國立虎尾科技大學 |

Bounding volume hierarchy and non-uniform rational B-splines for contact enforcement in large deformation finite element analysis of sheet metal forming.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Bounding volume hierarchy and non-uniform rational B-splines for contact enforcement in large deformation finite element analysis of sheet metal forming./
作者:	Luet, David Joseph.
面頁冊數:	1 online resource (413 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
標題:	Mechanical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369218589

Bounding volume hierarchy and non-uniform rational B-splines for contact enforcement in large deformation finite element analysis of sheet metal forming.
Luet, David Joseph.

Bounding volume hierarchy and non-uniform rational B-splines for contact enforcement in large deformation finite element analysis of sheet metal forming. - 1 online resource (413 pages)

Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

This dissertation presents a robust and efficient algorithm to enforce the unilateral contact condition, with friction, between a deformable body, modeled with a finite element mesh, and rigid surfaces modeled with a set of independent Non-Uniform Rational B-Splines (NURBS) patches. This algorithm is applied to the simulation of the stamping process.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369218589Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Bounding volume hierarchy and non-uniform rational B-splines for contact enforcement in large deformation finite element analysis of sheet metal forming.
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100 1 $a Luet, David Joseph. $3 1180323
245 1 0 $a Bounding volume hierarchy and non-uniform rational B-splines for contact enforcement in large deformation finite element analysis of sheet metal forming.
264 0 $c 2016
300 $a 1 online resource (413 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
500 $a Adviser: Luigi Martinelli.
502 $a Thesis (Ph.D.) $c Princeton University $d 2016.
504 $a Includes bibliographical references
520 $a This dissertation presents a robust and efficient algorithm to enforce the unilateral contact condition, with friction, between a deformable body, modeled with a finite element mesh, and rigid surfaces modeled with a set of independent Non-Uniform Rational B-Splines (NURBS) patches. This algorithm is applied to the simulation of the stamping process.
520 $a The NURBS patches provide a surface that is accurate, smooth and easy to modify.The contact detection algorithm consists in building a series of surface envelopes called Axis Aligned Minimum Bounding Boxes (AAMBB) that cover the interior of the tools and are organized in hierarchical trees called Bounding Volume Hierarchy (BVH). Efficient tree traversal algorithms are used to build two contact detection tests. The first test inexpensively detects body points that do not penetrate the tools. If a point cannot be guaranteed to not penetrate the tool, its closest point projection on an individual NURBS patch is computed with a fast optimization algorithm that allows for solutions on the edges of a NURBS patch. The second test guarantees that the closest point projection is a global solution to the minimization of the distance between a body point and the entire surface of a tool. The impenetrability condition is enforced with a augmented Lagrangian method. Further, the enforcement of the Coulomb friction law guarantees that the friction force is in the direction opposite to the trajectory of the point and in the tangent plane of the surface. A large deformation elastoplastic constitutive law is used. The deformation gradient is decomposed multiplicatively into its elastic and plastic parts. The hyperelastic model and the plastic strain rate, based on the Lie derivative, guarantee the frame invariance of the constitutive behavior. The deformable body is modeled with solid finite elements with selective integration of the pressure component of the stress to avoid volumetric locking. The resulting system of nonlinear equations is solved with a dynamic relaxation method with adaptive parameters.
520 $a To validate the approach, numerical results are compared with analytical and experimental results. The proposed contact algorithm is shown to be four times faster than a brute force method on a numerical example.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
650 4 $a Mechanics. $3 527684
650 4 $a Automotive engineering. $3 1104081
655 7 $a Electronic books. $2 local $3 554714
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710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Princeton University. $b Mechanical and Aerospace Engineering. $3 845566
773 0 $t Dissertation Abstracts International $g 78-04B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167509 $z click for full text (PQDT)