Structural Modeling of Undersea Cables

1989 ◽  
Vol 111 (4) ◽  
pp. 323-330 ◽  
Author(s):  
R. H. Knapp
Keyword(s):  
Material Properties ◽  
Computer Aided Design ◽  
Structural Model ◽  
Computer Code ◽  
Internal Stresses ◽  
Complex Geometries ◽  
Design Program ◽  
Undersea Cables ◽  
Aided Design ◽  
Nonlinearly Elastic

A structural model for undersea cables is described. This model has been implemented in a computer-aided design program with the capability to determine cable deformations and internal stresses in response to applied loads including tension, twist, bending, pressure and enforced displacements. Complex geometries and nonlinearly elastic material properties can also be treated. Results of a comprehensive series of physical cable tests to validate the computer code are reported.

A Review on Additive Manufacturing of Ceramics

2019 ◽  
Author(s):  
Brooke Mansfield ◽  
Sabrina Torres ◽  
Tianyu Yu ◽  
Dazhong Wu
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Computer Aided Design ◽  
Ceramic Materials ◽  
Complex Geometries ◽  
Laminated Object Manufacturing ◽  
Challenges And Opportunities ◽  
Aided Design ◽  
Binder Jetting

Abstract Additive manufacturing (AM), also known as 3D printing, has been used for rapid prototyping due to its ability to produce parts with complex geometries from computer-aided design files. Currently, polymers and metals are the most commonly used materials for AM. However, ceramic materials have unique mechanical properties such as strength, corrosion resistance, and temperature resistance. This paper provides a review of recent AM techniques for ceramics such as extrusion-based AM, the mechanical properties of additively manufactured ceramics, and the applications of ceramics in various industries, including aerospace, automotive, energy, electronics, and medical. A detailed overview of binder-jetting, laser-assisted processes, laminated object manufacturing (LOM), and material extrusion-based 3D printing is presented. Finally, the challenges and opportunities in AM of ceramics are identified.

Tailor-Made Plate Design and Manufacturing System for Treating Bone Fractures in Small Animals

2013 ◽  
Vol 17 (4) ◽  
pp. 588-597 ◽  
Author(s):  
Akio Doi ◽  
◽  
Hiroki Takahashi ◽  
Bunei Syuto ◽  
Masaaki Katayama ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Structural Model ◽  
Bone Fractures ◽  
Triangular Mesh ◽  
Small Animals ◽  
Veterinary Clinic ◽  
Cad System ◽  
Computed Tomography Images ◽  
Plate Design ◽  
Aided Design

We propose the use of a computer-aided design (CAD) system for treating bone fractures in small animals. During surgical planning, the veterinarian sketches a simple plate by referring to computed tomography images. A CAD operator then uses polygonal approximation (triangulation) of the surface of the bone region to model the plate. After the approximated shape is imported into the CAD system as a triangular mesh, a detailed design of the plate is prepared by referring to the abovementioned sketch. The plate can be designed to match the bone surface since the plate surface follows the curvature of the surface of the exported triangular mesh. The bone shape and the plate are eventually converted into polygons, and a structural model identical to the fractured part of the bone can be reproduced using a 3D printer, which allows for alignment to be performed at full scale. In this study, we examine the applicability of the proposed system by designing the most appropriately shaped plates for bone fracture therapy for small dogs brought to a veterinary clinic for treatment.

A New Developed Interface for CAD/MCNP Data Conversion

2006 ◽  
Author(s):  
Noha Shaaban ◽  
Fukuzo Masuda ◽  
Hesham Nasif ◽  
Masao Yamada ◽  
Hidenori Sawamura ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Geometric Modeling ◽  
Input Data ◽  
Fusion Reactor ◽  
Computer Code ◽  
Data Conversion ◽  
Input File ◽  
Cell Geometry ◽  
Cad System ◽  
Aided Design

In a complex and huge system as in ITER fusion reactor, the creation of the geometrical input data of Monte Carlo (MC) codes such as MCNP is a highly exhausting task. Accordingly, it is a general approach to shift the geometric modeling into a computer aided design (CAD) system and to use an interface, which performs the exchange of CAD data into a representation appropriate for MC code. We have developed efficient algorithms and computer code, which are used to convert Parasolid format CAD files including solid and void data into MCNP input data. The CAD-MCNP conversion processes include creating surface equations; determining surface senses; constructing cell geometry and creating MCNP input file. This paper describes the basic algorithms used for the CAD/MCNP interface along with some applications for different geometries.

scholarly journals Polyoxymethylene as Material for Removable Partial Dentures—A Literature Review and Illustrating Case Report

2021 ◽  
Vol 10 (7) ◽  
pp. 1458
Author(s):  
Oliver Schierz ◽  
Leonie Schmohl ◽  
Sebastian Hahnel ◽  
Angelika Rauch
Keyword(s):  
Material Properties ◽  
Computer Aided Design ◽  
Scientific Data ◽  
Clinical Observations ◽  
Dental Prostheses ◽  
Removable Dental Prostheses ◽  
Computer Aided ◽  
Manufacturing Techniques ◽  
Specific Material ◽  
Aided Design

Compared to thermoplastic manufacturing techniques, computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies made it easier to process modern restorative and prosthetic materials with improved material properties. In dentistry, tooth-colored alternatives to metal-based frameworks for application in removable dental prostheses (RDP) emerged. With regard to this aspect, the current article provides an overview of the specific material properties of polyoxymethylene (POM). Furthermore, it reviews scientific literature indexed in PubMed and Web of Science that focuses on RDPs fabricated from POM within the last 10 years. Finally, a prosthetic rehabilitation of a patient with a RDP fabricated from POM is illustrated and observation during a follow-up over 10 months are described. Scientific data and clinical observations indicate that polyoxymethylene is a promising material that bridges gaps in dental therapeutic options. While survival time may be limited due to wear, POM might be a favorable option for application in semi-permanent restorations.

Setup Planning Automation for Six-Axis Wire Electrical Discharge Machining

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Zhi Yang ◽  
Richard A Wysk ◽  
Sanjay Joshi
Keyword(s):  
Process Planning ◽  
Computer Aided Design ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Complex Geometries ◽  
Rotational Axis ◽  
Wire Electrical Discharge Machining ◽  
Coordinate Systems ◽  
Process Plans ◽  
Aided Design

A modern six-axis wire electrical discharge machining (WEDM) system is capable of producing more complex geometries than 2D, 2½D, or ruled surface parts. The rotational axis on a six-axis WEDM system allows a part to be rotated while using a cutting wire to fabricate it. However, limited automation for process planning six-axis WEDM systems requires significant time and effort must be put into process planning. Even with commercially-available computer-aided design (CAD) software, it is difficult to produce process plans for a six-axis WEDM system. Toward automatic development of process plans, a method of determining such setup plans, including the number of setup orientations and rotational axis movements, is presented in this paper. Tangent visibility analysis results presented in our prior research are used to guide the setup, and intermediate coordinate systems are defined in order to classify the tangent visibility results. A greedy algorithm is developed to determine the set of intermediate coordinates and setup orientations for six-axis WEDM.

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