This work examines the influence of a kerosene flame on residual mechanical tensile properties composite laminates manufactured by thermo-consolidation process from unidirectional (UD) carbon fibers and Polyether Ketone (PEKK) thermoplastic. Considering with two stacking sequences (orthotropic or quasi-isotropic - QI), exposure (116 kW/m2 1100 °C) composites structural integrity was examined as...

We investigate behavior of the stress tensor in the vicinity of elliptical hole cut-out from elastic material stretched on opposite sides by constant force. We perform the analysis on the linearized elastic model first with constant material coefficients and then with material coefficients depending on the concentration of diffusing fluid. In our model elastic coefficients are shrinking with in...

This paper presents two experiments in using “masks” to direct users’ attention within a graphical user interface. Bleaching, darkening, blurring, and a solid-color pattern overlay (screening) are used to de-emphasize background material, causing the target to visually “pop-out” at the user. The tradeoff between effectively directing the user's attention and ensuring the readability of the back...

Strength prediction is discussed using a traction-separation damage model incorporating material softening for bolted joint that fails in bearing mode. The modelliug approach in the bolted double-lap joint of current work is a simplistic approach to predict the strength of bearing failures. This is clearly shown in bearing failure which occurred experimentally at higher W/d ratios. A simple met...

A method is described by which poliovirus can be rapidly and simply concentrated by the use of a Diaflo XM-50 ultrafilter membrane. Freon-extracted ultrafilter concentrates banded in CsCl provided a 1,724-fold volumetric concentration of poliovirus. During concentration, trypsin-digested cellular material can pass through the ultrafilter membrane, thus providing a versatile means of degrading a...

We present the material analysis of scaffolding silk from the cobweb of the black widow spider Latrodectus hesperus. 30 strands were tested from the webs of nine spiders. Strands were stretched at 0.211 mm/s as force and extension were recorded. Cross-sectional area was measured under 1000 x oil-immersion light microscopy. The stress strain curve shows that cobweb silk is a distinct material fr...

The reversible and dynamic nature of non-covalent interactions between the constituting building blocks renders many supramolecular polymers stimuli-responsive. This was previously exploited to create thermally and optically healable polymers, but it proved challenging to achieve high stiffness and good healability. Here we present a glass-forming supramolecular material that is based on a trif...

Elasmobranchs, particularly sharks, function at speed and size extremes, exerting large forces on their cartilaginous skeletons while swimming. This casts doubt on the generalization that cartilaginous skeletons are mechanically inferior to bony skeletons, a proposition that has never been experimentally verified. We tested mineralized vertebral centra from seven species of elasmobranch fishes:...

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Geocell structures consist of a series of interconnected single cells, made from different polymer materials. The cell walls completely encase the infill material and provide an all-around confinement to the soil. The confinement effect is based on three main mechanisms: active earth pressure within loaded cell, passive earth resistance in the adjacent cells and hoop stresses in the cell walls....