305 results about "Drop tests" patented technology

Embodiments of the present disclosure include disposable wearable absorbent articles with anchoring systems. In an embodiment, a disposable wearable absorbent article includes an absorbent core and an anchoring system configured to anchor the absorbent core to a wearer. The article is configured to experience an average sag of less than a particular distance after a certain number of drops in a mannequin drop test

This invention provides a multilayer printed wiring board in which electric connectivity and functionality are obtained by improving reliability and particularly, reliability to the drop test can be improved. No corrosion resistant layer is formed on a solder pad 60B on which a component is to be mounted so as to obtain flexibility. Thus, if an impact is received from outside when a related product is dropped, the impact can be buffered so as to protect any mounted component from being removed. On the other hand, land 60A in which the corrosion resistant layer is formed is unlikely to occur contact failure even if a carbon pillar constituting an operation key makes repeated contacts.

A drop test apparatus for determining the resiliency of playing surface comprising a missile for impacting the surface including a guide for providing substantially unrestricted free flight of the missile, a pair accelerometers carried by the missile for producing signals in response to impact with the surface, a converter adapted to receive the accelerometer signals, convert them into computer readable signals and a computer receiving the signals from the converter and producing a graph of the surface hardness.

The invention discloses a drop test machine which is used for testing impact-resisting performance of an article to be tested. The drop test machine comprises a ball falling device, a load-bearing assembly and an electric cabinet electrically connected to the ball dropping device and the load-bearing assembly. The load-bearing assembly is used for bearing the article to be tested. The ball falling device is used for allowing an impact ball with the certain weight to fall on the article to be tested and offering preset impact force to test points of the article to be tested. The electric cabinet controls the ball falling device to adjust the falling vertical height of the impact ball and controls the load-bearing assembly to adjust the horizontal position of the article to be tested. Therefore, the impact ball falls down and is aligned with various test points of the article to be tested in sequence so that an impact-resisting performance test can be carried out on the various test points in sequence.

A method of improving the performance of a ball grid array package under temperature cycling and drop tests is disclosed. The method comprises forming a ball grid array with two types of solder balls. The first type of ball has a composition that improves performance under temperature cycling and the second set of solder balls has a composition that improves performance under drop testing. Preferably, the first set of balls is under the die near its perimeter and the second set of balls is located near the package perimeter, particularly at corners. A related concept pertains to a semiconductor device comprising a printed circuit board and a ball grid array package attached to the printed circuit board by an array of solder balls. The solder ball array comprises first and second sets of solder balls, the two sets having distinctly different compositions.

The invention discloses a crack initiation steel pipe for a full-scale gas bursting test of a large-diameter high-grade steel gas pipeline and a preparation method thereof, belonging to the field of a petroleum pipeline breakage control test. The steel pipe comprises the following components by weight percent: 0.07%-0.12% of C, 1.50%-1.75% of Mn, 0.15%-0.35% of Si, less than or equal to 0.015% of P, 0.010%-0.020% of S, 0.005%-0.030% of Al, less than or equal to 0.002% of O, less than or equal to 0.00015% of H, less than or equal to 0.005% of N and the balance of Fe; and carbon equivalent is less than or equal to 0.55%, and the cold cracking sensitive coefficient is less than or equal to 0.28%. The preparation method comprises the following steps: smelting and continuously casting the raw materials so as to form a thick slab; carrying out rough rolling and precise rolling so as to obtain a hot rolled steel plate; and forming the hot rolled steel plate, then welding, and then expanding diameter so as to prepare the steel pipe, wherein the yield strength of the steel pipe is 550MPa-840MPa, the tensile strength of the steel pipe is 625MPa-990MPa, the charpy impact toughness of the steel pipe at the temperature of 0 DEG C is controlled between 100J-200J, and the fracture shearing area in a drop test is larger than or equal to 85%. The prepared steel pipe is used as the crack initiation steel pipe for the full-scale gas bursting test; and after crack initiation is carried out, the fracture is of ductile fracture topography and has no obvious fracture separation.

