Elastic-plastic constraint parameterAfor test specimens with thickness variation

2016 ◽  
Vol 39 (8) ◽  
pp. 939-949 ◽  
Author(s):  
G. P. Nikishkov ◽  
Yu. G. Matvienko
Keyword(s):  
Thickness Variation ◽  
Elastic Plastic ◽  
Plastic Constraint

scholarly journals Specimen thickness effect on elastic-plastic constraint parameter A

2015 ◽  
Vol 9 (33) ◽  
pp. 73-79 ◽  
Author(s):  
G.P. Nikishkov ◽  
Yu.G. Matvienko
Keyword(s):  
Thickness Effect ◽  
Specimen Thickness ◽  
Elastic Plastic ◽  
Plastic Constraint

Validation on the Relationship Between J Integral and CTOD for Offshore Structural Steel Weldments by Experimental and Numerical Analyses

2014 ◽  
Author(s):  
Dong Hyun Moon ◽  
Jeong Soo Lee ◽  
Jae Myung Lee ◽  
Myung Hyun Kim
Keyword(s):  
Plastic Deformation ◽  
Crack Tip ◽  
J Integral ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Constraint Factor ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Plastic Constraint ◽  
The Relationship

Elastic plastic fracture mechanics (EPFM) is the domain of fracture analysis which considers extensive plastic deformation at crack tip prior to fracture. J integral and crack tip opening displacement (CTOD) have been commonly used as parameters for EPFM analysis. The relationship between these parameters has been extensively studied by industry and academia. The plastic constraint factor can serve as a parameter to characterize constraint effects in fracture involving plastic deformation. Therefore, the characteristics of plastic constraint factor are important in EPFM analysis. In this study, the relationship between J Integral and CTOD was investigated by conducting fracture toughness tests using single edge notched bend (SENB) specimens. Also, plastic constraint factor was investigated by using finite element analysis. Numerical analysis was carried out using ABAQUS elastic-plastic analysis mode.

Elastic-plastic stress distributions and limit angular velocities in rotating hyperbolic annular discs

2007 ◽  
Vol 221 (2) ◽  
pp. 137-142 ◽  
Author(s):  
N N Alexandrova ◽  
P M M Vila Real
Keyword(s):  
Rotational Speed ◽  
Yield Criterion ◽  
Circumferential Stress ◽  
Radial Pressure ◽  
Thickness Variation ◽  
Flow Rule ◽  
Stress Distributions ◽  
Elastic Plastic ◽  
Angular Velocities ◽  
Hyperbolic Form

Plastic analytical stress analysis of a rotating annular disc with its contours being free from the radial pressure and with specifically variable thickness is presented in terms of the Mises-yield criterion and its associated flow rule. The hyperbolic form of thickness variation is considered and optimized towards the maximum rotational speed and favourable stress combinations. Radial and circumferential stress distributions in the disc both in the intermediate elastic-plastic and in the limit plastic states are obtained. As a particular case, limit elastic angular velocity parameter is derived. The influences of rotational speed as well as the disc's thickness profile on the plastic solution and size of elastic-plastic zone are demonstrated and discussed. The results obtained may be used for the correct implementation of numerical codes and preliminary engineering design.

scholarly journals Effect of Hardening Exponent of Power-Law Hardening Elastic-Plastic Substrate on Contact Behaviors in Coated Asperity Contact

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1965 ◽  
Author(s):  
Xiqun Lu ◽  
Hanzhang Xu ◽  
Bin Zhao
Keyword(s):  
Power Law ◽  
Coating Thickness ◽  
Plastic Material ◽  
Contact Load ◽  
Plastic Substrate ◽  
Thickness Variation ◽  
Asperity Contact ◽  
Elastic Plastic ◽  
Specific Contact ◽  
Elastic Plastic Material

The contact between a rigid flat and a coated asperity is studied using the finite element method. The substrate is assumed as the power-law hardening elastic–plastic material. The effect of the hardening exponent of the substrate (n) on the contact behaviors including contact load, area, coating thickness variation and stress in the coating, is investigated. It shows larger hardening exponent results in larger contact loads and larger maximum stresses in the coating at a given interference, and leads to smaller contact area at a specific contact load. The coating thickness becomes smaller monotonically as the interference increases for larger hardening exponents, while it recovers gradually after reaching the minimum value for the smaller n cases. This work will give some universal guidance to improve the contact performance for coatings by adjusting the hardening exponent of the substrate and by optimizing the coatings parameters.

