The present work deals with the transferability of Friction Riveting joining technology from laboratory equipment to adapted in-house, low-cost machinery. A G13 drilling machine was modified for requirements selected technique, and joints were performed using polyethermide plates AA2024 aluminum alloy rivets 6 mm diameter. This diameter not previously reported Riveting. produced mechanically te...

A better understanding of mycobacterial gene regulation under certain stress conditions (e.g., low pH) may provide insight into mechanisms of adaptation during infection. To identify mycobacterial promoters induced at low pH, we adapted the recombinase-based in vivo expression technology (RIVET) promoter trap system for use with mycobacteria. Our results show that the TnpR recombinase of transp...

This paper presents the fracture analyses conducted on the FAA/NASA stiffened and unstiffened panels using the STAGS (STructural Analysis of General Shells) code with the critical crack-tip-opening angle (CTOA) fracture criterion. The STAGS code with the “plane-strain” core option was used in all analyses. Previous analyses of wide, flat panels have shown that the high-constraint conditions aro...

Here we undertook to identify colonization and gastric disease-promoting factors of the human gastric pathogen Helicobacter pylori as genes that were induced in response to the stomach environment. Using recombination-based in vivo expression technology (RIVET), we identified six promoters induced in the host compared to laboratory conditions. Three of these promoters, designated Pivi10, Pivi66...

This paper describes a Lamb-wave scanning method for the detection of notches simulating cracks at rivet holes in thin plates. The approach requires the generation of an ultrasonic So-Mode Lamb wave using an incident transmitter excited with a tone burst centered at a near non-dispersive frequency. Area scans are performed on a plate with a hole with a notch to generate times series information...

A three-dimensional stress-concentration analysis was conducted on straight-shank and countersunk (rivet) holes in a large plate subjected to various loading conditions. Three-dimensional nite-element analyses were performed with 20-node isoparametric elements. The plate material was assumed to be linear elastic and isotropic, with a Poisson's ratio of 0.3. Stress concentrations along the bore ...

Commercial transport aircraft are required to operate under the concept of damage tolerance. Because of the structural redundancy and the crack arrest capability, the current fleet of commercial aircraft was initially designed to have sufficient residual strength to sustain discrete source damage. However, fatigue damage during the life of an aircraft can significantly reduce the residual stren...

Machine learning is used in many fields nowadays to predict events, be it a pure classification or the prediction of certain values. Thus, these methods are also increasingly mechanical joining technology, for example joint strengths, defects and rivet head positions discrete result values such as interlock. This paper further shows how complete contour including output stresses, strains damage...

In this study, experimental and numerical investigations were carried out to achieve a comprehensive understanding of the impact surface conditions on self-piercing riveting (SPR) joint quality. Oil lubrication sandpaper grinding employed in tests change at rivet/top sheet, top/bottom sheets bottom sheet/die interfaces. A finite element (FE) model for SPR process was also adopted numerically as...

Abstract TC4 titanium alloy and AA6061 aluminum are widely used in the transportation industry because of their excellent mechanical properties lightweight. In this work, was solution heat treated between 800 °C 990 for 1 h, water cooled to room temperature. The riveting tensile tests at temperature were conducted evaluate joint performance. strength failure morphology discuss performance joint...