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Thursday, July 23, 2020 | History

3 edition of Integrated research in constitutive modelling at elevated temperatures. found in the catalog.

Integrated research in constitutive modelling at elevated temperatures.

Integrated research in constitutive modelling at elevated temperatures.

final report

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  • 29 Currently reading

Published by Mechanics and Materials Center, Texas A&M University, National Aeronautics and Space Administration, National Technical Information Service, distributor in College Station, Tex, [Washington, DC, Springfield, Va .
Written in English


Edition Notes

Statementby W.E. Haisler and D.H. Allen
SeriesNASA contractor report -- NASA CR-177237
ContributionsAllen, David H., 1950-, United States. National Aeronautics and Space Administration
The Physical Object
FormatMicroform
Pagination1 v
ID Numbers
Open LibraryOL14985483M

A summary is given of the constitutive equations that have been developed for use in design assessments of elevated temperature components of liquid metal fast breeder reactors. The discussion addresses representations of short-term (plastic) and long-term (creep) inelastic material responses. An anisotropic constitutive model based on crystallographic slip theory was formulated for nickel-base single crystal superalloys. The current equations include both drag stress and back stress state variables in the inelastic flow equation for slip in each slip system. Experiments were conducted to evaluate the need of back stress in the model.

Structures in Fire Proceedings of the Ninth International Conference (SiF’16,) June , , Princeton University. Edited bv: Maria E. Moreyra Garlock, Princeton University and Venkatesh K.R. Kodur, Michigan State University. ISBN: , June , pages, 6×9, soft cover. The shear modulus G 50 at 50% peak strength also depends on temperature. Several plotting techniques are used to show the existence of different state boundary surfaces for each test temperature. Key words: sand–bentonite, buffer, compression, shear strength, temperature, modelling.

ally efficient constitutive model for the matrix constituent in such systems. Furthermore, because of the proposed elevated operation temperatures for which these systems are designed, the required constitutive models must account for both time-dependent and time-independent deformations. For example considering that most aerospace engine. His research focused on experimental behavior and analytical modeling of structural systems under earthquake, extreme fire conditions, post-earthquake fire hazard, retrofitting of building and structures due to earthquake, constitutive modeling of material properties at elevated temperatures, Fire resistance design of structural systems, and.


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Integrated research in constitutive modelling at elevated temperatures Download PDF EPUB FB2

Integrated research in constitutive modelling at elevated temperatures. (OCoLC) Microfiche: Haisler, Walter E. Integrated research in constitutive modelling at elevated temperatures.

(OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource. Integrated research in constitutive modelling at elevated temperatures. (OCoLC) Online version: Haisler, Walter E.

Integrated research in constitutive modelling at elevated temperatures. (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.

Get this from a library. Integrated research in constitutive modelling at elevated temperatures. Part 1: final report. [Walter E Haisler; David H Allen; United. A comprehensive model describing the relationship of the flow stress, strain rate and temperature of the alloys at elevated temperatures is proposed by compensation of strain and strain rate.

The validity of descriptive results based on the proposed constitutive equation is also investigated. Experiments and resultsCited by: High strain rates testing and constitutive modeling of BB reinforcing steel at elevated temperatures Article in The European Physical Journal Special Topics ().

Jun Cai, Jiamin Shi, Kuaishe Wang, Fuguo Li, Wen Wang, Qingjuan Wang, and Yingying Liu (). A modified parallel constitutive model for elevated temperature flow behavior of Ti-6Al-4V alloy based on multiple regression.

International Journal of Materials Research: Vol. No. 7, pp. On the basis of the experimental results, a revised constitutive model describing the relationship among the flow stress, strain rate, and forming temperature of the TC4 alloy at elevated. The hot deformation behavior of a high strength aluminum alloy (Al-Zn-Mg-Cu) was studied by isothermal hot compression tests performed over a range of temperatures (– °C) and strain rates (–1 s −1).A constitutive equation was established using experimental results to predict the flow stress of the alloy under elevated temperature.

