Simulation of Hyper-Elasticity by Shape Estimation

2021 ◽  
pp. 1-11
Author(s):  
Christopher-Denny Matte ◽  
Tsz Ho Kwok
Keyword(s):  
Additive Manufacturing ◽  
Raw Material ◽  
Shape Estimation ◽  
Linear Deformation ◽  
Shape Factors ◽  
Hyperelastic Materials ◽  
Novel Approach ◽  
Non Linear ◽  
Linear Material ◽  
Manufacturing Techniques

Abstract The simulation of complex geometries and non-linear deformation has been a challenge for standard simulation methods. There has traditionally been a trade-off between performance and accuracy. With the popularity of additive manufacturing and the new design space it enables, the challenges are even more prevalent. Additionally, multiple additive manufacturing techniques now allow hyperelastic materials as raw material for fabrication and multi-material capabilities. This allows designers more freedom but also introduces new challenges for control and simulation of the printed parts. In this paper, a novel approach to implementing non-linear material capabilities is devised with negligible additional computations for geometry-based methods. Material curves are fitted with a polynomial expression, which can determine the tangent modulus, or stiffness, of a material based on strain energy. The moduli of all elements are compared to determine relative shape factors used to establish an element's blended shape. This process is done dynamically to update a material's stiffness in real-time, for any number of materials, regardless of linear or non-linear material curves.

Simulation of Hyper-Elasticity by Shape Estimation

2020 ◽  
Author(s):  
Christopher-Denny Matte ◽  
Tsz-Ho Kwok
Keyword(s):  
Additive Manufacturing ◽  
Raw Material ◽  
Shape Estimation ◽  
Linear Deformation ◽  
Shape Factors ◽  
Hyperelastic Materials ◽  
Novel Approach ◽  
Non Linear ◽  
Linear Material ◽  
Manufacturing Techniques

Abstract The simulation of complex geometries and non linear deformation has been a challenge for standard simulation methods. There has traditionally been a trade off between performance and accuracy. With the popularity of additive manufacturing and the new design space it enables, the challenges are even more prevalent. Additionally multiple additive manufacturing techniques now enable the use of hyperelastic materials as raw material for fabrication, and multi-material capabilities. This allows designers more freedom, but also introduces new challenges for control and simulation of the printed parts. In this paper, a novel approach to implementing non-linear material capabilities is devised with negligible additional computational for geometry based approaches. Material curves are fitted with a polynomial expression which can determine the tangent modulus, or stiffness, of a material based on strain energy. The moduli of all elements are compared to determine relative shape factors used to establish the blended shape of an element. This process is done dynamically to update the stiffness of a material in real-time, for any number of materials, regardless of linear or non-linear material curves.

Non-Linear Analysis of Bio-Structures Through Refined Beam Models

2018 ◽  
Author(s):  
Daniele Guarnera ◽  
Erasmo Carrera ◽  
Ibrahim Kaleel ◽  
Alfonso Pagani ◽  
Marco Petrolo
Keyword(s):  
Complex Geometry ◽  
Local Effect ◽  
The Finite Element Method ◽  
Nonlinear Analyses ◽  
Linear Behavior ◽  
Novel Approach ◽  
Non Linear ◽  
Out Of Plane ◽  
Carrera Unified Formulation ◽  
Linear Material

A novel approach for the analysis of the non-linear behavior of bio-structures is presented here. This method is developed in the framework of the Carrera Unified Formulation (CUF), a higher-order 1D theory according to which the kinematics of the problem depends on the arbitrary expansion of the generalized unknowns. Taylor-like (TE) and Lagrange-like expansion functions (LE) are employed to describe the kinematic field along the cross-section and, the finite element method (FEM) is used to formulate the governing equations. In this work, the effects of material nonlinearities are investigated and, the problem is solved by using the Newton-Raphson method. An atherosclerotic plaque of an artery is introduced as a typical bio-structure with complex geometry and studied for both linear and non-linear material cases. The results from the proposed technique highlight the accuracy of the in-plane and out-of-plane stress/strain distributions for different 1D models. The 3D-like accuracy of local effect predictions, the possibility of dealing with complex geometries, and low computational costs of nonlinear analyses make the present formulation appealing for biomechanical applications.

