Drop hammer impact clamp with variable sample size, variable impact point and variable boundary conditions

Abstract

The invention discloses a drop hammer impact clamp with variable sample size, variable impact point and variable boundary conditions, and belongs to the field of impact test clamps. Comprising an upper base, a position sliding block, a boundary sliding block, a T-shaped sliding block, a supporting column and a base. The four upper seats are respectively fixed right above the base through the supporting columns and are positioned at four corners of the space rectangle; the base is used for being connected with a drop hammer impact testing machine; guide rails are arranged on two adjacent side surfaces of the inner side of the upper seat along the horizontal direction; the four position sliding blocks are respectively arranged on the guide rails of the four upper seats through the sliding rails to form edges of a space rectangle; the four boundary sliding blocks are installed on the guide rails of the four position sliding blocks through sliding rails correspondingly. The T-shaped sliding block is installed in the T-shaped guide rail of the boundary sliding block and can slide in the T-shaped guide rail, and a threaded hole is formed in the top of the T-shaped sliding block and matched with a bolt to press and position the edge of the sample. Impact of samples with the same size under the same position and different boundary conditions and impact of samples with different positions and different boundary conditions can be achieved.

Description

technical field [0001] The invention belongs to the field of impact test fixtures, in particular to a dropping weight impact fixture with variable sample size, variable impact point and variable boundary conditions. Background technique [0002] Composite materials have been widely used in the fields of aviation, spaceflight, ships and automobiles because of their excellent performance. In actual use, composite laminates and composite sandwich structures are easily damaged under low-velocity impact loads. In order to evaluate the impact resistance of composite laminates and composite sandwich structures, study the impact response of structures and materials under different low-speed impact loads and determine their damage tolerance, drop weight impact tests are usually required. [0003] The current impact test fixtures are usually designed according to the standard sample size (150mm×100mm) stipulated in ASTM D7136 and other standards. When the sample size changes, differe...

AI Technical Summary

Problems solved by technology

For example: Invention patent CN112504824A discloses an impact-resistant fixture for composite laminates with variable thickness. A non-single impact point impact test fixture realizes the impact of different positions of the sample, but it cannot be used for impact tests of different size samples and different boundary conditions; the invention CN110864981A discloses a modular non-single impact position The point impact fixture realizes the variable impact point impact and can impact samples of different sizes at the same time, but its size changing function must be realized by customizing the support plate 7, that is, samples of different sizes need to customize different support plates 7, which undoubtedly increases reduces the test cost, and cannot change the boundary conditions of the impact

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