| 摘要 |
<p>A method of making a design model for a composite stringer (2; 512) is disclosed. The stringer (2; 512) modelled has a foot (6) and a web (8). First data (506) defines the desired geometry of the foot of the stringer model, the separation of the foot from a datum plane (528) varying along the length of the stringer. A computer (502) generates second data (514) defining the geometry of the web of the stringer model by generating local changes in the geometry of the web at regions where it is determined from the first data (506) that the separation of the foot from the datum plane (528) changes. The local changes in the shape of the web are generated to reduce the risk of defects being created when fabricating a stringer made from layered composite material according to the stringer model. Undesirable creasing, stressing or stretching of composite material layers in a region in which the geometry of the stringer varies may thus be reduced.</p> |
