Preparation and Stress Calculation Analysis of Light Elastic-Plastic Material

Based on the photo-elastic method, four groups of different ratio light elastic-plastic material were prepared by changing the epoxy resin, the firming agent, the plasticizer mass ratio; and the light elastic-plasticity material stress-strain curve and its elastic modulus E and Poisson's ratio were obtained through the stretch experiment. The light elastic-plastic rail models were made by 1:5, and the computation analyzes stress distribution of the rail head of the heavy rail and carried on the static examination. The stress stripe chart change rule of the light elastic-plasticity material during load and unload process was observed.

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On Determining Elastic Modulus from Instrumented Indentation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.668.616 ◽

2013 ◽

Vol 668 ◽

pp. 616-620

Author(s):

Shuai Huang ◽

Huang Yuan

Keyword(s):

Finite Element ◽

Elastic Modulus ◽

Plastic Material ◽

Instrumented Indentation ◽

Computational Simulations ◽

Elastic Plastic ◽

Modified Method ◽

Plastic Materials ◽

Elastic Plastic Material ◽

Elastic Plastic Materials

Computational simulations of indentations in elastic-plastic materials showed overestimate in determining elastic modulus using the Oliver & Pharr’s method. Deviations significantly increase with decreasing material hardening. Based on extensive finite element computations the correlation between elastic-plastic material property and indentation has been carried out. A modified method was introduced for estimating elastic modulus from dimensional analysis associated with indentation data. Experimental verifications confirm that the new method produces more accurate prediction of elastic modulus than the Oliver & Pharr’s method.

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Analysis of the spherical indentation cycle for elastic–perfectly plastic solids

Journal of Materials Research ◽

10.1557/jmr.2004.0468 ◽

2004 ◽

Vol 19 (12) ◽

pp. 3641-3653 ◽

Cited By ~ 97

Author(s):

L. Kogut ◽

K. Komvopoulos

Keyword(s):

Plastic Deformation ◽

Finite Element ◽

Elastic Modulus ◽

Yield Strength ◽

Material Properties ◽

Deformation Behavior ◽

Plastic Material ◽

Elastic Plastic ◽

Loading And Unloading ◽

Elastic Plastic Material

A finite element analysis of frictionless indentation of an elastic–plastic half-space by a rigid sphere is presented and the deformation behavior during loading and unloading is examined in terms of the interference and elastic–plastic material properties. The analysis yields dimensionless constitutive relationships for the normal load, contact area, and mean contact pressure during loading for a wide range of material properties and interference ranging from the inception of yielding to the initiation of fully plastic deformation. The boundaries between elastic, elastic–plastic, and fully plastic deformation regimes are determined in terms of the interference, mean contact pressure, and reduced elastic modulus-to-yield strength ratio. Relationships for the hardness and associated interference versus elastic–plastic material properties and truncated contact radius are introduced, and the shape of the plastic zone and maximum equivalent plastic strain are interpreted in light of finite element results. The unloading response is examined to evaluate the validity of basic assumptions in traditional indentation approaches used to measure the hardness and reduced elastic modulus of materials. It is shown that knowledge of the deformation behavior under both loading and unloading conditions is essential for accurate determination of the true hardness and reduced elastic modulus. An iterative approach for determining the reduced elastic modulus, yield strength, and hardness from indentation experiments and finite element solutions is proposed as an alternative to the traditional method.

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Stress Distribution Determination Scheme for Elastic Plastic Material Based on Equivalent Inclusion Method

Inverse Problems in Engineering Mechanics III ◽

10.1016/b978-008043951-8/50025-4 ◽

2002 ◽

pp. 193-200 ◽

Cited By ~ 1

Author(s):

Toshihiro Kamhda ◽

Shigcru Koyama

Keyword(s):

Stress Distribution ◽

Plastic Material ◽

Elastic Plastic ◽

Equivalent Inclusion Method ◽

Inclusion Method ◽

Equivalent Inclusion ◽

Elastic Plastic Material

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Effects of a Temperature Cycle on an Elastic-Plastic Shrink Fit with Solid Inclusion

Journal of Mechanics ◽

10.1017/s1727719100001738 ◽

2000 ◽

Vol 16 (1) ◽

pp. 23-30 ◽

Cited By ~ 5

Author(s):

