Abstract
Crack opening displacements (COD) are calculated with the finite element method (FEM) under the conditions of plane strain and small scale yielding. In the case of small scale yielding, a small plastic zone is embedded in the elastic crack tip stress field. This chapter presents an experimental and FEM study on COD. CODs between the upper and lower crack surfaces under static tensile load were measured with the moire method. The moire measurements fell into the range where the FEM calculations and the elastic results coincide.
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