elevated- temperature working, rapid cooling, or tensile elongation at room temperature. Aging is effective between 400 and 760 deg C, depending on the type of pre- strain, iron content, and texture.

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