抄録
In this study, the anisotropy of bending rigidities of cloths with stitched seams were examined.
The results are as follows:
(1) When specimens (length; L, width; W) were cut at an angle θ for warp direction from cloths with parallel seam lines stitched (stitch pitch; p) at an angle α (0_??_α<90°) for warp direction, the domains were classified into two parts (A and B) by the number of seam lines contained in the width direction. If the angle between seam lines and specimen length direction was β, bending rigidities El of domain A and B and their fractions ∅ were given by the following equations. where k indicates [(W/p) cosβ] ([ ]; Gauss' notation), s, the size of seam line, (EI)cl, θ, bending rigidity of base cloth and (EI)s, β, bending rigidity of seam lines. There were given by applying the anisotropy theory by Shinohara et al.2)
(2) Bending rigidity of cloths in the conditions above mentioned was given by the following equation by applying the complex law of series model shown in another paper4) and the result shown in preceding paragraph.
(3) In the case of cloths with parallel seam lines (stitch pitch; p) crossing each other, (EI)θ was calculated by using the following equation with the length and contents of each domain changing in the direction of length of specimens obtained by the flow chart (Fig. 3) as well as with the bending rigidity (EI)θ i, calculated by applying eq. (10).
