Study of static and dynamic fracture using strain measurements by John R. Berger

Cover of: Study of static and dynamic fracture using strain measurements | John R. Berger

Published by U.S. Dept. of Commerce, National Institute of Standards and Technology, Order from National Technical Information Service in Boulder, Colo, [Springfield, VA .

Written in English

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Subjects:

  • Fracture mechanics.,
  • Strains and stresses -- Measurement.,
  • Strain gages.

Edition Notes

Book details

StatementJohn R. Berger, James W. Dally.
SeriesNISTIR -- 3952.
ContributionsDally, James W., National Institute of Standards and Technology (U.S.)
The Physical Object
Paginationxi, 175 p. :
Number of Pages175
ID Numbers
Open LibraryOL17680561M

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Get this from a library. Study of static and dynamic fracture using strain measurements. [John R Berger; James W Dally; National Institute of Standards and Technology (U.S.)].

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The fracture tests were simulated and the effect of pre-crack length was discussed under static conditions, while the effect of strain rate was studied in a dynamic situation (Izod tests). The following main conclusions were drawn: (i) As far as the static fracture test is concerned, the existence of a pre-crack influences the propagation of the crack, and the numerical FE model captures this by: 1.

The primary objective of this study is to predict the intrinsic fracture toughness from the apparent fracture toughness of notched specimen. For this reason, critical average stress fracture model is suggested based on linear elastic fracture by: One distinguishing feature of dynamic problems in fracture is the necessity for time-resolved observations and measurements of the fracture event.

Cracks may grow in solids at speeds comparable to the characteristic wave speeds, typically in the range of about m/s for most common materials. Prior to the dynamic evaluation, three-point bend experiment were also conducted under the quasi-static conditions to evaluate the static fracture toughness using standard formulations available in the : Anoop Kumar Pandouria, Purnashis Chakraborty, Sanjay Kumar, Vikrant Tiwari.

The present study is purposed to establish evaluation methods on dynamic and static fracture toughness of ceramics. That is static fracture toughness of partially stabilized zirconia and Si^S^ is evaluated by static three point bending test using a precracked by:   An experimental investigation is conducted to study the quasi-static and dynamic fracture behaviour of sedimentary, igneous and metamorphic rocks.

The notc The time to fracture, crack speed and velocity of the flying fragment are measured by strain gauges, crack propagation gauge and high-speed photography on the macroscopic by: The static and dynamic fracture toughness of ASTM A CA C and A Cr.B C steels in the wide range of temperature including the upper shelf have been measured and their behavior.

The SHPB is used in the present study to perform dynamic three-point bend test in order to measure fracture toughness. The strain rate of the specimen is measured using the strain gauges attached.

The dynamic fracture experiment was conducted using Torsional Spilt Hopkinson Bar. In both cases, the torque corresponding to fracture initiation is measured experimentally and used as input to.

Model. The tibia model with internal fixation has been prepared using the element solutions have been performed in the ANSYS Workbench [].The bone model has been taken from the relevant website [] and cross-sectional measurements have been modeled according to measurements in the anterior and lateral views [].The dimensions of the three Author: Serkan Erdem, Mustafa Gür, Mete Onur Kaman.

The dynamic fracture toughness values were found up to 3 times higher than quasi-static ones, especially for out-of-plane loading direction. The microstructural analysis confirmed (obtained from load-displacement graphs) the brittle deformation mechanism of samples without plastic by: 5. We study the static and dynamic fracture properties of free-standing monolithic nanoporous gold as a function electrochemical potential using Cited by: Purchase Dynamic Fracture - 1st Edition.

Print Book & E-Book. ISBNIn Study of static and dynamic fracture using strain measurements book study, the static and dynamic bulk moduli (K static and K dynamic) were measured at varying effective stress for dry and fluid‐saturated Westerly granite with controlled fracture densities under isotropic and differential stress states.

