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基于 ABAQUS / Python 的三维混凝土骨料参数化建模

  • 2026-03-08 10:58:07
基于 ABAQUS / Python 的三维混凝土骨料参数化建模
基于 软件强大的二次开发能力本文 结合 语言的建模程序提出了一种基于八面 体生成凸多面体骨料的三维建模方法[]引入辅 助球来构造骨料基骨料的大小和位置由辅助球控 制辅助球半径即为骨料粒径然后对骨料基进行随 机延拓生成任意凸多面体骨料并根据海伦公式计 算骨料体积实现了对级配的精准控制
本文采用球体的内切多面体生成骨料模型并 以此为基础通过辅助球体方法生成凸多面体骨料为了获得较高的骨料含量需按照骨料粒径由大到 小的分级顺序逐个创建和放置骨料
网格划分是细观数值模型建立的关键合理的 网格密度可以更精确地模拟混凝土内部细观层面的 受力情况从而更好地反映其宏观力学性能此外网格划分还可以提高模拟的精度减少计算时间提 高模拟的效率由于多面体骨料颗粒形状随机观结构高度非结构化四面体网格能更好地模拟骨 料的真实形状同时为体现多面体骨料表面不规则 棱角处的应力集中本文采用四面体网格对骨料和 砂浆进行划分网格划分如图5 所示
基于辅助球体的方式产生凸多面体骨料的生成 算法流程如图 所示建模效果如图 所示在 种 不同骨料体积分数的情况下具体生成的骨料数量和分布如图 所示其中不同尺寸的多面体骨料分 别包括直径为 和 的骨料颗粒图 ()包含 个直径为 个直径为 和 个直径为 的骨料图 ()包含 个直 径为 个直径为 和 个直径为的骨料图 ()包含 个直径为 个 直径为个直径为 的骨料可以 看出该算法可以很好地模拟骨料的生成情况
算法具体流程为:
)随机确定多面体骨料的最大顶点数在混凝 土内部生成辅助球的坐标信息并在辅助球表面随 机生成 个初始点
)插入 个新的顶点需控制由多面体骨料组 成的插入点之间的边长即新生成的边长需大于如果新插入的顶点超出指定范围则返回重新 生成
)重复步骤 )直到插入集合的所有顶点满足 个数要求
)遍历所有已生成的顶点顶点与其余任选 个顶点形成三角面判断剩余凸体的点是否全部位 于三角面的同一侧否则舍去重新进入循环
)满足上述条件的顶点可与凸多面体上可见三 角形的顶点连接形成新边
)随机生成下 个辅助球球心坐标信息并判 断其与已生成的辅助球是否存在干涉在辅助球表 面随机生成初始点返回步骤 )直到所有骨料个 数达到级配要求
结语
本文基于 脚本对 软件进行了 二次开发处理基于空间八面体骨料模型建立了混 凝土的细观有限元模型发挥了 二次开发 在复杂构件参数化方面的强大优势通过研究发:)凸多面体骨料模型更加符合工程实际并且向 量法判定随机多面体凹凸性简单易行同时采用海 伦公式计算凸多面体体积可实现对骨料体积分数精 确控制)该方法建模效率高可满足未来各类级配 的多面体混凝土骨料细观模型建模为混凝土复合 材料的损伤研究提供建模支持
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  1. CONNECT:[ UseTime:0.000911s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000793s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000338s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000545s ]
  8. SELECT * FROM `article` WHERE `id` = 478862 LIMIT 1 [ RunTime:0.000435s ]
  9. UPDATE `article` SET `lasttime` = 1774625907 WHERE `id` = 478862 [ RunTime:0.005924s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000230s ]
  11. SELECT * FROM `article` WHERE `id` < 478862 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000419s ]
  12. SELECT * FROM `article` WHERE `id` > 478862 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001712s ]
  13. SELECT * FROM `article` WHERE `id` < 478862 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004074s ]
  14. SELECT * FROM `article` WHERE `id` < 478862 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000674s ]
  15. SELECT * FROM `article` WHERE `id` < 478862 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000759s ]
0.152237s