Department of Physics, California State University Fullerton, Fullerton, California 92831, USA.
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
Phys Rev E. 2023 Jan;107(1-1):014901. doi: 10.1103/PhysRevE.107.014901.
Using a simplified model for a non-Brownian suspension, we numerically study the response of athermal, overdamped, frictionless disks in two dimensions to isotropic and uniaxial compression, as well as to pure and simple shearing, all at finite constant strain rates ε[over ̇]. We show that isotropic and uniaxial compression result in the same jamming packing fraction ϕ_{J}, while pure-shear- and simple-shear-induced jamming occurs at a slightly higher ϕ_{J}^{*}, consistent with that found previously for simple shearing. A critical scaling analysis of pure shearing gives critical exponents consistent with those previously found for both isotropic compression and simple shearing. Using orientational order parameters for contact bond directions, we compare the anisotropy of the force and contact networks at both lowest nematic order, as well as higher 2n-fold order.
我们使用非布朗悬浮简化模型，通过数值方法研究了各向同性和单轴压缩下无热、过阻尼、无摩擦二维圆盘的响应，以及各向同性和单轴压缩下的纯剪切和简单剪切，所有这些都在有限的常应变率ε[over ̇]下进行。我们表明，各向同性和单轴压缩导致相同的阻塞填充分数ϕ_{J}，而纯剪切和简单剪切引起的阻塞发生在略高的ϕ_{J}^{*}，这与先前对简单剪切的发现一致。纯剪切的临界标度分析给出了与先前对各向同性压缩和简单剪切的发现一致的临界指数。我们使用接触键方向的取向有序参数，比较了在最低向列序以及更高的 2n 倍阶时力和接触网络的各向异性。
