当前位置:首页>python>告别重复劳动!Abaqus Python 自动化建模:手把手教你实现“分层建模”与“节点自动融合”内置函数 mergeNodes

告别重复劳动!Abaqus Python 自动化建模:手把手教你实现“分层建模”与“节点自动融合”内置函数 mergeNodes

  • 2026-02-05 00:55:09
告别重复劳动!Abaqus Python 自动化建模:手把手教你实现“分层建模”与“节点自动融合”内置函数 mergeNodes

在有限元分析(FEA)的日常工作中,我们经常会遇到需要对模型进行“分层”处理的情况——无论是为了模拟复合材料、定义不同的网格密度,还是为了后续的断裂力学分析。

如果仅仅靠 GUI 界面点点点,效率低且容易出错。今天,我们将深度解析一段高效的 Abaqus Python 脚本,看它如何优雅地完成从底层节点构建到结果自动可视化的全流程。


💡 为什么选择“分层建模”方案?

在本次演示的脚本中,我们并没有直接创建一个完整的矩形,而是将区域划分为 Lower Region 和 Upper Region。这种做法的优势在于:

  • 局部精确控制:可以分别为不同区域设置不同的网格流向和密度。

  • 材料差异化:方便后续为不同层指派不同的材料属性。

  • 参数化极强:只需修改几个参数,整个模型的几何和网格瞬间完成重构。

🛠️ 核心参数概览

程序通过参数化驱动,所有几何与网格指标均可一键修改:

参数
含义
数值
L / H
模型长度与总高度
100.0 / 20.0 (mm)
H_split
分层位置(中线)
10.0 (mm)
nx
X方向单元数量
20
ny1 / ny2
下/上区域 Y方向单元数
2 / 2
Material
材料类型
钢材 (E=210GPa, ν=0.3)
Elem Type
单元类型
CPS4R (平面应力减缩积分)

from abaqus import *from abaqusConstants import *import materialimport sectionimport regionToolsetimport displayGroupMdbToolset as dgmimport partimport assemblyimport stepimport interactionimport loadimport meshimport optimizationimport jobimport sketchimport visualizationimport xyPlotimport displayGroupOdbToolset as dgoimport connectorBehaviorimport sysimport osL = 100.0H = 20.0H_split = H / 2.0nx = 20ny1 = 2ny2 = 2dx = L / nxdy1 = H_split / ny1dy2 = H_split / ny2total_force = 1000.0model_name = 'Automated_Plane_Stress_Split'if model_name in mdb.models:   del mdb.models[model_name]my_model = mdb.Model(name=model_name)my_part = my_model.Part(   name='Plate',   dimensionality=TWO_D_PLANAR,   type=DEFORMABLE_BODY)nodes_region1 = []for j in range(ny1 + 1):   for i in range(nx + 1):       x = i * dx       y = j * dy1       n = my_part.Node(coordinates=(x, y, 0.0))       nodes_region1.append(n)nodes_region2 = []for j in range(ny2 + 1):   for i in range(nx + 1):       x = i * dx       y = H_split + j * dy2       n = my_part.Node(coordinates=(x, y, 0.0))       nodes_region2.append(n)all_part_nodes = my_part.nodesnode_dict = {}tolerance = 1e-6for node in all_part_nodes:   coord_key = (       round(node.coordinates[0] / tolerance) * tolerance,       round(node.coordinates[1] / tolerance) * tolerance,       round(node.coordinates[2] / tolerance) * tolerance   )   if coord_key not in node_dict:       node_dict[coord_key] = node.labelnode_merge_map = {}for node in all_part_nodes:   coord_key = (       round(node.coordinates[0] / tolerance) * tolerance,       round(node.coordinates[1] / tolerance) * tolerance,       round(node.coordinates[2] / tolerance) * tolerance   )   node_merge_map[node.label] = node_dict[coord_key]duplicate_count = len(all_part_nodes) - len(node_dict)elements_region1 = []for j in range(ny1):   for i in range(nx):       n1_local = j * (nx + 1) + i       n2_local = j * (nx + 1) + (i + 1)       n3_local = (j + 1) * (nx + 1) + (i + 1)       n4_local = (j + 1) * (nx + 1) + i       node1 = nodes_region1[n1_local]       node2 = nodes_region1[n2_local]       node3 = nodes_region1[n3_local]       node4 = nodes_region1[n4_local]       elem = my_part.Element(           nodes=(node1, node2, node3, node4),           elemShape=QUAD4       )       elements_region1.append(elem)elements_region2 = []for j in range(ny2):   for i in range(nx):       n1_local = j * (nx + 1) + i       n2_local = j * (nx + 1) + (i + 1)       n3_local = (j + 1) * (nx + 1) + (i + 1)       n4_local = (j + 1) * (nx + 1) + i       node1 = nodes_region2[n1_local]       node2 = nodes_region2[n2_local]       node3 = nodes_region2[n3_local]       node4 = nodes_region2[n4_local]       elem = my_part.Element(           nodes=(node1, node2, node3, node4),           elemShape=QUAD4       )       elements_region2.append(elem)all_node_labels = [n.label for n in my_part.nodes]my_part.Set(   nodes=my_part.nodes.sequenceFromLabels(all_node_labels),   name='All-Nodes')my_part.mergeNodes(   nodes=my_part.sets['All-Nodes'],   tolerance=tolerance)mat = my_model.Material(name='Steel')mat.Elastic(table=((210000.00.3), ))my_model.HomogeneousSolidSection(   name='Sec',   material='Steel',   thickness=1.0)p_elems = my_part.elementsmy_part.Set(elements=p_elems, name='All-E')my_part.SectionAssignment(   region=my_part.sets['All-E'],   sectionName='Sec')my_part.setElementType(   regions=my_part.sets['All-E'],   elemTypes=(mesh.ElemType(elemCode=CPS4R),))all_nodes_final = my_part.nodesleft_labels = [n.label for n in all_nodes_final if abs(n.coordinates[0] - 0.0) < tolerance]my_part.Set(   nodes=my_part.nodes.sequenceFromLabels(left_labels),   name='Set-Left')right_labels = [n.label for n in all_nodes_final if abs(n.coordinates[0] - L) < tolerance]my_part.Set(   nodes=my_part.nodes.sequenceFromLabels(right_labels),   name='Set-Right')my_asm = my_model.rootAssemblyinst = my_asm.Instance(name='Inst', part=my_part, dependent=ON)my_model.StaticStep(name='Step-1', previous='Initial')my_model.EncastreBC(   name='Fix',   createStepName='Initial',   region=inst.sets['Set-Left'])f_per_node = total_force / len(right_labels)my_model.ConcentratedForce(   name='Pull',   createStepName='Step-1',   region=inst.sets['Set-Right'],   cf1=f_per_node)job_name = 'Analysis_Task_Split'if job_name in mdb.jobs:   del mdb.jobs[job_name]my_job = mdb.Job(   name=job_name,   model=model_name,   type=ANALYSIS,   description='Automated Plane Stress Analysis - Split Domain')my_job.submit()my_job.waitForCompletion()odb_path = job_name + '.odb'my_odb = session.openOdb(name=odb_path)vp = session.viewports['Viewport: 1']vp.setValues(displayedObject=my_odb)vp.odbDisplay.setPrimaryVariable(   variableLabel='S',   outputPosition=INTEGRATION_POINT,   refinement=(INVARIANT, 'Mises'))vp.odbDisplay.display.setValues(plotState=(CONTOURS_ON_DEF, ))vp.odbDisplay.commonOptions.setValues(deformationScaling=AUTO)

