Archive image from page 60 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Measurements were taken along the same meridian as on the mold. The deviations shown are with respect to an arc described by a radius indexed with respect to the reference datum on con- cave surface. I I I I I 10 10 5 0 5 Lateral Radius (inches) Figure 30a. Typical deviations from nominal 33-inch radius of curvature on thermoformed sector 18 for the 66-inch-diameter capsule. hickness Before Thick
Archive image from page 60 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Measurements were taken along the same meridian as on the mold. The deviations shown are with respect to an arc described by a radius indexed with respect to the reference datum on con- cave surface. I I I I I 10 10 5 0 5 Lateral Radius (inches) Figure 30a. Typical deviations from nominal 33-inch radius of curvature on thermoformed sector 18 for the 66-inch-diameter capsule. hickness Before Thickness After Forming (in.) Forming (in.) Note: The increase in thickness is caused by lateral shrinking of previously 'unshrunk' grade G Plexiglas plate after it was subjected to 300 F forming temperature. The thinning out of the formed sector at the center is due to stretching of acrylic as the previously flat plate is forced to conform to the spherical surface of the mold. Figure 30b. Effect of thermoforming on thickness of sector 18 for the 66-inch-diameter capsule. 57
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