レーザスペックルひずみ計測法を用いた疲労き裂先端開口荷重の測定

概要

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A laser speckle strain gauge with a single laser beam and a double CCD sensor was made on the basis of the method shown in the literature. The measuring method for the strain which represents the crack opening displacement(COD) of the point irradiated the laser striding over the crack was shown. The decision method for the fatigue crack tip opening load from the relation curve between the load and the strain obtained by the above method was also shown on the basis of a fracture mechanics study. The relation between the fatigue crack propagation rate da/dn and the effective stress intensity factor range divided by Young's modulus ΛK_<eff>/E, which is calculated on the basis of the COD obtained by using laser speckle gauge, almost agreed with the relation between the da/dn and ΛK_<eff>/E based on the strain obtained by using strain gauge. This means that the strain measurement method using the laser speckle gauge and the decision method for the crack tip opening load using the strain are appropriate.
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