摘要:
A composite sandwich structure comprises a core sandwiched between composite laminate facesheets. The core includes a plurality of core sections spliced together at joints that incorporate integral features for arresting the propagation of irregularities in the facesheets.
摘要:
A method for joining materials in which a second material is overlapped over a first material preliminarily formed with a joining hole so as to cover the joining hole. A joining tool arranged in alignment with the joining hole is pressed, while rotated, onto the second material so as to locally soften and enter the second material in solid phase state into the joining hole of the first material through frictional heat generated between the joining tool and the second material. The joining tool is pulled out after a geometric engaging part is provided by the second material in relation with the first material and the engaging part is allowed to harden to join the first and second materials.
摘要:
An electronic device may have electronic components enclosed within a plastic housing. The plastic housing may include housing members that are joined using heat activated thermoset polymer film. The heat activated thermoset polymer film may be heated using a metal structure such as a strip of metal that is placed along a joint between the housing members. The temperature of the metal strip and associated layers of the thermoset polymer film may be raised by applying current to the metal strip using an external tool or the electronic components within the housing. Heat activated thermoset polymer film may be heated using a reactive multilayer metal foil. Heat sink layers of metal may be interposed between the reactive multilayer metal foil and the thermoset polymer film. A heated metal ring or a heated edge portion of a plastic housing member may also be used to heat the thermoset polymer film.
摘要:
Embodiments of thermal-acoustic sections for an aircraft for reducing noise along an acoustic path produced from an acoustic source are provided herein. The thermal-acoustic section comprises a first porous layer having a first characteristic acoustic impedance. A second porous layer is disposed adjacent to the first porous layer and has a second characteristic acoustic impedance that is greater than the first characteristic acoustic impedance. The thermal-acoustic section is configured to be positioned along the acoustic path such that at least a portion of the noise from the acoustic source is directed through the first porous layer to the second porous layer to promote absorption of the noise.
摘要:
A composite sandwich structure comprises a core sandwiched between composite laminate facesheets. The core includes a plurality of core sections spliced together at joints that incorporate integral features for arresting the propagation of irregularities in the facesheets.
摘要:
Embodiments of thermal-acoustic sections for an aircraft for reducing noise along an acoustic path produced from an acoustic source are provided herein. The thermal-acoustic section comprises a first porous layer having a first characteristic acoustic impedance. A second porous layer is disposed adjacent to the first porous layer and has a second characteristic acoustic impedance that is greater than the first characteristic acoustic impedance. The thermal-acoustic section is configured to be positioned along the acoustic path such that at least a portion of the noise from the acoustic source is directed through the first porous layer to the second porous layer to promote absorption of the noise.
摘要:
An electronic device may have electronic components enclosed within a plastic housing. The plastic housing may include housing members that are joined using heat activated thermoset polymer film. The heat activated thermoset polymer film may be heated using a metal structure such as a strip of metal that is placed along a joint between the housing members. The temperature of the metal strip and associated layers of the thermoset polymer film may be raised by applying current to the metal strip using an external tool or the electronic components within the housing. Heat activated thermoset polymer film may be heated using a reactive multilayer metal foil. Heat sink layers of metal may be interposed between the reactive multilayer metal foil and the thermoset polymer film. A heated metal ring or a heated edge portion of a plastic housing member may also be used to heat the thermoset polymer film.
摘要:
A composite sandwich structure comprises a core sandwiched between composite laminate facesheets. The core includes a plurality of core sections spliced together at joints that incorporate integral features for arresting the propagation of irregularities in the facesheets.
摘要:
The invention relates to a method for producing a component bond (70, 140) comprising: a fastening structure (60, 160) that has at least one component layer (60A, 60a; 160a, 160b); and a thermoplastic connecting element (10, 110) having a head (12, 112) and a shank (14, 114), in which method the connecting element (10, 110) is driven into the fastening structure (60, 160) under pressure whilst rotating, such that the shank (14, 114) penetrates the fastening structure (60, 160). The connecting element (10, 110), after penetrating the fastening structure (60, 160), is converted by friction into a softened, free-flowing state in a die (44, 144) which is placed against the fastening structure (60, 160) in the opposite direction to the driving direction, resulting in a thicker section (22, 22) that extends beyond the radial extent of some sections of the shank (14, 114). The fastening structure (60, 160) is thus interlockingly held between the head (12, 112) and the thicker section (22, 122).
摘要:
A composite sandwich structure comprises a core sandwiched between composite laminate facesheets. The core includes a plurality of core sections spliced together at joints that incorporate integral features for arresting the propagation of irregularities in the facesheets.