Test piece for determining I type fracture energy of compound propellant/coating layer bonding interface

Abstract

The invention discloses a test piece for determining I type fracture energy of a compound propellant / coating layer bonding interface. According to the test piece, a compound propellant layer and a coating layer are stuck by a sticking layer; the two ends of the compound propellant layer and the coating layer are aligned; one ends of the compound propellant layer and the coating layer are not stuck and a prefabricated crack is formed; an optical grating is stuck on the middle positions of the side faces of the compound propellant layer, the sticking layer and the coating layer; initial scales of the optical grating correspond to the tip of the prefabricated crack; supporting beams are stuck on corresponding faces of a bonding face of the compound propellant layer and the coating layer respectively; one ends of the supporting beams are aligned with one ends without the prefabricated cracks of the compound propellant layer, the sticking layer and the coating layer; the length of each supporting beam is greater than or equal to those of the compound propellant layer and the coating layer; loading blocks are fixedly arranged at one ends with the prefabricated cracks of the supporting beams on the compound propellant layer, the sticking layer and the coating layer. The test piece adopts the supporting beams so that the rigidity of the test piece is improved; the test piece is applicable to determining the I type fracture energy of a soft or flexible material combining assembly; the optical grating is adopted so as to record microscomic characteristics and crack propagation conditions of the tip of the crack in real time.

Description

technical field [0001] The invention belongs to the field of measuring the type I fracture energy, in particular to a composite propellant / coating layer adhesive interface type I fracture energy measuring specimen. Background technique [0002] Both the composite propellant and the coating are soft materials with excellent elastic properties. Regarding the determination of the fracture energy of soft materials, the relevant standards at home and abroad are all through peeling tests, such as T-peeling, 90° and 180° peeling tests, etc. For example, the standard BS EN ISO11339:2005.Adhesives----T-peel test for flexible-to-flexible bonded assemblies specifies the T-peel test method for flexible materials and flexible material bonded assemblies. However, Since the propellant is a particle-filled composite, the propellant will be damaged internally in the peel test before the bond interface fails, so the relevant peel test standards may not be very applicable. [0003] In the de...

AI Technical Summary

Problems solved by technology

However, this specimen and test method are not suitable for materials with a small stiffness-to-self-weight ratio, such as composite propellants and cladding

Because when they are used as beam arms in the sample, the ends will be deflected to a certain extent, which will affect the accuracy of the experiment.

Images