User-defined element subroutines (UEL and VUEL) in Fortran are developed in ABAQUS, to implement the Scaled Boundary Finite Element Method (SBFEM), for general static and elastodynamic stress analyses of solids. The purposes are twofold: to increase the ease-of-use and acceptability of this relatively new numerical method; and to combine advantages of both the SBFEM and ABAQUS, namely, the former's semi-analytical solutions and flexibility in domain discretization, and the latter's powerful linear and nonlinear solvers and pre/post-processing modules, for modelling complicated problems with higher accuracy and fewer degrees of freedom than the traditional FEM. Using the developed UEL and VUEL, a few 2D and 3D problems, including homogeneous solids with and without cracks, composites with inclusions of random shapes, XCT-image converted concrete mesoscale models, are simulated. The results are compared favourably with FEM simulations in terms of accuracy and degrees of freedom.

在ABAQUS中开发了Fortran中的用户定义元素子例程（UEL和VUEL），以实现比例边界有限元方法（SBFEM），用于固体的一般静应力和弹性力学应力分析。目的是双重的：增加这种相对新的数值方法的易用性和可接受性；并结合SBFEM和ABAQUS的优势，即前者的半解析解决方案和域离散化的灵活性，以及​​后者强大的线性和非线性求解器以及预处理/后处理模块，可以更高精度，更少地建模复杂的问题自由度比传统的有限元法高。使用开发的UEL和VUEL，可以解决一些2D和3D问题，包括带有和不带有裂纹的均质实体，包含随机形状的复合材料，模拟了XCT图像转换的混凝土中尺度模型。在准确性和自由度方面，将结果与FEM仿真进行了比较。