论文标题
通过触发低强度雪崩来控制裂纹动力
Controlling crackling dynamics by triggering low intensity avalanches
论文作者
论文摘要
我们研究了小型，空间局部的激发的影响，以不同的方式定期应用，对在异质固体中缓慢驱动的脆性裂纹的脆弱动力学应用。正确调整后，观察到这些激发可以从根本上修改雪崩统计数据，并大大限制了最大事件的大小。令人惊讶的是，这在激发时不需要有关正面加载状态的信息；将其应用于随机位置，或在最负载点上涂抹相同的结果。随后，我们揭示了激发幅度，空间范围和频率如何控制效果。我们发现激发效率由单个降低参数统治，即每单位前长的注入功率；极端雪崩的抑制在此控制参数的明确最佳值下最大。该分析为控制crack动力学中的最大事件开辟了一种新方法。除了断裂问题之外，它可能与同一通用类别的模型所描述的crack裂系统有关，例如异质底物的润湿或无定形磁铁中的磁壁。
We examine the effect of small, spatially localized, excitations applied periodically in different manners, on the crackling dynamics of a brittle crack driven slowly in a heterogeneous solid. When properly adjusted, these excitations are observed to radically modify avalanche statistics and considerably limit the magnitude of the largest events. Surprisingly, this does not require information on the front loading state at the time of excitation; applying it either at a random location or at the most loaded point gives the same results. Subsequently, we unravel how the excitation amplitude, spatial extent and frequency govern the effect. We find that the excitation efficiency is ruled by a single reduced parameter, namely the injected power per unit front length; the suppression of extreme avalanches is maximum at a well-defined optimal value of this control parameter. This analysis opens a new way to control largest events in crackling dynamics. Beyond fracture problems, it may be relevant for crackling systems described by models of the same universality class, such as the wetting of heterogeneous substrates or magnetic walls in amorphous magnets.