scholarly journals Individual layer fabrication (ILF): a novel approach to additive manufacturing by the use of wood

2021 ◽  
Author(s):  
Klaudius Henke ◽  
Daniel Talke ◽  
Frauke Bunzel ◽  
Birger Buschmann ◽  
Carsten Asshoff
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Thin Layer ◽  
Mechanical Pressure ◽  
Individual Layer ◽  
Selective Binding ◽  
Laminated Object Manufacturing ◽  
Novel Approach ◽  
Manufacturing Techniques ◽  
The Individual

AbstractA novel process named ‘individual layer fabrication (ILF)’ is presented, in which objects are built up by laminating individually contoured wood-based panels. However, contrary to the well-known process of ‘laminated object manufacturing (LOM)’, in ILF, the individual panels are not shaped by a subtractive process but additively by selective binding of wooden particles. The particles are spread as a thin layer onto a built platform. A liquid adhesive is then applied only to those areas where the contoured panel is to be generated. As each layer is fabricated individually, the ILF process allows the application of mechanical pressure. Thereby, compared to other additive manufacturing techniques, the necessary amount of binder can be significantly reduced and mechanical properties comparable to particle boards can be achieved.

Development of Novel Hybrid Manufacturing Technique for Manufacturing Support Structures Free Complex Parts

2019 ◽  
Author(s):  
Haris Ali Khan ◽  
Toyosi Ademujimi
Keyword(s):  
Additive Manufacturing ◽  
Support Structures ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Novel Approach ◽  
Subtractive Manufacturing ◽  
Need For Support ◽  
Near Net Shape ◽  
Manufacturing Techniques ◽  
Complex Parts

Abstract This study unearths a novel approach utilizing conventional subtractive manufacturing technology (5-axis CNC milling center) to realize additively manufactured complex geometries without employing support structures. The proposed approach was based on benefiting from the precision and accuracy of subtractive manufacturing while leveraging the freedom of design of additive manufacturing (AM) process. The desired objectives were achieved in a three-stepped methodology where initially the CNC machine was modified to adapt the 3D printing protocols while in the second step, additional hardware was retrofitted on the conventional CNC machine making it compatible to print 3D parts. A “geometric subsection” approach was adopted as the third step where the desired printed part was divided in different subsections based on the overhang angles and the rotational axes of the CNC machine was then utilized in a manner to eliminate the need for support structures. The manufactured AM part can then be post-processed employing the same machining platform. The proposed approach thereby also served as a next step in evolution of done-in-one processes by printing near-net shape components through additive manufacturing and then promptly acquiring the net shape through subtractive manufacturing techniques.

scholarly journals Design and manufacturing of shin pads with multi-material additive manufactured features for football players: A comparison with commercial shin pads

2018 ◽  
Vol 233 (1) ◽  
pp. 160-169 ◽  
Author(s):  
Aitor Cazón-Martín ◽  
Macarena Iturrizaga-Campelo ◽  
Luis Matey-Muñoz ◽  
María Isabel Rodríguez-Ferradas ◽  
Paz Morer-Camo ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Football Players ◽  
Novel Approach ◽  
Transmitted Force ◽  
Design And Manufacturing ◽  
Impact Acceleration ◽  
Manufacturing Techniques ◽  
Traditional Manufacturing ◽  
Design And Manufacture ◽  
The Impact

Shin pads are part of the mandatory equipment footballers must wear so as to prevent lesions. Most players wear commercially available shin pads made from a variety of common materials (polypropylene or polyethylene) and high-resistance materials (glass fibre, carbon fibre or Kevlar) using traditional manufacturing techniques. Additive manufacturing was used years ago to deliver customised rigid shin pads, but they did not offer any significant advantage in terms of materials or design compared to traditional shin pads. This project analyses a novel approach to the design and manufacture of shin pads for football players that combines existing digitisation tools, lattice structures and a multi-material additive manufacturing device. A total of 24 different additive manufacturing geometries were evaluated using a customised rig where a 1-kg impactor was released from several heights (100–400 mm). The impact acceleration, the transmitted force to the leg and penetration were calculated. Results were compared against two commercially available shin pads. Results show that two of the additive manufacturing specimens tested at the highest drop height had lower impact accelerations than commercial shin pads. They had an acceleration reduction between 42% and 68% with respect to the commercial shin pads. Regarding the penetration, the improvement achieved with additive manufacturing specimens ranged from 13% to 32%, while the attenuation and the contact times were similar.

