Results 101 to 110 of about 4,946 (135)

Improving the Pullout Strength of Pedicle Screws by Screw Coupling

Journal of Spinal Disorders, 2001
The objective of this study was to determine the effect of pedicle screw coupling on the pullout strength of pedicle screws in the osteoporotic spine. The vertebral bone mineral density (BMD) of 33 cadaveric lumbar vertebrae were measured by quantitative computed tomography. Pedicle screws were inserted into each pedicle.
T, Suzuki, E, Abe, K, Okuyama, K, Sato
openaire   +2 more sources

Effect of Insertion Torque on Bone Screw Pullout Strength

Orthopedics, 2001
ABSTRACT The effect of insertion torque on the holding strength of 4.5-mm ASIF/AO cortical bone screws was studied in vitro. Screw holding strength was determined using an lnstron materials testing machine (Bristol, United Kingdom) on 55 lamb femora and 30 human tibiocortical bone sections.
K J, Lawson, J, Brems
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Staple Leg Profile Influence on Pullout Strength

Clinical Orthopaedics and Related Research, 1996
Bone staples have widespread applicability in orthopaedic surgery. Their use, however, is limited by inconsistent quality of fixation. Prior studies have shown potential for improvement in the reliability of staple fixation through a change in the design of the staple legs.
K K, Firoozbakhsh, T A, DeCoster, M S, Moneim, M S, McGuire, F F, Naraghi   +4 more
openaire   +2 more sources

Predicted Pullout Strength of Sheet-Piling Interlocks

Journal of the Soil Mechanics and Foundations Division, 1973
A theoretical study was made to determine the role of material properties and interlock dimensions in the pullout strength of steel sheet piling. Pullout occurs after large plastic rotations and strain hardening develop in the interlocks. A lower-bound analysis including an effective strain-hardening stress was developed and compared with experimental ...
openaire   +1 more source

Pullout Strength of Concrete

1977
A proposed method of nondestructive testing for pullout strength of hardened concrete is under consideration by the American Society for Testing and Materials' Committee C-9 on Concrete and Concrete Aggregates. Interest in the method is due to current emphasis on construction safety and recognition that strength of concrete should be measured in ...
openaire   +1 more source

Strength of Concrete Subjected to Pullout Load

Journal of Materials in Civil Engineering, 2003
In the present paper, the theoretical results obtained in a punching theory for concrete slabs are applied to the case of pullout failure. In order to explain the difference between the experimental loads and those predicted by the said theory a process of hardening in tension of concrete is hypothesized as being due to the small size of the reaction ...
openaire   +1 more source

Pullout Performance of Geogrids with Different Junction Strength

GeoCongress 2012, 2012
As part of an on-going study at the University of Oklahoma, the influence of geogrids junction strength on their in-aggregate performance was examined using pullout tests. One objective of the study was to determine to what extent the junction strength is a governing factor in the serviceability and stability of reinforced aggregate bases.
T. Mahmood, K. Hatami, R. Ghabchi, M. M. Zaman   +3 more
openaire   +1 more source

On the Pullout Strength of Human Nasal Hair (Vibrissae)

SSRN Electronic Journal, 2020
This study investigates nasal vibrissae-to-dermis detachment in humans, quantifying the pullout force required in adult males. While many studies have investigated the behavior and function of mammalian vibrissae, little is known concerning the mechanical properties of human nasal vibrissae or the strength of the vibrissae-to-dermis attachment ...
Prinz, G.S., Murray, C.D.
openaire   +1 more source

Influence of Matrix Strength on the Pullout Behavior of High Strength Steel Fibers

2021
This study investigates the effects of matrix strength on the pullout behavior of steel fibers by performing single pullout test. Two types of high strength steel fibers, smooth and twisted fiber, were embedded in three different concrete matrices with compressive strengths of 28 MPa (normal concrete), 84 MPa (high-strength concrete), and 180 MPa ...
Ngoc-Thanh Tran, Diu-Huong Nguyen
openaire   +1 more source

Determination of concrete compressive strength with pullout tests

Structural Concrete, 2009
A pullout test using post-installed inserts has been examined as an alternative to drilled cores to determine the in-place concrete compressive strength. Tests have been carried out on eight railway bridges from 1965 to 1980 and on a one year old concrete slab. An empirical strength relationship is proposed between the compressive strength of a drilled
Håkan Thun, Ulf Ohlsson, Lennart Elfgren   +2 more
openaire   +1 more source