Werner Mack ◽

Manfred Plöchl ◽

Udo Gamer

Keyword(s):

Stress Distribution ◽

Plastic Material ◽

Yield Condition ◽

Material Behavior ◽

Temperature Cycle ◽

Solid Inclusion ◽

Flow Rule ◽

Elastic Plastic ◽

Elastic Plastic Material ◽

Shrink Fit

ABSTRACTThe stress distribution in a shrink fit with solid inclusion subject to homogeneous heating and subsequent cooling is investigated. It is presumed that both components are in a state of plane stress and exhibit the same elastic-plastic material behavior. Based on Tresca's yield condition and the associated flow rule, the modification of the stress distribution is studied analytically. In particular, the reduction of the interface pressure — and therefore of the transferable moment — caused by the occurrence of plastic deformation is discussed, and the criteria for the avoidance of yielding of the inclusion or full plasticization of the hub are given.

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Structural Integrity Research for Reactor Pressure Vessel Under In-Vessel Retention of a Core Melt

Volume 1: Operations and Maintenance, Aging Management and Plant Upgrades; Nuclear Fuel, Fuel Cycle, Reactor Physics and Transport Theory; Plant Systems, Structures, Components and Materials; I&C, Digital Controls, and Influence of Human Factors ◽

10.1115/icone24-60092 ◽

2016 ◽

Author(s):

Yongjian Gao ◽

Yinbiao He ◽

Ming Cao ◽

Yuebing Li ◽

Shiyi Bao ◽

...

Keyword(s):

Pressure Vessel ◽

Material Properties ◽

Power Plants ◽

Structural Integrity ◽

Plastic Material ◽

Plastic Region ◽

Reactor Pressure Vessel ◽

Elastic Plastic ◽

Elastic Plastic Material ◽

Reactor Pressure

In-Vessel Retention (IVR) is one of the most important severe accident mitigation strategies of the third generation passive Nuclear Power Plants (NPP). It is intended to demonstrate that in the case of a core melt, the structural integrity of the Reactor Pressure Vessel (RPV) is assured such that there is no leakage of radioactive debris from the RPV. This paper studied the IVR issue using Finite Element Analyses (FEA). Firstly, the tension and creep testing for the SA-508 Gr.3 Cl.1 material in the temperature range of 25°C to 1000°C were performed. Secondly, a FEA model of the RPV lower head was built. Based on the assumption of ideally elastic-plastic material properties derived from the tension testing data, limit analyses were performed under both the thermal and the thermal plus pressure loading conditions where the load bearing capacity was investigated by tracking the propagation of plastic region as a function of pressure increment. Finally, the ideal elastic-plastic material properties incorporating the creep effect are developed from the 100hr isochronous stress-strain curves, limit analyses are carried out as the second step above. The allowable pressures at 0 hr and 100 hr are obtained. This research provides an alternative approach for the structural integrity evaluation for RPV under IVR condition.

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Relationship Between Rockwell C Hardness and Inelastic Material Constants

Journal of Engineering Materials and Technology ◽

10.1115/1.1446863 ◽

2002 ◽

Vol 124 (2) ◽

pp. 179-184 ◽

Cited By ~ 3

Author(s):

Akihiko Hirano ◽

Masao Sakane ◽

Naomi Hamada

Keyword(s):

Finite Element ◽

Friction Coefficient ◽

Strain Hardening ◽

Yield Stress ◽

Plastic Material ◽

Stress And Strain ◽

Material Constants ◽

Elastic Plastic ◽

Elastic Plastic Material ◽

Hardening Coefficient

This paper describes the relationship between Rockwell C hardness and elastic-plastic material constants by using finite element analyses. Finite element Rockwell C hardness analyses were carried out to study the effects of friction coefficient and elastic-plastic material constants on the hardness. The friction coefficient and Young’s modulus had no influence on the hardness but the inelastic materials constants, yield stress, and strain hardening coefficient and exponent, had a significant influence on the hardness. A new equation for predicting the hardness was proposed as a function of yield stress and strain hardening coefficient and exponent. The equation evaluated the hardness within a ±5% difference for all the finite element and experimental results. The critical thickness of specimen and critical distance from specimen edge in the hardness testing was also discussed in connection with JIS and ISO standards.

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