نتایج جستجو برای: compressive stress

تعداد نتایج: 458295  

2016
ARMAND A. LUGASSY JOSEPH L. RABINOWITZ

Compressive properties of sperm whale dentin were measured as a function of orientation of incremental lines. With respect to the general incremental lines' direction, three specimen orientations were selected: longitudinal, oblique (45°) radial and transverse radial. The machined cylindrical specimens were compressed in a mechanical testing machine. A load cell provided with the force values d...

2013
Ki Yong Ann Chang-Geun Cho

The present study concerns compressive and flexural constitutive models incorporated into an isoparametric beam finite element scheme for fiber reinforced polymer (FRP) and concrete composites, using their multi-axial constitutive behavior. The constitutive behavior of concrete was treated in triaxial stress states as an orthotropic hypoelasticity-based formulation to determine the confinement ...

2002
CHANDRA S. YERRAMALLI ANTHONY M. WAAS

The shear lag model has been used in conjunction with the 3D elasticity equations to determine the stress state in a fiber/matrix system containing an interface crack. The use of a shear lag model to capture the stress state at the crack tip and the modelling of the region away from the crack tip by the elasticity equations leads to a simple analytical expression which can be used to determine ...

Journal: :Acta biomaterialia 2005
Christian Greiner Scott M Oppenheimer David C Dunand

Near-stoichiometric NiTi with up to 18% closed porosity was produced by expansion at 1200 degrees C of argon-filled pores trapped by powder metallurgy within a NiTi billet. When optimally heat-treated, NiTi with 6-16% porosity exhibits superelasticity, with recoverable compressive strains up to 6% at a maximum compressive stress up to 1700 MPa. The apparent Young's modulus of NiTi with 16% poro...

Journal: :JAMA surgery 2014
Vladimir K Neychev Pierre F Saldinger

The failure of the pancreaticojejunal anastomosis remains an important and potentially lethal postoperative complication after pancreaticoduodenectomy. During the pancreaticojejunostomy, creation of compressive and shear forces during suture placement and knot tying may cause deformation of and cutting through the fragile pancreatic parenchyma. We sought to understand the mechanics of needle-pa...

2002
J. B. Neaton C. - L. Hsueh

The structure, polarization, and zone-center phonons of bulk tetragonal BaTiO 3 under compressive epitaxial stress are calculated using density functional theory within the local density approximation. The polarization, computed using the Berry-phase formalism, increases with increasing tetragonality and is found to be enhanced by nearly 70% for the largest compressive misfit strain considered ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

2016
Rachit Sharma

Tremendous quantities of reservoir deposited sediments are required to be dredged regularly to maintain the storage capacity of the reservoir. The reservoir dredged material (RDM) can be utilized as construction material after admixing with additives such as cement and fly ash thereby improving its strength characteristics. This research paper presents results of laboratory investigation carrie...

Journal: :Physical review letters 2008
Chin-Lung Kuo Sangheon Lee Gyeong S Hwang

We present a prediction for the formation of surface defects in a thin amorphous silica layer during relaxation of externally imposed stresses and strains, based on extensive ab initio molecular dynamics calculations. Our calculations show that the application of a biaxial compressive stress leads to the creation of edge-sharing tetrahedron and/or silanone defects at the silica surface, which t...

Journal: :journal of rehabilitation in civil engineering 2014
ali kheyroddin hosein naderpour masoud ahmadi

this paper presents a new model for predicting the compressive strength of steel-confined concrete on circular concrete filled steel tube (ccfst) stub columns under axial loading condition based on artificial neural networks (anns) by using a large wide of experimental investigations. the input parameters were selected based on past studies such as outer diameter of column, compressive strength...

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