Damage growth in fibre bundle models with localized load sharing and environmentally-assisted ageing

Damage growth in fibre bundle models with localized load sharing and environmentally-assisted ageing
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具有局部负载共享和环境辅助老化的纤维束模型中的损伤增长

DOI:
10.1088/1742-6596/410/1/012064
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发表时间:
2013
期刊:
Conference Series
影响因子:
--
通讯作者:
Lennartz-Sassinek S
Lennartz-Sassinek S
中科院分区:
--
文献类型:
--
作者:
Lennartz-Sassinek S

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纤维束模型是研究岩土材料损伤累积复杂特性的最基本的模型之一。一个区分模型与局部负载共享(LLS)和模型与相等的负载共享(ELS)。虽然ELS模型可以用平均场理论来处理,但LLS模型的行为通常更复杂。在这里,我们考虑一个纤维束模型与LLS,此外,我们引入了一个时间尺度,通过将时间依赖性老化的纤维,由于累积的损伤驱动的局部作用应力在化学活性环境中。如果累积的损伤超过随机阈值,纤维就会失效。系统中累积损伤的非平凡时间依赖性可以归因于在不同时间尺度上占主导地位的不同机制。我们将这些信息纳入损伤累积过程的分析描述,并表明分析描述与数值结果是一致的。
One of the most fundamental models for the complex behaviour of damage accumulation in earth materials is the fibre bundle model. One distinguishes between models with localized load sharing (LLS) and models with equal load sharing (ELS). While ELS models can be treated by mean field theory, the behaviour of LLS models is usually more complicated. Here, we consider a fibre bundle model with LLS where, in addition, we introduce a time scale by incorporating time dependent ageing of the fibres due to the accumulation of damage driven by the locally acting stress in a chemically active environment. If the accumulated damage exceeds a random threshold, the fibres fail. The non-trivial time dependence of the cumulative damage in the system can be attributed to different mechanisms that dominate at different time scales. We include this information into an analytical description of the damage accumulation process and show that the analytical description is in agreement with numerical results.
蠕变断裂中的力量竞争和应力紊乱。
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