The torsion test offers a new approach for evaluating CAD/CAM material bonding

2021 ◽  
pp. 1-18
Author(s):  
Farid S. El-Askary ◽  
Satoshi Yamaguchi ◽  
Atsushi Mine ◽  
Ranna Kitagawa ◽  
Nanako Hirose ◽  
...  
Keyword(s):  
Torsion Test ◽  
New Approach ◽  
Cad Cam

A New Approach to Determining Optimum Tool Size for Finish Milling of NURBS Profiles

2006 ◽  
Author(s):  
Hongda Zhang ◽  
Zezhong C. Chen
Keyword(s):  
Manufacturing Industry ◽  
Cutting Tool ◽  
Software Systems ◽  
New Approach ◽  
Mechanical Parts ◽  
Finish Machining ◽  
Cad Cam ◽  
Complicated Geometries ◽  
Global And Local ◽  
Cam Software

A curve model of non-uniform rational B-spline (NURBS) has been widely adopted in mainstream CAD/CAM software systems to design complicated geometries of mechanical parts, for example, the curved profiles of pockets, sides, and islands. To accurately produce these geometries in finish milling, the size of the cutting tool should be optimized in order to attain high machining efficiency. Although this has been a research focus for a decade, optimal tool size determination still remains as a technical challenge. This work proposes a new approach to addressing this challenge so that the cutting tool of the largest allowable size is selected for finish machining without global and local gouge on the part. In this approach, a global optimization problem is formulated for the optimum tool size, and particle swarm optimization (PSO) method is employed to solve this problem. As a result, this approach can efficiently optimize the tool size for finish machining of the NURBS profiles; on the other hand, it can be more accurately and efficiently to detect global and local gouge on the profiles. Since it is easy to implement, this approach can be directly used in the manufacturing industry.

A New Approach to the Torsion Test for Determining Flow Curves

CIRP Annals ◽  
1989 ◽  
Vol 38 (1) ◽  
pp. 223-226 ◽  
Author(s):  
A. Gräber ◽  
K. Pöhlandt ◽  
K. Lange
Keyword(s):  
Torsion Test ◽  
Flow Curves ◽  
New Approach

scholarly journals A New Approach to Evaluate Fracture Toughness of Structural Materials

2003 ◽  
Author(s):  
J. A. Wang ◽  
K. C. Liu
Keyword(s):  
Fracture Toughness ◽  
Three Dimensional ◽  
Torsion Test ◽  
Computer Code ◽  
Structural Materials ◽  
New Approach ◽  
Dimensional Finite Element ◽  
Toughness Testing ◽  
Materials Used ◽  
Three Dimensional Finite Element

A new method, designated as Spiral Notch Torsion Test (SNTT), is developed recently to measure the intrinsic fracture toughness (KIC) of structural materials. The SNTT overcomes many of the limitations inherent in traditional techniques and makes it possible to standardize fracture toughness testing. It is uniquely suitable for testing a wide variety of materials used extensively in pressure vessel and piping structural components and weldments, including others such as ceramics, their composites, and concrete. The SNTT system operates by applying pure torsion to uniform cylindrical specimens with a notch line that spirals around the specimen at a 45° pitch. The KIC values are obtained with the aid of a three-dimensional finite-element computer code, TOR3D-KIC, developed at ORNL.

Offset Curves and Surfaces With Continued Fractions

1999 ◽  
Author(s):  
Manhong Wen ◽  
Kwun-Lon Ting
Keyword(s):  
Continued Fractions ◽  
Free Form ◽  
New Approach ◽  
Planar Curves ◽  
Curves And Surfaces ◽  
Cad Cam ◽  
Offset Curves ◽  
Unified Algorithm ◽  
The Relationship ◽  
Spatial Curves

Abstract This paper provides a new approach to approximate the offset of free-form curves and surfaces with continued fractions. The properties of continued fractions are introduced. The convergence of the approximation is proved and the relationship between accuracy and approximate step is established. It shows that the approximation converges fast and reliably, the error of approximation is easily estimated and controlled, and a unified algorithm can be used to generate the rational offset of non-rational and rational planar curves, spatial curves, and surfaces in CAD/CAM industry.

