Over 135 million wood pallets were repaired for reuse in 1995. One of the most commonly damaged components in a wood pallet is the notched stringer. Metal plates, half companion stringers, and full companion stringers are repair methods described in the U.S. industry standard published by the American Society of Mechanical Engineers. This study evaluated the effect of these three stringer repai...

D. A. Skobir Balantič, B. Žužek, F. Vodopivec, Institute of Metals and Technology, Ljubljana, Slovenia Specimens of high chromium creep resistant steel were tempered at 800 °C for different times and examined in SEM. After short tempering stringers of cementite particles are formed at ferrite grain boundaries. By longer tempering, the content of chromium and molybdenum increase up to Cr18Fe3Mo2...

Over 135 million wooden pallets were repaired for reuse in 1995. Notched stringers are one of the most commonly damaged components. Metal plates, half companion stringers, and full companion stringers are repair methods described in the U.S. industry standard published by the American Society of Mechanical Engineers. This study evaluated the effect of these three stringer repair methods on the ...

Aghayan K.L On stress concentrators like stringers and cracks in an infinite plate and strip ................................... 5 Several works related to the contact and mixed problems of the theory of elasticity, which explores issues of mutual influence of two types stress concentrators in an infinite plate and strip are presented. Due to appropriate choice of the relative location of the s...

Elastic stability of ring and stringer-stiffened cylindrical shells under axial, internal and external pressures is studied using Ritz method. The stiffeners are rings, stringers and their different arrangements at the inner and outer surfaces of the shell. Critical buckling loads are obtained using Ritz method. It has been found that the cylindrical shells with outside rings are more stable th...

This paper discusses a non-destructive evaluation (NDE) technique for the detection of damage in composite aircraft structures following high energy wide area blunt impact (HEWABI) from ground service equipment (GSE), such as heavy cargo loaders and other heavy equipment. The test structures typically include skin, co-cured stringers, and C-frames that are bolt-connected onto the skin with shea...

An optimal design of internal pressurized stiffened conical shell is investigated using the genetic algorithm (GA) to minimize the structural weight and to prevent various types of stress and buckling failures. Axial compressive load is applied to the shell. Five stress and buckling failures as constraints are taken into account. Using the discrete elements method as well as the energy method, ...

Abstract A new investigated concept for passive load alleviation is to exploit the nonlinear behavior of wing design components trigger a deformation which reduce loads once critical level reached. The necessary torsional rotation supposed angle attack. For this target, wingbox sections are regarding their with finite element analysis. Parameter studies feature anisotropic carbon fiber reinforc...

This article deals with the design of helicopter UAV airframe components. There is a description of UAV airframe design modelling involving already existing components in three-dimensional (3D) form. The modelling methodology focuses in detail on proposed bulkheads by using “top-downbottom-up” methodology. In conclusion, there is a brief description of all proposed bulkheads and an outline of p...