In an innovative vision of manufacturing, orbital riveting is a joining technique characterized by high efficiency, energy saving, low costs and noise. It cold forming process where tool rotates at fixed angle (i.e., typically 3° to 6°) create sweeping line pressure around rivet. This movement progressively promotes, with each rotation, the collapse rivet shank down onto upper substrate joint, ...

for a fiber optical surface plasmon resonance (spr) sensor a short part of its cladding should be removed to coat a thin layer of a metal. usually this is problematic when an optical fiber with small core diameter is used. in this paper, a new method using µliter droplet of the hf acid for short fiber optical taper fabrication is reported. using this method in a multi-mode optical fiber with th...

Babu ska and Oh introduced a new approach, called the method of auxiliary mapping (MAM), that can effectively handle singularities in the framework of the p-version of the FEM. In this paper, this new approach is generalized so that it can yield highly accurate energy release rates for the cracks in composite materials. The results obtained by this method are more accurate than those obtained b...

Guided wave detection using different fiber optic sensors and their applications in damage detection for composite laminates were systematically investigated and compared in this paper. Two types of fiber optic sensors, namely fiber Bragg gratings (FBG) and Doppler effect-based fiber optic (FOD) sensors, were addressed and guided wave detection systems were constructed for both types. Guided wa...

Thermally drawn metal-insulator-semiconductor fibers provide a scalable path to functional fibers. Here, a ladder-like metal-semiconductor-metal photodetecting device is formed inside a single silica fiber in a controllable and scalable manner, achieving a high density of optoelectronic components over the entire fiber length and operating at a bandwidth of 470 kHz, orders of magnitude larger t...

Drilling-induced delamination is among the major concerns of applying the fiber-reinforced composite materials in various industries. Core drill ossesses the advantage for reducing the delamination by distributing the drilling thrust force toward the drill periphery. The thrust force of core rill varying with the conditions in drilling carbon fiber reinforced plastic (CFRP) is experimentally in...

Beam theory analysis was applied to predict delamination growth in DCB specimens reinforced in the thickness direction with pultruded pins, known as Z-fibers. The specimen arms were modeled as cantilever beams supported by discrete springs, which were included to represent the pins. A bi-linear, irreversible damage law was used to represent Z-fiber damage, the parameters of which were obtained ...

Fiber reinforced polymer composites are often used as a replacement for metal alloys because of the superior strength to weight ratio. However, major drawback these materials is lack formability caused by low strain failure ratio that does not allow material follow tooling contours into deep drawn shapes or tight radii. Composite have multiscale hierarchical structure where micro and meso scale...

GLARE (glass-reinforced fibre–metal laminate ) is aluminum based material of fiber metal (henceforth FML) that often fabricated by expensive autoclave procedure. In this study, the process Injected Molding or (also known as VARTM was employed a cost-effective alternative to produce GLARE. Several surface preparation procedures are applied improve interlaminar shear strength. A T3 temper 2024 al...

Advanced composites are not without a trade-off. Their increased designability brings an increase in the complexity of their internal geometry and, as a result, possible modes of failure. When two or more isotropic materials are combined in a composite, the isotropic failure modes may also combine. In a laminate, matrix delamination, cracking and crazing, and voids and porosity, will often comb...