scholarly journals Buckling of geometrically confined shells

Soft Matter ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 1215-1222 ◽  
Author(s):  
Lucia Stein-Montalvo ◽  
Paul Costa ◽  
Matteo Pezzulla ◽  
Douglas P. Holmes
Keyword(s):  
Geometric Parameter ◽  
Thick Shells ◽  
Geometrically Confined

Moderately thick shells constrained in the radial and transverse directions buckle to a wavenumber set by a single geometric parameter.

GEOMETRIC-PARAMETER INFLUENCES ON AND ORTHOGONAL EVALUATION OF THERMOMECHANICAL PERFORMANCES OF A LAMINATED COOLING STRUCTURE

2020 ◽  
Vol 51 (1) ◽  
pp. 57-82
Author(s):  
Chen Wang ◽  
Jing-Zhou Zhang ◽  
Chun-hua Wang ◽  
Jun Ji ◽  
Xiao-Ming Tan
Keyword(s):  
Geometric Parameter

scholarly journals Variation of the Three-Dimensional Femoral J-Curve in the Native Knee

2021 ◽  
Vol 11 (7) ◽  
pp. 592
Author(s):  
Sonja A. G. A. Grothues ◽  
Klaus Radermacher
Keyword(s):  
Geometric Parameter ◽  
Knee Kinematics ◽  
Size Variation ◽  
Principal Component ◽  
Parameter Analysis ◽  
Patient Specific ◽  
3D Analysis ◽  
Relative Location ◽  
Shape Variation ◽  
J Curve

The native femoral J-Curve is known to be a relevant determinant of knee biomechanics. Similarly, after total knee arthroplasty, the J-Curve of the femoral implant component is reported to have a high impact on knee kinematics. The shape of the native femoral J-Curve has previously been analyzed in 2D, however, the knee motion is not planar. In this study, we investigated the J-Curve in 3D by principal component analysis (PCA) and the resulting mean shapes and modes by geometric parameter analysis. Surface models of 90 cadaveric femora were available, 56 male, 32 female and two without respective information. After the translation to a bone-specific coordinate system, relevant contours of the femoral condyles were derived using virtual rotating cutting planes. For each derived contour, an extremum search was performed. The extremum points were used to define the 3D J-Curve of each condyle. Afterwards a PCA and a geometric parameter analysis were performed on the medial and lateral 3D J-Curves. The normalized measures of the mean shapes and the aspects of shape variation of the male and female 3D J-Curves were found to be similar. When considering both female and male J-Curves in a combined analysis, the first mode of the PCA primarily consisted of changes in size, highlighting size differences between female and male femora. Apart from changes in size, variation regarding aspect ratio, arc lengths, orientation, circularity, as well as regarding relative location of the 3D J-Curves was found. The results of this study are in agreement with those of previous 2D analyses on shape and shape variation of the femoral J-Curves. The presented 3D analysis highlights new aspects of shape variability, e.g., regarding curvature and relative location in the transversal plane. Finally, the analysis presented may support the design of (patient-specific) femoral implant components for TKA.

A nonlinear model of thick shells for large-amplitude vibrations

2021 ◽  
Vol 130 ◽  
pp. 103668
Author(s):  
Hamid Reza Moghaddasi ◽  
Mojtaba Azhari ◽  
Mohammad Mehdi Saadatpour ◽  
Saeid Sarrami-Foroushani
Keyword(s):  
Nonlinear Model ◽  
Large Amplitude ◽  
Large Amplitude Vibrations ◽  
Thick Shells

Limit Pressures of Cylindrical and Spherical Shells

2000 ◽  
Vol 123 (3) ◽  
pp. 288-292 ◽  
Author(s):  
Arturs Kalnins ◽  
Dean P. Updike
Keyword(s):  
Geometric Parameter ◽  
Cylindrical Shells ◽  
Length Effect ◽  
Spherical Shells ◽  
Simply Supported ◽  
Limit Pressure ◽  
Section Viii ◽  
Division 2

Tresca limit pressures for long cylindrical shells and complete spherical shells subjected to arbitrary pressure, and several approximations to the exact limit pressures for limited pressure ranges, are derived. The results are compared with those in Section III-Subsection NB and in Section VIII-Division 2 of the ASME B&PV Code. It is found that in Section VIII-Division 2 the formulas agree with the derived limit pressures and their approximations, but that in Section III-Subsection NB the formula for spherical shells is different from the derived approximation to the limit pressure. The length effect on the limit pressure is investigated for cylindrical shells with simply supported ends. A geometric parameter that expresses the length effect is determined. A formula and its limit of validity are derived for an assessment of the length effect on the limit pressures.

Periodic Parallel Array of Nanopillars and Nanoholes Resulting from Colloidal Stripes Patterned by Geometrically Confined Evaporative Self-Assembly for Unique Anisotropic Wetting

2014 ◽  
Vol 6 (22) ◽  
pp. 20300-20308 ◽  
Author(s):  
Xiangmeng Li ◽  
Chunhui Wang ◽  
Jinyou Shao ◽  
Yucheng Ding ◽  
Hongmiao Tian ◽  
...  
Keyword(s):  
Self Assembly ◽  
Parallel Array ◽  
Geometrically Confined

scholarly journals Mobility in geometrically confined membranes

2011 ◽  
Vol 108 (31) ◽  
pp. 12605-12610 ◽  
Author(s):  
Y. A. Domanov ◽  
S. Aimon ◽  
G. E. S. Toombes ◽  
M. Renner ◽  
F. Quemeneur ◽  
...  
Keyword(s):  
Geometrically Confined
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