摘要:
An apparatus measures residual stress in a sample under test by measuring the penetration of an indenter on a unprocessed sample under test, and after processing of the sample under test, measuring again the penetration of the indenter on the processed sample under test, and deriving from the two penetration measurements the residual stress in a sample under test. The apparatus and method of the preferred embodiments are especially useful in determining residual stress in a printed wiring board. In this manner a direct measurement of residual stress is possible without destroying the printed wiring board.
摘要:
A method and system for cooling an electrical heat source is disclosed. A heat exchanger has two principal sub-assemblies. A closed-loop fluid flow is provided through a second sub-assembly, disposed next to a heat source. An open-loop fluid flow is provided though a first sub-assembly in communication with a second sub-assembly. Each of the first and second sub-assemblies has a rotational element. The fluid flow entering the first sub-assembly rotates the first rotational element, and magnetic communication between the rotational elements causes movement of the second rotational element, thereby achieving fluid movement within the second sub-assembly. Operationally, the closed-loop sub-assembly removes heat from the heat source and transfers it to the open-loop sub-assembly for subsequent heat transfer in a downstream fluid flow.
摘要:
An electrical connector monitoring system for a plug and receptacle assembly, that includes a plug connected to the plug assembly, a recess located within the plug, an electrically insulative layer disposed in the recess, a wear member disposed on the plug that at least partially traverses the insulated recess and in electrical contact with the plug, a contact member movably connected with a receptacle of the receptacle, and a signal device in electrical connection through a circuit with the plug, wear member, and contact member when the plug is fully seated within the receptacle.
摘要:
The exemplary embodiments of the present invention provide a method and system for aligning graphite nanofibers in a thermal interface material to enhance the thermal interface material performance. The method includes preparing the graphite nanofibers in a herringbone configuration, and dispersing the graphite nanofibers in the herringbone configuration into the thermal interface material. The method further includes applying a magnetic field of sufficient intensity to align the graphite nanofibers in the thermal interface material. The system includes the graphite nanofibers configured in a herringbone configuration and a means for dispersing the graphite nanofibers in the herringbone configuration into the thermal interface material. The system further includes a means for applying a magnetic field of sufficient intensity to align the graphite nanofibers in the thermal interface material.
摘要:
The present disclosure is directed at an apparatus for changing printed circuit board pad structure to increase solder volume and strength. The invention provides increased end row pad and lead size and utilizes a plurality of lead-to-pad and pad-to-lead conforming geometric structures to form a joint providing additional solder surface adhesion area.
摘要:
A system and method for utilizing lead-free multi-core modules with organic substrates,including a base portion configured to attach a semiconductor chip;and a cap portion further comprising: a bottom portion configured to be sealed to the base portion;and a vacuum port;wherein when a vacuum is drawn at the vacuum port,a re-workable seal between the base portion and the cap portion is provided to enable rework.
摘要:
An electrical connector includes a first connector body having an interlocking feature extending therefrom. The interlocking feature interlocks the first connector body with a complimentary interlocking feature extending from an adjacent second connector body to distribute a lateral force on either the first or second connector bodies across the adjacent connector body thereby reducing a rotational moment at a base of each electrical connector connected to a printed circuit board (PCB).
摘要:
A method and system for determining material properties of a cross-section of an anisotropic sample material. An ultrasonic signal is applied to the surface of the anisotropic sample material, which comprises multiple constituent material layers, such that a characteristic medium wave is induced within each of the constituent materials. Each of these characteristic medium waves is sampled over a time interval to obtain a test waveform. This resultant test waveform is then spectrum analyzed utilizing cepstrum noise filtration, such that the material properties of said anisotropic sample material may be determined.
摘要:
The chip stack of semiconductor chips with enhanced cooling apparatus includes a first chip with circuitry on a first side and a second chip electrically and mechanically coupled to the first chip by a grid of connectors. The apparatus further includes a thermal interface material pad placed between the first chip and the second chip, wherein the thermal interface material pad includes nanofibers aligned parallel to mating surfaces of the first chip and the second chip and nanofibers aligned perpendicular to mating surfaces of the first chip and the second chip.
摘要:
A method and structures are provided for implementing enhanced thermal conductivity between a lid and heat sink for stacked modules. A chip lid and lateral heat distributor includes cooperating features for implementing enhanced thermal conductivity. The chip lid includes a groove along an inner side wall including a flat wall surface and a curved edge surface. The lateral heat distributor includes a mating edge portion received within the groove. The mating edge portion includes a bent arm for engaging the curved edge surface groove and a flat portion. The lateral heat distributor is assembled into place with the chip lid, the mating edge portion of the lateral heat distributor bends and snaps into the groove of the chip lid. The bent arm portion presses on the curved surface of the groove, and provides an upward force to push the flat portion against the flat wall surface of the groove.