44results about How to "Accurate Mechanical Properties" patented technology

Disclosed are human tissue phantoms mimicking the mechanical properties of real tissue, and methods for manufacturing thereof including the steps of obtaining a computer aided three-dimensional design of a phantom mimicking the tissue in shape and size; fabrication of a mold form facilitating the production of the designed phantom; molding said phantom with the use of two-component silicon gels as a bulk tissue-mimicking material having Young's modulus in the range of 2 to 30 kPa; filling the enclosed volume of said phantom with anatomical and pathological tissue structures mimicking their respective mechanical properties and having Young's modulus in the range of about 30 to 600 kPa; covering said phantom by a protective layer having mechanical properties to a human tissue protective layer; and securing the phantom perimeter on a supporting plate by a rubber barrier. The example of used tissue-mimicking material is a two-component silicone SEMICOSIL gel with variable elastic properties and Young's modulus from 3 kPa to 600 kPa as a result of changing the silicon component ratio. As examples, the breast and prostate phantom tissue and their fabrication procedures are described.

An optical assembly having x, y and z axes and comprising: (a) a first substrate having a planar surface, a first wall adjacent and substantially perpendicular to the planar surface, a first register surface adjacent the first wall, at least one foundation to receive an optical element having a first optical axis at least partially along the z axis; (b) an opto-electrical device (OED) having a top surface, an active area on the top surface having a second optical axis normal to the top surface, and a first alignment element defined on the top surface, the OED mounted to the first wall such that the first alignment element contacts the first register surface to position the OED on the first substrate along at least one of the x or y axes with the second optical axis parallel to the planar surface.

A railroad crosstie (tie) may be fabricated from a composite material including a fiber reinforced polymer shell manufactured by pultrusion or other process, and filled by a suitable material, typically selected from expanded elastomeric polymer (such as polyurethane resin or other polymer), concrete, lightweight concrete formed by conventional aggregate, sand, cement, water, and an ultra light filler such as natural materials, sawdust, beads of expanded polymer such as expanded polystyrene, microspheres of glass or plastic, a recycled wooden tie in conjunction with any of the above, or the like. Fasteners may be driven such as spikes, threaded, such as screws, lag screws, spreading screws, rivets, or the like into apertures, pilot holes, or directly into fill absent apertures therein.

A mechanical environment testing system of an electromagnetic relay relates to the measuring field of the electromagnetic relay, solving the problem that the control information of vibration conditions and the monitoring information of contact states cannot be obtained simultaneously in existing testing processes. The system adds a contact monitoring module and the input end of the contact monitoring module is connected to a contact of a relay to be tested. The output end of the contact monitoring module is connected to the input end of a data collection module. The output end of the data collection module is connected to the input end of a microprocessor and the input end of a communication module. The microprocessor is connected with the communication module in series. The communicationmodule is connected with a USB port of an upper computer. The system combines the microprocessor and a real-time system to put up a closed-loop system and control an electromagnetic vibration table soas to achieve high control precision, truly simulate the working environment, exactly determine the failure mode of elements and mechanical weak links and further provide necessary material for vibration protection. The system realizes simultaneous working of the vibration test and the contact monitoring so as to more accurately record the mechanical weak links of the tested electric appliances.

The invention provides a method for preparing large-size bulk amorphous composite materials, which belongs to the field of preparing amorphous alloy (metallic glass) and composite materials thereof. The method applies to superplastic diffusion bonding of bulk amorphous substances and fiber, and is characterized in that the bulk amorphous substances and the fiber are arranged in a certain mode (such as a layered mode and the like), put into a mold, pressurized and thermally insulated under gas protection or vacuum for superplastic diffusion bonding; pressure is released after a certain period of time; and workpieces are taken out of the mold. The invention also provides a novel device for preparing large-size bulk amorphous, fiber / amorphous composite materials through superplastic diffusion bonding. The device consists of a heating system, a heat insulation system, a mold system, a loading system, a gas protection system and a cooling system. The method and the device have the advantages of reinforcing the fiber, enabling the shape of amorphous alloy-base composite materials to be designed, enabling the volume of the fiber in the composite materials to be controlled and enabling the fiber to be used in other various amorphous alloy systems low in amorphous formation capability, and are applicable to armor boards, armor-piercing shells and the like.

The present invention relates to a material interaction interface numerical simulation method considering nonlinearity and strain rate effect. The material interaction interface numerical simulation method considering nonlinearity and strain rate effect comprises the following steps of: establishing a constitutive relation model of tangential bonding-sliding and normal opening / compression nonlinearity of a material interaction interface under the action of a quasi-static load; quantifying the reinforcement effect of the strain rate effect and strain rate nonlinearity on the quasi-static constitutive relation model in the tangent direction and normal direction of the material interactive interface; defining the influence of the plastic damage effect on the tangential and normal constitutiverelation of the material interaction interface; establishing the failure judgment criterion of the material interaction interface in the hybrid mode; and defining a cohesive unit for the numerical simulation of the material interaction interface according to the material interaction interface constitutive relationship formed in the previous step based on LS-DYNA user-defined material module. Thematerial interaction interface numerical simulation method considering nonlinearity and strain rate effect can comprehensively and accurately describe the mechanical properties of the material interaction interface in the first and second modes, and reflects the dynamic performance of the material interaction interface under the strain rate effect and the nonlinearity and the influence of the plastic damage effect on the material interaction interface performance.