| 摘要 |
PURPOSE:To measure exactly a stress of an object by forming slits of one pair or more on the surface of the object, and estimating a stress state from a correlation of a depth of the slit and a release distortion. CONSTITUTION:On the surface of an object 1, slits 2, 2 are formed at a prescribed interval, and formed by increasing a depth of the slits 2, 2 successively to about 1:0.4 against an interval between the slits. Also, a strain gauge 3 is stuck to the surface of a concrete block 1 placed between the slits 2, 2. In this state, pressure is applied in advance by a pressure device 8, the slits 2, 2 are deepened successively from a condition of depth ''0'' of the slits 2, 2, and on all such occasions, a distortion is measured by the strain gauge 3, and also a stress state which exists already in the object 1 is estimated from a correlation of a depth of the slits 2, 2 of this time and a release distortion. |
