HONDO, Time-Dependent Elastic and Inelastic Stress Analysis Using Finite Element Method

1 - Description of problem or function: HONDO2-SLA is used to compute the time-dependent displacements, velocities, accelerations, and stresses within elastic or inelastic, two-dimensional or axisymmetric or planar bodies of arbitrary shapes and materials. 2 - Method of solution: HONDO2-SLA is a finite-element method program. Finite strain calculations are incorporated. Spatially, the program employs a four-node iso-parametric quadrilateral element. In time, the program performs the integration using a central-difference method time integrator. Since the time integration scheme is only conditionally stable with respect to step-size, the program continuously monitors the step-size and adjusts it to keep the calculation stable. Five material subroutines are included covering elastic, visco-elastic, elastic-plastic, crushable foam, and soil behavior. Initial conditions on velocity but not displacement are allowed. Pressure loadings are allowed. Thermal loads are not implemented. The program includes a sliding interface capability which allows arbitrary values of the friction coefficient. An interface to the mesh-generation program QMESH and a restart feature are available. The user may choose between a constant stress element and a complete bilinear element with four stress states per element. 3 - Restrictions on the complexity of the problem: Large problems are easily accommodated and are limited only by the core available