3. DESCRIPTION OF PROGRAM OR FUNCTION
SAMCR is a two-dimensional, elastodynamic, finite element code for the stress analysis of moving cracks. The code can be used to provide useful information about the Mode I fracture behavior of bodies under a combination of mechanical, thermal, and pressure loadings for materials that permit a linear-elastic fracture mechanics assumption. Major features of SAMCR are: efficient explicit finite element formulation based on four-node isoparametric quadrilateral elements; crack advance calculations based on a crack tip restraining force model; J-integral formulation for calculation of the dynamic stress intensity factor K; flexibility in the specification of the crack tip velocity versus K fracture constitutive relationship; thermal effects, both for thermal strains and for the crack tip velocity versus K constitutive relationship; energy calculations (strain, fracture, kinetic, and dissipated/damping) as a monitor of solution accuracy; automatic time step selection; "static" analysis using dynamic relaxation; and an analysis restart options.
The code has been shown to perform well in modelling dynamic behavior of both uncracked and cracked structures and has been demonstrated to provide useful information regarding run-arrest events in polymeric laboratory samples and large thermally shocked steel cylinders.
A graphics postprocessor, TEKPLOTS, is included which using data from SAMCR output files can generate the following plots: stress intensity factor versus time or crack tip location, crack tip location versus time, crack tip velocity versus time or crack tip location, energy components versus time, nodal displacements versus time, nodal accelerations versus time, and element strains versus time or normalized crack tip location.