Francesco Ferrian, Alberto Sapora, Rafael Estevez, Aurélien Doitrand
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引用次数: 0
Abstract
The present work aims to investigate the failure size effect on flattened disks containing an eccentric circular hole under mode I loading conditions. For this purpose, uniaxial compression tests are carried out on polymethyl methacrylate (PMMA) samples with holes. Depending on the hole radius and eccentricity, the energy release rate is either an increasing or decreasing function of the crack length, thus affecting the stability of crack propagation. Experimental results are interpreted and discussed through the coupled stress and energy criterion of Finite Fracture Mechanics. The approach lies on the assumption of a finite crack advance and it is implemented through the numerical estimation of the stress field and the Incremental Energy Release Rate functions. Finally, stability and crack speed propagation are discussed under the assumption of Linear Elastic Fracture Mechanics. Theoretical predictions reveal in agreement with experimental results thus demonstrating that the Coupled Criterion effectively captures the failure condition.
本研究旨在探讨在模式 I 载荷条件下，含有偏心圆孔的扁平圆盘的破坏尺寸效应。为此，对带孔的聚甲基丙烯酸甲酯（PMMA）样品进行了单轴压缩试验。根据孔的半径和偏心率，能量释放率是裂纹长度的递增或递减函数，从而影响裂纹扩展的稳定性。实验结果通过有限断裂力学的应力和能量耦合准则进行解释和讨论。该方法基于有限裂纹前进的假设，并通过应力场和增量能量释放率函数的数值估计来实现。最后，讨论了线性弹性断裂力学假设下的稳定性和裂纹速度传播。理论预测结果与实验结果一致，从而证明耦合准则有效地捕捉了失效条件。
期刊介绍：
The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications.
The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged.
In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.
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