Integrity of edge-debonded patch on cracked panel

Delamination effects on cracked steel members reinforced by prestressed composite patch

“…That is the crack growth in mode II is being mathematically forced to extend in a direction different from that occurs in nature. The strain energy density criterion [17,18] does not have such a limitation and will be used in the future to examine the difference in the results.…”

“…Adding G I and G II , however, gives rise to conceptual difficulties because mode I and mode II do not grow in the same direction. A more plausible criterion physically is that of the strain energy density approach [17,18]. It models crack extension as a discrete process instead of a continuous process.…”

On thermal buckling of patched beam-plates

“…In particular, the use of repair patches on aircraft structures has received increased atlention in rccent years. Examples of related work pertaining to patched structures may be found in the papers by Roderick (1980), Sih and Hong (1989), Baker (1993), Boltega (1995), Bottega andLoia (1996, 1997), BOllega and Karlsson (1999), and Bottega ( 1999a, 1999b). Though ' patching' may be an regarding loading, in-plane boundary conditions and the presence of imperfections.…”

The Effects of Patch Properties on the Debonding Behavior of Patched Beam-Plates

“…This type of structures can be found in a range of applications, for example, as repair-patches on aircraft structures where the patches are used to prevent existing cracks from growing. In this case, it is of course of primary interest to establish if a patch will prevent a crack from growing, and studies have indicated that adhering a patch over a crack is indeed a very efficient way of preventing further crack growth (for example Baker [1], Chiu et al [2], Chue et al [3], Park et al [4], Paul and Jones [5], Rodrick [6], Sih and Hong [7], and Tarn and Shek [8]). However, it is also of significance to determine the integrity of the structure: the patch may not, for obvious reasons, be allowed to disintegrate from the base structure.…”