scholarly journals Experimental and finite element modeling of partial infill patterns for thermoplastic polymer extrusion 3D printed material using elasto-plastic method

2020 ◽  
Author(s):  
Mohd Sabri Hussin ◽  
Sanusi Hamat ◽  
Syamir Alihan Showkat Ali ◽  
Muhammad Aiman Ahmad Fozi ◽  
Yuzairi Abd Rahim ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Thermoplastic Polymer ◽  
Polymer Extrusion ◽  
Element Modeling ◽  
3D Printed ◽  
Partial Infill

scholarly journals Finite Element Modeling in the Design Process of 3D Printed Pneumatic Soft Actuators and Sensors

Robotics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 52 ◽  
Author(s):  
Charbel Tawk ◽  
Gursel Alici
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Design Process ◽  
Three Dimensional ◽  
Nonlinear Behavior ◽  
Robotic Systems ◽  
Element Modeling ◽  
And Topology ◽  
3D Printed ◽  
Soft Actuators

The modeling of soft structures, actuators, and sensors is challenging, primarily due to the high nonlinearities involved in such soft robotic systems. Finite element modeling (FEM) is an effective technique to represent soft and deformable robotic systems containing geometric nonlinearities due to large mechanical deformations, material nonlinearities due to the inherent nonlinear behavior of the materials (i.e., stress-strain behavior) involved in such systems, and contact nonlinearities due to the surfaces that come into contact upon deformation. Prior to the fabrication of such soft robotic systems, FEM can be used to predict their behavior efficiently and accurately under various inputs and optimize their performance and topology to meet certain design and performance requirements. In this article, we present the implementation of FEM in the design process of directly three-dimensional (3D) printed pneumatic soft actuators and sensors to accurately predict their behavior and optimize their performance and topology. We present numerical and experimental results to show that this approach is very effective to rapidly and efficiently design the soft actuators and sensors to meet certain design requirements and to save time, modeling, design, and fabrication resources.

scholarly journals Bioinspired material architectures from bighorn sheep horncore velar bone for impact loading applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Trevor G. Aguirre ◽  
Luca Fuller ◽  
Aniket Ingrole ◽  
Tim W. Seek ◽  
Benjamin B. Wheatley ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Impact Force ◽  
Rocky Mountain ◽  
Ethylene Vinyl Acetate ◽  
Bighorn Sheep ◽  
High Energy ◽  
Ovis Canadensis ◽  
Element Modeling ◽  
3D Printed

Abstract Rocky Mountain bighorn sheep rams (Ovis canadensis canadensis) routinely conduct intraspecific combat where high energy cranial impacts are experienced. Previous studies have estimated cranial impact forces to be up to 3400 N during ramming, and prior finite element modeling studies showed the bony horncore stores 3 × more strain energy than the horn during impact. In the current study, the architecture of the porous bone within the horncore was quantified, mimicked, analyzed by finite element modeling, fabricated via additive manufacturing, and mechanically tested to determine the suitability of the novel bioinspired material architecture for use in running shoe midsoles. The iterative biomimicking design approach was able to tailor the mechanical behavior of the porous bone mimics. The approach produced 3D printed mimics that performed similarly to ethylene–vinyl acetate shoe materials in quasi-static loading. Furthermore, a quadratic relationship was discovered between impact force and stiffness in the porous bone mimics, which indicates a range of stiffness values that prevents impact force from becoming excessively high. These findings have implications for the design of novel bioinspired material architectures for minimizing impact force.

Exact First Order Finite Element Modeling for Eddy Current NDE

1991 ◽  
Vol 3 (1) ◽  
pp. 235-253 ◽  
Author(s):  
L. D. Philipp ◽  
Q. H. Nguyen ◽  
D. D. Derkacht ◽  
D. J. Lynch ◽  
A. Mahmood
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Eddy Current ◽  
Element Modeling ◽  
First Order ◽  
Eddy Current Nde
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