A review is presented on the topic of two-step yielding observed in complex fluids that cover a broad variety of materials ranging from colloidal gels, attractive glasses, emulsions, suspensions, and several commercial paste-like materials. The common features in various systems displaying two-step yielding behavior are the presence of two characteristic forces between the interacting particles or two varying representative length or time scales. This focused review aims to provide physical insights, mechanistic understanding of the two-step yielding and other associated rheological consequences of this nonlinear behavior. A discussion is provided on the microstructural details with an overview of different experimental systems exhibiting double-yielding studied so far highlighting the similarities and differences among them. Particularly, the effects of continuous phase properties, dispersed particle phase factors (size, shape, softness and surface charge) and external force field (electric, magnetic, thermal and shear flows) on two-step yielding are considered.

本文对在复杂流体中观察到的两步屈服问题进行了综述，该流体涵盖了多种材料，包括胶体凝胶，吸引人的玻璃，乳液，悬浮液和几种商用糊状材料。在显示两步屈服行为的各种系统中，共同的特征是相互作用的粒子之间存在两个特征力，或者存在两个变化的代表长度或时标。这篇重点综述旨在提供物理见解，对两步屈服的机械理解以及这种非线性行为的其他相关流变学后果。提供了有关微观结构细节的讨论，并概述了迄今为止展示出双收率研究的不同实验系统，突出了它们之间的异同。尤其，