Isotropic fracturing of different densities was induced in samples by thermal treatment toCited by: 7 fracture modes under dynamic and static loads were studied to understand the 8 fracture modes of rock under dynamic and static loads.

The Split-Hopkinson pres. The accuracy of static and cyclic strain measurements using photogrammetry as a function of the measuring rate is investigated. This measuring method, also known as digital image correlation (DIC), enables noncontact measurement of deformations on the surface of structural elements by means of an applied pattern.

The purpose of this review is to discuss the development and the state of the art in dynamic testing techniques and dynamic mechanical behaviour of rock materials.

The review begins by briefly introducing the history of rock dynamics and explaining the significance of studying these issues. Loading techniques commonly used for both intermediate and high strain rate tests and measurement Cited by:   Abstract. This work deals with quasi-static and dynamic fracture behaviors of Additively Manufactured (AM) ABS coupons.

In this research, planar specimens have been additively printed using a heated circular nozzle producing a continuous bead of mm diameter and mm layer thickness in the build by: 2.

Dynamic Tensile Deformation of Aluminum Alloy T6 and OA Direct strain measurements using. In the present study, the quasi-static and dynamic yield and flow behavior of Al   Dynamic fracture in solids has attracted much attention for over a century from engineers as well as physicists due both to its technological interest and to inherent scientific curiosity.

Rapidly applied loads are encountered in a number of technical applications. In some cases such loads might be applied deliberately, as for example in problems of blasting, mining, and comminution or 5/5(1).

In this paper, based on splitting tests of Brazilian discs, the tensile strength and failure pattern of concrete and mortar were investigated under quasi-static and dynamic loadings with a strain Cited by: 8.

This study aims to explore dynamic behaviours of fracturing and damage evolution of rock materials at the grain scale. A grain-based discrete element method (GB-DEM) is proposed to reveal microscale characterisation and mineral grain compositions of rock materials realistically.

Micro-parameters of GB-DEM are obtained by calibrating quasi-static strengths, elastic modulus, stress–strain Cited by: Similar results were obtained by Penning and coworkers using their design of a dynamic fixator.

13,21 – 22 Klein et al. in their small study showed that dynamization of the wrist at 3 weeks may lead to improved function. 23 Our study revealed significant advantage in terms of anatomical restoration and early functional outcome of early.

The objective of this study is to evaluate the mechanical properties of static, quasidynamic and dynamic fracture toughness of glass-filled ceramic as promising structural material for a dome port cover of a ramjet engine system. Static and quasi-dynamic tests were carried out using SEPB (Single Edge Pre-cracked Beam) specimens.

Static and dynamic fracture toughness tests were also Author: Jae Hoon Kim, Duck Hoi Kim, Nam Su Rho, Young Shin Lee, Song Heo Koo, Soon Il Moon.

measured statically or dynamically, but the two measurements are often different. In this study, the static and dynamic bulk moduli (K static and K dynamic) were measured at varying effective stress for dry and fluid-saturated Westerly granite with controlled fracture Cited by:   The transition between ‘static’ and ‘dynamic’ friction in a model system is found to be quantitatively captured by the same theoretical framework as is used to describe brittle fracture Cited by: The failure moment was ± 95 Nm and did not differ significantly with loading direction.

A method was developed to estimate the elastic-plastic material properties of the bone using both force-deflection data and strain gauge measurements.

The bone material appeared to yield at about one third of the ultimate strain level prior to by: @article{osti_, title = {Development and Advanced Analysis of Dynamic and Static Casing Strain Monitoring to Characterize the Orientation and Dimensions of Hydraulic Fractures}, author = {Bruno, Michael and Ramos, Juan and Lao, Kang}, abstractNote = {Horizontal wells combined with multi-stage hydraulic fracturing have been applied to significantly increase production from low.

