Experimental device for axial compression experiments of plates

Abstract

The invention provides an experimental device for axial compression experiments of plates. The device comprises end plates, a clamping device, a locking device, an upper supporting rod and a lower supporting rod. During the experiments, section centroids of compressed faces and bottom faces of plate samples are overlapped with centers of end faces of the upper end plate and the lower end plate, the upper supporting rod is inserted into the lower supporting rod, the clamping device is adjusted, the locking device is tightened, and a clamping plate of the clamping device closely contacts with the plate samples. The requirements of plate samples with different heights and thicknesses can be met by adjusting the upper supporting rod, the lower supporting rod and the clamping device. The experimental device is simple to manufacture, convenient to operate and high in reusing rate and can be widely applied to the axial compression experiments of the plates, the plate samples can be vertically fixed, and constraint of the designed experimental device on ends of the plate samples cannot interfere in experimental results.

Description

technical field [0001] The invention belongs to the technical field of testing mechanical properties of materials, and relates to an experimental device for an axial compression test of a plate. The device can be used for fixing a plate test piece in the plate axial pressure test, preventing the test piece from being eccentrically compressed, and protecting the plate test piece at the same time ends, to prevent end buckling of plate specimens from occurring before global buckling. Background technique [0002] Plates made of steel, aluminum, glass, etc. are widely used in building structures and stress-bearing components of industrial products, such as glass composite columns that can be used in buildings. Due to the large height-thickness ratio of the plate, the mechanical properties of the plate are mainly affected by buckling when the plate is subjected to axial pressure. When the axial pressure reaches the critical point of buckling failure, the plate specimen will be un...

AI Technical Summary

Problems solved by technology

However, the axial compression test of the plate cannot be tested directly on the operating platform of the press like a test piece of ordinary shape, it needs a device to fix it

At present, there is no general-purpose device for the axial compression test of plates, and scholars only place simple restraint devices at the ends of plate specimens during the test.

Many studies have shown that the restraint device at the end of the plate specimen greatly affects the mechanical results of the axial compression test

For example: (1) If the effective stiffness of the restraint device is too large, the rotation constraint will be generated at the bottom of the specimen, which will affect the test results; (2) If the restraint device is not secure, the end of the plate specimen will buckle and fail before the whole , leading to test failure; (3) the restraint device cannot ensure that the axis of the plate specimen is vertical, which will cause eccentric compression damage to the plate specimen; (4) the height of the restraint device is too high to easily reduce the effect of buckling, resulting in invalid test results; (5) The restraint device cannot be applied to plate specimens of any height and thickness, resulting in low utilization of the experimental device and waste of resources

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