Published in Applied Physics A
To study the effect of morphologies on the gas sensing behaviour, herein, we have synthesized three different CuO nanostructures, namely CuO nanobrick, CuO hierarchical flower-like and CuO nanochain. Hydrothermal method has been used to synthesize the CuO nanobrick and CuO hierarchical flower-like morphologies, whereas wet chemical method for CuO n...
Published in Fibers and Polymers
Composites based on ethylene-acrylic rubber and 1 mm short aramid fibers (AF) were developed by varying the fiber content from 3 to 40 phr. At 10 phr short fiber loading, the tensile modulus (10 % modulus) of the neat matrix was around 11 times increased. However, its breaking elongation was decreased from 408 to 58 %. This drastic reduction in the...
Published in SN Applied Sciences
AbstractChitosan and collagen-based hydrogel composites were successfully prepared at chitosan:collagen volume ratio of 1:1, 1:3, 1:5, and 1:10. The structural, thermal, morphological, swelling, mechanical characteristics were investigated, and in vitro degradation testing was conducted. Tetraethyl orthosilicate (TEOS) was used as a crosslinking ag...
Published in Journal of Nondestructive Evaluation
This paper studies the detection of hidden polymer matrix composite delaminations with a pitch–catch ultrasonic testing system and an agglomerative clustering algorithm. Existing ultrasonic testing methods characterize damage through normal-incidence pulse-echo measurements. Yet, these pulse-echo methods are ineffective at detecting delaminations u...
In aircraft design, proper tailoring of composite anisotropic characteristics allows to achieve weight saving while maintaining good aeroelastic performance. To further improve the design, dynamic loads and manufacturing constraints should be integrated in the design process. The objective of this paper is to evaluate how the introduction of contin...
In this paper we ultrasonic signals from array transducers are simulated using the Thompson and Gray measurement model. The measurement model consists of a beam model, a system efficiency factor which characterizes the response of the electro-mechanical and electrical components of the system, and a flaw scattering model. To inspect layered composi...
Published in Journal of the Brazilian Society of Mechanical Sciences and Engineering
The stiffness characteristics of composite leaf springs with a main spring and an auxiliary spring directly affect the handling stability and riding comfort of automobiles and finally determine its application value. In order to achieve precise calculation for the stiffness characteristics of composite leaf springs with a main spring and an auxilia...
The Liverpool Metropolitan Cathedral is the Roman Catholic Cathedral in Liverpool. It was constructed between 1962 and 1967, to the 1959 competition winning design of Sir Frederick Gibberd. The roof of the building is crowned by a tapering lantern formed from coloured glass adhered by means of an epoxy-based mortar. This construction method was exp...
Published in Mechanics of Soft Materials
The mechanical behavior of random fiber networks containing inclusions is studied in this work. Inclusions are considered spherical and of radius comparable to the network mean segment length. Their stiffness is varied in a broad range, from very soft to rigid. It is observed that the presence of inclusions modifies the small strain stiffness of th...
This paper presents an aero load correction strategy applicable to the static aeroelastic optimization of composite wings. The optimization framework consists of a successive convex subproblem iteration procedure, in which a gradient-based optimizer consecutively solves a local approximation problem. Responses are approximated as a linear and/or re...
