Strengthening Thin-Walled Knives with Nitrogen Plasma

Thin-Walled Tubes

The axial crushing of thin-walled tubes has been the subject of extensive research in the past. The existing kinematic models for predicting crushing behavior of axially loaded thin-walled tubes are systematically reviewed and analyzed. The advantages and limitations of each model are discussed. A new chain link model for circular tubes and square tubes is presented and studied in detail. Unlik...

Thin-Walled Structures

Experimentally determined natural frequencies and modes shapes are presented for an elastically point-supported isotropic plate with attached masses under impulsive loading. These results are compared to frequencies and to modes shapes determined from the Rayleigh–Ritz method and a finite element analysis using COMSOL. Accelerometers mounted at three locations on the plate, provide input for ME...

Thin-Walled Structures

This paper presents a procedure to determine an element-length dependent strain and stress relation until fracture that is suitable for implementation in finite element models. This material relation is obtained experimentally with an optical measuring system. The strain until fracture is calculated from the measured surface displacements. The stress is derived from the measured force and the c...

Knives of High Silica Content Glass for Thin-Sectioning

The use of glass knives in cutting sections for electron microscopy has been a standard procedure for several years. During this period various modifications in methods of scoring and breaking knives have been recommended, as well as types of glass which can be used (1, 2). Knives of high silica content glass were first suggested by Eaves and Flewett (1953) who reported that such knives retaine...

Weiss Knives