PSI - Issue 13

Yuki Nishizono et al. / Procedia Structural Integrity 13 (2018) 1817–1827 —‹ ‹•Š‹œ‘‘ Ȁ –”—…–—”ƒŽ –‡‰”‹–› ”‘…‡†‹ƒ ͲͲ ሺʹͲͳͺሻ ͲͲͲ – ͲͲͲ ͹ displacement in Y direction to the analytical rigid. The press notch processing is also controlled by applying a forced displacement in Y direction to another analytical rigid at room temperature. The element type is hexahedral primary element, and the elements along crack propagation plane are the complete integral elements and the other elements are the reduced integral elements. The calculation method is the HHT method (Hilber et al., 1977) and the control parameter is “Transient Fidelity ( = −0.41421, = 0.5, = 0.91421 )” (Abaqus Theory Guide). The crack velocity history is assumed to be constant at 100, 200, 300, 400, 500 m/sec and the crack front shape is assumed to be flat. Figure 8 shows the d transitions of the preliminary experiments calculated by FEA. For all analysis results, the authors confirmed that d decreases monotonically regardless of crack velocity. Figure 9 shows results of [ d ] critical and ESSO tests. [ d ] critical obtained by preliminary experiments, indicating strong Arrhenius type temperature dependence and these results have high extrapolated correlation with those by ESSO tests. 1823

Fig. 7. Generals of FEM model simulating the preliminary experiments.

Specimen No.1 Specimen No.10 Fig. 8. d transitions of the preliminary experiments calculated by FEA.