A special fixture for impact testing of composite laminates that can apply pretension

Abstract

The invention discloses a special fixture for impact testing of composite material laminates capable of applying pre-tensioning force. It consists of a base, a pressing mechanism and a loading mechanism. The pressing mechanism is located on the upper surface of the base and is fixedly connected to the base by bolts. The loading mechanism is installed at the end of the base; the base provides support for each component, the composite laminate is placed in the rectangular groove of the base, the nut is tightened to tighten the double lug connector through the loading bolt, and the double lug connector is tightened by the pin to tighten the clamping block, the clamping The tight block is connected to the composite laminate through static friction, and the other end of the composite laminate is pressed and fixed by the pressure plate, and the tightening torque of the adjusting nut applies different pre-tension loads to the composite laminate. The special test fixture can not only ensure the stable clamping function of the composite material laminate during the impact test, but also change the magnitude of the pre-tension load by adjusting the tightening torque of the nut. The test fixture is simple in structure and reliable in action.

Description

technical field [0001] The invention belongs to the technical field of impact testing of composite material laminates, and in particular relates to a special fixture capable of applying a pre-tension load during the drop weight impact test of fiber-reinforced resin-based composite materials. Background technique [0002] Fiber-reinforced resin-based composites have high specific strength and specific stiffness, making them widely used in the fields of aviation, aerospace, navigation and automobile industries. The drop weight impact test of composite laminates is used to test the resistance of composite laminates to impact damage. [0003] The size of the impact test fixture is specified in the "Damage Resistance Test Standard for Fiber Reinforced Resin Matrix Composite Materials in Drop Weight Impact Test" (ASTM D7136 / D7136M-05) formulated by the American Society for Testing and Materials, but the standard gives A fixed clamp cannot preload the laminate during impact. Howe...

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies in the prior art and overcome the problems that the prestressed loading fixture cannot apply pretension and load asymmetry, the present invention proposes a special fixture for impact testing of composite material laminates that can apply pretension. Guarantee the stable clamping function of composite material laminates in the impact test, and can also apply a balanced pre-tension load at the same time, effectively solving the problem that the existing test device cannot accurately simulate the pre-stress in the actual engineering application due to the assembly or operation process

Images