Drop weight tear test system and method thereof

Abstract

The invention discloses a drop weight tear test system and a method thereof, wherein the system comprises a mainframe, a hammering device, a lifting and releasing device and an energy testing and controlling device. The energy testing and controlling device is arranged on the mainframe and the hammering device, for acquiring hammering energy of the hammering device. The hammering device comprises a swing rod, a hammerhead and an impact blade, one end of the swing rod is fixedly connected with a central shaft of the mainframe, the other end is fixedly connected with the hammerhead, the impact blade is fixed on the central position on the internal side of the top of the hammerhead, and a sample anvil block is arranged on a tangential position of a hammerhead movement track. The method comprises: placing a sample on the sample anvil block; once horizontally punching and breaking the sample with the hammerhead from the back side of a sample gap; and testing force-time and displacement-time curves in a punching and breaking process by the energy testing and controlling device, and calculating and displaying drop weight tear energy of the sample. The system and the method implement large-scope measurement of breaking-resistant energy of pipeline steel or a steel pipe, and have advantages of low detection energy consumption, accurate test result and simple test.

Description

technical field [0001] The invention relates to the technical field of metal material testing, in particular to a drop weight tearing test system and a method thereof. Background technique [0002] With the rapid growth of the world's demand for energy, the construction of oil and gas pipelines tends to use large-diameter, high-strength pipeline steel and steel pipes to ensure that the pipelines are in service and run under high pressure. In this case, how to control the ductile crack propagation of pipelines It is necessary to consider the safety factor. Therefore, it is necessary to predict and control the crack growth resistance of the material, that is, the crack arrest toughness, in the design of pipeline fracture resistance. Pipeline crack arrest prediction methods are usually based on Charpy absorbed energy (CVN), falling weight tear (DWTT) absorbed energy and full-scale burst tests. The CVN value test results of pipeline steel and steel pipe are generally not more ...

AI Technical Summary

Problems solved by technology

and D p Accurate testing is directly related to the sample size and notch size and type, but in the current standards such as API RP 5L3, GB/T 8363, AS

Images