Digital impression in patients with limited mouth opening – a new approach for occlusal splint manufacturing

2018 ◽  
Vol 68 (3) ◽  
pp. 267-278
Author(s):  
Jakub Munk ◽  
Aleksandra Nitecka-Buchta ◽  
Michał Dudkowski ◽  
Stefan Baron
Keyword(s):  
Traditional Approach ◽  
Mouth Opening ◽  
Digital Impression ◽  
Mandibular Movement ◽  
Occlusal Splint ◽  
Limited Mouth Opening ◽  
New Approach ◽  
Technology Preparation ◽  
Cad Cam ◽  
On Line

Limited mouth opening is one of the primary symptoms of masticatory dysfunction. It may be due to muscular pathology or special alterations within the TMJ. If the therapy is not undertaken or abandoned, restricted mandibular movement may persist and the condition will become irreversible. The patient should receive the occlusal splint as soon as mandibular abduction restriction is diagnosed. Taking the impression if the range of opening is between 10-20 cm is not feasible since the impression tray cannot be placed in the patient’s mouth. The application of the TRIOS 3Shape intra-oral scanner enables digital recording of the prosthetic base in the patient’s mouth in the form of a 3-D image. The dimensions of the intra-oral part of the scanner make it possible to scan dental arches even if the range of abduction is very limited. Digital impression can be sent on-line to the dental lab within minutes. With modern CAD/CAM technology, preparation of an occlusal splint takes much shorter than the traditional approach.

scholarly journals Monitoring fatigue damage in different CAD/CAM materials: A new approach with optical coherence tomography

2021 ◽  
Author(s):  
Maximiliane Amelie Schlenz ◽  
Marianne Skroch ◽  
Alexander Schmidt ◽  
Peter Rehmann ◽  
Bernd Wöstmann
Keyword(s):  
Optical Coherence Tomography ◽  
Fatigue Damage ◽  
Optical Coherence ◽  
New Approach ◽  
Cad Cam

Smoothing of SFS Reconstructed Surface Based on Genetic Algorithm

2013 ◽  
Vol 579-580 ◽  
pp. 877-884
Author(s):  
Jun Wang ◽  
Feng He Wu ◽  
Xiu Liang Li ◽  
Jia Chun Wang
Keyword(s):  
Genetic Algorithm ◽  
Evaluation Criteria ◽  
Practical Method ◽  
Constraint Condition ◽  
Surface Smoothing ◽  
New Approach ◽  
Curve Smoothing ◽  
Cad Cam ◽  
Smoothing Process ◽  
Reconstructed Surface

To improve the smoothness of SFS reconstructed surface, a new approach based on genetic algorithm is proposed. First, by analyzing the principle of SFS, the reason for surface error and distortion zone are found. By adding data according to the symmetric and asymmetric principle and B spline, data in the distortion zone are added and the reconstruction of SFS is realized. The evaluation criteria for smoothness of curves and surfaces are given according to the mathematical sense and concurrent level of CAGD/CAD/CAM. The surface smoothing process is turn into two curve smoothing process in two directions. The evaluation criteria is taken as the constraint condition and then the smoothing of SFS reconstructed surface based on the genetic algorithm is realized. The experimental results show that this new approach is an effective way to eliminate the bad points of SFS surface, improve the surface quality so it is a practical method for surface smoothing.

Innovative Approach for Teaching Graphical Engineering Focused on CAD/CAM/CAE Systems

2013 ◽  
Vol 572 ◽  
pp. 311-314
Author(s):  
Juan Carlos Pérez-Cerdán ◽  
Miguel Lorenzo ◽  
Alejandro Reveriego ◽  
Carmen Blanco
Keyword(s):  
Design Process ◽  
Mechanical Engineering ◽  
Innovative Approach ◽  
Structural Components ◽  
New Approach ◽  
Engineering School ◽  
Engineering Problems ◽  
Cad Cam ◽  
The Subject ◽  
The University

A new approach of the teaching of the subject Graphical engineering is developed at the Engineering School of the University of Salamanca, focusing the contents on the use of the CAD/CAM/CAE systems as useful tools for applying engineering problems related with the mechanical engineering instead of describing diverse software options. Thus, the contents of the subject are divided into two blocks, one devoted to the analysis of the results of simulation of movement of diverse mechanisms and the second devoted to the analysis of diverse cases of loading structural components by means of FEA module, both available in the Autodesk Inventor Pro suite which can be downloaded free by the students. This way, students can visualize and realize of the complexity of a design process in engineering.

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