abaqus帮助文档翻译 2.1.11 一摞积木在通用接触下的倒塌分析.docx

2.1.11 Collapse of a stack of blocks with general contactProduct: Abaqus/Explicit This example illustrates the use of the general contact capability in a simulation involving a large number of contacting bodies. The general contact algorithm allows very simple definitions of contact with very few restrictions on the types of surfaces involved (see “Defining general contact interactions in Abaqus/Explicit,” Section 35.4.1 of the Abaqus Analysis Users Manual).Problem descriptionThe model simulates the collapse of a stack of blocks. The undeformed configuration of the model is shown in Figure 2.1.11–1. There are 35 blocks, and each block is 12.7 × 12.7 × 76.2 mm (0.5 × 0.5 × 3 inches) in size. The blocks are stacked on a rigid floor. The stack is subjected to gravity loading. It is assumed that a key block near the bottom of the stack has been removed just before the start of the analysis, initiating the collapse.Each block is modeled with a single C3D8R element. The use of a coarse mesh highlights the edge-to-edge contact capability of the general contact algorithm, because the majority of the block-to-block interactions do not result in penetrations of nodes into faces.Two different cases are analyzed. In the first analysis the blocks are rigid. In the second analysis the blocks are deformable. In the latter case, the material of the block is assumed to be linear elastic with a Youngs modulus of 12.135 GPa (1.76 × 106 Psi), a Poissons ratio of 0.3, and a density of 577.098 kg/m3 (5.4 × 10–5 lb s2/in4). Only the density is relevant for the analysis assuming rigid blocks. In addition, ENHANCED hourglass control is used for the deformable analysis. The rigid floor is modeled as a discrete rigid surface using a single R3D4 element.This model involves a large number of contacting bodies. The general contact capability greatly simplifies the contact definition, since each of the 595 possible block-to-block pairings does not need to be specified individually. The general co