摘要: Contents in this report include: (1) Development of a precision casting process for acrylic plastic spherical shell windows applicable to high pressure service; (2) Acrylic plastic spherical windows under point impact loading; (3)... 展开 Contents in this report include: (1) Development of a precision casting process for acrylic plastic spherical shell windows applicable to high pressure service; (2) Acrylic plastic spherical windows under point impact loading; (3) Effect of bubble inclusions on the mechanical properties of cast polymethyl methacrylate; (4) Crazing and degradation of flexural strength in acrylic plates as a function of time; (5) Effect of weathering and submersion in seawater on the mechanical properties in acrylic plastic; (6) Effect of weather, age, and cyclic pressurizations on structural performance of acrylic plastic spherical shells under external pressure loading; (7) Polycarbonate plastic inserts for spherical acrylic plastic shells under hydrostatic loading; (8) Spherical acrylic pressure hulls with multiple penetrations; (9) Acrylic Plastic spherical pressure hull for 2439 m (8000 ft) design depth: Phase I; (10) Structural performance of acrylic plastic plane disk windows with twin conical bearing surfaces; (11) Hyperhemispherical viewpoints for undersea applications; and (12) The origins of acrylic plastic submersibles. 收起