METHOD AND DEVICE FOR DYNAMIC BRAKAGE FATIGUE TEST OF BRITTLE MATERIAL

摘要

PURPOSE:To enable an accurate measurement by placing a compressive load on a rectangular test-piece, which is cracked previously, from one side along its test section, along an operation line which is parallel to the center axis and eccentric to the opposite side of the cracking within the section of the test-piece. CONSTITUTION:The test-piece 1 which is a rectangle whose length/width ratio is about 2 and has the cracking 4 made at one side previously is clamped between an upper and lower anvil 2 and a mounted on an electricity-hydraulic pressure servo type testing machine and the compressive load P is placed. Each anvil 2 has a hollow part 3 constituting a fulcrum of elasticity at an intermediate part, and the operation line of the load passes its center. The test-piece 1 is fixed eccentrically to one side so that the load line is ep away from the opposite side of the cracking. Further, strain gauges 5 and 6 are mounted on the cracking side of the test-piece 1 and its opposite side and strain is measured only when the load is placed. Further, stain gauges 7 are stuck on both surfaces of the hollow part 3 constituting the fulcrum of elasticity of the anvil 2 and the bending quantity of the hollow part, i.e. the tilt angle of both end surfaces of the test-piece 1 can be measured from the difference in strain between the gauges.