in conjunction with 
in conjunction with
| NAFEMS | STIFFENED PANEL | Test No TR1 | Date/Issue 2001-07-19/1 |
| ORIGIN | Benchmark BM-2, “Guidelines for Evaluation of Ship Structural Finite Element Analyses”, SSC-387, Ship Structure Committee, U. S. Coast Guard, Dec. 1995. |
| ANALYSIS TYPE |
Normal modes - ISO 10303-209 translator test |
| GEOMETRY All dimensions in metres |
|
| plate thickness 0.01 |
| STIFFENER SECTION | rectangular section stiffener with thickness=0.0105 m, depth=0.15 m | |
| aggregate beam properties | A=1.575´10-3
m2 Iyy=2.95312´10-6 m4 Izz=1.44703´10-8 m4 J (torsional constant)=5.53787´10-8 m4 |
|
| BOUNDARY CONDITIONS |
 |
| Edges AB and DA fully fixed Edge BC symmetric about yz plane, i.e. zero x-displacement, y-rotation, z-rotation Edge CD anti-symmetric about zx plane, i.e. zero x-displacement, z-displacement, y-rotation |
| MATERIAL PROPERTIES | Isotropic, E=207´109 Pa, n=0.3, r=7850 Kg m-3 |
| ELEMENT TYPES | beam and shell model | 4-noded shells (membrane and bending), with offset 2-noded beams |
| shell model | 4 or 8-noded shells, with stiffeners represented by one or two rows of shells |
| MESHES | BM-2-B | plate as 120 4-noded quadrilaterals, stiffeners as 24 offset 2-noded beams |
| BM-2-C | plate as 120 4-noded quadrilaterals, stiffeners as 48 4-noded quadrilaterals | |
| BM-2-D | plate as 120 8-noded quadrilaterals, stiffeners as 24 8-noded quadrilaterals | |
| BM-2 refined model | plate as 480 8-noded quadrilaterals, stiffeners as 96 8-noded quadrilaterals |
| OUTPUT | Four lowest natural frequencies | TARGET | Results published in SSC-387 |
Download the files corresponding to the benchmark:
| Data category | File Description | Provided by |
|---|---|---|
| Geometry specification | ISO
10303-203 class 5 - faceted b-rep 2001-08-06 |
NAFEMS |
| ISO
10303-203 class 4 - manifold surface 2001-08-06 |
||
| FE specification and results | BM-2-B
model and analysis controls, ISO 10303-209 class 9 2001-07-19 |
Electric Boat (Steve Gordon) |
| BM-2-D model and mode shape results, ISO
10303-209 class 10 2001-07-06 |
||
| BM-2-D mode shape plots and tabulation of results, MS
Powerpoint 2001-07-06 |