Chord failure resistance of 3D cut welded connections with CHS columns and through I‐beams

AbstractAdvanced diagnostic instruments and analyses applied to failure surfaces and cross sections of bulk metallic glasses (BMGs) can provide insight into the deformation and failure of these materials and assist in prototyping new materials with improved failure resistance. Confocal- optics scanning laser microscopic analysis of conjugate fracture surface topographs suggests that the formation and stretching of ligaments are likely keys to the high impact toughness of Vitreloy.

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Cellulose Whiskers Micro-Fibers Effect in the Mechanical Proprieties of PP and PLA Composites Fibers Obtained by Spinning Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.146.12 ◽

2011 ◽

Vol 146 ◽

pp. 12-26 ◽

Cited By ~ 3

Author(s):

A. Gherissi ◽

R.Ben Cheikh ◽

E. Dévaux ◽

Fethi Abbassi

Keyword(s):

Mechanical Properties ◽

Young’S Modulus ◽

Volume Fraction ◽

Young's Modulus ◽

Tensile Tests ◽

Advanced Materials ◽

Uniaxial Tensile ◽

Failure Resistance ◽

Cellulose Whiskers ◽

Limit Strength

In this study, we present the manufacturing process of two new composites materials in the form of long fibers of polylactic-acid (PLA) or polypropylene (PP), reinforced by cellulose whiskers micro-fibers loads. In order to evaluate the mechanical properties of these advanced materials, a several uniaxial tensile tests were carried out. The PP and the PLA have initially been spinning without the addition of cellulose whiskers micro-fibers. In order to study the effects of cellulose whiskers micro-fibers reinforcements in the Mechanical behavior of the PLA and PP filaments, we determinate the proprieties of these advanced material from the tensile results. For the PP composite filaments material case, the whiskers reinforcement increases Young's modulus and failure resistance, but it reduces the limit strength failure. For the PLA composites the addition of 1% wt of cellulose whiskers from the total volume fraction of the material, increase the Young’s modulus more than 50% and a decrease of the failure resistance and the limit strength of composite. The obtained composites fibers are very rigid and brittle. What follows, that the addition of cellulose whiskers micro fibers in PP matrix, provides mechanical properties more convenient compared to the PLA matrix.

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Chord failure resistance of 3D cut welded connections with CHS columns and through I-BEAMS

Thin-Walled Structures ◽

10.1016/j.tws.2020.106821 ◽

2020 ◽

Vol 154 ◽

pp. 106821 ◽

Cited By ~ 3

Author(s):

S. Di Benedetto ◽

M. Latour ◽

G. Rizzano

Keyword(s):

Failure Resistance

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Premolar Axial Wall Height Effect on CAD/CAM Crown Retention

Operative Dentistry ◽

10.2341/16-086-l ◽

2016 ◽

Vol 41 (6) ◽

pp. 666-671 ◽

Cited By ~ 1

Author(s):

C Gillette ◽

R Buck ◽

N DuVall ◽

S Cushen ◽

M Wajdowicz ◽

...

Keyword(s):

Computer Aided Design ◽

Lithium Disilicate ◽

Resin Cement ◽

Failure Resistance ◽

All Ceramic ◽

Computer Aided ◽

Cad Cam ◽

Ceramic Crowns ◽

Aided Design ◽

Post Hoc

SUMMARY Objective: To evaluate the significance of reduced axial wall height on retention of adhesively luted, all-ceramic, lithium disilicate premolar computer-aided design/computer-aided manufacturing (CAD/CAM) crowns based on preparations with a near ideal total occlusal convergence of 10°. Methods: Forty-eight recently extracted premolars were randomly divided into four groups (n=12). Each group received all-ceramic CAD/CAM crown preparations featuring axial wall heights of 0, 1, 2, and 3 mm, respectively, all with a 10° total occlusal convergence. Scanned preparations were fitted with lithium disilicate all-ceramic crowns that were luted with a self-etching resin cement. Specimens were tested to failure at a 45° angle to the tooth long axis with failure load converted to megapascals (MPa) based on the measured bonding surface area. Mean data were analyzed using analysis of variance/Tukey's post hoc test (α=0.05). Results: Lithium disilicate crowns adhesively luted on preparations with 0 axial wall height demonstrated significantly less failure resistance compared with the crowns luted on preparations with axial wall heights of 1 to 3 mm. There was no failure stress difference between preparations with 1 to 3 mm axial wall height. Conclusions: Under conditions of this study, adhesively luted lithium disilicate bicuspid crowns with a total occlusal convergence of 10° demonstrated similar failure resistance independent of axial wall height of 1 to 3 mm. This study provides some evidence that adhesion combined with an ideal total occlusal convergence may compensate for reduced axial wall height.

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