Graphical modeling and animation of ductile fracture

O’Brien, James F.; Bargteil, Adam W.; Hodgins, Jessica K.

doi:10.1145/2931127.2931215

Cited by 134 publications

(55 citation statements)

References 13 publications

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“…O'Brien et al proposed brittle fracture simulations with the FEM. Later, O'Brien et al again presented ductile fracture as well. Although FEM can well define the orientation of fractures, it cannot determine the forward direction of crack tips.…”

Section: Related Workmentioning

confidence: 98%

Predicting brittle fracture surface shape from a versatile database

Huang

Kitaoka

2018

Computer Animation & Virtual

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In this paper, we propose a novel data-driven method that uses a machine learning scheme for formulating fracture simulation with the boundary element method (BEM) as a regression problem. With this method, the crack opening displacement (COD) of every correlation node is predicted at the next frame.In our naive prediction, we design a feature vector directly exploiting stress intensities and toughness at the current frame so that our method predicts the COD at the next frame more reliably. Thus, there is no need to solve the original linear BEM system to calculate displacements. This enables us to propagate crack fronts using the estimated stress intensities. There are existing works that use the machine learning approach to accelerate the speed of traditional physics-based simulations like smoke and fluid, but our work is the first to incorporate the machine learning scheme into BEM-based fracture simulations. Our implementation accelerates the acquisition of displacements in linear time over the number of crack fronts at each time step compared with the conventional solution whose time complexity grows exponentially based on the BEM linear system. The databases generated by our method are versatile and can be applied to general situations and different models. KEYWORDS boundary element method, brittle fracture, data-driven, regression forest Comput Anim Virtual Worlds. 2019;30:e1865.wileyonlinelibrary.com/journal/cav is the graduate student from the Graduate School of Interdisciplinary Information Studies, The University of Tokyo, Japan. His research interests include computer animation and machine learning.Yonghang Yu received her master's degree from the Graduate School of Arts and Sciences, The University of Tokyo, Japan. Her research interests include computer animation and machine learning. She currently works as a researcher at Y-Lab Beijing Kwai Technology Co., Ltd.

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Section: Related Workmentioning

confidence: 98%

Predicting brittle fracture surface shape from a versatile database

Huang

Kitaoka

2018

Computer Animation & Virtual

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“…O'Brien et al adapted the fracture simulation technique based on continuous mechanics developed in engineering fields to computer graphics and obtain a more realistic fracture. Their techniques had been extended to ductile fractures in . Smith et al improved the lattice‐based fracture simulation technique using rigid‐force constraint computation to avoid stiff springs.…”

Section: Related Workmentioning

confidence: 99%

Practical simulation of hierarchical brittle fracture

Shin

Jun

2012

Computer Animation & Virtual

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A novel practical method for brittle fracture simulation is presented. Our fracture model is represented by a tree structure, and all elementary fracture pieces are hierarchically connected. Each node in a fracture tree has a glue table to define connections and strengths among its child nodes. With our hierarchical fracture method, one can control the whole process of fracture formulation and simulation in a more direct way. Given an input object, a hierarchical fracture pattern is constructed by a series of recursive decompositions where the variation of fragment sizes can be intuitively controlled through a drawing interface. A noise pattern is applied on the interfaces of fragments for adding a natural look. A new simple and practical fracture criterion is also introduced, and we capture the difference of virtual and inherited velocities of fracture nodes to break the connection. Our fracture criterion is fast and robust because it does not involve any matrix solves or finite element analysis that is essential in the prior fracturing algorithms. We implement the proposed method on a fluid solver by extending a rigid body interaction unit, and as a result, we achieve that the fracture objects can interact with fluid and ordinary rigid bodies in a fully two-way manner.

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“…Similarly, ] fracture between element boundaries in a FFD framework and maintain a watertight embedded surface mesh, however their fracture surfaces are quite limited by the coarse simulation mesh. The state of the art in fracture for computer graphics is the work of [O'Brien and Hodgins 1999;Yngve et al 2000;O'Brien et al 2002] which used a pseudo principal stress and continuous remeshing.…”

Section: Related Workmentioning

confidence: 99%

“…For triangles, out-of-plane forces are computed with the bending model of [Bridson et al 2003]. In addition, a multiplicative plasticity component (as opposed to the additive plasticity in [O'Brien et al 2002]) is included to model ductile fracture, see e.g. [Armero and Love 2003].…”

Section: Dynamicsmentioning

confidence: 99%

“…However, disappearing tetrahedra destroy the visual accuracy. A nice compromise between fully remeshing and only fracturing between elements was struck by [O'Brien and Hodgins 1999;O'Brien et al 2002] where cuts are constrained to go through existing nodes. It was further necessary to impose limitations upon the directions of these cracks to avoid backcracking and low quality elements that compromised the stability of their explicit time integration scheme.…”

Section: Introductionmentioning

confidence: 99%

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A virtual node algorithm for changing mesh topology during simulation

Molino¹,

Bao²,

Fedkiw³

2005

ACM SIGGRAPH 2005 Courses on - SIGGRAPH '05

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We propose a virtual node algorithm that allows material to separate along arbitrary (possibly branched) piecewise linear paths through a mesh. The material within an element is fragmented by creating several replicas of the element and assigning a portion of real material to each replica. This results in elements that contain both real material and empty regions. The missing material is contained in another copy (or copies) of this element. Our new virtual node algorithm automatically determines the number of replicas and the assignment of material to each. Moreover, it provides the degrees of freedom required to simulate the partially or fully fragmented material in a fashion consistent with the embedded geometry. This approach enables efficient simulation of complex geometry with a simple mesh, i.e. the geometry need not align itself with element boundaries. It also alleviates many shortcomings of traditional Lagrangian simulation techniques for meshes with changing topology. For example, slivers do not require small CFL time step restrictions since they are embedded in well shaped larger elements. To enable robust simulation of embedded geometry, we propose new algorithms for handling rigid body and self collisions. In addition, we present several mechanisms for influencing and controlling fracture with grain boundaries, prescoring, etc. We illustrate our method for both volumetric and thin-shell simulations.

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Graphical modeling and animation of ductile fracture

Cited by 134 publications

References 13 publications

Predicting brittle fracture surface shape from a versatile database

Predicting brittle fracture surface shape from a versatile database

Practical simulation of hierarchical brittle fracture

A virtual node algorithm for changing mesh topology during simulation

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