Sliding Seismic Isolation Fabric for 60 MPa Durability
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Solution Overview
Problem
Conventional sliding seismic isolation devices face limitations in sliding durability under high bearing stress, particularly at 60 MPa, due to the compressive deformation of PTFE fiber layers, which restricts the effectiveness of improving durability without significant thickness increases.
Innovation Solution
A sliding seismic isolation device utilizing a single-layer fabric with high-strength fibers and PTFE fibers twisted together as warp or weft threads, attached to both sliding surfaces, enhances internal cohesion and reduces abrasion powder discharge, thereby improving sliding durability without substantial thickness increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a double-layered fabric with PTFE fibers and high-strength fibers is used to achieve high bearing stress resistance (60 MPa), then the seismic isolation performance is improved, but the sliding durability is reduced due to compressive deformation of the PTFE fiber layer
Solution Approach 1:
The patent uses a composite fabric structure combining PTFE fibers and high-strength fibers (such as PPS or aramid) in a single integrated layer. The high-strength fibers provide structural support to resist compressive deformation under 60 MPa bearing stress, while the PTFE fibers maintain low friction coefficients. This composite approach allows both high stress resistance and sliding durability without requiring increased thickness.
Solution Approach 2:
The patent creates local functional differentiation within the friction material by positioning PTFE fibers primarily on the sliding surface contact zone to provide low friction, while distributing high-strength fibers throughout the layer to resist compressive deformation. This local quality differentiation allows each fiber type to perform its optimal function without interfering with the other.
2Duration of action of moving object
If the thickness of the PTFE fiber layer is increased to improve sliding durability, then the abrasion resistance is improved, but the device size and cost increase significantly
Solution Approach 1:
The patent employs a composite fabric where high-strength fibers bear the compressive load, preventing excessive deformation that would otherwise require thicker PTFE layers to achieve the same durability. This allows the friction material to maintain optimal thickness while achieving enhanced sliding durability through the synergistic combination of fiber types.
Solution Approach 2:
The patent changes the structural parameters of the friction material by using a woven or non-woven fabric structure with specific fiber density and arrangement. This structural parameter optimization allows the material to achieve high sliding durability at reduced thickness compared to conventional homogeneous PTFE layers.
3Reliability
If conventional sliding seismic isolation devices are used to reduce seismic force, then the vibration reduction is achieved, but the cost competitiveness is reduced due to larger device size requirements
Solution Approach 1:
The patent uses composite fabric materials that provide both high strength and low friction properties, enabling the design of more compact sliding seismic isolation devices. The high-strength fibers allow the device to withstand seismic loads with smaller dimensions, while PTFE fibers ensure smooth sliding operation, thereby reducing overall device size and manufacturing cost while maintaining seismic isolation performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a sliding seismic isolation device with enhanced durability and resistance to high bearing stress of 60 MPa, maintaining coefficient of friction stability and extending service life by minimizing PTFE fiber deposition and maintaining effective friction performance.
Implementation Method 1
multiple plied yarns into which high-strength fibers and PTFE fibers are twisted together
Implementation Method 2
enhances internal cohesion and reduces abrasion powder discharge
Implementation Method 3
resistance to high bearing stress of 60 MPa
Implementation Method 4
high-strength fibers and PTFE fibers twisted together
Implementation Method 5
maintaining coefficient of friction stability and extending service life
Implementation Method 6
friction member composed of a single-layer fabric formed of multiple plied yarns into which high-strength fibers and PTFE fibers are twisted together
Data Source
AI summary
A sliding seismic isolation device includes a structure fixation plate having a first sliding surface and a metallic slider having a second sliding surface contacting the first sliding surface. A friction member composed of a single-layer fabric is attached to the first sliding surface, the second sliding surface, or both of the first sliding surface and the second sliding surface. One of a warp and a weft is formed of multiple plied yarns into which high-strength fibers and PTFE fibers are twisted together and the other of the warp and the weft is formed of multiple high-strength fibers in the single-layer fabric. The single-layer fabric has a twill weave and is woven such that the plied yarns of the one forming the single-layer fabric are exposed at a surface opposite from the attachment side of the friction member more than the high-strength fibers of the other forming the single-layer fabric.