The high temperature deformation behavior of 05Cr17Ni4Cu4Nb stainless steel was investigated at the temperatures from to °C and strain rates from to 10s-1 on Gleeble thermo-simulation machine. The stress-strain curves at lower strain rate ( s-1) exhibit a single peak stress, indicating a typical dynamic recrystallization (DRX) behavior of the steel, but at.

However, there are few constitutive models for Inconel which are suitable for the cutting process. In this research, firstly, dynamic behavior of Inconel at high strain rate and elevated temperature of the same order as the practical cutting process was obtained using SHPB(Split Hopkinson Pressure Bar) test.

This book presents the work done by the RILEM Technical Committee HPB (Physical properties and behaviour of High-Performance Concrete at high temperature).

It contains the latest research results on the modelling of concrete behaviour at high temperature. Based on the above analysis, the high-temperature creep constitutive model can be established by the following procedures.

Firstly, the values of A, B, C, h, H * and K c should be obtained by nonlinearly fitting the creep strain-creep time curves under the given creep temperature and applied stress. Generally, the minimum applied stress are. Integrated research in constitutive modelling at elevated temperatures, part 1: NTRS Full-Text: View Document [PDF Size: MB ] Author and Affiliation: experimental lab development; comparison of models at room temperature; comparison of models at elevated temperature; and integrated software development.

Publication Date: J A constitutive model of concrete subjected to elevated temperature is suggested in this study. The model is composed of four strain components: free thermal strain, mechanical strain, thermal creep strain, and transient strain due to moisture.

The thermal creep strain of concrete is derived from the modified power-law relation for steady state creep. The nominal performance of structural aluminum alloys at elevated temperature has been thoroughly investigated in the past.

This book provides a constitutive model which allows for accurate. Elevated temperature in the machining process is detrimental to cutting tools—a result of the effect of thermal softening and material diffusion. Material diffusion also deteriorates the quality of the machined part.

Measuring or predicting machining temperatures is important for the optimization of the machining process, but experimental temperature measurement is difficult and inconvenient. In this study temperature dependent compressive strength and elastic modulus relationship have been proposed for concrete under elevated temperature and fire.

The proposed model fits well with the experimental data and compared with other available models. This model will be further implemented into computing software for future research.

@article{osti_, title = {Constitutive equations for meeting elevated-temperature-design needs}, author = {Pugh, C E and Robinson, D N}, abstractNote = {Constitutive equations for representing the inelastic behavior of structural alloys at temperatures in the creep regime are discussed from the viewpoint of advances made over the past decade.

Numerical models considering strain rate and temperature effects only usually give unsatisfactory results when applied to multiscan laser forming operations. This is mainly due to the inadequate constitutive models employed to describe the hot flow behavior.

The deformation behavior of pure copper was studied in hot compression tests in the temperature range of – K and strain rate interval of – s–1, the corresponding flow stress curves were plotted. The new method to calculate critical and saturation stresses was devised, quantitative analysis of strain hardening and dynamic softening was presented, a three-stage constitutive.

Characterization of heat transfer coefficient for non-isothermal elevated temperature forming of metal alloys. Kaab Omer, Clifford Butcher Original Research. Charles Chermette, Klaus Unruh Pages Original Research. Hot deformation behavior of 7A04 aluminum alloy at elevated temperature: constitutive modeling and verification.

In the proposed model, the dependences of creep strain on the creep temperature, external stress, and creep time are well taken into account. A good agreement between the predicted and measured creep strains shows that the established creep constitutive model can give an accurate description of the creep behaviors of aluminum alloy.Research Papers.

An Experimental Comparison of Several Current Viscoplastic Constitutive Models at Elevated Temperature G. H. James, G. H. James Aerospace Engineering Department, Texas A&M University, College Station, Texas The models used include Bodner’s anisotropic model, Krieg, Swearengen, and Rhode’s model, Schmidt and Miller.