Difference between revisions of "Crack Settings"

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== Introduction ==
== Introduction ==


The extension of MPM to model explicit cracks is called CRAMP for CRAcks in the Material Point Method. It is described first in a paper by Nairn (2003).<ref name='CRAMP'>J. A. Nairn, "Material Point Method Calculations with Explicit Cracks," <i>Computer Modeling in Engineering &amp; Sciences</i>, <b>4</b>, 649-664 (2003). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/MPMCracks.pdf See PDF])</ref>. Some other papers discuss calculation of J integral and stress intensity factor,<ref name="GuoJ">Y. Guo and J. A. Nairn, "Calculation of J-Integral and Stress Intensity Factors using the Material Point Method," <i>Computer Modeling in Engineering &amp; Sciences</i>, <b>6</b>, 295-308 (2004). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/MPMTwoDJ.pdf See PDF])</ref>, propose energy balance propagation,<ref name="EB">J. A. Nairn, "Simulation of Crack Growth in Ductile Materials,"; <i>Engr. Fract. Mech.</i>, <b>72</b>, 961-979 (2005). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/Dugdale.pdf See PDF])</ref> cracks in 3D (although not currently available in [[NairnMPM]],<ref name="Guo3D">Y. Guo and J. A. Nairn, "Three-Dimensional Dynamic Fracture Analysis Using the Material Point Method," <i>Computer Modeling in Eng. &amp; Sci.</i>, <b>16</b>, 141-156 (2006). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/guo3D.pdf See PDF])</ref>, use of cracks as imperfect interfaces,<ref name="IIC">J. A. Nairn, "Numerical Implementation of Imperfect Interfaces, <i>Computational Materials Science</i>, <b>40</b>, 525-536 (2007). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/Interface.pdf See PDF])</ref>, and the use of traction laws with cracks.<ref name="RCurve">J. A. Nairn, "Analytical and Numerical Modeling of R Curves for Cracks with Bridging Zones," <i>Int. J. Fracture</i>, <b>155</b>, 167-181 (2009). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/JBridging.pdf See PDF])</ref> Some applications of using cracks in MPM include wood fracture,<ref name="wood">J. A. Nairn, "Material Point Method Simulations of Transverse Fracture in Wood with Realistic Morphologies," <i>Holzforschung</i>,  <b>61</b>, 375-381 (2007). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/FractureSim.pdf See PDF])</ref> use of cracks to model glue bods in oriented strand board,<ref name="OSB">J. A. Nairn and E. Le, "Numerical Modeling and Experiments on the Role of Strand-to-Strand Interface Quality on the Properties of Oriented Strand Board," <i>Proc of 9th Int. Conf. on Wood Adhesives</i>, Lake Tahoe, Neveda, USA, Sept. 28-30, 2009. ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/WoodAd2009.pdf See PDF])</ref>. simulation of dynamic fracture,<ref name="BardF">S. G. Bardenhagen, J.A. Nairn, and H. Lu, "Simulation of dynamic fracture with the Material Point Method using a mixed J-integral and cohesive law approach," <i>Int. J. Fracture</i>, <b>170</b>, 49-66 (2011).</ref>, simulation of crack growth with fiber bridging.<ref name="MDF">N. Matsumoto and J.A. Nairn, "Fracture Toughness of Wood and Wood Composites During Crack Propagation," <i>Wood and Fiber Science</i>, <b>in press</b> (2012). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/WoodToughness.pdf See PDF])</ref>
The extension of MPM to model explicit cracks is called CRAMP for CRAcks in the Material Point Method. It is described first in a paper by Nairn (2003).<ref name='CRAMP'>J. A. Nairn, "Material Point Method Calculations with Explicit Cracks," <i>Computer Modeling in Engineering &amp; Sciences</i>, <b>4</b>, 649-664 (2003). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/MPMCracks.pdf See PDF])</ref>. Some other papers discuss calculation of J integral and stress intensity factor,<ref name="GuoJ">Y. Guo and J. A. Nairn, "Calculation of J-Integral and Stress Intensity Factors using the Material Point Method," <i>Computer Modeling in Engineering &amp; Sciences</i>, <b>6</b>, 295-308 (2004). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/MPMTwoDJ.pdf See PDF])</ref>, propose energy balance propagation,<ref name="EB">J. A. Nairn, "Simulation of Crack Growth in Ductile Materials,"; <i>Engr. Fract. Mech.</i>, <b>72</b>, 961-979 (2005). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/Dugdale.pdf See PDF])</ref> handle cracks in 3D (although not currently available in [[NairnMPM]],<ref name="Guo3D">Y. Guo and J. A. Nairn, "Three-Dimensional Dynamic Fracture Analysis Using the Material Point Method," <i>Computer Modeling in Eng. &amp; Sci.</i>, <b>16</b>, 141-156 (2006). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/guo3D.pdf See PDF])</ref>, use of cracks as imperfect interfaces,<ref name="IIC">J. A. Nairn, "Numerical Implementation of Imperfect Interfaces, <i>Computational Materials Science</i>, <b>40</b>, 525-536 (2007). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/Interface.pdf See PDF])</ref>, and the use of traction laws with cracks.<ref name="RCurve">J. A. Nairn, "Analytical and Numerical Modeling of R Curves for Cracks with Bridging Zones," <i>Int. J. Fracture</i>, <b>155</b>, 167-181 (2009). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/JBridging.pdf See PDF])</ref> Some applications of using cracks in MPM include wood fracture,<ref name="wood">J. A. Nairn, "Material Point Method Simulations of Transverse Fracture in Wood with Realistic Morphologies," <i>Holzforschung</i>,  <b>61</b>, 375-381 (2007). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/FractureSim.pdf See PDF])</ref> use of cracks to model glue bods in oriented strand board,<ref name="OSB">J. A. Nairn and E. Le, "Numerical Modeling and Experiments on the Role of Strand-to-Strand Interface Quality on the Properties of Oriented Strand Board," <i>Proc of 9th Int. Conf. on Wood Adhesives</i>, Lake Tahoe, Neveda, USA, Sept. 28-30, 2009. ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/WoodAd2009.pdf See PDF])</ref>. simulation of dynamic fracture,<ref name="BardF">S. G. Bardenhagen, J.A. Nairn, and H. Lu, "Simulation of dynamic fracture with the Material Point Method using a mixed J-integral and cohesive law approach," <i>Int. J. Fracture</i>, <b>170</b>, 49-66 (2011).</ref>, simulation of crack growth with fiber bridging.<ref name="MDF">N. Matsumoto and J.A. Nairn, "Fracture Toughness of Wood and Wood Composites During Crack Propagation," <i>Wood and Fiber Science</i>, <b>in press</b> (2012). ([http://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/WoodToughness.pdf See PDF])</ref>


