Data analysis of the compression of a fabric can only be done using a mathematical model to smooth the results. The best formula is Van Wyk's, although the meaning of the physical parameters is very difficult to define for a fabric. On the basis of Van Wyck's equation, a study of the compressibility of a fabric whose weft is made of multiple threads (classic ply-yams, open-end, combed or carded) shows that the struc ture of a fabric has a higher value than the structure of a thread. The mechanical properties of a fabric are supposed to be essentially due to its construction and, to a lesser extent, to the threads from which it is made.
Positron lifetime measurements are reported on shock loaded Ti and titanium alloy BT14. It is shown that the explosive waves have a great effect on the positron annihilation parameters, connected with extensive changes in the structure of the material during dynamic deformation. The explosive wave produces vacancies, dislocations, and vacancy clusters. With the increasing of the wave pressure the concentration of dislocations and the size of clusters increase.
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