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建立了固体推进剂/衬层界面裂纹的界面层有限元模型,该模型将界面层划分成3个区域,每一区域内采用特定函数表示材料初始弹性模量的分布。应用软件ABAQUS划分网格并采用子程序USDFLD定义界面层内梯度材料的初始模量,计算得到了法向和剪切位移加载下的应力应变场和应力强度因子。计算结果表明,界面贮存时间延长时,裂纹尖端附近整体应力及应力强度因子明显减小,而应变最大值略有增大。该模型的建立及计算结果对求解固体推进剂/衬层界面裂纹问题有一定的工程意义。
A finite element model of interfacial layer between solid propellant and liner was established. The interface layer was divided into three regions, and the distribution of the initial elastic modulus of each material was expressed in each region. The application software ABAQUS divides the grid and uses the subroutine USDFLD to define the initial modulus of the gradient material in the interface layer. The stress and strain field and stress intensity factor under normal and shear displacement loads are calculated. The calculation results show that the overall stress and stress intensity factor near the crack tip decrease obviously when the interface storage time is prolonged, while the maximum strain increases slightly. The establishment of the model and the calculation results have certain engineering significance for solving the problem of solid propellants / lining interface cracks.