== Crack Settings Commands ==
== Crack Settings Commands ==

Revision as of 11:53, 28 September 2013

These command control modeling of explicit cracks and whether or not those cracks propagate

Introduction

The extension of MPM to model explicit cracks is called CRAMP for CRAcks in the Material Point Method. It is described first in a paper by Nairn (2003).[1]. Some other papers discuss calculation of J integral and stress intensity factor,[2], propose energy balance propagation,[3] handle cracks in 3D (although not currently available in NairnMPM,[4], use of cracks as imperfect interfaces,[5], and the use of traction laws with cracks.[6] Some applications of using cracks in MPM include wood fracture,[7] use of cracks to model glue bods in oriented strand board,[8]. simulation of dynamic fracture,[9], simulation of crack growth with fiber bridging.[10]

Crack Settings Commands

In scripted files, crack properties are controlled by these possible commands 

(Crack Propagation Commands)
Friction
Imperfect Interface
JContour
ContactPosition
MovePlane

In XML input file, all global crack setting commands are within a <Cracks> element that must be within the <MPMHeader>: 

<Cracks>
  (Crack Propagation Commands)
  <Friction>0.3</Friction>
  <JContour type='1' size="2" terms="1"/>
  <ContactPosition>0.8</ContactPosition>
  <MovePlane type='avg' prevent='no'/>

</Cracks>

The Crack Propagation Commands are described in a separate help top. The other commands are describe in the following sections.

Crack Contact Properties

J Integral Contour Settings

Crack ContactPosition Command

Crack Plane Updating

Notes

References

  1. ↑ J. A. Nairn, "Material Point Method Calculations with Explicit Cracks," Computer Modeling in Engineering & Sciences, 4, 649-664 (2003). (See PDF)
  2. ↑ Y. Guo and J. A. Nairn, "Calculation of J-Integral and Stress Intensity Factors using the Material Point Method," Computer Modeling in Engineering & Sciences, 6, 295-308 (2004). (See PDF)
  3. ↑ J. A. Nairn, "Simulation of Crack Growth in Ductile Materials,"; Engr. Fract. Mech., 72, 961-979 (2005). (See PDF)
  4. ↑ Y. Guo and J. A. Nairn, "Three-Dimensional Dynamic Fracture Analysis Using the Material Point Method," Computer Modeling in Eng. & Sci., 16, 141-156 (2006). (See PDF)
  5. ↑ J. A. Nairn, "Numerical Implementation of Imperfect Interfaces, Computational Materials Science, 40, 525-536 (2007). (See PDF)
  6. ↑ J. A. Nairn, "Analytical and Numerical Modeling of R Curves for Cracks with Bridging Zones," Int. J. Fracture, 155, 167-181 (2009). (See PDF)
  7. ↑ J. A. Nairn, "Material Point Method Simulations of Transverse Fracture in Wood with Realistic Morphologies," Holzforschung, 61, 375-381 (2007). (See PDF)
  8. ↑ J. A. Nairn and E. Le, "Numerical Modeling and Experiments on the Role of Strand-to-Strand Interface Quality on the Properties of Oriented Strand Board," Proc of 9th Int. Conf. on Wood Adhesives, Lake Tahoe, Neveda, USA, Sept. 28-30, 2009. (See PDF)
  9. ↑ S. G. Bardenhagen, J.A. Nairn, and H. Lu, "Simulation of dynamic fracture with the Material Point Method using a mixed J-integral and cohesive law approach," Int. J. Fracture, 170, 49-66 (2011).
  10. ↑ N. Matsumoto and J.A. Nairn, "Fracture Toughness of Wood and Wood Composites During Crack Propagation," Wood and Fiber Science, in press (2012). (See PDF)
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