Vibration damping composite material

A technology of damping materials and composite materials, which can be applied in the direction of shock absorbers, shock absorber-spring combinations, solid shock absorbers, etc., and can solve the problems of mechanical stability limitation of shock absorption performance

Inactive Publication Date: 2000-09-13
GORE ENTERPRISE HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, damping performance (i.e. reducing the amplitude of fluctuations or vibrations) has so far been limited due to the trade-off effect of cold liquid flow on mechanical stability

Method used

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  • Vibration damping composite material
  • Vibration damping composite material
  • Vibration damping composite material

Examples

Experimental program
Comparison scheme
Effect test

test approach 2-

[0114] Test Method 2 - Direct Determination of Dynamic Modulus in Fibrous Film Geometry

[0115] While relative comparisons of damping performance can be made by determining the damping performance on a steel shim in 3-point bending, the losses and storage modulus of the damping composite can also be determined directly. Although direct measurements in a bonded system do not employ this test, direct knowledge of these base material values ​​is useful in predicting performance in a variety of applications.

[0116] The specific DMA test method used to determine the dynamic loss and storage modulus of a composite material involves cutting the material into strips 0.635 cm wide by 3.0 cm long. Then sample (53) as Figure 15The clamp is shown in a DMA test fixture (54). The standard jaw face width used was 1.25 cm by 0.38 cm thick. The standard metric length (distance between jaws) used in the tests was 2.3 cm. The sample is then placed under a static force sufficient to preve...

example 1

[0151] A composite material is made from two separate components. The first component is a viscoelastic damping material sold by E.I. DuPont DeNemours as a PTFE solvent (code designation TE-5039A). Chemically, the damping material is an oligomeric perfluorocarbon compound, the oligomeric molecular weight distribution of which is primarily determined by the production and separation processes used in its manufacture and purification. The particular lot of material used in this example (Lot 59420-2) has a glass transition temperature (determined by DuPont DMA analysis) of approximately 2.3°C. At room temperature, this oligomer will flow slowly to fill a container, ie after sitting there for several hours. As the temperature increases (approximately around 50°C), the matrix becomes more fluid and easy to pour. Additionally, the fluid forms a contact angle with the PTFE that is less than 90 degrees and naturally wets the open porous PTFE material. Although this material has hig...

example 2

[0160] To demonstrate the ability to tailor composite properties by manipulating the viscoelastic component, a second composite was made using the same expanded PTFE tape as in Example 1, except that a different molar weight of fluoro-oligomer was used for vibration damping Element. In addition, the oligomer used was sold by E.I. DuPont DeNemours under the designation TE-5039A, but a different lot (lot 59540) was chosen because of its significantly higher molar weight. The glass transition point of this material, as measured by DuPont, was 9.1°C, significantly higher than that of the oligomer used to make the Example 1 sample. As expected, a higher glass transition temperature indicates greater mechanical stability with respect to cold liquid flow. However the material in pure form is still difficult to stabilize under normal vibration damping and when the material is left in a container for several days (at room temperature) it will flow to conform to the shape of the contai...

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Abstract

A new composite damping material is presented which exhibits an enhanced ability to dampen mechanical oscillations. The enhanced damping properties of this material are achieved through the entrapment of highly viscous damping fluids within the pores of a porous material (such as: an expanded polymer, felt, foam, fabric, metal, etc.). The entrapment of the fluid within the porous scaffold prevents flow, providing a stable composite which may be shaped into useful articles. Such a construct allows utilization of the high performance damping properties of fluids which, in pure form, are too fluid-like for most practical applications (which typically require a solid, stable, material). This composite, possessing damping performance approaching that of certain fluids, combined with stability in a solid form, can be used in many applications where materials are needed to damp the vibration of mechanical systems. Such applications include, but are not limited to, damping of vibrations which produce noise or degrade performance in airplanes, automobiles, space structures, machine tools, sporting goods, disk drive components and assemblies, electrical/electronic components such as transformers, electrical cables, etc. In addition, these composites may be used to alter or tune the mechanical response of a variety of systems to produce desired impulse or vibrational response.

Description

field of invention [0001] The present invention relates to vibration damping articles composed of two materials, 1) a porous framework that provides mechanical stability, and 2) a material that is unstable to cold liquid flow but has high viscous loss characteristics. Background of the invention [0002] Vibration damping is often required in many mechanical systems where normal disturbances can induce unwanted resonances. For example, the suspension system of a car traveling on rough roads can experience large unwanted vibrations unless properly damped. A typical suspension system consists of large springs connected between the chassis and the axle to provide compliance over bumps. This makes the acceleration of the chassis mass slow in response to the impact. Using a shock absorber that creates a force opposing the speed at which the spring compresses or extends provides the proper damping and dampens vibrations. [0003] The resonant frequency and size of the car suspe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F15/02C08J5/00C08J9/40C08J9/42C08L101/00F16F1/36F16F1/37F16F7/00F16F9/00F16F9/30F16F13/00F16F15/08
CPCC08J2475/00C08J2423/00C08J2433/00F16F1/37C08J9/40C08J9/42C08J2463/00C08J2483/00F16F9/30F16F9/003C08J2427/00F16F2224/048F16F13/00F16F7/00Y10T428/249958Y10T428/249986Y10T428/249953
Inventor S·P·萨顿F·普林西佩M·M·简蒂莱
Owner GORE ENTERPRISE HLDG INC
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