High pressure and high strain rate behavior of cementitious materials experiments and elastic/viscoplastic modeling by Martin J. Schmidt

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Statementby Martin J. Schmidt
The Physical Object
Paginationxvi, 196 leaves :
Number of Pages196
ID Numbers
Open LibraryOL25907975M

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Full text of "High pressure and high strain rate behavior of cementitious materials: experiments and elastic/viscoplastic modeling" See other formats. The goal of this dissertation was to experimentally investigate the high rate and high pressure mechanical response of a mortar and concrete mix and use or develop a constitutive model able to describe the observed behavior.

Triaxial compression tests at a strain rate of / s, and for confining pressures ranging from 0 to GPa were by: 9. Cite this chapter as: Rivas Murillo J., Mohan R., Mohamed A. () Constitutive Material Models for High Strain Rate Behavior of Cementitious Materials from Material Chemistry—Molecular Dynamics Modeling Methodology with Illustrative Application to Author: J.

Rivas Murillo, R. Mohan, A. Mohamed. effect of strain rate and pressure, however it is unable to reflect the coupled effect of strain rate and lateral pressure reasonably. To solve the problem, this paper introduces a bi-axial model for concrete under high-strain rate conditions by combining HJC (Holmquist–Johnson–Cook) model and the bi-axial model proposed by Yan.

Engineered cementitious composite (ECC) is a cement-based material, commonly mixed with polyvinyl alcohol (PVA) fiber or polyethylene (PE) fiber as reinforcing materials. This paper reports the test results of ECC materials under high strain-rate compression, using a mm diameter split Hopkinson pressure bar (SHPB) by: 8.

In the experimental part of this investigation, a series of experiments have been carried out to provide data on the behavior of a G-mix concrete and mortar over the strain rate range of 10 −3 –10 4 s − focus of the experiments is on the part of the behavior at strain rates above 10 3 s −1 and under hydrostatic pressures of up to GPa.

This paper presents a micromechanical. The dynamic responses and failure models of metal material under high pressure and high strain are extremely complex. Especially, the failure analysis of metal material subjected to impact loading is intractable [1,2,3,4,5].This paper focuses on the failure behavior of metal projectile during high-speed impact into concrete slabs.

High strain-rate elastomeric polymers (HSREP) have been identified as promising structural materials in a wide range of applications, including shock mitigation, blast protection, and transparent armor applications [1,2].However, their use is critically limited by two mechanisms, namely degradation of HSREP by distributed damage or failure by fracture [3–6].

have been unavailable. The Holmquist-Johnson-Cook (HJC) constitutive model for concrete captures pressure and strain-rate-dependent strength behavior and void crushing damage behavior of porous materials reasonably well, is readily available in many hydrocodes, and is commonly used to simulate high-velocity penetration of concrete.

About this book Proceedings of the Fifth International Conference on the Effect of Hydrogen on the Behavior of Materials sponsored by the Structural Materials Division (SMD) Mechanical Metallurgy and Corrosion & Environmental Effects Committees of The Minerals, Metals & Materials Society held at Jackson Lake Lodge, Moran, Wyoming, September High strain rate unconfined compressional tests on concrete are simulated by a 3D discrete-element method.

The laboratory data set was provided by three unconfined experiments on a split Hopkinson. where, is strain rate, V bar is bar velocity and l s is specimen length.

For generating the strain rateand sec-1, the velocity of the striker bar to impact the input bar are keptand m sec-1, respectively which are calculated by using Eq. last end of output bar is kept fixed so that the load is allowed all three degree of freedom to avoid the wave deflection.

In view of the devastating outcomes of fires and explosions, it is imperative to research the dynamic responses of concrete structures at high temperatures. For this purpose, the effects of the strain rate and high temperatures on the dynamic tension behavior and energy characteristics of high-strength concrete were investigated in this paper.

Dynamic tests were conducted on high-strength. Furthermore, basalt fibers, recently widely investigated in structural applications, are also expected to present good performance in case of high strain-rate dynamic conditions.

The high-speed tensile tests were performed in a high-rate MTS testing machine. The same specimen geome-try as in quasi-static testing was used. The setup of the dynamic tensile testing is presented in Fig.

Once the Table 1 Mix proportions of SHCC under investigation. Material (kg/m3) Cement R-HS (Heidelberger Cement) Fly Ash He has been organized the ESHP series since launched from Kumamoto as to activate researches in explosion, shock-wave and high-strain-rate phenomena of various materials.

Raghukandan is an alumnus of Annamalai University, India and joined as a faculty in the highest strain rates (the fastest compressions) of the three. Experimental techniques such as diamond anvil–based precompression and ramped compression further expand the realm of feasible pressure and temperature combinations, allowing researchers to reproduce the relatively cool, high-pressure conditions of planetary interiors, for.

Georgin, J. and Reynouard, J. [] “ Modeling of structures subjected to impact: Concrete behavior under high strain rate,” Cement and Concrete. numerical study of compressive behavior of concrete at high strain rates High strain rate unconfined compressional tests on concrete are simulated by a three-dimensional discrete-element method.

The laboratory data set was provided by three unconfined experiments on a split Hopkinson pressure bar apparatus at very high strain rates. High performance concrete (HPQ has recently become a widely used concrete construction material for modem buildings, bridges, and pavements, etc.

To produce such a better quality of concrete, chemical and mineral admixtures such as fly ash, slag cement, and silica fume, ground granulated blast furnace slag, as well as air-entraining agents are commonly used in the field.

In solid mechanics, the Johnson–Holmquist damage model is used to model the mechanical behavior of damaged brittle materials, such as ceramics, rocks, and concrete, over a range of strain materials usually have high compressive strength but low tensile strength and tend to exhibit progressive damage under load due to the growth of microfractures.

