scholarly journals Generation of Computational 3D Models of Human Bones Based on STL Data and CAD Software Packages

2021 ◽  
Vol 11 (17) ◽  
pp. 7964
Author(s):  
Dan Leordean ◽  
Cristian Vilău ◽  
Mircea Cristian Dudescu
Keyword(s):  
3D Models ◽  
Industrial Applications ◽  
Element Analysis ◽  
Design Engineers ◽  
Software Packages ◽  
Solid Models ◽  
Time Required ◽  
The Right ◽  
3D Solid ◽  
3D Solid Modeling

This paper presents three methods of converting complex 3D models of STL type into solid models. For converting the STL models, specific approximation functions from CATIA and Creo Parametric software were used as well as 3D solid modeling methods that used sketches drawn for sections of the specific analyzed model. This conversion is required to get a solid 3D model that can be used for finite element analysis and to be processed using Boolean functions in specific CAD programs. This paper also presents a study of the effectiveness of FEA in respect to the time required for the analysis of each converted model. The analyzed STL files contain data obtained by computer tomography and are the 3D models of the human orthopedic system: the left zygomatic bone and upper part of the right femur. The presented conversion methods can be used by design engineers both in medical applications (where the complexity of forms is well known) for the design of implants and for industrial applications for reverse engineering.

scholarly journals Comparative Analysis for Internal Fixations of Pauwels II by Biomechanical Finite Element Method

2019 ◽  
Vol 103 (9-10) ◽  
pp. 493-504
Author(s):  
Matthew Jian-Qiao Peng ◽  
Xiangyang Ju ◽  
Hai-Yan Chen ◽  
Bai Bo ◽  
XinXu Li
Keyword(s):  
Finite Element ◽  
South Carolina ◽  
Femoral Neck ◽  
Femoral Neck Fracture ◽  
3D Models ◽  
Secondary Fracture ◽  
Solid Models ◽  
Neck Fracture ◽  
Hip Screw ◽  
3D Solid

Purpose: A series models of surgical internal fixation for femoral neck fracture of Pauwels II will be constructed by an innovative approach of finite element so as to determine the most stable fixation by comparison of their biomechanical performance. Method: Seventeen specimens of proximal femurs scanned by computed tomography in Digital Imaging and Communications in Medicine (DICOM) format were input onto Mimics rebuilding 3D models; their stereolithography (STL) format dataset were imported into Geomagic Studio (3D Systems, Rock Hill, South Carolina) for simulative osteotomy and non-uniform rational basis spline kartograph; the generated IGS dataset were interacted by UG to fit simulative 3D-solid models; 3 sorts of internal fixators were expressed in 3D model by ProE (PTC, Boston, Connecticut) program virtually. Processed by HyperMesh (Altair, Troy, Michigan), all compartments (fracture model + internal immobilization) were assembled onto 3 systems actually as: Dynamic hip screw (DHS) / Lag screw (LS) / DHS+LS. Eventually, a numerical model of finite elemental analysis was exported to ANSYS for solution. Result: Three models of internal fixations for femoral neck fracture of Pauwels II were established and validated effectively, the stress and displacement of each internal pin were analyzed, the advantages of each surgical therapy for femoral neck fracture of Pauwels II were compared and demonstrated synthetically as: “The contact stress of 3-LS-system was checked to be the least; the interfragmentary displacement of DHS+1-LS assemblages was assessed to be the least.” Conclusion: 3-LS-system is recommended to be a clinical optimization for Pauwels II femoral neck facture, by this therapeutic fixation mechanically, breakage of fixators, or secondary fracture rarely occurs.

Hysteresis in Interoperability: Workflows Involving Multiple Representations of 3D Models

2016 ◽  
Author(s):  
Prakhar Jaiswal ◽  
Rahul Rai ◽  
Saigopal Nelaturi
Keyword(s):  
Information Content ◽  
Cell Biology ◽  
3D Models ◽  
Future Research ◽  
3D Objects ◽  
Solid Models ◽  
Geometrical Information ◽  
Pertinent Information ◽  
3D Solid

Various 3D solid model representation schemes are developed to capture and process geometrical information of physical 3D objects as accurately and precisely as possible with the consideration of storage and computational complexity. These representation schemes are error prone, and their limitations prohibit them to capture all the pertinent information perfectly for a complex 3D object. Many applications in design involve repetitive conversions between several representation schemes to efficiently evaluate and operate on solid models. Mapping one representation to other degrades the quality, correctness, and completeness of the information content. In this paper, we quantify the degradation of the proxy representation models by taking inspiration from the hysteresis concept applied in different fields, such as magnetism, mechanics, control systems, cell biology, and economics. We propose a method to compute the error remanence using quantitative measures of information content and quality of proxy models. We also discuss the areas of future research such as sequencing of operations in computational work-flows that would benefit by utilizing the error remanence metric.

