粘性颗粒介质中的自应力与颗粒膨胀裂纹的形成
Self-stresses and Crack Formation by Particle Swelling in Cohesive Granular Media
摘要：
我们提出了一个分子动力学研究的力模式，拉伸强度和裂纹形成的粘性颗粒模型中的颗粒进行膨胀或收缩梯度。不均匀的颗粒尺寸变化产生自平衡力，一旦最强的拉伸接触开始失效，就会导致裂纹萌生。我们发现，粗粒度的应力是正确的弹性模型，将颗粒尺寸的变化作为度量演化预测。由于颗粒介质中的力传递不均匀，其抗拉强度远低于理论强度。裂纹在收缩时从边缘向内扩展，在膨胀时从中心向外扩展。
英文摘要：
We present a molecular dynamics study of force patterns, tensile strength and crack formation in a cohesive granular model where the particles are subjected to swelling or shrinkage gradients. Non-uniform particle size change generates self-equilibrated forces that lead to crack initiation as soon as strongest tensile contacts begin to fail. We find that the coarse-grained stresses are correctly predicted by an elastic model that incorporates particle size change as metric evolution. The tensile strength is found to be well below the theoretical strength as a result of inhomogeneous force transmission in granular media. The cracks propagate either inward from the edge upon shrinkage and outward from the center upon swelling.
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