scholarly journals A porous fibrous hyperelastic damage model for human periodontal ligament: Application of a microcomputerized tomography finite element model

2019 ◽  
Vol 35 (4) ◽  
pp. e3176 ◽  
Author(s):  
Javier Ortún‐Terrazas ◽  
José Cegoñino ◽  
Urbano Santana‐Penín ◽  
Urbano Santana‐Mora ◽  
Amaya Pérez del Palomar
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Periodontal Ligament ◽  
Damage Model ◽  
Element Model

Effects of material property variation in composite panels

2017 ◽  
Vol 89 (2) ◽  
pp. 274-279
Author(s):  
Thomas Wright ◽  
Imran Hyder ◽  
Mitchell Daniels ◽  
David Kim ◽  
John P. Parmigiani
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Material Property ◽  
Material Properties ◽  
Damage Model ◽  
Element Model ◽  
Maximum Load ◽  
Content Type ◽  
Property Variation ◽  
Load Carrying

Purpose The purpose of this paper is to determine which of the ten material properties of the Hashin progressive damage model significantly affect the maximum load-carrying ability of center-notched carbon fiber panels under in-plane tension and out-of-plane bending. Design/methodology/approach The approach used is to calculate the maximum load using a finite element model for a range of material property values as specified by a fraction factorial design. The finite element model used has been experimentally validated in prior work. Findings Results showed that for the laminates considered, at most three and as few as one of the ten Hashin material properties significantly affected the magnitude of the maximum load. Practical implications While the results of this paper only specifically apply to the laminates included in the study, the results suggest that, in general, only a small number of the Hashin material properties affect laminate load-carrying ability. Originality/value Knowing which properties are significant is of value in selecting materials to optimize performance and also in determining which properties need to be known to a high accuracy.

Evidence of Ductile Tearing Ahead of the Cutting Tool and Modeling the Energy Consumed in Material Separation in Micro-Cutting

2006 ◽  
Vol 129 (2) ◽  
pp. 321-331 ◽  
Author(s):  
Sathyan Subbiah ◽  
Shreyes N. Melkote
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Damage Model ◽  
Chip Thickness ◽  
Element Model ◽  
Uncut Chip Thickness ◽  
Micro Cutting ◽  
Ductile Tearing ◽  
Material Separation ◽  
Cutting Experiments

Orthogonal cutting experiments using a quick-stop device are performed on Al2024-T3 and OFHC copper to study the chip–workpiece interface in a scanning electron microscope. Evidence of ductile tearing ahead of the tool at cutting speeds of 150m∕min has been found. A numerical finite element model is then developed to study the energy consumed in material separation in micro-cutting. The ductile fracture of Al2024-T3 in a complex stress state ahead of the tool is captured using a damage model. Chip formation is simulated via the use of a sacrificial layer and sequential elemental deletion in this layer. Element deletion is enforced when the accumulated damage exceeds a predetermined value. A Johnson–Cook damage model that is load history dependent and with strain-to-fracture dependent on stress, strain rate, and temperature is used to model the damage. The finite element model is validated using the cutting forces obtained from orthogonal micro-cutting experiments. Simulations are performed over a range of uncut chip thickness values. It is found that at lower uncut chip thickness values, the percentage of energy expended in material separation is higher than at higher uncut chip thicknesses. This work highlights the importance of the energy associated with material separation in the nonlinear scaling effect of specific cutting energy in micro-cutting.

Virtual characterization of nonlocal continuum damage model parameters using a high fidelity finite element model

2021 ◽  
Vol 256 ◽  
pp. 113073
Author(s):  
Johannes Reiner ◽  
Xiaodong Xu ◽  
Navid Zobeiry ◽  
Reza Vaziri ◽  
Stephen R. Hallett ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Damage Model ◽  
Element Model ◽  
Model Parameters ◽  
High Fidelity ◽  
Continuum Damage ◽  
Nonlocal Continuum ◽  
Continuum Damage Model

Non-Local Damage Model to Predict the Effect of Pre-Strain on Ductile Fracture in Aluminum Alloy 5052

2012 ◽  
Author(s):  
Yaser Alinaghian ◽  
Mahyar Asadi ◽  
Arnaud Weck
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Ductile Fracture ◽  
Damage Model ◽  
Element Model ◽  
Local Damage ◽  
Micron Size ◽  
Non Local ◽  
The Finite Element Model

Metallic components may develop plastic deformation before in-service loading (pre-strain) due to manufacturing process and/or unexpected loading. This pre-strain not only affects the yield strength of the material but also influences its fracture properties. The work presented here employed laser drilled model materials to better understand the effect of pre-strain on ductile fracture in aluminum alloy 5052. The micron-size laser drilled holes mimic voids forming during ductile fracture. These laser holes are introduced after the material has been pulled in tension to various amounts of pre-strain. The effect of pre-strain on void growth and linkage leading to fracture is studied. A non-local damage is used in a finite element model to predict linkage between voids. This non-local damage has only two adjustable parameters, namely the local failure strain in uniaxial tension and the characteristic length L which intervenes in the non-local averaging scheme. The precise arrangement of the laser holes can be exactly reproduced in the finite element model which allows the model to be validated with the experimental results.

Time-dependent mechanical behaviour of the periodontal ligament

2000 ◽  
Vol 214 (5) ◽  
pp. 497-504 ◽  
Author(s):  
W D van Driel ◽  
E J van Leeuwen ◽  
J W Von den Hoff ◽  
J C Maltha ◽  
A M Kuijpers-Jagtman
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Mechanical Behaviour ◽  
Periodontal Ligament ◽  
Alveolar Bone ◽  
Element Model ◽  
Time Dependent ◽  
Step Response ◽  
In Vivo Experiments

The process of tooth displacement in response to orthodontic forces is thought to be induced by the stresses and strains in the periodontium. The mechanical force on the tooth is transmitted to the alveolar bone through a layer of soft connective tissue, the periodontal ligament. Stress and/or strain distribution in this layer must be derived from mathematical models, such as the finite element method, because it cannot be measured directly in a non-destructive way. The material behaviour of the constituent tissues is required as an input for such a model. The purpose of this study was to determine the time-dependent mechanical behaviour of the periodontal ligament due to orthodontic loading of a tooth. Therefore, in vivo experiments were performed on beagle dogs. The experimental configuration was simulated in a finite element model to estimate the poroelastic material properties for the periodontal ligament. The experiments showed a two-step response: an instantaneous displacement of 14.10 ± 3.21 μm within 4 s and a more gradual (creep) displacement reaching a maximum of 60.00 ± 9.92 μm after 5 h. This response fitted excellently in the finite element model when 21 per cent of the ligament volume was assigned a permeability of 1.0 × 10−14m4/Ns, the remaining 97 per cent was assigned a permeability of 2.5 × 10−17 m4/N s. A tissue elastic modulus of 0.015 ± 0.001 MPa was estimated. Our results indicate that fluid compartments within the periodontal ligament play an important role in the transmission and damping of forces acting on teeth.

Hydro-mechanical coupling in the periodontal ligament: A porohyperelastic finite element model

2011 ◽  
Vol 44 (1) ◽  
pp. 34-38 ◽  
Author(s):  
Marzio Bergomi ◽  
Joël Cugnoni ◽  
Matteo Galli ◽  
John Botsis ◽  
Urs C. Belser ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Periodontal Ligament ◽  
Element Model ◽  
Mechanical Coupling
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