基于机器学习的超高韧性水泥基复合材料板在近场爆炸荷载作用下的损伤预测

MACHINE LEARNING BASED DAMAGE PREDICTION OF ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITE PANELS UNDER NEAR RANGE EXPLOSION

  • 摘要: 结合使用高保真数值分析技术和机器学习方法,对600 mm跨度的超高韧性水泥基复合材料(UHTCC)板在1 kg的TNT当量以内的近场爆炸荷载作用下的损伤模式进行研究和预测,采用流固耦合算法建立了包含300个样本的UHTCC板爆炸响应数据库,分别使用既有的经验性预测方法和可解释性机器学习方法进行分析。结果表明:既有的McVay和Morishita经验方法仅能预测贯穿失效,而UFC 3-340-02方法无法预测所有损伤模式;基于极端梯度提升(XGBoost)算法建立的机器学习模型在分层10折交叉验证中表现优秀,能够实现对UHTCC板近场爆炸损伤的快速预测;不同损伤模式下的特征重要性不同,材料的拉压强度比在层裂和弯曲损伤中较为重要,可据此优化材料和结构设计,提升防护结构抗爆性能。

     

    Abstract: This study combines high-fidelity numerical analysis techniques and machine learning methods to investigate and predict the damage modes of Ultra-high toughness cementitious composite (UHTCC) panels under near-range explosion loads with a span of 600 mm and a TNT equivalent of up to 1 kg. An explosion response database of 300 samples of UHTCC panels is established based on the fluid-structure interaction algorithm, and both existing empirical prediction methods and interpretable machine learning methods are applied for analysis. The results indicate that the existing McVay and Morishita methods can only capture breach mode, while the UFC 3-340-02 method cannot predict any damage modes. The established machine learning model based on the eXtreme Gradient Boosting (XGBoost) algorithm performs excellently in stratified 10-fold cross-validation and can realize rapid prediction of near-field explosion damage of UHTCC panels. The feature importance under various damage modes is different, and the tensile-to-compressive strength ratio of the material plays a more significant role in spalling and bending damage. Based on this, material and structural designs can be optimized to improve the explosion resistance of protective structures.

     

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