A Finite Element Analysis of the Normal Combination Round and Spline Broach Based on ANSYS

2011 ◽  
Vol 383-390 ◽  
pp. 1831-1836
Author(s):  
Guang Guo Zhang ◽  
Jing Sheng ◽  
Feng Wang
Keyword(s):  
3D Model ◽  
Machining Accuracy ◽  
Element Analysis ◽  
Partial Fracture ◽  
Whole Process ◽  
Traditional Design ◽  
Design Cycle ◽  
3D Solid ◽  
The Impact ◽  
3D Solid Modeling

In the traditional design of round broach ,the impact tools of broach maybe unable to achieve the requirements for the processing precision, or even occur the situation of partial fracture due to a exaggerated partial deformation. In this article, by using Pro/E we complete the 3D solid modeling and the dimensional parameterization of the impact tools for combination round and spline broach, then import the 3D model into ANSYS, to analyze and solve the whole process of load and deformation at work. It can effectively improve the machining accuracy and the reliability of round broach, shorten the design cycle and reduce cost.

CAD Based Drilling Simulations for Al7075

2015 ◽  
Vol 760 ◽  
pp. 87-92
Author(s):  
Panagiotis Kyratsis ◽  
Athanasios Manavis
Keyword(s):  
Kinematic Model ◽  
Tool Material ◽  
Application Programming Interface ◽  
3D Models ◽  
Direct Access ◽  
Cad System ◽  
Solid Models ◽  
Drilling Tools ◽  
3D Solid ◽  
New Applications

Drilling is considered to be one of the mostly used processes for holemaking. Researchers have followed three different approaches for its simulation i.e. analytic, experimental and numerical. Nowadays the direct access of scientists to the Application Programming Interface (API) of several CAD systems led to an increased number of finite element simulations based on CAD 3D models of drilling tools. The present paper uses a CAD system and via its API a kinematic model is created. Different tool parameters and cutting conditions are introduced; a series of 3D solid models for the tool, the workpieces and the undeformed chips are created and the resulted thrust forces are predicted in both the main edges and the chisel edge. The proposed methodology is experimentally verified using Al7075 for the workpiece and HSS for the tool material. In addition, it provides the basis for a series of new applications in other manufacturing processes based on CAD created geometries.

Analyzing up Front

2000 ◽  
Vol 122 (10) ◽  
pp. 88-91 ◽  
Author(s):  
Jean Thilmany
Keyword(s):  
Lead Time ◽  
Stress Tests ◽  
Element Analysis ◽  
Design Engineers ◽  
Software Packages ◽  
Engineering Company ◽  
Computer Aided ◽  
Depth Study ◽  
The Relationship ◽  
Senior Engineer

This article highlights that up-front computer-aided engineering (CAE) dramatically decreases product lead time. Up-front CAE entails vesting responsibility for performing finite element analysis tests and other analysis tests with the design engineers. The designers use specific software packages to analyze their first-stage designs. This way, they can easily change designs that do not pass analysis tests-such as vibration or stress tests-before passing them on to an analyst for in-depth study. Not every engineering company, however, is turning to up-front CAE even as it faces the need to get products to market faster. Some engineers, like Zlatko Penzar, find that their present analysis hierarchy works just fine. He is a senior engineer for the fuel systems division of Mannesmann in Dusseldorf, Germany, another auto components supplier. Engineering departments have to find their own answer to the relationship between designer and analyst. The important thing is that once an answer is agreed upon, it happens the same way every day. A working atmosphere that functions reliably and smoothly is really the key to successful product design.

A Finite Element Analysis of the Normal Combination Round and Spline Broach Based on ANASYS

2012 ◽  
Vol 433-440 ◽  
pp. 6551-6557
Author(s):  
Guang Guo Zhang ◽  
Jing Sheng ◽  
Feng Wang
Keyword(s):  
3D Model ◽  
Machining Accuracy ◽  
Element Analysis ◽  
Partial Fracture ◽  
Whole Process ◽  
Traditional Design ◽  
Design Cycle ◽  
3D Solid ◽  
The Impact ◽  
3D Solid Modeling

In the traditional design of round broach ,the impact tools of broach maybe unable to achieve the requirements for the processing precision,or even occur the situation of partial fracture due to a exaggerated partial deformation.In this article,by using Pro/E we complete the 3D solid modeling and the dimensional parameterization of the impact tools for combination round and spline broach,then import the 3D model into ANSYS,to analyze and solve the whole process of load and deformation at work.It can effectively improve the machining accuracy and the reliability of round broach, shorten the design cycle and reduce cost.

