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2 edition of Mechanical behaviour of copper at high strain rates found in the catalog.

Mechanical behaviour of copper at high strain rates

A. G. Walker

Mechanical behaviour of copper at high strain rates

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Published .
Written in English


Edition Notes

Thesis(Ph.D.) - Loughborough University ofTechnology 1987.

Statementby A.G. Walker.
ID Numbers
Open LibraryOL19653446M

Strain hardening rates of 6 GPa at high strains (>30%) in dual-phase alloys exceed previously reported hardening levels and open up new possibilities for designing high strength and toughness materials. Central to obtaining superior toughness in dual-phase HEAs is the propensity for deformation twinning of the phases involved. Viscoplasticity is a theory in continuum mechanics that describes the rate-dependent inelastic behavior of solids. Rate-dependence in this context means that the deformation of the material depends on the rate at which loads are applied. The inelastic behavior that is the subject of viscoplasticity is plastic deformation which means that the material undergoes unrecoverable deformations when a. Materials with high strength and high ductility are widely attractive for industrial applications general, the yield strength of materials is determined by the grain size according to the Hall-Petch relation 2, and the ductility (especially uniform elongation) is governed by the strain hardening rate (, where and are true stress and true strain, respectively) according to plastic Cited by: There exist relatively fewer studies on the mechanical behavior of TWIP steels at high strain rate regime (> /s). Split-Hopkinson experiments are the most widely used and reliable techniques for testing the materials in the strain rate .

The book presents twelve state of the art contributions in the field of numerical modeling of materials subjected to large strain, high strain rates, large pressure and high stress triaxialities, organized into two sections. The first part is focused on high strain rate-high pressures such as those.


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Mechanical behaviour of copper at high strain rates by A. G. Walker Download PDF EPUB FB2

Mechanical behaviour of copper at high strain rates This item was submitted to Loughborough University's Institutional Repository by the/an author.

Additional Information: • A Doctoral Thesis. Submitted in partial ful lment of the requirements for the award of Doctor of Philosophy of Mechanical behaviour of copper at high strain rates book Universit.y.

Mechanical behaviour of copper at high strain rates Author: Walker, A. Awarding Body: Loughborough University of Technology Current Institution: Loughborough University Date of Award: Availability of Full Text:Author: A.G.

Walker. Mechanical Behavior of Metals at Extremely High Strain Rates (Materials Science Surveys) [Buchar, J., Bilek, Z., Dusek, F.] on *FREE* shipping on qualifying offers. Mechanical Behavior of Metals at Extremely Mechanical behaviour of copper at high strain rates book Strain Rates (Materials Science Surveys)Cited by: HIGH STRAIN-RATE MECHANICAL BEHAVIOUR OF A COPPER MATRIX COMPOSITE FOR NUCLEAR APPLICATIONS L.

Peroni*, M. Scapin Politecnico di Torino, Department of Mechanical and Aerospace Engineering, Corso Duca degli Abruzzi, 24 – Turin, Italy *@ Keywords: metal matrix composite, strain-rate, temperature, Johnson-Cook Abstract.

Mechanical behaviour of copper at high strain rates The primary objectives of this research were to determine the macroscopic properties of polycrystalline OFHC copper for various grain sizes over a wide range of strain rates and temperatures, and to relate the properties to the fundamental microscopic mechanisms which control the deformation characteristics of the : A.G.

Walker. HIGH STRAIN RATE BEHAVIOUR OF COPPER Fig. 1 shows stress-strain rate diagrams at various strains for the two gra des of copper. Although there is some scattering of the experimental points, the data are well rationalized by the classical linear relationship a = 0 + (1) where 0 and depend on strain as reported in Table : J.C.

Giannotta, G. Regazzoni, F. Montheillet. Elastoplastic behavior of copper upon high-strain-rate deformation Article in The Physics of Metals and Metallography (6) June with 6 Reads How we measure 'reads'.

Notched specimens in pure copper and Remko iron were tested over a range of stress-rate conditions and strain-rates. Copper showed reducing failure strains with Mechanical behaviour of copper at high strain rates book stress triaxiality, strain-rate having little effect.

Remko iron, however, exhibited a ductile-brittle transition at high states of stress intensity and at the higher strain-rates. These proceedings of EXPLO the International Conference on the Materials Effects of Shock-Wave and High-Strain-Rate Phenomena, Mechanical behaviour of copper at high strain rates book Augustin La Jolla, California, represent a global and up-to-date appraisal of this field.

Contributions (more than ) deal with high-strain-rate deforma. Mechanical behaviour of copper at high strain rates book Material Behaviour at High Strain Rates.

is modified by placing a combination of copper and steel pulse shapers on the impact surface of the incident bar. mechanical behavior under very.

