Seismic Analyses of Pine Flat Dam: Simplified Use of Viscous Spring Boundaries and Anisotropic Damage in the Principal Directions with the Ability of Cracks Re-Closure

2020 ◽  
pp. 253-261
Author(s):  
E. Robbe ◽  
E. Grimal ◽  
G. Devesa
Keyword(s):  
Anisotropic Damage ◽  
Principal Directions

Anisotropic Damage for Aluminium

2002 ◽  
Vol 5 (2-3-4) ◽  
pp. 269-285 ◽  
Author(s):  
Patrick Croix ◽  
Franck Lauro ◽  
Jérôme Oudin
Keyword(s):  
Anisotropic Damage

scholarly journals Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1537
Author(s):  
Luděk Hynčík ◽  
Petra Kochová ◽  
Jan Špička ◽  
Tomasz Bońkowski ◽  
Robert Cimrman ◽  
...  
Keyword(s):  
Strain Rate ◽  
Material Model ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Stress Strain ◽  
Rate Dependent ◽  
Constitutive Material Model ◽  
Principal Directions ◽  
Constitutive Material

Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging materials seem to be promising due to their low weight, structure, and production price. Based on the review, the linear low-density polyethylene (LLDPE) material was identified as the most promising material for absorbing impact energy. The current paper addresses the identification of the material parameters and the development of a constitutive material model to be used in future designs by virtual prototyping. The paper deals with the experimental measurement of the stress-strain relations of linear low-density polyethylene under static and dynamic loading. The quasi-static measurement was realized in two perpendicular principal directions and was supplemented by a test measurement in the 45° direction, i.e., exactly between the principal directions. The quasi-static stress-strain curves were analyzed as an initial step for dynamic strain rate-dependent material behavior. The dynamic response was tested in a drop tower using a spherical impactor hitting a flat material multi-layered specimen at two different energy levels. The strain rate-dependent material model was identified by optimizing the static material response obtained in the dynamic experiments. The material model was validated by the virtual reconstruction of the experiments and by comparing the numerical results to the experimental ones.

A constitutive model for anisotropic damage in fiber-composites

1995 ◽  
Vol 20 (2) ◽  
pp. 125-152 ◽  
Author(s):  
A. Matzenmiller ◽  
J. Lubliner ◽  
R.L. Taylor
Keyword(s):  
Constitutive Model ◽  
Fiber Composites ◽  
Anisotropic Damage

Influence of anisotropic damage on ultimate load of plane strain problems for foundation

2003 ◽  
Vol 30 (1) ◽  
pp. 41-60
Author(s):  
Hong Sun ◽  
Xi Hong Zhao ◽  
Kwang Wei Lo
Keyword(s):  
Plane Strain ◽  
Ultimate Load ◽  
Anisotropic Damage

Stability of Milling Operations With Asymmetric Cutter Dynamics in Rotating Coordinates

2016 ◽  
Vol 138 (8) ◽  
Author(s):  
Alptunc Comak ◽  
Orkun Ozsahin ◽  
Yusuf Altintas
Keyword(s):  
Time Domain ◽  
Machine Tools ◽  
High Speed ◽  
End Mill ◽  
Spindle Shaft ◽  
Milling Operations ◽  
Stability Model ◽  
Principal Directions ◽  
The Stability ◽  
Rotating Coordinates

High-speed machine tools have parts with both stationary and rotating dynamics. While spindle housing, column, and table have stationary dynamics, rotating parts may have both symmetric (i.e., spindle shaft and tool holder) and asymmetric dynamics (i.e., two-fluted end mill) due to uneven geometry in two principal directions. This paper presents a stability model of dynamic milling operations with combined stationary and rotating dynamics. The stationary modes are superposed to two orthogonal directions in rotating frame by considering the time- and speed-dependent, periodic dynamic milling system. The stability of the system is solved in both frequency and semidiscrete time domain. It is shown that the stability pockets differ significantly when the rotating dynamics of the asymmetric tools are considered. The proposed stability model has been experimentally validated in high-speed milling of an aluminum alloy with a two-fluted, asymmetric helical end mill.

Modelling of induced anisotropic damage in granites

1999 ◽  
Vol 36 (8) ◽  
pp. 1001-1012 ◽  
Author(s):  
J.F. Shao ◽  
D. Hoxha ◽  
M. Bart ◽  
F. Homand ◽  
G. Duveau ◽  
...  
Keyword(s):  
Anisotropic Damage

Anisotropic damage behavior of SiC/SiC composite tubes: Multiaxial testing and damage characterization

2015 ◽  
Vol 76 ◽  
pp. 281-288 ◽  
Author(s):  
Fabien Bernachy-Barbe ◽  
Lionel Gélébart ◽  
Michel Bornert ◽  
Jérôme Crépin ◽  
Cédric Sauder
Keyword(s):  
Anisotropic Damage ◽  
Composite Tubes ◽  
Damage Behavior ◽  
Multiaxial Testing ◽  
Damage Characterization
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