🔍 脚本技术亮点解析

1. 纯手动节点构建 (Orphan Mesh) 🏗️

脚本跳过了传统的 Sketch 绘图,直接利用 my_part.Node 在空间中通过循环生成节点坐标。这种“底层开发”模式赋予了仿真工程师对模型最绝对的控制权。

2. 巧妙的节点融合技术 (Node Merge) 🔗

这是本程序的灵魂所在。由于上下两个区域分别生成节点,在交界处(Y =H_split)会产生重叠节点。脚本采用了双重保险:

  • 逻辑预判:通过 Python 字典记录坐标,识别冗余节点。

  • Abaqus 内置融合:调用 my_part.mergeNodes API,确保交界处位移连续,避免模型“裂开”。

3. 全自动化分析流 🌊

从创建材料、指派截面、定义边界条件(左侧固定,右侧拉伸),到最后的 Job 提交与 ODB 结果自动打开,真正实现了 “一键仿真”


📊 仿真结果呈现

程序运行结束后,会自动进入后处理模块并执行以下操作:

  • 自动打开 .odb 文件。

  • 将主变量切换为 Mises 应力

  • 自动调整变形缩放系数(Auto-scale)。

  • 在 Viewport 中直接呈现带云图的变形效果。


📝 结语

通过 Python 驱动 Abaqus,不仅是提升效率的手段,更是通往数字化设计(Generative Design)大规模参数化扫描的必经之路。

这段代码展示了一个完整的自动化闭环:

  1. 输入:几何与物理参数

  2. 处理:底层网格构建与拓扑修复

  3. 求解:自动计算

  4. 输出:可视化云图与分析报告


希望这篇推文的思路能给你带来启发!如果你对这段脚本的某个特定函数(如 sequenceFromLabels 或 mergeNodes 的容差设置)感兴趣,欢迎在评论区留言或直接私信我交流。

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  1. CONNECT:[ UseTime:0.000582s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000624s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001998s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000677s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000602s ]
  6. SELECT * FROM `set` [ RunTime:0.001629s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000623s ]
  8. SELECT * FROM `article` WHERE `id` = 473049 LIMIT 1 [ RunTime:0.015325s ]
  9. UPDATE `article` SET `lasttime` = 1770448578 WHERE `id` = 473049 [ RunTime:0.004964s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000295s ]
  11. SELECT * FROM `article` WHERE `id` < 473049 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000854s ]
  12. SELECT * FROM `article` WHERE `id` > 473049 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006583s ]
  13. SELECT * FROM `article` WHERE `id` < 473049 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.022775s ]
  14. SELECT * FROM `article` WHERE `id` < 473049 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.027404s ]
  15. SELECT * FROM `article` WHERE `id` < 473049 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005086s ]
0.163459s