脆性中空管状颗粒的颗粒集合体的高压缩
High compression of granular assemblies of brittle hollow tubular particles
摘要：
本文致力于研究脆性管状颗粒集合体高压缩性的微观力学根源。由于管状颗粒内存在大孔，该材料是极其多孔的。内部空隙的释放，由脆弱的外壳保护，使材料具有非常强的压缩能力。压缩响应的研究通过离散单元法，DEM，使用可压碎的元素。为了解决模型的复杂性，开发了一个分步分解。本文包括数值计算结果与作者和现有的实验结果的比较。通过DEM提供的见解，我们试图更好地理解起源于颗粒尺度的现象，并控制宏观行为。颗粒破碎被证明控制压缩行为，因此，内部孔隙的重要性占主导地位的颗粒间空隙。在此基础上，提出了一种新的压缩性分析概念，即通过分离双重孔隙和量化原生颗粒破碎引起的孔隙塌陷来进行压缩性分析。最后，提出了一个通用的，几何发展的半解析模型，旨在预测双重孔隙度随轴向应变的演变。
英文摘要：
This paper is devoted to the micro-mechanical origins of the high compressibility of brittle tubular particle assemblies. The material is extremely porous due to the presence of a large hole within the tube-shaped particle. The release of the inner void, protected by a fragile shell, gives the material a very strong ability to compress. The compressive response is investigated by means of the Discrete Element Method, DEM, using crushable-elements. To address the complexity of the model, a step-by-step break-down is developed. The paper comprises the comparison of the numerical results with both results obtained by the authors and existing experiments. With the insights provided by the DEM, we have sought to better understand the phenomena that originate at the grain scale, and that govern macroscopic behaviour. Grain breakage was proven to control the compressive behaviour, and thus, the importance of internal pores dominates the inter-particle voids. Then, a novel concept of compressibility analysis has been proposed using the separation of the double porosity and the quantification of the pore collapse through primary grain breakage. Finally, a general, geometrical development of a semi-analytical model has been proposed aiming the prediction of the evolution of double porosity vs axial strain.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