The basic postulates of bone fracture healing include static bone compression and immobilisation/fixation for three weeks and intermittent dynamic loading treatment afterwards. The optimal mechanical strain should be in the range of –2, microstrain, depending on the frequency of the strain application, type of bone and location in the Cited by: @article{osti_, title = {Evaluation of static and dynamic fracture toughness in ductile cast iron}, author = {Kobayashi, Toshiro and Yamada, Shinya}, abstractNote = {Ductile cast irons have been explored as a cask (container for spent nuclear fuel) material because of their low cost and good formability.

The cask, which is a huge casting with mm thickness and Mg weight, envelops. An experimental investigation is conducted to study the quasi-static and dynamic fracture initiation toughness of Ti/TiB Kalthoff [10] presents a review work on the measurement of dynamic fracture toughness of materials.

He concluded that The load history at the specimen/bar interface is obtained from the recorded strain data using a one. Three-Dimensional Dynamic Fracture Analysis Using the Material Point Method Y.

GUO1 and J. NAIRN2 1. Material Science & Engineering, University of Utah, Salt Lake City, UtahUSA 2. Wood Science & Engineering, Oregon State University, Corvallis, OR,USA Abstract: This paper describes algorithms for three-File Size: KB. Such capability is allowing the validation of novel and alternative non-destructive experimental methods of strain measurement or computational models of complex deformation processes.

This study describes the first dynamic contact strain measurement of a ball bearing using stroboscopic Energy Dispersive X-ray Diffraction (EDXD).Cited by:   Moreover, in this study, FEA was used with the primary goal of comparing various fixation methods by measuring the interfragmentary motions, with the ultimate goal of assessing more important parameters, such as the stress or strain distribution within the bone and implant, which are difficult and likely impossible to experimentally by: In this study, a coupled numerical- experimental technique has been developed to estimate the fracture parameters of both ductile and brittle materials.

The approach is applied to a set of smooth and notched specimens of a dual phase steel targeting at specific stress states and tested in tension at dynamic rates to extract the fracture : Sarath Chandran, Patricia Verleysen.

Development of fracture mechanics / D.P. Rooke --The boundary element method / C.A. Brebbia --Application of the boundary element method to fracture mechanics / M.H. Aliabadi --Dynamic fracture mechanics / V.Z.

Parton --Fundamentals of dynamics and BEM for dynamic fracture mechanics / J. Domínguez & R. Gallego --Cracking of strain-softening. Strain measurement using strain gauges requires mechanical attachment to the tested material and hence a fairly large volume of specimen is needed [8].

In high strain test using SHB, the strain gauge is not attached directly to the specimen and may not fully capture the evolution of strain occurring during high strain-rate by: 5. @article{osti_, title = {Dynamic fracture toughness of VAR steel under conditions of plane strain}, author = {Lee, Y and Prakash, V}, abstractNote = {Plate impact experiments are conducted to study the dynamic fracture processes in VAR steel which occur on submicrosecond timescales.

These experiments involve the plane strain loading of a planar crack by a plane tensile pulse. Static Testing Of Fracture Toughness Using Compact Tension Configuration A Compact Tension Test Specimen (hib ) Made Of Material A Is Designed And Tested According To The ASTM E Procedure.

Accordingly, A Type I Load Versus Displacement (Pvs. V) Test Record Was Obtained The Specimen Dimensions Were Determined Asb 0 Cm, -5 Cm, A 5 Cm.The experimental study (Kulin et al., ) conducted on propagation toughness measurement only focused on two strain rates that represent quasi-static and dynamic loading and did not investigate a wide range of strain rates.

Furthermore, the experiments were carried out using equine cortical by: @article{osti_, title = {Static, dynamic toughness, and high strain rate properties of maragingHY, and HP steels}, author = {Prado, M E and Cordill, C A}, abstractNote = {HY had the greatest amount of toughness and Maraging the least.

Instrumented impact tests, which provided dynamic properties, indicated a 90/sup 0/C (/sup 0/F) shift in nil ductility.

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