# COMPUTER TUTORIAL – Modelling 2D problems

Jul 7th, 2015
Studypool Tutor
Central State University
Course: general
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Plane strain crack model This model will be constructed in STRAND7. The dimensions are those of the test specimen used in the experiment in fracture mechanics. STRAND7 can import CAD geometry, but cannot create geometry, hence for regular simple geometry, it is best to create a coarse mesh that captures the geometry, that can then be refined (subdivided). First enter x,y coordinates of the nodes of the coarse mesh below.

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MECH3300/3302 COMPUTER TUTORIAL 2 Modelling 2D problems1. Plane strain crack modelThis model will be constructed in STRAND7. The dimensions are those of the test specimen used in the experiment in fracture mechanics. STRAND7 can import CAD geometry, but cannot create geometry, hence for regular simple geometry, it is best to create a coarse mesh that captures the geometry, that can then be refined (subdivided).First enter x,y coordinates of the nodes of the coarse mesh below.205 mm148 mm118 mm88 mm68 mm 48 mm36 mmy fixed beyond crack tip x and y fixed xPick Quad4 elements in Create, Element and join the nodes to create the coarse mesh. The mesh can then be refined using Tools, Subdivide, to create a finer mesh, such as that above. The mesh shown is too fine for the demonstration version of the program. Any location to be treated as a crack tip is further refined using the mesh grading tool (Grade Plates and Bricks) on the same tool menu. To replace an element by the subdivision selected, click near the two sides of the element to be given the finer mesh the sides shown cross-hatched on the menu in STRAND7.The mesh needs to be restrained to stop rigid body motion. First select Global, Load and Freedom Cases and pick the 2D plane case under Freedom Cases note that only x and y displacements are used as unknowns. We wish to fix displacement normal to the plane of symmetry ahe

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