Wang Yiming, Zhong Yesheng, Huang Yining, Ma Xiaoliang, Shi Liping, He Xiaodong
Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Materials (Basel). 2024 Dec 13;17(24):6094. doi: 10.3390/ma17246094.
A thermal protection system is critical for ensuring the safe take-off and return of various aircraft. A key heat-resistant material within this system is the ceramic fiber insulation tile (CFIT), which is a porous three-dimensional network material with density ranges from 0.3 to 0.4 g/cm that exhibits complex mechanical behaviors. Due to the complexity of the service environment, experimental methods cannot accurately capture the mechanical behavior of a CFIT. Although simulation-based methods can provide insights, an accurate constitutive model for CFITs has yet to be established. To predict its complex mechanical behavior, an elastic-plastic damage constitutive model was established for CFITs. Based on the Hashin criteria and four fundamental assumptions, a yield rule was modified by introducing a damage factor in the TTT direction. The model was encoded into a user-material subroutine (UAMT) integrated within ABAQUS to capture the mechanical responses under four typical working conditions. The change trend of the simulation curve closely aligned with that of the experiment curve, better characterizing the stress-strain relationship of the CFIT under different working conditions such as compression, tension, and shear and the error was less than 18%. The proposed approach was validated by designing a millimeter-level indentation experiment. The results in this paper demonstrate that the maximum loading depths of the simulation and experiment were consistent, and the relative errors were within 12%, respectively. The research provides a reliable elastic-plastic damage constitutive model to predict the mechanical behavior of CFITs under complex working conditions.
热防护系统对于确保各类飞机的安全起飞和返回至关重要。该系统中的一种关键耐热材料是陶瓷纤维隔热瓦（CFIT），它是一种多孔三维网络材料，密度范围为0.3至0.4 g/cm³，呈现出复杂的力学行为。由于服役环境的复杂性，实验方法无法准确捕捉CFIT的力学行为。尽管基于模拟的方法可以提供一些见解，但尚未建立针对CFIT的精确本构模型。为了预测其复杂的力学行为，建立了CFIT的弹塑性损伤本构模型。基于Hashin准则和四个基本假设，通过在TTT方向引入损伤因子对屈服准则进行了修正。该模型被编码到ABAQUS中集成的用户材料子程序（UAMT）中，以捕捉四种典型工况下的力学响应。模拟曲线的变化趋势与实验曲线紧密吻合，能更好地表征CFIT在压缩、拉伸和剪切等不同工况下的应力-应变关系，误差小于18%。通过设计毫米级压痕实验验证了所提方法。本文结果表明，模拟和实验的最大加载深度一致，相对误差分别在12%以内。该研究提供了一个可靠的弹塑性损伤本构模型，用于预测CFIT在复杂工况下的力学行为。
