Measurement of Cell Body and the Whole Surfaces of Long Fiber Reinforced Woven Composites

摘要

3D measurements at cell body and the whole surface scales are researched as one of the series of long fiber reinforced woven composites (LFRWCs) multi-scale measurement and evaluation. This paper proposes a method to determine the maximum sampling step (MaxSS) at cell body surface scale and the minimum cell body number (MinCBN) at the whole surface to solve the problem that the measurement results are inaccurate owing to the improper sampling parameters. Three LFRWC surfaces are tested as demonstrations to state the method concretely. The results show that as long as the woven style and the processing angle are confirmed for an LFRWC, the shape and the size of the cell body is constant. At cell body scale, the sampling area is equal to the cell body size, and the MaxSS is about fiber diameter. At the whole surface scale, the proper sampling step should not go beyond the MaxSS at cell body scale, and the MinCBN the sampling area should contain is different for various materials which should be determined based on the practical situation. This research provides a fundament for the precise evaluation of the relation between an LFRWC property and the whole surface topography.