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Dynamic load testing

About: Dynamic load testing is a research topic. Over the lifetime, 7598 publications have been published within this topic receiving 88673 citations.


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Journal ArticleDOI
TL;DR: The properties of rocks under dynamic loading are important for the study of a whole range of rock mechanics and rock engineering problems, including blasting, protective design, explosives storage, rock bursts and seismic events as discussed by the authors.

624 citations

Journal ArticleDOI
TL;DR: The peridynamic analysis of dynamic crack branching in brittle materials is discussed in this article, where the authors show that peridynamics is a reliable formulation for modeling dynamic crack propagation.
Abstract: In this paper we discuss the peridynamic analysis of dynamic crack branching in brittle materials and show results of convergence studies under uniform grid refinement (m-convergence) and under decreasing the peridynamic horizon (δ-convergence) Comparisons with experimentally obtained values are made for the crack-tip propagation speed with three different peridynamic horizons We also analyze the influence of the particular shape of the micro-modulus function and of different materials (Duran 50 glass and soda-lime glass) on the crack propagation behavior We show that the peridynamic solution for this problem captures all the main features, observed experimentally, of dynamic crack propagation and branching, as well as it obtains crack propagation speeds that compare well, qualitatively and quantitatively, with experimental results published in the literature The branching patterns also correlate remarkably well with tests published in the literature that show several branching levels at higher stress levels reached when the initial notch starts propagating We notice the strong influence reflecting stress waves from the boundaries have on the shape and structure of the crack paths in dynamic fracture All these computational solutions are obtained by using the minimum amount of input information: density, elastic stiffness, and constant fracture energy No special criteria for crack propagation, crack curving, or crack branching are used: dynamic crack propagation is obtained here as part of the solution We conclude that peridynamics is a reliable formulation for modeling dynamic crack propagation

617 citations

Journal ArticleDOI
A. Marchand1, J. Duffy1
TL;DR: In this article, a series of experiments were described in which the local temperature and local strain are measured during the formation of an adiabatic shear band in a low alloy structural steel (HY-100).
Abstract: A series of experiments is described in which the local temperature and local strain are measured during the formation of an adiabatic shear band in a low alloy structural steel (HY-100). The specimen employed consists of a short thin-walled tube and the required rapid deformation rates are imposed by loading the specimen in a torsional Kolsky bar (split-Hopkinson bar). The local temperature is determined by measuring the infrared radiation emanating at twelve neighboring points on the specimen's surface, including the shear band area. Indium-antimonide elements are employed for this purpose to give the temperature history during deformation. In addition, high speed photographs are made of a grid pattern deposited on the specimen's surface, thus providing a measure of the strain distribution at various stages during shear band formation. By testing a number of specimens, it is possible to form a picture of the developing strain localization process, of the temperature history within the forming shear band, and of the consequent loss in the load carrying capacity of the steel. It appears that plastic deformation follows a three stage process which begins with a homogeneous strain state, followed by a generally inhomogeneous strain distribution, and finally by a narrowing of the localization into a fine shear band. It is estimated that the shear band propagates at a speed of about 510 m/s in the material tested. Results also include data on the stress-strain behavior of HY-100 steel over the temperature range —190°C to 250°C and at quasi-static as well as dynamic strain rates.

557 citations

Journal ArticleDOI
TL;DR: In this paper, a simple shock model based upon a rate-independent, rigid, perfectly-plastic, locking (r-p-p l) idealisation of the stress-strain curves for wood is proposed to provide a first order understanding of the dynamic response.

527 citations

Journal ArticleDOI
TL;DR: In this paper, a load-testing of an energy pile installed in London Clay was carried out over a period of about seven weeks, with conventional loading tests carried out either side of an extended loading test with thermal cycles.
Abstract: Very limited information is available regarding the impact of heating and cooling processes on the geotechnical performance of piled foundations incorporating pipe loops for ground-source heat-pump systems (so-called energy piles). A pile-loading test that incorporated temperature cycles while under an extended period of maintained loading was undertaken to investigate the behaviour of an energy pile installed in London Clay. Testing was carried out over a period of about seven weeks, with conventional loading tests carried out either side of an extended loading test with thermal cycles. Using an optical fibre sensor system, and other more conventional instrumentation, temperature and strain profiles were observed in the test pile, an adjacent bore-hole, two of the anchor piles, and the heat sink pile. Details of load and movement at the pile head, of ambient air temperature and of the input/output temperature of fluid within the heating system were also recorded. Thermodynamic behaviour observed during t...

523 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202386
2022170
2021256
2020307
2019338
2018287