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Author |
Chen, Z.; Chen, Y. |
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Title |
Selection of build orientation with minimum tensile strain |
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Journal Article |
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Year |
2010 |
Publication |
Computer-Aided Design and Applications |
Abbreviated Journal |
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Volume |
7 |
Issue |
5 |
Pages |
639-647 |
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Keywords |
Concurrent engineering;Job analysis;Laser heating;Mechanical properties;Optimization;Rapid prototyping;Sintering;Tensile testing; |
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Abstract |
Parts built from rapid prototyping processes have heterogeneous properties in both geometric form and mechanical strength. Build orientation is one of the key factors that determine how such properties are distributed in the parts. In previous studies, the selection of build orientations for the shortest build time, the best part accuracy has been reported. This study aims to investigate how to determine the build orientation so that a part built in the orientation can be subjected to the same load with the minimum deformation or strain. In the research, the selective laser sintering (SLS) technique has been used to make the test specimens. The relationships between stress/strain against build orientations are obtained through tensile test experiments. Such relationships are modeled as mathematic equations which are used for the selection of the best build orientation so that parts built in such orientation will have minimum tensile strain when subjected to the same load pattern. © 2010 CAD Solutions, LLC. |
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P. O. Box 48693, Tampa, FL 33647-0123, United States |
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1686-4360 |
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Build direction;Build orientation;Build time;Geometric form;Key factors;Load patterns;Mechanical strength;Prototyping process;Selection of the best;Selective laser sintering;Stress/strain;Tensile tests;Test specimens; |
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Call Number |
refbase @ user @ Chen2010c |
Serial |
11560 |
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Author |
Bassi, R.; Bedi, S.; Bolanos, G.S. |
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Title |
Undercut free parting direction determination for injection molded parts using surface based accessibility analysis |
Type |
Journal Article |
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Year |
2010 |
Publication |
Computer-Aided Design and Applications |
Abbreviated Journal |
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Volume |
7 |
Issue |
5 |
Pages |
621-637 |
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Keywords |
Injection molding; |
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Abstract |
A novel approach to determine the undercut free parting direction of a given mold part, in B-rep format, by using the accessibility of each of its surface is presented. The proposed system is designed to classify planar, ruled and freeform part surfaces based upon the criteria of their accessibility relative to the specified directions. The orientation of each surface with respect to the considered direction is used as an input for the accessibility analysis module. To analyze the accessibility, the surfaces are swept in the different directions, based on their orientation, to form solid bodies. A number of regularized Boolean operations are performed on the swept bodies. Then, volume and geometry-based constraints are applied to classify the part surfaces based on the accessibility. Using the results of accessibility analysis in a given set of directions, feasible mold parting directions are determined. The method has been successfully implemented and tested on benchmark parts. © 2010 CAD Solutions, LLC. |
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Place of Publication |
P. O. Box 48693, Tampa, FL 33647-0123, United States |
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1686-4360 |
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Boolean operations;Core/cavity surfaces;Freeforms;Injection molded part;Mold design;Part surface;Parting direction;Solid bodies;Surface-based; |
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no |
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Call Number |
refbase @ user @ Bassi2010 |
Serial |
11517 |
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Author |
Sellamani, S.; Muthuganapathy, R.; Kalyanaraman, Y.; Murugappan, S.; Goyal, M.; Ramani, K.; Hoffman, C.M. |
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Title |
PCS: Prominent cross-sections for mesh models |
Type |
Journal Article |
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Year |
2010 |
Publication |
Computer-Aided Design and Applications |
Abbreviated Journal |
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Volume |
7 |
Issue |
4 |
Pages |
601-620 |
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Keywords |
Models; |
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Abstract |
