公开(公告)号：US07516053B1

公开(公告)日：2009-04-07

申请号：US11364647

申请日：2006-02-27

Applicant: Mu Lu

Inventor： Mu Lu

IPC: G06F7/64 ,  G06F17/13

CPC classification number: G06F17/5018 ,  G06F2217/16

Abstract: A system, method and software product for simulating fracture propagation in brittle materials is disclosed. Using the fracture energy release rates and the critical separations of the three fundamental fracture modes obtained independently from experiments, and a user defined normalized curve representing the traction-separation law, the present invention simulates the fracture propagation in a non-linear dynamic analysis. By using either dimensional or dimensionless effective separation approach, the actual tractions are calculated at each solution cycle based on user's choice. In addition, loading, unloading and reloading conditions are also continuously traced to ensure the proper constitutive equations are used. Three fracture modes are seamlessly mixed and integrated.

Abstract translation: 公开了一种用于模拟脆性材料中的裂缝扩展的系统，方法和软件产品。 使用独立于实验获得的三种基本断裂模式的断裂能量释放速率和临界分离，以及表示牵引分离定律的用户定义的归一化曲线，本发明模拟非线性动力学分析中的断裂传播。 通过使用尺寸或无量纲的有效分离方法，根据用户的选择，在每个求解周期计算实际的牵引力。 此外，还连续跟踪装载，卸载和重新加载条件，以确保使用适当的本构方程。 三种断裂模式是无缝混合和集成的。

公开(公告)号：US07386428B1

公开(公告)日：2008-06-10

申请号：US11025198

申请日：2004-12-29

Applicant: John O. Hallquist ,  Mu Lu

Inventor： John O. Hallquist ,  Mu Lu

IPC: G06F17/50 ,  B25J9/10

CPC classification number: G06F17/5018 ,  G06F2217/36

Abstract: A system, method and software product to simulate guided cable contacts is disclosed. The guided cable contact includes a slave node and an associated beam. A normal vector is established between the slave node's projection point and the slave node. Each of the slave node and two end nodes of the beam has three translational degrees-of-freedom. A spring is placed between the slave node's projection point and the slave node. The spring constant is assigned such that the spring is substantially stiffer than that of the beam. The guided cable contact stiffness matrix is then calculated using the spring constant, the normal vector, the length of the beam, and the distance between the first end node of the beam and the projection point. According to one aspect, the guided cable contact may be used for modeling human spinal column.

Abstract translation: 公开了一种用于模拟导向电缆触点的系统，方法和软件产品。 被引导的电缆触点包括从节点和相关联的光束。 在从节点的投影点和从节点之间建立法向量。 梁的每个从节点和两个端节点具有三个平移自由度。 弹簧位于从节点的投影点和从节点之间。 弹簧常数被赋予使得弹簧基本上比梁的刚度更硬。 然后使用弹簧常数，法向量，梁的长度以及梁的第一端节点与投影点之间的距离来计算引导的电缆接触刚度矩阵。 根据一个方面，所引导的电缆接触可用于建模人脊柱。