Modeling and experimental study of mechanical properties of composite plate with unidirectional reinforcement

In the paper, authors present results of homogenization of GFRP material properties with unidirectional reinforcement. The scope of analysis and experimental study have been averaged mechanical properties of composite: Young modulus and Poisson’s ratio in orthotropic layer. Analytical calculations, computer simulation and experimental results have been presented. The work is a part of master’s thesis, prepared on Faculty of Automotive and Construction Machinery Engineering, Warsaw University of Technology.

Swelling and axial propagation of bulging with application to aneurysm propagation in arteries

The effect of swelling on axial propagation of bulging is investigated for thin cylinders made of doubly fiber reinforced incompressible non-linearly elastic materials. The swellable tubes are exposed to both internal pressure and axial loading. The materials under consideration are Treloar models augmented with two functions that are equal, each one of them accounting for the existence of a unidirectional reinforcement. The functions provide the anisotropic character of the material and each one is referred to as a reinforcing model. Two reinforcing models that depend only on the stretch in the fiber direction are considered: the so called standard reinforcing model and an exponential one. The former model is studied to assess the analytical methodology described in this paper. The latter one is related to soft tissue mechanical response and bulging propagation in these models establishes the connection with the propagation of aneurysms in arterial wall tissue. For the standard reinforcing model, it is shown that axial propagation of bulging is not feasible. On the other hand, for the arterial wall model axial propagation of bulging is possible for a certain range of material parameter values.

RANCANGAN DAN ANALISIS STRUKTUR SUDU TURBIN ANGIN LPN 10000 E

Structure of the LPN 10000 E wind turbine blade has been manufactured and its structural analysis to find out the strenght of this structure during its operation has also been conducted. The method of aero bending moment and centrifugal bending moment and load has been used while neglegting frcitional and torsional load. The analysis is obtained for composite blade strengthened by high strength carbon unidirectional reinforcement composite. With safety factor of 1.3 minimum, it was concluded that the blade is strong enough to use at its designed operational load.

The Effects of β-Si3N4 Whisker Content and Orientation on R-Curve Behaviors of Si3N4 Ceramics

The b–Si3N4 whisker randomly and unidirectionally reinforced Si3N4 composites were fabricated respectively. The high whisker alignment was obtained by extrusion processing. The R-curve behaviors were studied for the Si3N4 ceramics with addition of 3wt%, 5wt% and 10wt% b–Si3N4 whisker seeds respectively, and the effects of whisker orientation and content on the R-curve behaviors were analyzed and discussed. The ceramics with different whisker content and orientation showed well-defined R-curve behaviors. However, for the whisker random distribution, as its whisker content increased from 3wt% to 10wt%, the corresponding fracture toughness changed at an irregular trend; for the whisker unidirectional reinforcement, the fracture toughness in the direction perpendicular to whisker alignment was considerably improved, and most of indentation impressions tend to be very abnormal. The effects of whisker orientation and contents on the R-curve behaviors of the Si3N4 ceramics were further discussed.