Hygrothermal vibration of adaptive composite magnetostrictive laminates supported by elastic substrate medium

Hygrothermal Aging of Polyimide Matrix Composite Laminates

Two polyimide-matrix systems were subjected to a series of hygrothermal aging experiments at various temperatures and relative humidities. For each aging condition, we measured the microcracking fracture toughness as a function of aging time. The toughness decreased with time. The rate of decrease increased with temperature and relative humidity. All experimental results could be fit to a simpl...

Vibration Monitoring of Composite Laminates with Delamination Damage

Vibration energy harvesting by magnetostrictive material

A new class of vibration energy harvester based on magnetostrictive material (MsM), Metglas 2605SC, is designed, developed and tested. It contains two submodules: an MsM harvesting device and an energy harvesting circuit. Compared to piezoelectric materials, the Metglas 2605SC offers advantages including higher energy conversion efficiency, longer life cycles, lack of depolarization and higher ...

Modeling of Hygrothermal Damage of Composite Materials

Composite materials have been used extensively in various applications, such as mechanical engineering, aerospace engineering, and aviation thanks to their interesting mechanical properties. However, a substantial drawback in the use of such composite materials is that they absorb a significant amount of moisture when exposed to severe hygrothermal conditions. This factor dramatically affects t...

Vibration-based damage identi cation in beam-like composite laminates by using arti cial neural networks

This paper investigates the effectiveness of the combination of global (changes in natural frequencies) and local (curvature mode shapes) vibration-based analysis data as input for artiŽ cial neural networks (ANNs) for location and severity prediction of damage in Ž bre-reinforced plastic laminates. A Ž nite element analysis tool has been used to obtain the dynamic characteristics of intact and...