摘要
用粘弹性断裂力学的方法分析了三维板状试样固体推进剂材料的裂纹扩展特性，建立了三维固体推进剂材料的有限元模型，用最大能量释放率准则模拟了试样承受单向拉伸栽荷时的裂纹扩展方向．在数值模拟中考虑了材料非线性及裂尖单元奇异性．通过有限元分析，得出了固体推进剂单向拉伸时裂纹扩展方向．结果表明，裂纹在与初始预制裂纹面成约20°～30°的角度方向传播，计算结果与试验结果吻合较好．
Crack growth character of solid propellant in 3D plate was analyzed by viscoelastic fracture mechanical method. The 3D finite element model of solid propellant was established, and the crack growth orientations of the sample under simple tension was simulated using the maximum energy release rate criterion. The nonlinear property and crack tip finite element singularities of solid propellant were considered in the model. The crack growth orientations under simple tension was gained by finite element analysis. The results show that the crack growth orientations grow about 20°-30° with initial pre-craek plane, and the calculation results coincide with experimental results.
出处
《弹道学报》
CSCD
北大核心
2008年第3期24-28,共5页
Journal of Ballistics
关键词
固体推进剂
粘弹性
有限元模型
奇异性
非线性
solid propellant
viscoelasticity
finite element model
singularity
nonlinearity
