Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsCrack Propagation and Stress Field for 2D Tensile Loadshttp://demonstrations.wolfram.com/CrackPropagationAndStressFieldFor2DTensileLoads/]]>http://demonstrations.wolfram.com/CrackPropagationAndStressFieldFor2DTensileLoads/