Analysis of mesh models is gaining prominence as it has wide range of applications from engineering to medicine. In this paper, we present a method for analyzing meshes through the abstraction of its prominent cross-sections (PCS). An algorithm that can robustly yield prominent cross-section at any point on the mesh that approximates the local sweep has been presented. Two types of prominent crosssections, full (FPCS) and partial (PPCS) are defined and computed over the model. These cross-sections, that cover the object, can then be used in further analysis. Skeleton computation and shape matching using prominent cross-sections have been demonstrated. © 2010 CAD Solutions, LLC. |
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Place of Publication |
P. O. Box 48693, Tampa, FL 33647-0123, United States |
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ISSN |
1686-4360 |
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Notes |
3d search;Mesh analysis;Mesh model;Shape matching;Skeleton computation; |
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Call Number |
refbase @ user @ Sellamani2010 |
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11837 |
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Author |
Makki, M.; Tournier, C.; Thiebaut, F.; Lartigue, C.; Souzani, C. |
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Title |
5-axis direct machining of rough clouds of points |
Type |
Journal Article |
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Year |
2010 |
Publication |
Computer-Aided Design and Applications |
Abbreviated Journal |
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Volume |
7 |
Issue |
4 |
Pages |
591-600 |
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Keywords |
Machine tools;Milling (machining);Optimization;Visibility; |
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Abstract |
Direct duplication of free-forms by 5-axis machining consists in the machining of rough clouds of points without surface reconstruction, with the aim at minimizing deviations between the original object and its copy. As discrete 5-axis machining is concerned, the surface is machined area by area with various tool orientations. However, the quality of the machine tool geometry may be source of overlapping errors at area junctions. In the paper, a method for direct duplication by discrete 5- axis machining is proposed. Data segmentation into areas relies on the global visibility of the points, including the visibility of the point cloud by the machine tool. A criterion accounting for the minimization of the overlapping area is also introduced to ensure the quality of the machined object. © 2010 CAD Solutions, LLC. |
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Place of Publication |
P. O. Box 48693, Tampa, FL 33647-0123, United States |
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ISSN |
1686-4360 |
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Notes |
5-Axis machining;5-axis milling;Data segmentation;Freeforms;Geometrical deviations;Global visibility;Overlapping area;Point cloud;Tool geometry;Tool orientation; |
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Call Number |
refbase @ user @ Makki2010 |
Serial |
11743 |
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Author |
Yang, J.; Dai, J. |
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Title |
Simulation-based assessment of rear effect to ballistic helmet impact |
Type |
Journal Article |
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Year |
2010 |
Publication |
Computer-Aided Design and Applications |
Abbreviated Journal |
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Volume |
7 |
Issue |
1 |
Pages |
59-73 |
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Keywords |
Brain;Channel capacity;Projectiles;Safety devices; |
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Abstract |
Ballistic impact is one of the major causes for traumatic brain injury (TBI) and ballistic helmets are designed to provide protection from TBI. In real life, it is impossible to use real human subjects for experiments. Therefore, simulation based-methods are convenient to assess the rear effect to ballistic helmet impact and can provide crucial insights to injury. Rear effect happens when the interior of helmet is deformed and contacts with the human head. This paper proposes a simulation-based method to study the rear effect by using Head Injury Criterion (HIC) when the ballistic helmeted headform is impacted by a bullet with different impact angles and at various impact positions. Commercial software package LS-DYNA is employed to simulate the impact. A high fidelity headform model including detailed skull and brain has been used for the simulation purpose. Helmet and bullet are modeled according to the real shapes. The results show that, with a larger impact angle, the HIC score is smaller and therefore there is less damage to the brain. Based on the HIC scores obtained from the impact simulations at various impact positions, the bullet from back is the most dangerous position to the wearer. © 2010 CAD Solutions, LLC. |
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Publisher |
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Place of Publication |
P. O. Box 48693, Tampa, FL 33647-0123, United States |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1686-4360 |
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Notes |
Ballistic impact;Commercial software;Head injury criterion;High fidelity;High fidelity headform model;Human head;Human subjects;Impact angles;Impact simulation;LS-DYNA;Simulation-based;Simulation-based method;Traumatic Brain Injuries; |
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Call Number |
refbase @ user @ Yang2010 |
Serial |
11939 |
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