Explosive column stress measurement device under low-speed hammer-dropping impact loading

Abstract

The invention discloses an explosive column stress measurement device under low-speed hammer-dropping impact loading, aiming at solving the problems that the current measurement device measures force indirectly, a sensor cannot be calibrated secondarily after measurement and the operation in the testing process is complex. The explosive column stress measurement device is composed of a strike rod, a stressed cap, an upper striking column, a sample pipe, a sample, a lower striking column, a pressure sensor and a striking anvil. The explosive column stress measurement device can directly measure the sample stress and has a simple operation process, and the sensor can be calibrated after measurement. The explosive column stress measurement device can measure the stress of the explosive column under low-speed hammer-dropping impact loading, and is both suitable for fragile explosive columns and viscoelastic fragile explosive columns.

Description

technical field [0001] The invention belongs to the technical field of safety performance evaluation of propellants and explosives, and relates to a device for measuring the stress of a powder column under impact loading by a low-speed drop hammer. Background technique [0002] Measuring the stress change process of the grain under impact loading by the falling weight is of great significance to the study of the reaction state of the sample and the insensitivity mechanism of the grain. [0003] At present, the test devices for measuring the stress change of the sample during the drop hammer impact process at home and abroad use strain gauges as sensors. The measuring device is mainly composed of a sample casing, a shot column, a sample, a standard steel block, a strain gauge and other components. The standard steel block is placed under the bottom stud, where the cross section of the stud is circular, the cross section of the standard steel block is hexagonal, and the side ...

AI Technical Summary

Problems solved by technology

The stress of the grain impact process measured by this device is a calculated value, calculated according to the elastic modulus of the material; the stress on the standard steel block is inconsistent with the actual force direction of the grain; the cross-sectional shape and shape of the standard steel block and the grain Dimensions are inconsistent, and the force on the end face of the standard steel block is uneven, which affects the pressure measurement; the measurement result has a lot to do with the operator's operating level, such as the position of the strain gauge, the choice of adhesive, the direction of the paste, the curing technology after the patch, etc. , the sensor cannot be re-calibrated after the test, and the data reliability is low

The above-mentioned test device cannot accurately and reliably measure the stress change of the grain during the impact of the low-speed drop hammer

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