摘要
为了在保证计算精度的前提下提高机织复合材料的建模效率,本文同时建立了嵌入式约束和绑定约束的平面机织复合材料有限元模型。采用渐进损伤分析的有限元方法研究了两种模型的应变-应力曲线、应力分布、失效扩展规律。对比分析的结果表明:嵌入式约束模型可以得到与绑定约束模型接近的仿真效果;嵌入式约束模型通过不同的预处理方式,可以得到不同的模拟精度。将与纤维束有空间交叉的基体单元性能进行合适的折减能有效提高强度模拟精度。除此之外,本文给出了平面机织复合材料纱线轨迹自动确定方法,通过编程处理可以进一步提高建模效率。
In order to improve the modeling efficiency of woven composites under the premise of ensuring calculation accuracy,a finite element model of planar woven composites with embedded constraints and tie constraints is established in this paper.The strain-stress curve,stress distribution and failure propagation of the two models were studied by finite element method of progressive damage analysis.The results of the comparative analysis show that the embedded constraint model can obtain simulation results close to the tie model.The embedded constraints model can obtain different simulation accuracy through different preprocessing methods.Appropriate reduction of the properties of the matrix elements that have spatial intersections with fiber bundles can effectively improve the strength simulation accuracy.In addition,this paper presents a method for automatically determining the yarn trajectory of planar woven composites,which can further improve the modeling efficiency through programming.
作者
王平安
WANG Ping’an(NO.38 Research Institute of CETC,Hefei 230088,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第9期92-97,共6页
Composites Science and Engineering
关键词
机织复合材料
嵌入式约束
绑定约束
有限元
细观力学模型
woven composites
embedded constraints
tie constraints
finite element
micro-mechanical model