The mechanical responses and crystallographic texture evolution of four representative aluminum alloy sheets (2xxx, 5xxx, 6xxx and 7xxx series), commonly used in the transportation industry, are studied under reverse shear loading in this work.

The monotonic and forward-reverse simple shear tests are carried out to obtain the stress-strain by: 2. The Taylor impact behavior of polyetheretherketone (PEEK) was also used to investigate its dynamic failure behavior [11] and high strain rate mechanical properties [12]. A comprehensive work on the Taylor impact testing of polycarbonate (PC) reported underlying physical mechanisms of high strain rate behavior of glassy polymers possessing the multiple relaxation processes by Sarva et al.

[3]. Song B, Chen W, Antoun B, Frew D () Determination of early flow stress for ductile specimens at high strain rates by using a SHPB. Exp Mech 47(5)– doi: Cited by: 2. Notched specimens in pure copper and Remko iron were tested over a range of stress-rate conditions and strain-rates.

Copper showed reducing failure strains with increased stress triaxiality, strain-rate having little effect. Remko iron, however, exhibited a ductile-brittle transition at high states of stress intensity and at the higher : J.L.

Sturges, D.C. Barton, G.H. Majzoobi, P. Church. This paper presents a comprehensive study of the strain rate and grain size dependence of the mechanical properties of OFHC copper, including an investigation of the.

Chen Y, Clausen AH, Hopperstad OS, Langseth M () Stress-strain behavior, of aluminium alloys at a wide range of strain rates. Int J Solids Struct – Google Scholar Khlif M, Grolleau V, Masmoudi N, Bradai C, Rio G () Development of a new test ing method for polymer materials at high strain by: 1.

High strain rate tensile behavior of aluminum alloy T and IS mild steel, ASME Journal of Engineering Materials and Technology, paper numberpp HIGH STRAIN AND STRAIN-RATE BEHAVIOUR OF PTFE/ALUMINIUM/TUNGSTEN MIXTURES John Addiss1, Jing Cai2, Stephen Walley1, William Proud1, Vitali Nesterenko2, 3 1Cavendish Laboratory, Madingley Road, Cambridge, CB3 2Materials Science and Engineering Program, Unive rsity of California San Diego, CA USA 3Department of Mechanical and Aerospace Engineering, Author: John Addiss, Jing Cai, Stephen Walley, William Proud, Vitali F.

Nesterenko. Materials at High Strain Rates. T.Z. Blazynski. Springer 43 MECHANICAL PROPERTIES OF METALLIC MATERIALS AT HIGH RATES OF STRAIN stainless steel adiabatic shear bands alloys aluminium behaviour Blazynski brittle materials ceramics composite materials compressive Conf copper crack curves deformation density dependence developed.

The mechanical behavior of OFHC copper at strain rates from 10 −3 to 10 3 sec −1 at °, °, and °K was investigated. The strain rate behavior of copper can be divided into two regions.

Below 10 sec −1 the dislocation motion is thermally activated over forest dislocation barriers. Above 10 3 sec −1, a linear relationship between stress and strain rate was observed indicating Cited by: High strain rate properties of metals and alloys R.

Armstrong*1 and S. Walley2 The high strain rate dependence of the flow stress of metals and alloys is described from a dislocation mechanics viewpoint over a range beginning from conventional tension/compression.

Data di pubblicazione: Abstract: Aim of this work is the investigation of mechanical behaviour of an alumina dispersion strengthen ed copper, known by the trade name GLIDCOP, subjected to dynamic loads: it is a composite material with a copper matrix strengthened with aluminium oxide ceramic particles.

Since the particle content is quite small the material keeps the OFE copper Cited by: 1. In: Constitutive Relation in High/Very-High Strain Rates, ed. by K. Kawata, J. Shioiri (Springer, Berlin Heidelberg ) pp. 49–58 Google Scholar F. Kamler, P. Niessen, R.J. Pick: Measurement of the behaviour of high-purity copper at very high rates of strain, Canad.

Two experimental works concerning the behaviour of dislocations at high rates of strain in polycrystalline OFHC copper are reported. The first work is time resolved measurements of the ultrasonic attenuation and velocity in specimens undergoing dynamic deformation.

The highest strain rate imposed was about 80 / by: 4. Quasi-static and high strain rate tensile tests, with strain rates ranging from s⁻¹ to s⁻¹, revealed that the tensile strength of both conventional and UFA samples increases with. Mechanical properties at high strain rates E. El-Magd Aachen Technical University, Augustinerlach 4, Aachcn, Gemany Abstract In the range of high strain rates, the mechanical behaviour of materials is characterized by an increased.

relatively small specimen size and extremely high strain rate make it impractical to study with sufficient fidelity the mac- roscopic mechanical behavior including flow stress, strain hardening response and strain to failure in copper withFile Size: 1MB. developed at high strains and strain rates.

