利用梯度增强损伤模型对耐火材料断裂工艺区进行有限元建模

IF 3.5 3区 工程技术 Q1 MATHEMATICS, APPLIED
Zain Ali, Shengli Jin, Dietmar Gruber
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引用次数: 0

摘要

本研究采用梯度增强损伤(GED)模型,对镁尖晶石耐火材料等准脆性材料的断裂行为进行了数值模拟。研究重点是这些材料非线性响应的复杂建模,并通过楔形劈裂试验对传统和变异 GED 模型进行了比较。结果表明,所有 GED 模型都能很好地拟合实验数据。然而,传统 GED 模型在准确描述断裂过程区方面存在不足。相比之下,局部 GED 模型更准确地描述了断裂过程区,限制了虚假损伤分布,但需要更精细的网格划分,提高了计算要求。基于应力的变体可减少虚假损伤,但效果相对较差。研究还评估了异质强度分布在复制实验中观察到的真实裂纹模式中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Finite element modelling of refractories fracture process zone with gradient enhanced damage models

This study investigates the numerical simulation of fracture behaviour in quasi-brittle materials like magnesia spinel refractories using the Gradient-Enhanced Damage (GED) model. It focuses on the complex modelling of these materials non-linear responses and compares conventional and variant GED models through a wedge splitting test. The results demonstrate that all GED models show a good fit to experimental data. However, the conventional GED model falls short in accurately depicting the fracture process zone. In contrast, the localizing GED model more accurately represents the fracture process zone, limiting spurious damage distribution, but requires finer meshing, elevating computational demands. The stress-based variant reduces spurious damage but is less effective comparatively. The study also assesses the role of heterogeneous strength distribution in replicating realistic crack patterns as observed in experiments.

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来源期刊
CiteScore
4.80
自引率
3.20%
发文量
92
审稿时长
27 days
期刊介绍: The aim of this journal is to provide ideas and information involving the use of the finite element method and its variants, both in scientific inquiry and in professional practice. The scope is intentionally broad, encompassing use of the finite element method in engineering as well as the pure and applied sciences. The emphasis of the journal will be the development and use of numerical procedures to solve practical problems, although contributions relating to the mathematical and theoretical foundations and computer implementation of numerical methods are likewise welcomed. Review articles presenting unbiased and comprehensive reviews of state-of-the-art topics will also be accommodated.
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