Dual boundary method for assembled plate structures undergoing large deflection

Abstract

In this paper, the Dual Boundary Element Method is combined with a multi-region formulation to simulate plate assembly undergoing large de ‡ection. The incremental load approach is used to treat the geometrical non-linearity and Radial Basis Functions are used to approximate the derivatives of the large de ‡ection terms. The Dual Reciprocity Method is used to transfer to the boundary all the domain integrals. Once the solution at the boundary is obtained for the assembly, a J-integral for large de ‡ection is implemented to extract the fracture parameters.

Boundary element analysis of stiffened panels with repair patches

“…This is probably due to the different adhesive models; present formulation allows relative rotations between plate and patch. The difference is even more clear in figure (15) where K 1b /σ applied are plotted against half crack size a for riveted and bonded patch. It can be seen how in [71], K 1b /σ applied remains almost constant, while it is growing with crack size, both for bonded and riveted.…”

“…The crack is then introduced, and SIF ratio K I /σ applied for membrane and bending against half crack size a are presented in figures (14)- (15). The behaviour of K 1m /σ applied is compared with the un-patched plate.…”

“…Here, a BEM formulation combining all the previous features is presented and is applied to the study a complex stiffened structure. Recent advances in BEM [4,11,26,56] and its application to plate can be found in [15,7,46,45,66,27,63,73,44,16,37]. In this paper, the above formulations are extended to allow for modelling of complex structures including all the features of stiffeners and repair patches.…”

“…If there are two or more angled plates joined together ( figure (3)), the approach proposed in [17,14,15] is followed. In order to simplify the description, the local coordinate systems for the M plates are assumed to be defined such that the x m 2 directions are all aligned with the same global direction along a straight join line.…”

Boundary element analysis of riveted aircraft panels

“…The BEM model of the plate assembly is constructed following previous work from the authors 16 and other applications have also been outlined. 15,17…”