Adaptive tearing and cracking of thin sheets

Abstract

Figure 1: Our method produces realistic tearing and cracking phenomena for thin sheets made from a wide variety of materials such as cork, foil, plastic, metal, or vinyl. These results are achieved using simulation on adaptive meshes that resolve fracture behavior at very high resolution. AbstractThis paper presents a method for adaptive fracture propagation in thin sheets. A high-quality triangle mesh is dynamically restructured to adaptively maintain detail wherever it is required by the simulation. These requirements include refining where cracks are likely to either start or advance. Refinement ensures that the stress distribution around the crack tip is well resolved, which is vital for creating highly detailed, realistic crack paths. The dynamic meshing framework allows subsequent coarsening once areas are no longer likely to produce cracking. This coarsening allows efficient simulation by reducing the total number of active nodes and by preventing the formation of thin slivers around the crack path. A local reprojection scheme and a substepping fracture process help to ensure stability and prevent a loss of plasticity during remeshing. By including bending and stretching plasticity models, the method is able to simulate a large range of materials with very different fracture behaviors.

View-Dependent Adaptive Cloth Simulation with Buckling Compensation

“…For scenes involving multiple characters or large crowds, these savings can be substantial. We have demonstrated our approach in simulations of clothing, but believe that it could equally well be applied to other objects that can be simulated in an adaptive framework, including materials that can crumple [15] or fracture [16].…”

“…Most relevant to our work are techniques for adaptive cloth simulation [10], [11], [12], [13], [14], which use remeshing to resolve detailed wrinkles and folds. The approach of Narain et al [14] has also been extended to efficiently model plastic deformation and sharp creases [15] as well as complex fracture patterns [16]. However, all those techniques are view-independent and element sizing is controlled only by geometrical and dynamical properties of the simulated system.…”

High-resolution brittle fracture simulation with boundary elements

“…Terzopoulos and Fleischer [1988] use a maximal strain threshold, while O'Brien and colleagues [1999; 2002] use a stress-based separation tensor at the nodes of a tetrahedral FEM mesh. This method has been combined with dynamic mesh improvement [Wicke et al 2010], and also modified by Pfaff et al [2014] to fracture thin-plate triangle meshes. Koschier et al [2014] use a similar maximal tensile stress criterion to initiate cracks, and then propagate them until they reach the surface of the object.…”

“…Pfaff et al [2014] propose a local update procedure to mitigate this issue, while Koschier et al [2014] first find such regions and then pick only the point of maximal stress within each region to initiate a fracture.…”

Woodification: User‐Controlled Cambial Growth Modeling

“…Hirota et al [HTK98] similarly applied a layered mass spring model to simulate cracked appearance of bark. Pfaff et al [PNdJO14] restructure a surface mesh to mimic tearing and cracking of thin sheets. Our approach is based on a surface model as well, however it does not focus on thin layers.…”