{'fraction_non_alphanumeric': 0.01576182136602452, 'fraction_numerical': 0.0035026269702276708, 'mean_word_length': 5.606936416184971, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Optimal design and modeling of 3D variable-density lattice structures

As a kind of novel porous structure with high strength relative to low mass, lattice structure infilling can attain a lightweight structure while maintaining the high specific mechanical properties in the 3D solid structures. Focusing on the deficiency of the non-optimized macro-material distribution in the traditional lattice infilling, a design and modeling method of variable-density 3D lattice structures was proposed. With a three-point bending cube structure as the design object, type and sizes of lattices were specified beforehand by mechanical analysis. Considering the manufacturability, the cube was 3D topology-optimized and the density results were mapped to the relative density distribution matrix of lattice cells. The rapid and automatic modeling of variable-density lattice structures was realized with the parametric assembly of lattice components. The simulation results show that the mechanical performance of variable-density lattice structures is better than traditional uniform structures and the efficiency of the proposed method is validated.