A Finite Element Analysis of the Rectangle Spline Broach

2014 ◽  
Vol 687-691 ◽  
pp. 163-166
Author(s):  
Zhuo Tian ◽  
Bai Cheng Li
Keyword(s):  
3D Model ◽  
Machining Accuracy ◽  
Element Analysis ◽  
Partial Fracture ◽  
Whole Process ◽  
Traditional Design ◽  
Design Cycle ◽  
3D Solid ◽  
The Impact ◽  
3D Solid Modeling

In the traditional design,the impact tools of broach maybe unable to achieve the requirements for the processing precision,or even occur the situation of partial fracture due to a exaggerated partial deformation.In this article,by using Pro/E we complete the 3D solid modeling and the dimensional parameterization of the impact tools for rectangle spline broach,then import the 3D model into ANSYS,to analyze and solve the whole process of load and deformation at work.It can effectively improve the machining accuracy and the reliability of broach, shorten the design cycle and reduce cost.

The Design and Finite Element Analysis of the Installation to Smash Banana Stem

2013 ◽  
Vol 791-793 ◽  
pp. 694-698 ◽  
Author(s):  
Kan Zheng ◽  
Xi Rui Zhang ◽  
Dong Liang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Economic Benefits ◽  
Environment Pollution ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Main Components ◽  
3D Solid ◽  
3D Solid Modeling ◽  
Banana Stem

Aiming at the huge waste, low utilization of banana stem fiber and the environment pollution caused by it, the author redesign one of the main components of the crumple machine--the crushing device, build the device's 3D solid modeling with the Solidworks software, based on the finite element modelSolidworks Simulation, make the finite element analysis and discuss of the crushing blade under the proper operating condition .The design is safe and reliable according to the analysis, and would be great help to promote the comprehensive utilization of bananas stem fiber in the main producing areas and raise the economic benefits of banana cultivation.

Shape Comparison of 3D Models Based on Features and Parameters

2008 ◽  
Author(s):  
Karthik Viswanathan ◽  
Sagar Chowdhury ◽  
Zahed Siddique
Keyword(s):  
Computer Aided Design ◽  
Product Family ◽  
3D Models ◽  
3D Cad ◽  
Solid Models ◽  
Cad Models ◽  
3D Solid ◽  
Aided Design ◽  
Distinct Features ◽  
Common Platform

Computer-Aided Design (CAD) is used extensively during mechanical product design, which involves creating 3D models of components and then assembling them into modules and systems. Methods and tools to compare components and identify a common platform using these 3D CAD models of components would facilitate faster specification of product family architecture. Hence, there is a need to develop means for comparing component geometry, in order to identify the common and distinct features, determine component commonality, and identify a common platform for the set of components. This paper presents an approach to determine geometric commonality between components from their 3D solid models. The approach consists of performing a pair-wise comparison between components. To measure commonality for a pair of components, first all feature-pair’s dimensions and positions are measured, which then combined to give the overall component-pair commonality.

Research on the Axial Bearing Capacity of Concrete-Filled Rectangular Steel Tube Short Column

2013 ◽  
Vol 368-370 ◽  
pp. 1710-1717 ◽  
Author(s):  
Yan E Hao ◽  
Yong Qiang Lan
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Steel Tube ◽  
Linear Regression Method ◽  
Element Analysis ◽  
Short Column ◽  
Loading Method ◽  
Multiple Linear Regression Method ◽  
3D Solid ◽  
3D Solid Modeling

Under the action of axial compression, it is difficult to deduce the capacity of concrete-filled rectangular steel tube (CFRST) short column in theory because of the complex constraining force between the steel tube and concrete. This paper uses two methods to study the axial bearing capacity of CFRST short column, the first method is to consider the main factors influencing the axial bearing capacity of CFRST column based on a great deal of experiments and use multiple linear regression method of mathematical statistics to obtain the formula of the axial bearing capacity of CFRST short column; the second method is to simulate the axial compression test of CFRST short column by using the powerful structure finite element analysis software ANSYS, and determine the axial bearing capacity of CFRST short column through 3D solid modeling, rational meshing and correct loading method. Those two methods provide new thoughts for forecasting the axial bearing capacity of CFRST short column.

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