Study on the cohesive edge crack in a square plate with the cohesive element method

AbstractThe size of the fully developed process zone (FDPZ) is needed for the arrangement of displacement sensors in fracture experiments and choosing element size in numerical models using the cohesive element method (CEM). However, the FDPZ size is generally not known beforehand. Analytical solutions for the exact FDPZ size only exist for highly idealised bodies, e.g. semi-infinite plates. With respect to fracture testing, the CEM is also a potential tool to extrapolate laboratory test results to full-scale while considering the size effect. A numerical CEM-based model is built to compute the FDPZ size for an edge crack in a finite square plate of different lengths spanning several magnitudes. It is validated against existing analytical solutions. After successful validation, the FDPZ size of finite plates is calculated with the same numerical scheme. The (FDPZ) size for finite plates is influenced by the cracked plate size and physical crack length. Maximum cohesive zone sizes are given for rectangular and linear softening. Further, for this setup, the CEM-based numerical model captures the size effect and can be used to extrapolate small-scale test results to full-scale.

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Evaluation of Wearing Pipe for Subsea Mining With Large Particles in Slurry Transportation

Volume 6: Ocean Space Utilization ◽

10.1115/omae2015-41217 ◽

2015 ◽

Author(s):

Satoru Takano ◽

Masao Ono ◽

Sotaro Masanobu

Keyword(s):

Full Scale ◽

Small Scale ◽

Pipe Material ◽

Test Results ◽

Material Loss ◽

Large Particles ◽

Fundamental Understanding ◽

Maximum Particle ◽

Scale Test ◽

Set Up

For a fundamental understanding of pipe wear under hydraulic transportation of deep-sea mining, a small scale test is conducted because there are many restrictions in conducting a full scale test. The small scale test apparatus are set up using the pipes of about 80mm in diameter and the rocks of which maximum particle diameters are about 20mm are used. In the test, the pipe materials and the pipe inclination are changed to evaluate the differential of the amount of pipe material loss. Furthermore, the amount of the pipe material loss in full scale is estimated based on the small scale test results.

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Racking strength of paperboard based sheathing materials

BioResources ◽

10.15376/biores.2.1.3-19 ◽

2006 ◽

Vol 2 (1) ◽

pp. 3-19

Author(s):

Wu Bi ◽

Douglas W. Coffin

Keyword(s):

Elastic Modulus ◽

Load Transfer ◽

Full Scale ◽

Small Scale ◽

Test Results ◽

Wall Construction ◽

Materials Used ◽

Insight Into

Small-scale racking testers were developed for use as a means to evaluate paperboard-based sheathing materials used in framed wall-construction. For the purpose of evaluating the performance of different sheathing materials, the tester provides an economic alternative to standard full-scale racking tests. In addition, results from testing provide practical insight into the racking response of framed and sheathed walls. The load-deformation responses of three commercial sheathing boards were measured, and initial racking stiffness and racking strength were proposed as parameters for characterizing the board. The racking test results showed that the initial paperboard racking stiffness correlated to elastic modulus and caliper, but the response was insensitive to paperboard orientation or test dimensions. Observations and results showed that both panel buckling and paperboard cutting at the staples affected the racking response, but the dominating factor influencing the racking response appears to be load transfer through the staples.

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Field Installation Tests of Monopod Suction Pile and Tripod Suction Buckets

Volume 6: Polar and Arctic Sciences and Technology; Offshore Geotechnics; Petroleum Technology Symposium ◽

10.1115/omae2013-10100 ◽

2013 ◽

Cited By ~ 2

Author(s):

D. Kwag ◽

Myounghak Oh ◽

OSoon Kwon ◽

S. Bang

Keyword(s):

Field Tests ◽

Full Scale ◽

Small Scale ◽

Site Conditions ◽

Test Results ◽

Scale Field ◽

Penetration Force

Small-scale field tests on a monopod suction pile with and without the detachable penetration apparatus (DPA) and tripod suction buckets have been performed. One of the objectives of the field tests was to identify the capability of the DPA at small-scale and to obtain useful information for planned future full-scale field tests. The DPA which has been developed to control and increase the accuracy of the verticality of monopod suction piles during installation. In addition, it can also contribute to increase the penetration force under certain conditions. Included in this paper are the details of the small-scale field tests, including the site conditions, suction pile details, DPA details, installation, instrumentation equipment, and test results. Results indicate that the tripod suction buckets have a significant advantage over the monopod suction pile for verticality control and that the newly developed DPA is fully capable of enhancing the verticality control of the monopod suction pile during installation.

