Study on parameter inversion of the bonding interface of a propellant/liner/insulating layer at the meso scale

DOI:	10.11809/bqzbgcxb2023.05.008
Keywords:	propellant/liner/insulating bonding interface; interface constitutive relation; inversion recognition; digital image correlation technology; cohesive force model
Abstract:	In view of the problem that the empirical method cannot guarantee the accuracy of the cohesion model of the bonding interface (propellant/liner/insulation layer) at the meso scale, this paper records the deformation and failure of the bonding specimen during the tensile process through an in situ tensile experiment of scanning electron microscope (SEM). By combining digital image related technology with the invert identification method of Hooke Jeeves optimization algorithm, the parameters of the bilinear cohesive force model used in the interface are invert identified. The damage factor curve of the interface unit is combined with the experimental results to analyze the interface damage. The results show that when the loading rate is 1.2 mm·min -1 , the interface stiffness, maximum nominal stress and interface failure displacement of the model are 6.40 MPa·mm -1 , 0.72 MPa and 1.80 mm respectively. When ε is 8% or 18%, the average error of the simulated and measured Region of Interest (ROI) displacement (Ux) is 7.1% or 4.9% respectively. The curve of damage factors can well characterize the damage process of the interface. The accuracy of the inversion identification method is high, which provides a new method for accurately obtaining the interface model parameters of bonding structures at the meso scale.
Issue:	Vol. 44 No. 5 (2023)
Published:	2023-05-28
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