PURPOSE:To enable accurate measurement of inherent strength in a circumferential direction, by pressing the non-compressive material being filled in a thin walled cylindrical specimen comprising an anisotropic material to allow uniform pressure to act on the inner wall of the specimen and loading tensile or compression load to the specimen in the circumferential direction thereof. CONSTITUTION:A thin walled cylindrical specimen 1 comprising an anisotropic material is held on a base plate without restricting both end parts thereof and a non-compressive material 4 such as water is allowed to fill the cylindrical specimen 1 through a flexible film 3. In the next step, a movable plate 5 is inserted into the cylindrical specimen 1 from the open end thereof. When load W is applied to the movable plate 5 by a loading apparatus, the internal pressure (P) of the non-compressive material 4 increases in proportion to load W and, therefore, the load W is increased until the cylindrical specimen 1 is destructed and tensile test load can be loaded to the cylindrical specimen 1 in the circumferential direction thereof. As a result, the strength of the cylindrical specimen 1 can be accurately measured.
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