Discussion
Consider the following statements about global-local modelling:
1. The coarse model supplies displacements or forces to a refined submodel.
2. It gives detailed stresses without meshing the whole structure finely.
3. The submodel must be coarser than the global model.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 describe the method and its purpose. Statement 3 inverts the arrangement - the submodel must be very much finer than the global model, typically by a factor of ten or twenty, since detail in the critical region is the whole object. The coarse model supplies the displacements on the submodel’s cut boundaries, which must be placed well away from the region of interest.
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