北京航空航天大学学报 ›› 2021, Vol. 47 ›› Issue (9): 1721-1728.doi: 10.13700/j.bh.1001-5965.2020.0305

• 论文 • 上一篇    下一篇

厚胶层复合材料黏接结构中超声反射/透射特性的有限元仿真

何存富, 李永坤, 吕炎, 宋国荣   

  1. 北京工业大学 材料与制造学部, 北京 100124
  • 收稿日期:2020-07-01 发布日期:2021-10-09
  • 通讯作者: 吕炎 E-mail:lvyan@bjut.edu.cn
  • 基金资助:
    国家自然科学基金(11972052,51875010);北京市教委科技一般项目(KM201710005012)

Finite element simulation of ultrasonic reflection/transmission characteristics for composite bonded joints with thick adhesive layers

HE Cunfu, LI Yongkun, LYU Yan, SONG Guorong   

  1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • Received:2020-07-01 Published:2021-10-09
  • Supported by:
    National Natural Science Foundation of China (11972052,51875010); General Program of Science and Technology Development Project of Beijing Municipal Education Commission (KM201710005012)

摘要: 针对厚胶层复合材料黏接结构,采用有限元法对其中发生黏接界面弱化、胶层内聚弱化时的超声反射/透射系数进行了仿真计算。在仿真模型中,利用弹性薄层物理场边界模拟了常规理论推导中的弹簧模型边界条件,通过改变胶层材料的弹性常数实现了对胶层内聚状态变化的模拟。仿真计算结果表明:随着黏接界面弱化程度的加剧,超声反射/透射系数频谱曲线将向低频方向偏移,而超声反射/透射系数角谱曲线将向大角度方向偏移;随着黏接结构中胶层内聚弱化程度的加剧,对应超声反射/透射系数频谱、角谱曲线的偏移趋势与发生黏接界面弱化时的情况一致。研究成果解决了利用有限元法对厚胶层复合材料黏接结构中黏接界面、结构胶内聚层进行模拟处理的问题,且仿真结果和理论计算结果吻合良好。

关键词: 黏接结构, 复合材料, 厚胶层, 超声反射/透射, 有限元

Abstract: For composite bonded joints with thick adhesive layers, finite element method is applied to calculate the ultrasonic reflection/transmission coefficients when bonding interfaces and cohesion of adhesive layers are degraded. In the simulation model, the boundary conditions of the spring model used in conventional theoretical derivations are modeled by using the physical field boundary namely elastic thin layer, and the cohesive state of the adhesive layer is simulated by changing the elastic constants of it. The simulation results show that the frequency spectrum curve of reflection/transmission coefficients will shift to the low frequency side and the angular spectrum curve of reflection/transmission coefficients will shift to the large angle side with the increase of degradation degree of bonding interfaces. In addition, when the degradation of the cohesion of adhesive layers is getting worse, the shift tendency of the corresponding frequency and angular spectrum curve of reflection/transmission coefficients is consistent with that when degradation on bonding interfaces occurs. The problem of simulating bonding interfaces and structural adhesive's cohesion layers in composite bonded joints with thick adhesive layers by finite element method is solved, and the simulation results are in good agreement with theoretically calculated results.

Key words: bonded joint, composite, thick adhesive layer, ultrasonic reflection/transmission, finite element

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