Abstract. Pressure-shear plate impact (PSPI) tests commonly use Tungsten-Carbide (WC) as anvil plates, sandwiching the tested material. The common use of WC in these tests is due to its high impedance and high strength, allowing to reach high pressures, with an elastic response, enabling a straightforward analysis of the tested material.

techniques aimed to understand the dynamic behavior of the materials (metals, UHPC) in different failure modes (tension, compression, shear) at high strain-rate and in combination with high temperature. Keywords: High strain-rate, Hopkinson bar, Impact, Material. accompanied with a very high pressure in front of the wave.

Such The material models of concrete and steel were carefully chosen to represent the actual behavior of both materials. The concrete using a continuous cap material model.

The steel rebar was modeled using a material model with plastic deformation and strain rate effects. The. High strain rate unconfined compressional tests on concrete are simulated by a 3D discrete-element method.

The laboratory data set was provided by three unconfined experiments on a split Hopkinson pressure bar apparatus at very high strain rates (– s − 1).This numerical method was chosen because it is well adapted to problems involving the characterization of fracturing and.

extremely suddenly applied high pressure conditions and thus, involving material behaviours at the highest strain rates achievable, for example, in shock testing or in isentropic compression experiments (ICE). Current purview Here, the high strain rate properties of metals and alloys are reviewed with particular emphasis on the develop.

This experimental study investigates the strain-rate­ sensitive behavior of saturated cement paste and mor­ tar in compression. The stress-strain response of these materials is found to be significantly sensitive to the strain rate. The results indicate that the peak stress will increase with each order of magnitude increase in strain rate.

The shock Hugoniot relationship of concrete was studied based on concrete test subjected to the high-velocity impacting loading by one stage gas gun. The P-U(pressure-partical speed) shock Hugoniot relationship curve of concrete was gained from the D-U(shocking wave speed-partical speed) curve of concrete, and the equation of volume pressure P and volume strain v was put forward according to.

A strain-rate-dependent material model, including a strain-rate-sensitive term, has been developed through a strain-energy function for compressible Mooney-Rivlin hyperelastic solids. The model provided a good description of the compressive axial stress-strain response of the EPDM rubber at various strain rates under uniaxial strain conditions.

It is understood that the lateral inertia confinement, end-friction confinement, and aggregates influence the uniaxial dynamic compressive properties of concrete material.

For particular circumstan. Journal of the Dynamic Behavior of Materials is a peer reviewed archival journal on the science and engineering of material and structural response to dynamic loading focused on high strain-rate, impact, blast, penetration, and shock response.

The steel rebar was modeled using a material model with plastic deformation and strain rate effects. The penalty method was used for linking the concrete and the steel reinforcement joints. Such hot gases and high-pressure cause the wave to speed up to a certain level.

After a short period of time, the pressure behind the front of the blast. Dynamic Behavior of Materials, Volume 1: Proceedings of the Annual Conference on Experimental and Applied Mechanics, the first volume of six from the Conference, brings together 71 contributions to this important area of research and engineering.

High Strain Rate Testing of Biological and Soft Materials, Shock and High Pressure. strain gages mounted on the input and output bars during an experiment. These strain measurements are used to determine the time histories of the stress, strain and strain rate in the specimen during deformation.

Specifically, the stress and strain histories are [38], respectively, sðtÞ¼E b. High-velocity plate impact tests, drop-weight tests, and quasi-static tests using universal and Instron testing machines were used for the high strain rate ( s-1), medium strain rate ( s-1) and low strain rate ( s-1) tests, respectively.

into computer models that examine the behavior of concrete and other brittle materials as they are subjected to high strain, high strain rate events. THEORETICAL BACKGROUND The elastic moduli of concrete, mortar and cement samples were obtained by measurement of the ultrasonic velocities for the samples as a function of hydrostatic pressure.

After reviewing their formulation, a summary of their recent uses as numerical tools to investigate the mechanical behavior of soil, rock and concrete materials is given. Specific issues such as spherical discrete element packings, flow rules, capillarity effects, high-pressure loading response and high strain rate deformation are described in.

Ductility is a mechanical property commonly described as a material's amenability to drawing (e.g. into wire). In materials science, ductility is defined by the degree to which a material can sustain plastic deformation under tensile stress before failure.

Ductility is an important consideration in engineering and manufacturing, defining a material's suitability for certain manufacturing. The effect of loading rate on the external radial crack at different crack position angles plays an important role in the prediction of fracture behavior of plastic pipe materials.

For this reason, it is necessary to conduct a study for the fracture analysis of pipe ring specimens under tension loading with double external cracks at constant. Postulated by strength theory, the reference stress σ v must be derived from the three stresses σ t (tangential stress), σ r (radial stress), and σ n (normal stress) to allow an assessment of the service life.

The reference stress is then correlated with the material’s characteristic values. Transducers used in the ultra-high-pressure range (>10, bar) are designed such that the. The article was published as article 1 of the book Explosion Shock Waves and High Strain Rate Phenomena. Content from this work may be used under the terms of the Creative Commons Attribution licence.

Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. References.The dynamic behavior of concrete-like materials at strain rates between 10 1 and 10 2 s −1 is often studied in the SHPB experiment, while at high strain rates between 10 3 and 10 5 s −1, the behavior is often studied in the one-stage light gas gun experiment [1, 2].

The high pressure equation of state is often investigated by the one-stage.materials at high strain rate are usually different compared to the properties at quasi-static strain rate. The idea of testing materials under high strain rate load-ing was first brought out by J.

Hopkinson in [10]. 9, Later the method is used by B. Hopkinson [12] in by Kolsky [13]. The historical and chronological.

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