scholarly journals A Review on Additive Manufacturing Possibilities for Electrical Machines

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1940
Author(s):  
Muhammad Usman Naseer ◽  
Ants Kallaste ◽  
Bilal Asad ◽  
Toomas Vaimann ◽  
Anton Rassõlkin
Keyword(s):  
Additive Manufacturing ◽  
Large Scale ◽  
Three Dimensional ◽  
Electrical Machines ◽  
Electromagnetic Properties ◽  
Scale Production ◽  
Performance Parameters ◽  
Large Scale Production ◽  
One Step ◽  
Manufacturing Techniques

This paper presents current research trends and prospects of utilizing additive manufacturing (AM) techniques to manufacture electrical machines. Modern-day machine applications require extraordinary performance parameters such as high power-density, integrated functionalities, improved thermal, mechanical & electromagnetic properties. AM offers a higher degree of design flexibility to achieve these performance parameters, which is impossible to realize through conventional manufacturing techniques. AM has a lot to offer in every aspect of machine fabrication, such that from size/weight reduction to the realization of complex geometric designs. However, some practical limitations of existing AM techniques restrict their utilization in large scale production industry. The introduction of three-dimensional asymmetry in machine design is an aspect that can be exploited most with the prevalent level of research in AM. In order to take one step further towards the enablement of large-scale production of AM-built electrical machines, this paper also discusses some machine types which can best utilize existing developments in the field of AM.

scholarly journals Development of a 3D Printable and Highly Stretchable Ternary Organic-Inorganic Nanocomposite Hydrogel

2021 ◽  
Author(s):  
Chen Hu ◽  
Malik Haider ◽  
Lukas Hahn ◽  
Mengshi Yang ◽  
Robert Luxenhofer
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Nanocomposite Hydrogel ◽  
Highly Stretchable ◽  
Manufacturing Techniques ◽  
Advanced Applications

Hydrogels that can be processed with additive manufacturing techniques and concomitantly possess favorable mechanical properties are interesting for many advanced applications. However, the development of novel ink materials with high...

scholarly journals Towards a contemporary player learning in development framework for sports practitioners

2021 ◽  
pp. 174795412110023
Author(s):  
Mark O Sullivan ◽  
Carl T Woods ◽  
James Vaughan ◽  
Keith Davids
Keyword(s):  
Linear Process ◽  
Task Environment ◽  
Coach Education ◽  
Development Framework ◽  
Novel Approach ◽  
Non Linear ◽  
And Performance ◽  
Learning Development ◽  
High Level ◽  
User Friendly

As it is appreciated that learning is a non-linear process – implying that coaching methodologies in sport should be accommodative – it is reasonable to suggest that player development pathways should also account for this non-linearity. A constraints-led approach (CLA), predicated on the theory of ecological dynamics, has been suggested as a viable framework for capturing the non-linearity of learning, development and performance in sport. The CLA articulates how skills emerge through the interaction of different constraints (task-environment-performer). However, despite its well-established theoretical roots, there are challenges to implementing it in practice. Accordingly, to help practitioners navigate such challenges, this paper proposes a user-friendly framework that demonstrates the benefits of a CLA. Specifically, to conceptualize the non-linear and individualized nature of learning, and how it can inform player development, we apply Adolph’s notion of learning IN development to explain the fundamental ideas of a CLA. We then exemplify a learning IN development framework, based on a CLA, brought to life in a high-level youth football organization. We contend that this framework can provide a novel approach for presenting the key ideas of a CLA and its powerful pedagogic concepts to practitioners at all levels, informing coach education programs, player development frameworks and learning environment designs in sport.

Sign in / Sign up

Export Citation Format

Share Document