Analysis of Interlayer Stress State in Thin-Walled Lined Regenerative Composite Pipes under Pulse Load
To thoroughly investigate the impact of radial impulse force on the interlaminar stress of thin-walled lined composite pipes,this paper conducts modal testing on composite plates made by bonding X52N steel plates and fiberglass plates based on the established interlaminar interaction constitutive relationship.The experimental re-sults are compared with finite element simulation outcomes,validating the feasibility of the adhesive layer constitu-tive model in finite element simulations.The finite element analysis model of thin-walled lined composite pipe is established to study the ratio of the thickness of the outer base pipe to the thickness of the lining layer and the influ-ence of the bond strength on the stress state of the interlayer under the action of radial pulse force.The results show that with the increase of layer thickness ratio,the change of interlayer stress is more significant,but the influence of bond strength is relatively small.Within a certain range of layer thickness ratios,the supporting effect of the outer layer pipe can effectively reduce interlaminar stress.However,the thickness of the outer layer pipe should not be ex-cessively increased,as an overly thick outer layer pipe would add mass and stiffness,thereby intensifying the con-straint on the inner lining layer and ultimately leading to an increase in interlaminar stress.
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