Abstract
A self-made fatigue testing machine was used to simulate the damage process of the insulator interface under working conditions and the damage degree is evaluated by the compressive shear test. The improved interface adhesion model reflects the interface debonding process under different fatigue loads by introducing the damage coefficient χ, migration coefficient α and the debonding coefficient μ. The relationship of fatigue loads and interface damage is established by the peeling force, the unit interface separation work and the peeling time. The test demonstrates that the interface damage near the bottom of the insulator is worse than that near the middle part. The result of this analysis will be beneficial in easily finding damaged places of the insulator, and so as to reduce the power breakdown.
Highlights
We combined the constitutive model of bonding interface proposed by Needleman. by means of theoretical analysis and compressive shear test, the peeling process of core rod/sheath bonding interface under the different fatigue conditions was analyzed and the change of residual bond strength of the interface was described with the unit area separation work and the peeling time
The coefficient χ changed more obviously on the specimen No 5, while the displacement coefficient α showed no obvious change, and still fluctuating around 0.1, which means the stress on the core rod/sheath interface near the bottom is greater and the interface damage is more serious
We have successfully modified cohesive interfacial damage constitutive model and used it to characterize the process of core rod/sheath interface of the composite insulators under the different swing amplitudes and twist angles
Summary
We combined the constitutive model of bonding interface proposed by Needleman. by means of theoretical analysis and compressive shear test, the peeling process of core rod/sheath bonding interface under the different fatigue conditions was analyzed and the change of residual bond strength of the interface was described with the unit area separation work and the peeling time. By means of theoretical analysis and compressive shear test, the peeling process of core rod/sheath bonding interface under the different fatigue conditions was analyzed and the change of residual bond strength of the interface was described with the unit area separation work and the peeling time. 2.1 Core rod/ sheath interface and parameters. FXBW4-110/100 suspension composite insulator which is used in 110kV transmission line, was selected as the test object. Under normal circumstances the interface between sheath and core rod should be tightly bonded. Due to the mechanical fatigue produced by selfweight of transmission line, swing and torsion under wind load [17,18], the interface of composite insulator could have air gaps and even crack.
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