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Verification Model

Click model or here to download a .zip with all Abaqus models discussed in this presentation. Verification Model. Purpose – To begin code/mesh verification for tools that will be used in the aggregation technique (the loop) Attributes – Elastic grain, E g , n g ;

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Verification Model

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  1. Click model or here to download a .zip with all Abaqus models discussed in this presentation Verification Model Purpose – To begin code/mesh verification for tools that will be used in the aggregation technique (the loop) Attributes – Elastic grain, Eg, ng; Elastic particle, Ep , np; Ep = 3 x Eg; ng = np; Quadratic tets and; 1% strain applied uniaxially Note – This follows the model used by Mei & Morris* for a semi-analytical stress-field solution for a hemispherical particle in an infinite half-space. 1% Applied Strain 2 mm 6 mm A RD TD ND * Mei, Z., and J. M. Morris. "Stress concentration due to a hemispherical surface inclusion." International Journal of Fracture 64 (1993): 43-61

  2. Mesh/Code Verification with Elastic Grain A Larger grain, relative to the particle, produces closer comparison (not shown here)

  3. UMAT – FEMLIB Comparison Verification Model Geometry (mm): Grain dimensions – 25 x 25 x 25 Particle aspect ratio – 11:3.5:3.5 (RD:ND:TD) FEAWD results coming soon…

  4. FE Model Setup/Sensitivity Study • For an initial sensitivity study and code development: • Is the model at the left geometrically correct. • If so, I need to know rough values for the model (D, H, B, a). • What control over the crystal orientation do we have (i.e. is crystal orientation random or precisely controlled)? • What computations for the prediction of CZM parameters have been done for slip on a plane in a single crystal? D Single Crystal H Surface Crack 2a B

  5. Next Steps Understand what Erin has implemented in the past for models involving CZMs Generate the “Sensitivity Model” and do another mesh verification study Implement Erin’s code (or better? from Wash-Paulino CZM model) and extend to include the placement of interface elements on slip planes Implement an optimization code from Prof. Wilkins Aquino Write scripts to parallelize the FE solving portion of the aggregation loop

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