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Experimental study of the strength and durability of metal-composite high-pressure tanks

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2019-85-1-i-49-56 ◽

2019 ◽

Vol 85 (1(I)) ◽

pp. 49-56 ◽

Cited By ~ 2

Author(s):

A. M. Lepikhin ◽

V. V. Moskvichev ◽

A. E. Burov ◽

E. V. Aniskovich ◽

A. P. Cherniaev ◽

...

Keyword(s):

High Pressure ◽

Strain State ◽

Full Scale ◽

Fracture Mechanisms ◽

Metal Composite ◽

Test Results ◽

Stress Strain ◽

Pneumatic Pressure ◽

Stress Strain State ◽

Composite Tank

The results of unique experimental studies of the strength and service life of a metal-composite high-pressure tank are presented. The goal of the study is to analyze the fracture mechanisms and evaluate the strength characteristics of the structure. The methodology included tests of full-scale samples of the tank for durability under short-term static, long-term static and cyclic loading with internal pneumatic pressure. Generalized test results and data of visual measurements, instrumental and acoustic-emission control of deformation processes, accumulation of damages and destruction of full-scale tank samples are presented. Analysis of the strength and stiffness of the structure exposed to internal pneumatic pressure is presented. The types of limiting states of the tanks have been established experimentally. Change in the stress-strain state of the tank under cyclic and prolonged static loading is considered. Specific features of the mechanisms of destruction of a metal-composite tank are determined taking into account the role of strain of the metal liner. The calculated and experimental estimates of the energy potential of destruction and the size of the area affected upon destruction of the tank are presented. Analysis of test results showed that the tank has high strength and resource characteristics that meet the requirements of the design documentation. The results of the experiments are in good agreement with the results of numerical calculations and analysis of the stress-strain state and mechanisms of destruction of the metal-composite tank.

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Predicting Roof Diaphragm and Endwall Stiffness From Full-Scale Test Results of a Metal-Clad, Post-Frame Building

Transactions of the ASAE ◽

10.13031/2013.28690 ◽

1992 ◽

Vol 35 (3) ◽

pp. 977-985 ◽

Cited By ~ 2

Author(s):

K. G. Gebremedhin ◽

J. A. Bartsch ◽

M. C. Jorgensen

Keyword(s):

Full Scale ◽

Test Results ◽

Full Scale Test ◽

Frame Building ◽

Scale Test

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Upscaling THM modeling from small-scale to full-scale in-situ experiments in the Callovo-Oxfordian claystone

International Journal of Rock Mechanics and Mining Sciences ◽

10.1016/j.ijrmms.2020.104582 ◽

2021 ◽

Vol 144 ◽

pp. 104582

Author(s):

D.M. Seyedi ◽

C. Plúa ◽

M. Vitel ◽

G. Armand ◽

J. Rutqvist ◽

...

Keyword(s):

Full Scale ◽

Small Scale ◽

In Situ Experiments

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Electromechanical fields in a hollow piezoelectric cylinder under non-uniform load: flexoelectric effect

Mathematics and Mechanics of Solids ◽

10.1177/10812865211020785 ◽

2021 ◽

pp. 108128652110207

Author(s):

Olha Hrytsyna

Keyword(s):

Analytical Solutions ◽

Point Group ◽

The Body ◽

Small Scale ◽

Gradient Theory ◽

Local Mass ◽

Wide Range ◽

Mass Displacement ◽

Local Mass Displacement ◽

Local Gradient

The relations of a local gradient non-ferromagnetic electroelastic continuum are used to solve the problem of an axisymmetrical loaded hollow cylinder. Analytical solutions are obtained for tetragonal piezoelectric materials of point group 4 mm for two cases of external loads applied to the body surfaces. Namely, the hollow pressurized cylinder and a cylinder subjected to an electrical voltage V across its thickness are considered. The derived solutions demonstrate that the non-uniform electric load causes a mechanical deformation of piezoelectric body, and vice versa, the inhomogeneous radial pressure of the cylinder induces its polarization. Such a result is obtained due to coupling between the electromechanical fields and a local mass displacement being considered. In the local gradient theory, the local mass displacement is associated with the changes to a material’s microstructure. The classical theory does not consider the effect of material microstructure on the behavior of solid bodies and is incapable of explaining the mentioned phenomena. It is also shown that the local gradient theory describes the size-dependent properties of piezoelectric nanocylinders. Analytical solutions to the formulated boundary-value problems can be used in conjunction with experimental data to estimate some higher-order material constants of the local gradient piezoelectricity. The obtained results may be useful for a wide range of appliances that utilize small-scale piezoelectric elements as constituting blocks.

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