No abstract

In the presented work, static and dynamic properties of two, theoretically identical composite rods were studied. Those two kinds of rod were made of pre-impregnated fibers so called "prepregs". The first of them was made by means of wrapping technology, which is simply just helical layering of one wide tape around a rotating mandrel. The weakness of this method is possible using only for straight parts. That is why a simultaneous deposition of several thinner filaments in a form of tape called winding was used in order to optimize this technology also for curved parts with various cross-sections. The target of this work was to compile numerical model and experimentally compare flexural strength of the theoretically identical wrapped and wound rods in the static three point test.Further small samples cut and extracted from those rods were subjected to dynamic bending loading on Dynamic Mechanical Analyzer, with various loading speed, in order to obtain also the dynamic properties. The found results and conclusions of this article should provide a basic idea how significantly the manufacturing process could affects the microstructure and real mechanical properties of long fibers composite parts.

The car seat is tested in the conditions of real car operation, ie under the conditions of multi-axis loading. We will examine all the possible parameters and maybe find some objective conclusions for the car seat design. The content of this article is the innovation of car seat measurement device in laboratory conditions. The existing device allows only the vertical movement of the car seat to realize. The goal of the innovation is to complement the device so that the vertical movement of the car seat can be realized simultaneously with the horizontal movement.

The car seat comfort depends on many parameters of the seat and the characteristics of the people sitting on the seat. Each person is different, behaves differently and feels differently. The seat cannot suit everyone, or it must be required the car seat to adapt automatically to the person sitting on it. That is why we test the car seat in real conditions in the car, i.e. in conditions of simultaneous loading of more axes. This paper describes the innovation of measuring equipment for car seats in laboratory conditions. The introduced innovated device allows realizing how vertical movement of the car seat as well as horizontal movement. The vertical movement can be realized independently or simultaneously with the horizontal movement. Measurement methodologies and test signals are also described in the paper.

Characteristics cushions from PU foam together with coat determine comfort automobile seats. Frame of car seat with cushion from PU foam and cover serve like body rest. Also perform safety rules, that are demanded on car seat. Cushion in car seat is basically manufactured from PU foam. Experimental testing their property investigate correlation between their characteristic and comfort. One type of experiment is combination static and dynamic loading in medium term time interval . Subject research and content hereof article is recognition transmission characteristics and contact pressures cushions from PU foams in time interval two o'clock in turns static and dynamically weight constant loading.