摘要:
An apparatus and method for determining the hardness of a granular material, comprises a base plate member, a sample cup for holding the granular material, an upper plate member, a crusher assembly and a crusher hammer release mechanism. The base plate member includes an upper surface with a recess for holding the sample cup. The upper plate member is positioned above and separated from the base plate member utilizing at least one separator post. The crusher assembly includes a crusher shaft, a crusher weight, a crusher hammer and a linear roller bearing having a retaining ring configured to slidably engage the crusher shaft through a conduit with the crusher weight and the crusher hammer positioned above and below the upper plate member respectively. The crusher hammer release mechanism includes a pair of levers operably connected to a latch cable having a latch pin that runs through a compression spring.
摘要:
Drop-weight tower (110) for reproducibly initiating a crack in a material sample for fracture mechanics testing comprising a base (120) with a top surface upon which a sample holder (124) is mounted to grip a material sample, an attachment column (140) having a linear rail (142), a carriage (162) attached to the linear rail (142) and a stage (164) is attached to the carriage. The stage (164) includes a vertical rod (184) and a razor-blade holder (178). A weight is slidably mounted to the vertical rod (184). The carriage is used to adjust the height of the stage (164) relative to the material sample. A hammer (180) slides up and down the vertical rod (184) to apply consistent and reproducible force on the razor (178) that then initiates the crack in the material sample.
摘要:
Die Erfindung betrifft eine Vorrichtung zum Bestimmen der Lagerungsdichte von ungebundenen Fugenmaterialien und / oder Bettungsmaterialien eines Fußbodenbelages, wobei die Vorrichtung ein Eindringelement zum Eindringen in das Fugenmaterial und / oder das Bettungsmaterial, eine Kraftaufbringeinrichtung und eine Messeinrichtung aufweist, wobei die Kraftaufbringeinrichtung derart ausgebildet ist, dass ein Kraftstoß mit vorbestimmter Kraft in einer vorbestimmten Richtung auf das Eindringelement ausübbar ist und wobei die Messeinrichtung eingerichtet ist zum Messen einer Strecke, um die sich das Eindringelement durch einen Kraftstoß bewegt hat, der auf das Eindringelement mittels der Kraftaufbringeinrichtung aufgebracht wurde.
摘要:
An apparatus and method for measuring the impact performance of a target material comprising a hollow structure comprising an outlet end located above a target. The hollow structure is dimensioned to allow free movement of a drop test object through the outlet end. A trigger is located proximate to the outlet end and a retaining member is located proximate to the outlet end and coupled to hollow structure. The retaining member is configured to retain the drop test object in the hollow structure upon activation of the trigger.
摘要:
A printed circuit board (2) is horizontally supported on a frame (5) so as to generate distortion in the printed circuit board (2) by a rigid ball dropped from an upper part, and buffer blocks (1A and 1B) are disposed to oppose to front and back sides of the printed circuit board. The buffer blocks (1A and 1B) are movably supported by a movable stage (3) so as to be appropriately brought into contact with the front and back sides of the printed circuit board (2). The buffer blocks (1A and 1B) are appropriately brought into contact with the printed circuit board distorted, regulates the distortion and relatively changes and adjusts peaks of a first distortion waveform and a second distortion waveform generated by impacts, and changes and adjusts the steepness of the distortion.
摘要:
The invention concerns a method for demonstrating the reliable functioning of automobile seat-belt locks operating in conjunction with belt tensioners, as well as a test device for carrying out the method. In the event of a crash, the belt lock is subjected to a high-energy shock owing to the activation of the belt tensioner. This shock must not, however, be allowed to cause the belt lock to misfunction, nor prevent it from opening reliably when the shock load has died away. The test device proposed generates reproducible shocks of up to 40,000 g; it makes it possible to optimise the design of elements subjected to high shock loads and to demonstrate that they are functioning correctly during and after being subjected to shock loads, both for quality-control purposes and to ensure conformity with manufacturer-liability laws.
摘要:
Systems and methods for creating sound bullets are described. Such sound bullets are created by controlling and/or redirecting highly nonlinear acoustic waves or pulses propagating through an array of actuators. The controlling and/or redirecting of the acoustic waves or pulses is achieved though methods such as applying pre-compressive forces to the array of actuators or by selection of size, shape and/or material of the actuators.