抄録
In this paper, repeated compression-recovery behaviours of cylindrical fiber assemblies made of cupra fibers, and polyester fibers with heteromorphic and round sections are investigated experimentally with regard to sleeping comfort. The results are obtained as follows. (1) The same tendency in repeated compression-recovery behaviour is observed for three samples. The features of fiber type are recognized within sixth cycles, and after sixth cycles, the curves become converged to the same curve. (2) For compression displacement, three samples show different level of displacement under the condition that solidity is 0.0125 and maximum compression stress is 1176 Pa. The displacement of cupra fiber is the largest, and that of polyester fiber with heteromorphic section follows, and that of polyester fiber with round section is the smallest. (3) For WC, compression energy in compression process, the behavior has the same tendency as that of compression displacement. In contrast, the behavior of WC&prime, compression energy in recovery process is different from that of compression process. (4) The compression-recovery curve at sixth cycle under the condition that solidity is 0.0125 and maximum compression stress is 1176 Pa is analyzed using linearizing method. The relation between the logarithm of compression stress(Pc) and the logarithm of compression displacement(T) is linear. Empirical equation, Pc=ATn is obtained, where A and n are constant parameters depending on material properties, measurement condition and compression stress.