The invention discloses a drop test device, which comprises a support beam and a base. A clamp is arranged on the support beam and comprises a clamping part. The clamping part is used for clamping an object to be tested and provided with a control module which is used for controlling the action of the clamping part. A base is positioned below the clamp so that the tested object drops on the base after falling from the clamp. The drop test device is characterized in that the support beam is provided with a slide rail vertically, the clamp is provided with a slide seat matched with a slide rail. The support beam is further provided with a fixture for fixing the clamp at a special position of the slide rail in the initial test state. The support beam is further provided with a sensitive switch for sensing the position of the clamp on the slide rail and outputting a position signal to the control module. The drop test device of the invention can guarantee the object to be tested not to shift in most process of the dropping, can enhance the test accuracy, and is suitable for the drop test of finished hard disks during the manufacturing of the mobile hard disks.

An object of the present invention is to provide a fall impact apparatus, namely a fall impact apparatus, which is capable of fixing the attitudinal angle of a test subject during a drop test until the moment at which the test subject collides with a dropping subject surface.The fall impact apparatus includes a test subject fixing member for fixing a test subject which is to be tested for impact strength at a desired attitudinal angle, a hoisting and dropping member for raising and dropping the test subject fixing member to which the test subject is fixed along the falling direction of the test subject, and a dropping subject surface structured so as to collide only with the test subject at the terminal end of the falling direction without interfering with the hoisting and dropping member when the hoisting and dropping member is dropped together with the test subject fixing member. The test subject fixing member is supported by the hoisting and dropping member without being affixed thereto such that when the test subject collides with the dropping subject surface, the fixing member separates freely from the hoisting and dropping member.

The invention discloses a drop test bed with a speed controllable rotation driving mechanism, which comprises a test bed rack, a hanging bracket and an undercarriage, wherein the hanging bracket is arranged in the test bed rack and can creep down along sliding ways of the test bed rack; and the undercarriage is fixed at the lower end of the hanging bracket. An electromotor is also arranged at the lower end of the hanging bracket. An electromotor belt pulley is connected to an output shaft of the electromotor. An airplane wheel belt pulley synchronous with an airplane wheel is arranged on the airplane wheel of the undercarriage, and is in transmission with the electromotor belt pulley through a belt. A travel switch is also arranged on the sliding way of the test bed rack, and controls the electromotor to stop when the airplane wheel is landed. The drop test bed with the speed controllable rotation driving mechanism has a light and compact structure, simple layout and reliable performance, and is convenient to operate.

The invention provides a drop test device based on an e-commerce product packaging box, which belongs to the technical field of drop test devices, and aims to solve the problem that when a box body isfixed on a test piece fixing frame of an existing drop test device, the box body is fixed very strenuously due to the fact that the box body is fixed through a fixing support. The device comprises abottom plate, and a sliding support member is fixedly connected with the middle part of the rear side of the upper end face of the bottom plate. Aclamping mechanism drives two clamping discs to clampthe box body,then the box body is moved upwards to a required height through the lifting mechanism,an external controller is used for controlling a rotating shaft of the clamping motor to reversely rotate, the clamping screws are rotated in opposite directions, so that the two clamping plates move in opposite directions, the box body loses the clamping effect, then the drop test is carried out, the box body does not need to be carried manually when the box body is fixed, more labor is saved when the box body is fixed, and the practicability of the drop test device is further improved.

The invention relates to the technical field of simulation evaluation of an air drop technology, in particular to an analog calculating method for the landing buffering process of the equipment air drop. The analog calculating method comprises the following three implementing steps of: establishing a finite element model of an equipment-airbag system by a computer; carrying out analog calculation on the landing buffering process of the equipment air drop on the basis of a nonlinear finite element; and generating an analog result of the landing buffering process of the equipment air drop. The analog calculating method implements the simulation on the landing buffering process of the equipment air drop on the basis of a nonlinear finite element method and also acquires a simulation calculation method for the airbag buffering characteristic of the equipment-airbag system and the equipment impact response characteristic, provides an effective measure for the demonstration, design and development work of air drop equipment, and solves the problems of high risk, high cost and long period of the equipment air drop test.