J-integral Measurement of Mixed Mode Cracks of HTPB Propellant Based on Digital Image Correlation Method

doi:10.3969/j.issn.1000-1093.2019.02.008

Abstract

Abstract: In order to realize the deformation field and J-integral measurement of mixed mode crack tip, the hydroxyl-terminated polybutadiene (HTPB) propellant specimens with center-through mixed mode cracks were prefabricated, and the stretching of propellant specimens was tested. The deformation picture sequences of specimens with different angle cracks were obtained. The digital image correlation method (DIC) is used to obtain the displacement and strain field of specimen surface. The J-integral of the mixed mode crack tip is calculated using the J-integral theory and the deformation field obtained by DIC. The results are compared with the finite element results. The results show that the distribution characteristics of deformation field obtained by DIC are consistent with the results obtained by the finite element method. The J-integrals under different integral paths are conserved, which verifies that the digital image correlation method can be used to effectively calculate J-integrals. For the same tensile displacement, the J-integral of mixed mode cracks decreases with the increase in angle. The J-integral value changes little when the crack angle changes from 0° to 45°, and the J-integral value decreases obviously when the crack angle changes from 45° to 67.5°.Key

Key words: hydroxyl-terminatedpolybutadienepropellant, digitalimagecorrelation, mixedmodecrack, deformationfield, J-integral

CLC Number:

V435⁺.21

WANG Yang, LI Gaochun, WU Peng, YANG Ming, HAN Yongheng. J-integral Measurement of Mixed Mode Cracks of HTPB Propellant Based on Digital Image Correlation Method[J]. Acta Armamentarii, 2019, 40(2): 284-291.

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第40卷
第2期2019 年2月兵工学报ACTA
ARMAMENTARIIVol.40No.2Feb.2019

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