TY - JOUR AU - P. Reddy AU - G. Ramamurthy PY - 2013/01/01 Y2 - 2024/03/29 TI - Stress Intensity Factor using Finite Element Analysis in Rectangular Orthotropic Composite Annular Disk JF - Defence Science Journal JA - DSJ VL - 47 IS - 1 SE - Special Issue Papers DO - 10.14429/dsj.47.3977 UR - https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/3977 AB - The quadratic isoparametric elements which embody the inverse squareroot singularity were used to determine the stress intensity factor in an annular disk made of Boron-Epoxy composite material. The displacements and stresses were determined in a rectangular orthotropic composite annular disk using isoparametric finite elements. The singularity in the strain field was provided by means of 8-noded isoparametric elements (4-nodes at the four corners and four mid-side nodes each at l/4th distance from the edge). The results were obtained for various material properties and fibre orientation. The geometry of the annular disk was reported when subjected to a boundary radial and tangential. The r singularity was provided at the boundary of the circular hole and the rest of the annular disk was modelled with ordinary isoparametric elements. The apparent stress intensity factor (K/sub I/=) was computed from the stress data near the circular hole, when it was subjected to uniform tension. A curve was drawn for apparent stress intensity factor versus the distance from the crack edge and was extrapolated to r = 0, the actual stress intensity factor was found on the y-axis. ER -