The experimental method subjects a thin (- pm) region of copper to very high strains (y - 5) at high strain rates (7 - 10~s-I).

Upon completion of deformation, the region is cooled to one-half the original temperature change in less than one millisecond. Copper with four widely differing grain sizes was subjected to high-strain-rate plastic deformation in a special experimental arrangement in which high shear strains of approximately 2 to 7 were generated.

The adiabatic plastic deformation produced temperature rises in excess of K, creating conditions favorable for dynamic recrystallization, with an attendant change in the mechanical Cited by: strain behaviour at large strains from high strain rate tensile and shear experiments, International Journal of Impact Engineering (), doi: /ng This is a PDF file of an unedited manuscript that has been accepted for by: Buchar J, Bilek Z and Dusek F Mechanical Behaviour of Metals at Extremely High Rates of Strain (Switzerland: Trans.

Tech. Publications) p Chiem C Y Impact Loading and Dynamic Behaviour of Materials ed C Y Chiem, H-D Kunze and L W Meyer (Oberursel: DGM Informationsgesellschaft) pp Cited by:   Strain rate is the reciprocal of time. Longer times are related to lower strain rates while shorter times are related to higher strain rates.

Therefore, lower strain rates mimic the behavior observed at higher temperatures while higher strain rates reflect the behavior at lower temperatures.

Figure 1 shows an example of this principle. Fracture Behavior of Copper with Different Strain Rate at Room Temperature, International Journal of Mechanical Engineering and Technology 8(10),pp.

– The objective of this study is to investigate the mechanical behavior of copper thin film with different thicknesses subjected to varying strain rates. A micro-force tensile testing machine (MTS Tytron ) was used to test the polyimide samples coated with different thicknesses of copper ( nm, nm, nm, and nm).

The experiments were conducted by applying test vehicles to Author: Kuan Jung Chung, Chi Feng Lin, W. Chiang. Finite element simulations were conducted for all solders at strain rates of s-1 to s Results on fracture behaviour agreed well to the experiments.

All studied solder compositions revealed ductile deformation behaviour changing only little with strain rate. A higher silver content as well as copper presence lead to higher yield.

Mechanical Behaviors of -Titanium Alloy at High Rates of Strain. Journal de Physique copper in the high strain rate ranges can be understood in connection with the strong evolution of s91n rate, and mechanical behaviour was discussed based on the thermally activated process conceptCited by: 1.

MECHANICAL BEHAVIOR OF RUBBER AT HIGH STRAIN RATES FIG. – Time/temperature shift factors for PI from mechanical and dielectric spectroscopies Typically segmental modes are measured at low T and chain modes at high T, leading to large extrapolation Size: 1MB.

Strain-Rate Dependence of Flow Stress • The average strain rate during most tensile tests is in the range of to /s, which correspond to time of 30s to 5min to reach a strain of • When temperature is held constant, stress and strain rate relation can be described by a power-law expression, where m is called the strain-rate File Size: 2MB.

Abstract: In this paper was studied dynamic behavior of the armor steels Armox T and Secure by testing specimens in quasi-static tensile test with strain rate 1∙ s-1 and high-speed tensile test within range of intermediate strain rates from s-1 to s-1 at the room temperature.

Hardness test and quasi-static tensile test confirmed material properties specified by the. 1. Introduction.

Since the pioneering experiments of Kolsky [], the split Hopkinson bar has been used to measure the mechanical properties of polymers under high strain rate loading and to explore rate dependence in these of the earliest studies was by Chou et al.

[], who examined four polymers between 10 −4 and 10 3 s −1.A more comprehensive investigation was Cited by:. @article{osti_, pdf = {Modeling Large-Strain, High-Rate Pdf in Metals}, author = {Lesuer, D R and Kay, G J and LeBlanc, M M}, abstractNote = {The large strain deformation response of T6 and Ti-6Al-4V has been evaluated over a range in strain rates from 10{sup -4} s{sup -1} to over 10{sup 4} s{sup -1}.

The results have been used to critically evaluate the strength and.Experimental results on the high strain rate response of polycrystalline metals are download pdf, with emphasis on the behavior of pure metals. A strong increase in flow stress with increasing strain rate is reported for strain rates of approximately 10 5 s −1 and higher.

This increase is observed in pressure-shear plate impact experiments at nominally constant strain rates from 10 5 s −1 to Cited by:   Mechanical testing. Compression of the pillars was performed at temperatures ebook 25, and °C using a modified Alemnis Ebook indenter inside a Zeiss DSM SEM [].The high vacuum (5 × 10 −5 mbar) of the SEM chamber both simplifies the heat transfer situation inside the system and prevents oxidation of the samples, which is a significant consideration for by: