نتایج جستجو برای: pullout resistance

تعداد نتایج: 375882  

2014
Lianxin Gao Jiaoqi Shi

Pullout failure is one of the primary failure modes of API round thread casing connections. Make-up torque and thread tolerances are the two most important factors that can affect the pullout strength. In this paper, the pull-out failure process and mechanism are studied using the finite element analysis (FEA) method. In addition, the effects of make-up torque and thread tolerances on the pullo...

2016
Fuxin Wei Zhiyu Zhou Le Wang Shaoyu Liu Rui Zhong Xizhe Liu Shangbin Cui Ximin Pan Manman Gao Yajing Zhao

BACKGROUND Monsegmental pedicle instrumentation (MSPI) has been used to treat thoracolumbar fractures. However, there are few reports about the biomechanical characteristics of MSPI compared with traditional short-segment pedicle instrumentation (SSPI) in management of unstable thoracolumbar fractures, and the influence of vertebral fracture on screw stability is still unclear. METHODS This s...

2009
K. Kimi Bose A. Krishnan

A large scale experimental program using vertical and batter model piles in sand subjected to pull out loads has been carried out in a model tank of size 1m x 1m x 1m. Mild steel pipes of varying diameters, lengths, and shapes are used as model piles. A poorly graded river sand having specific gravity G= 2.67, Uniformity coefficient= 3.53, emax = 0.81, emin = 0.54 has been used as foundation me...

Journal: :LHI Journal of Land, Housing, and Urban Affairs 2016

2015
Suk-Hyung Kang Yong Jun Cho Young-Baeg Kim Seung Won Park

OBJECTIVE Pedicle screw fixation for spine arthrodesis is a useful procedure for the treatment of spinal disorders. However, instrument failure often occurs, and pedicle screw loosening is the initial step of a range of complications. The authors recently used a modified transpedicular polymethylmethacrylate (PMMA) screw augmentation technique to overcome pedicle screw loosening. Here, they rep...

Journal: :The Journal of bone and joint surgery. British volume 2011
F O'Neill F Condon T McGloughlin B Lenehan J C Coffey M Walsh

We biomechanically investigated whether the standard dynamic hip screw (DHS) or the DHS blade achieves better fixation in bone with regard to resistance to pushout, pullout and torsional stability. The experiments were undertaken in an artificial bone substrate in the form of polyurethane foam blocks with predefined mechanical properties. Pushout tests were also repeated in cadaveric femoral he...

Journal: :FASEB journal : official publication of the Federation of American Societies for Experimental Biology 2002
Helene M Langevin David L Churchill Junru Wu Gary J Badger Jason A Yandow James R Fox Martin H Krag

Acupuncture needle manipulation gives rise to "needle grasp," a biomechanical phenomenon characterized by an increase in the force necessary to pull the needle out of the tissue (pullout force). This study investigates the hypothesis that winding of connective tissue, rather than muscle contraction, is the mechanism responsible for needle grasp. We performed 1) measurements of pullout force in ...

2013
Yongyut Amaritsakul Ching-Kong Chao Jinn Lin

Short-segment instrumentation for spine fractures is threatened by relatively high failure rates. Failure of the spinal pedicle screws including breakage and loosening may jeopardize the fixation integrity and lead to treatment failure. Two important design objectives, bending strength and pullout strength, may conflict with each other and warrant a multiobjective optimization study. In the pre...

2016
Hui Zhang Rena C. Yu

It is well known that fibers improve the performance of cementitious composites by acting as bridging ligaments in cracks. Such bridging behavior is often studied through fiber pullout tests. The relation between the pullout force vs. slip end displacement is characteristic of the fiber-matrix interface. However, such a relation varies significantly with the fiber inclination angle. In the curr...

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