Archive image from page 149 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 from overpressure to decrease to the level of strains generated by a simple long-term loading at operational pressure varies with the duration of loading at the overpressure level (Figure 112). 100 150 Time (minutes) Figure 111. Effect of temperature on viscoelastic strains on interior surface of equatorial region in 66-inch-diameter capsule under 500-psi sustained hydrostatic loading. Long-term volume dec
Archive image from page 149 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 from overpressure to decrease to the level of strains generated by a simple long-term loading at operational pressure varies with the duration of loading at the overpressure level (Figure 112). 100 150 Time (minutes) Figure 111. Effect of temperature on viscoelastic strains on interior surface of equatorial region in 66-inch-diameter capsule under 500-psi sustained hydrostatic loading. Long-term volume decrease, measured by the displacement of water from the interior of the large-scale capsule, was performed only at three different pressure loadings, as compared to nine different pressure loadings for model capsules. From the volume decrease measurements performed on large-scale capsule prototype, the following findings were made: 1. Long-term volume decrease is a function of both time and pressure. However, for any given duration of loading, it is approximately linear with the magnitude of pressure loading. The time-dependent rate of volume decrease for any given pressure loading appears to decrease exponentially with time, and to increase exponentially with the magnitude of pressure loading (Figures 113 and 114). 2. Upon depressurization from the long-term pressure loading, the volume of the large-scale prototype capsule returned to its original size after a relaxation period of approximately the same duration as the long-term pres- sure loading. The volume increase rates at the beginning of relaxation periods were higher than the volume decrease rates at the beginning of the long-term loading periods (Figure 115). 146
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