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Volume 37, Issue 10
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AKIRA TAKIZAWA1981 Volume 37 Issue 10 Pages P345-P352
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
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TOSHIRO IIJIMA, Jai-Moon Kim1981 Volume 37 Issue 10 Pages P353-P360
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
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KENJI KAMIDE, SEI-ICHI MANABE1981 Volume 37 Issue 10 Pages P361-P368
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
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TAKEO SHIMIDZU1981 Volume 37 Issue 10 Pages P369-P375
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
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SHOJI KIMURA1981 Volume 37 Issue 10 Pages P376-P379
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
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III. CORRELATION BETWEEN MOLECULAR ORIENTATION AND VISCOELASTIC ANISOTROPYNori Yoshihara, Akio Fukushima, Yasushi Watanabe, Akemi Nakai, Shunji ...1981 Volume 37 Issue 10 Pages T387-T414
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSA phenomenological theory separating an isochronal data of temperature dispersion of the complex dynamic modulus function of PET into α, β, and γ relaxation mechanisms (αI, αII, β, γI, γII, and γIII) was proposed on the basis of the following three assumptions: (1) additivity for assessing the contribution of each relaxation mechanism to the viscoelastic functions; (2) validity of the time-temperature superposition hypothesis within each relaxation mechanism independently of other relaxation mechanisms; (3) symmetric loss modulus function of each relaxation mechanism with respect to reduced logarithmic frequency, and, in turn, to reciprocal of absolute temperature.
The temperature dispersion of loss modulus function for each (j-th) relaxation mechanism was represented by a Gaussian type function characterized by its height Aj, breadth C*j, and integrated intensity ΔEj, and the viscoelastic anisotropy in relation to molecular orientation was discussed in terms of the correlation coefficients between the viscoelastic constants, Aj, C*j and ΔEj, and the second and fourth moments of orientation distributions of crystalline and noncrystalline structural units for various types of stretched and annealed specimens of a quenched PET.
The highest correlation to the molecular orientations was found for ΔEj to result in the following conclusions: the β mechanical dispersion of PET being related not merely to the orientation relaxation of noncrystalline chain segments but also to the orientation relaxation of certain crystalline textures, if any; the αI mechanical dispersion of PET being related to the rotational relaxation of certain crystal grains probably around the crystal α axis owing to the nature of the (100) crystal plane to be the most easily glidable plane; and the γ mechanical dispersion (γII and γIII) being related to localized molecular distortions in noncrystalline chains.View full abstractDownload PDF (1716K) -
Akira Nakayama1981 Volume 37 Issue 10 Pages T415-T419
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn order to clarify the bending properties of the laminated clothes having regularly different bending rigidities, such as the padded clothes or the quilting coats, a non-uniform beam model whose bending rigidity is variant along the direction of the length is supposed. On the basis of the model an analytical method on the bending behaviour is considered.
It was proved that the analytical method using “Area-moment method” was effective for describing the bending of the laminated clothes with the ease in calculating with a micro computer.
By this method, if the distribution of bending rigidity and weight in a laminated cloth is previously known, it is possible to obtain the correct deflection curve.
Furthermore, referring to the deflection curve of the laminated cloth, the partially unknown bending rigidity can be calculated.View full abstractDownload PDF (354K) -
Kikuo Ban, Hiromitsu Otsuka, Kiyohisa Takahashi1981 Volume 37 Issue 10 Pages T420-T425
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe effect of hoop winding on tensile and compressive properties of glass fiber reinforced plastic (GFRP)-filament winding (FW) pipes has been investigated experimentally. Winding angles of the helical filaments in FW pipes were ±20°, ±30°, ±45°, and ±60°.
Both in tensile and compressive tests, specimens with the same shape and size were used. As for the specimen with hoop winding, Young's moduli on tension and compression are nearly equal. But the breaking strengths of the specimens with winding angle of ±20° and ±30° are considerably larger on tension than on compression, because of the difference of the failure modes: On tension, tensile breakage of fibers (+θ) and shear slippage between fibers (-θ) are observed simultaneously. While on compression, the fibers (±θ) are buckled and broken by bending.
The effects of adding the hoop winding (winding angle_??_90°) to the GFRP-FW pipe are as follows: (1) On tension, Young's modulus and Poisson's ratio decrease and breaking strength increases. (2) On compression, Young's modulus and breaking strength increase remarkably. (3) The pantographic deformation observed on tensile test of the ±45° specimen without hoop winding is restricted. (4) The helical propagation of cracks observed on compression of the specimen without hoop winding is arrested by adding the hoop winding.View full abstractDownload PDF (922K) -
Yoshiko Magoshi, Kinzo Ishikawa1981 Volume 37 Issue 10 Pages T426-T432
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe structure characteristics of silk plain fabrics were studied by means of high speed scanning microscopy (E. D. P.) pattern and the contact printing image.
The results obtained are summarized as follows.
1. The areas of the openings in the fabrics were 11-12% (gray), 3% (habutae) and 2% (crape). The shapes of the openings were: habutae and gray fabrics, in slit form with symmetry in respect to the perpendicular axis, and crape, in fusi- or triangle form with unsymmetry in respect to the perpendicular axis.
2. E. D. P. patterns were observed as checked patterns which differed depending on the warp shifting up and down at the intersection of warp and filling lines.
3. Judging from the optical properties, the fine structures of the silk plain fabrics were figured in detail in the fraunhofer diffraction patterns of the contact printing images.
4. In the fraunhofer pattern of E. D. P. pattern, the diffusion around the interference points are observed as equivalent density outlines.
5. Fraunhofer patterns of the silk plain fabrics contain exact informations of the area, number, form, size and position of the opening.View full abstractDownload PDF (2113K) -
Yoshiaki Shimizu, Mitsuo Kimura1981 Volume 37 Issue 10 Pages T433-T436
Published: October 10, 1981
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSAdsorptions of 1, 2-ethane disulfonic acid (EDSA), 1, 4-butane disulfonic acid (BDSA) and sulfuric acid as the model compounds of dibasic dyes on polyamide were studied by NMR, the adsorption experiment and the flow type microcalorimetry.
The results obtained are as follows:
(1) The adsorption isotherms of alkyldisulfonic acids and sulfuric acid on polyamide were the Langmuir type.
(2) Only one of the two sulfonic acid groups in alkyldisulfonic acids seemed to take part in adsorption.
(3) -Δμ°I is of alkyldisulfonic acids were larger than that of the corresponding alkylmonosulfonic acids, because of the larger -ΔH°C•θ=1 and ΔS°C•I.
(4) ΔS°C•I and |Δδ| of BDSA were larger than those of EDSA. These are due to the larger contribution of the hydrophorbic hydration in the former.
(5) ΔS°C•I was positive and decreased with temperature in all cases.View full abstractDownload PDF (226K)
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