The last stage of material failure often shows a regime with power-law acceleration as the material lifetime is approached. We study this experimentally in tensile creep with paper samples using digital image correlation. The last, tertiary creep stage exhibits scale-free features in the sample response (strain rate) and its fluctuations. It is accompanied by an increasing localization of strain at the location of final failure. The main features are reproduced by a material model built on a viscoelastic fiber bundle model.

中文翻译：

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蠕变破坏后期变形时域局部化的无尺度特征

材料失效的最后阶段通常显示出随着接近材料寿命而具有幂律加速的状态。我们使用数字图像相关性在纸样本拉伸蠕变中进行了实验研究。最后的第三级蠕变阶段在样品响应（应变率）及其波动方面表现出无标度的特征。它伴随着应变在最终破坏位置的局部化。主要特征由建立在粘弹性纤维束模型上的材料模型再现。