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首页> 外文会议>IUTAM Symposium on Mechanical Behavior and Micro-Mechanics of Nanostructured Materials >ANISOTROPIC BEHAVIOUR OF SAND IN THE SMALL STRAIN DOMAIN--EXPERIMENTAL MEASUREMENTS AND MODELLING
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ANISOTROPIC BEHAVIOUR OF SAND IN THE SMALL STRAIN DOMAIN--EXPERIMENTAL MEASUREMENTS AND MODELLING

机译：小菌域中砂的各向异性行为 - 实验测量和建模

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This paper deals with the initial and loading path induced anisotropy for a sub angular granular material, Hostun sand. The "quasi" elastic properties observed in the small strain domain (<10~(-5) m/m) are considered. A "static and dynamic" triaxial device is used for the experimental campaign. First, the five parameters of the transverse isotropic elastic compliance tensor are experimentally obtained. The experimental investigations consist in applying small axial cyclic loadings (strain amplitude cycle epsilon_(sa) approx =10~(-5) m/m) and four types of dynamic wave propagations, generated by piezoelectric sensors (compressive and shear waves in axial and radial directions). The followed isotropic and deviatoric stress path underlines the effects of respectively inherent and induced anisotropy. A rheological hypoelastic model, called DBGS model, which takes into account the stress induced anisotropy, is firstly described. This model is not sufficient to properly describe experimental results at isotropic stress state as well as thus obtained during deviatoric stress path for medium and large strain. Then, an extension of the model is proposed, called DBGSP model, where strain induced anisotropy is taken into account. The concept of virtual strain induced anisotropy is introduced in this rheological hypoelastic model developed at ENTPE, and the ability of the model to foresee experimental behaviour is checked.
机译：本文涉及初级和装载路径诱导的副角粒材，宿主沙子的各向异性。考虑在小应变结构域（<10〜（-5）m / m）中观察到的“准”弹性特性。 “静态和动态”三轴设备用于实验活动。首先，通过实验获得横向各向同性弹性顺应性张量的五个参数。实验研究包括施加小的轴向循环负载（应变幅度循环EPSILON_（SA）约= 10〜（-5）m / m）和由压电传感器产生的四种类型的动态波传播（轴向和剪切波和轴径向）。其后的各向同性和脱极的应力路径强调了固有和诱导各向异性的影响。首先描述了一种流变性低弹性模型，称为DBGS模型，其考虑了应力诱导的各向异性。该模型不足以适当地描述各向同性应力状态的实验结果，以及如此获得的中等和大应变的脱抗应力路径。然后，提出了模型的扩展，称为DBGSP模型，其中考虑了应变诱导的各向异性。在entpe开发的这种流变抑制型模型中引入了虚拟菌株诱导各向异性的概念，并检查了模型预见实验行为的能力。

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