A unified numerical approach for the simulation of intra and inter laminar damage evolution in stiffened CFRP panels under compression
A unified numerical approach for the simulation of intra and inter laminar damage evolution in stiffened CFRP panels under compression
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DOI：
10.1016/j.compositesb.2020.107931
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发表时间：
2020-06-01
影响因子：
13.1
通讯作者：
Ramji, M.
中科院分区：
文献类型：
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作者：
Kolanu, Naresh Reddy;Raju, Gangadharan;Ramji, M.
在屈曲后状态下运行的薄壁复合材料结构需要彻底了解其稳定性行为和失效机制。为了准确预测倒塌载荷，需要精确地考虑损伤演变。在当前的研究中，我们提出了一种统一且通用的数值建模方法，该方法可以解释加筋 CFRP 板的层内和层间损伤模式。提出了一种基于 3D 有限元的渐进损伤模型 (PDM)，用于模拟具有和不具有嵌入式脱粘缺陷的单叶片加筋复合材料 (SSC) CFRP 面板在单轴压缩载荷下的倒塌行为。在 Abaqus 软件中开发了基于 3D Hashin 失效准则的用户定义材料子程序，用于研究 SSC 面板层内损伤的演变。此外，蒙皮-加强筋粘合界面、蒙皮、加强筋中的层间界面（包括面条区域）均使用内聚区域元素进行建模，以模拟脱粘/分层生长。使用所提出的 PDM 获得的稳定性响应和塌陷载荷结果与实验观察结果进行了比较。此外，还通过实验估计验证了从开发的 PDM 中获得的损伤演化、失效机制、极限载荷和相应的位移数据。还进行了涉及超声波 C 扫描、红外热分析图和显微图像研究的综合损伤评估，以补充 PDM 预测。因此，所提出的 PDM 在损伤研究方面具有通用性，可用于研究具有多个加强筋的 CFRP 面板的倒塌行为。
Thin-walled composite structures operating in the post-buckling regime needs a thorough understanding of their stability behavior and failure mechanisms. For the accurate prediction of the collapse loads, one needs to account for the damage evolution precisely. In the current study, we have proposed a unified and generic numerical modeling approach that accounts for both the intra and inter-laminar damage modes in stiffened CFRP panels. A 3D finite element based progressive damage model (PDM) is proposed to simulate the collapse behavior of the single blade stiffened composite (SSC) CFRP panels with and without embedded de-bonding defects under uniaxial compression loading. A user-defined material subroutine based on 3D Hashin failure criteria is developed in Abaqus software to study the evolution of intra-laminar damages in SSC panel. Further, the skin-stiffener bonded interface, the inter-laminar interfaces in the skin, stiffener, including the noodle region, is modeled using the cohesive zone elements to simulate the de-bonding/delamination growth. The stability response and collapse load results obtained using the proposed PDM are compared with the experimental observations. Also, the damage evolution, failure mechanisms, the ultimate load, and the corresponding displacement data obtained from the developed PDM are validated with the experimental estimates. A comprehensive damage assessment involving the ultrasonic C-scans, infrared thermograms, and micrographic study is also carried out to supplement the PDM predictions. Thus, the proposed PDM is generic in terms of damage studies and can be used for investigating the collapse behavior of CFRP panels with multiple stiffeners.