ALTERNATIVE POSSIBILITIES OF BIAXIAL TESTING OF FIBER AND FABRIC MATERIALS IN NONSTANDARD CONDITIONS

Abstract eng:
The commonly used static uniaxial tensile tests don’t describe the properties of materials based on fibers sufficiently therefore a biaxial test has been utilized. An important requirement is to conduct the test also at significantly higher speeds and under various climatic conditions; due to sensitivity of fibrous materials to climatic influences, in particular temperature and humidity. This is for existing testing devices point where we encounter two significant insufficiencies. Firstly they have limited speed and maximal loading force. Secondly, their use for testing under extreme climatic conditions is almost impossible due to their usually electronic control. The aim of this work was to propose appropriate experimental facilities using only two engines instead of the usually required four that would be able to work at higher speed, under climatic loading and in limited space. Based on these findings a testing mechanism that can be placed in an external box of climate chambers connected to a laboratory hydrodynamic-circuit has been created. This method utilizes a sliding displacement of the jaws controlled with inner forces in a tested sample and four springs. Increased sensitivity of fibrous materials to the speed of strain and climatic conditions were detected during following experiments. Compared with other used tests, the concept seems to be sufficiently precise.

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