Full field study of strain distribution near the crack tip in the fracture of solid propellants via large strain digital image correlation and optical microscopy
开发了一种全场方法，通过数字图像相关和光学显微镜可视化固体推进剂断裂过程中裂纹尖端附近的大应变分布，解决了大变形下算法收敛问题。
A full field method for visualizing deformation around the crack tip in a fracture process with large strains is developed. A digital image correlation program (DIC) is used to incrementally compute strains and displacements between two consecutive images of a deformation process. Values of strain and displacements for consecutive deformations are added, this way solving convergence problems in the DIC algorithm when large deformations are investigated. The method developed is used to investigate the strain distribution within 1 mm of the crack tip in a particulate composite solid (propellant) using microscopic visualization of the deformation process.