Numerical Analysis of Electrodeposited Nickel Coating in Multistage Drawing Processes

2005 ◽  
Vol 127 (2) ◽  
pp. 233-243 ◽  
Author(s):  
L. Q. Zhou ◽  
Y. P. Li ◽  
Y. C. Zhou
Keyword(s):  
Finite Element ◽  
Nickel Coating ◽  
Steel Substrate ◽  
Shell Element ◽  
Thickness Variation ◽  
Central Difference ◽  
Elastic Plastic ◽  
Central Difference Method ◽  
Electrodeposited Nickel ◽  
Work Hardening Model

The elastic-plastic finite element method of a dynamic explicit algorithm was used to simulate the deep drawing processes of nickel coating electrodeposited on a steel substrate to form an advanced battery shell. The Belytschko-Wong-Chiang shell element was used to mesh the materials, the kinematical work-hardening model was adopted for the components, and the tied-with-failure contact criterion was given to the interfacial combination. The rate-type elastic-plastic constitute law was employed to handle the large deformation, and the central difference method was utilized to solve the finite element equations. The simulations of the materials in the first and final processes illustrated that the steel substrate and the nickel coating were simultaneously deformed and yielded in the die fillet profile and the flange area. The thickness variation of the nickel coating and steel substrate was dependent on the main principal stress, and their variation rule was consistent. In the entire drawing processes, the thinnest region after forming was at the lower part of the cup near the cup bottom, the extent of the coating being thinned after drawing was acceptable, and the material was capable of forming the battery shell. The simulated results were partly compared with tests and other analysis and showed good agreement.

Some Quantification Problems in Parallel EELS Images

1990 ◽  
Vol 48 (2) ◽  
pp. 36-37
Author(s):  
G. Botton ◽  
G. L’Espérance ◽  
M.D. Ball ◽  
C.E. Gallerneault
Keyword(s):  
Electron Microscope ◽  
Imaging System ◽  
Signal To Noise Ratio ◽  
Scanning Transmission Electron Microscope ◽  
Acquisition Time ◽  
Thickness Variation ◽  
Transmission Electron ◽  
Distribution Of Elements ◽  
Scanning Transmission ◽  
Present Distribution

The recently developed parallel electron energy loss spectrometers (PEELS) have led to a significant reduction in spectrum acquisition time making EELS more useful in many applications in material science. Dwell times as short as 50 msec per spectrum with a PEELS coupled to a scanning transmission electron microscope (STEM), can make quantitative EEL images accessible. These images would present distribution of elements with the high spatial resolution inherent to EELS. The aim of this paper is to briefly investigate the effect of acquisition time per pixel on the signal to noise ratio (SNR), the effect of thickness variation and crystallography and finally the energy stability of spectra when acquired in the scanning mode during long periods of time.The configuration of the imaging system is the following: a Gatan PEELS is coupled to a CM30 (TEM/STEM) electron microscope, the control of the spectrometer and microscope is performed through a LINK AN10-85S MCA which is interfaced to a IBM RT 125 (running under AIX) via a DR11W line.

Elasto-plastic state of curve beam system subjected to complex loading

1996 ◽  
Vol 18 (4) ◽  
pp. 14-22
Author(s):  
Vu Khac Bay
Keyword(s):  
Cylindrical Shell ◽  
Solution Method ◽  
Complex Loading ◽  
Numerical Results ◽  
Elastic Solution ◽  
Plastic State ◽  
Curve Beam ◽  
Elastic State ◽  
Elastic Plastic ◽  
Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

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