Fatigue life and damage tolerance of postbuckled composite stiffened structures with indentation damage

Design optimization of stiffened composite panels with buckling and damage tolerance constraints

The design of stiffened, composite wing panels must satisfy a range of requirements related to performance, economy and safety. In particular, the design must be damage tolerant to satisfy a number of different performance requirements for various states of damage. To obtain an optimum configuration that satisfies these requirements simultaneously, optimization code PANOPT was extended with a m...

Damage tolerance and residual strength of composite sandwich structures

Study on Damage Tolerance Behavior of Integrally Stiffened Panel and Conventional Stiffened Panel

The damage tolerance behavior of integrally and conventional stiffened panel is investigated based on the fracture mechanics and finite element analysis. The load bearing capability and crack growth characteristic of both types of the stiffened panels having same configuration subjected to distributed tensile load is examined in this paper. A fourteen-stringer stiffened panel is analyzed for a ...

Failure Prediction of Stringer Stiffened Composite Panels with Impact Damage under Uniaxial Compression

The in-plane compressive behaviour of thin-skin stiffened composite panels with a stress concentrator in the form of an open hole or low velocity impact damage is examined analytically. A fracture mechanics model, developed initially to predict notched compressive strength, was applied to estimate the compression-after-impact strength of a stiffened panel; in the analysis the impact damage is r...

Applications of DTALE: Damage Tolerance Analysis and Life Enhancement [3-D Non-plannar Fatigue Crack Growth]

The solution of three-dimensional cracks (arbitrary surfaces of discontinuity) in solids and structures is considered. The BEM, developed based on the symmetric Galerkin BIEs, is used for obtaining the fracture solutions at the arbitrary crack-front. The finite element method is used to model the uncracked global (built-up) structure for obtaining the stresses in an otherwise uncracked body. Th...