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2 results about "Compact tension specimen" patented technology
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A compact tension specimen is a notched sample and is a standard specimen in accordance with ASTM and ISO standards. The purpose of using a notched sample is to create a fatigue crack by cycling the sample to maximum and minimum loads. The fatigue crack will begin on the point of the notch and extend through the sample, the fatigue crack is a good representation of 'real life' inconsistencies which are introduced to a material due to processing techniques or welding. CT specimens are used extensively in the area of fracture mechanics and corrosion testing, in order to establish fracture toughness and fatigue crack growth data for a material.
A compact tensile specimen crack length in-situ monitoring system for harsh corrosive environments and methods of use thereof
ActiveCN115930761BWeather/light/corrosion resistanceNuclear energy generationMonitoring systemStructural engineering
The present application relates to the field of crack propagation test of stress corrosion, corrosion fatigue and fracture toughness, and particularly relates to a system for in-situ monitoring of crack length of compact tension specimen in harsh corrosion environment and a use method thereof. Two short sides of a T-shaped connecting assembly are fixed at both sides of a center crack opening of a CT specimen, a long side head of the T-shaped connecting assembly is inserted into a through hole on one side of a turning block, a displacement transmission rod is clamped by a separated ohmic clamp on the other side of the turning block, an inductive core on the upper end of the displacement transmission rod is threadedly connected to a LVDT inserted into a high-temperature and high-pressure kettle cover, a spacer is threadedly and tightly sealed on the high-temperature and high-pressure kettle cover, a water cooling jacket is arranged outside the spacer, the LVDT is connected to the upper end of the spacer through a thread and a sealing washer, and the LVDT is connected to a data collector. The present application uses the flexibility method to obtain a relationship expression between the opening displacement of the crack opening of the CT specimen and the crack length, so that the crack length of the CT specimen in the harsh corrosion environment can be monitored in-situ.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI +3
Method for efficiently determining constant load fracture toughness of hydrogen transmission pipeline material in high-pressure hydrogen environment
The present application relates to hydrogen energy transportation and material mechanical property testing technical field, specifically to a kind of high-pressure hydrogen environment hydrogen transportation pipeline material constant load fracture toughness efficient determination method, by precasting the crack depth corresponding to different stress intensity factor level in two compact tension specimens respectively, and using orifice plate to mechanically connect the two, make two specimens simultaneously bear the same constant tensile load in high-pressure hydrogen environment, and after the fracture of any specimen, load can still be stably transmitted to another specimen, so that the crack propagation response data under two different crack depths in single constant load test is simultaneously obtained.The present application effectively utilizes the test time resources, and makes the test efficiency more than doubled.
Owner:SHAANXI PROVINCIAL NATURAL GAS