Self-lubricating Composite Joint for High Dynamic Load
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Solution Overview
Problem
Existing self-lubricating polymer joints are unsatisfactory under high dynamic loads due to poor load behavior and risk of flow and delamination, particularly for loads above 60 MPa.
Innovation Solution
A self-lubricating joint formed by winding thin fabric strips (20 μm to 150 μm thick) mixed with resin and fillers, crossed in multiple layers using the filament winding technique, providing improved homogeneity and resistance to frictional stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thick fabric strips (300 μm) are used to achieve desired thickness, then manufacturing is easier with fewer layers, but homogeneity across thickness is poor and delamination risk increases under dynamic load
Solution Approach 1:
The fabric is divided into thin strips (20-150 μm thickness) arranged in multiple crossed layers instead of using fewer thick layers. This segmentation allows each layer to be more homogeneous while the multiple layers collectively achieve the desired total thickness, resolving the contradiction between ease of manufacture and homogeneity.
Solution Approach 2:
The patent uses a composite structure combining multiple thin fabric layers crossed at specific angles (10°-90°, preferably 30°-86°) with resin matrix containing fillers (5-70% by volume). This composite approach creates homogeneous material properties across the thickness while maintaining structural integrity under dynamic loads greater than 60 MPa.
2Strength
If fabric strips are wound in multiple crossed layers to improve homogeneity and load behavior, then resistance to frictional stress and dynamic load behavior improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies filament winding technique where fabric strips are wound in multiple layers with controlled crossing angles (10°-90°). This dimensional approach to layer arrangement improves resistance to frictional stress and dynamic load behavior while the winding process itself provides a systematic method to manage the complexity of creating multi-layer crossed structures.
3Productivity
If fabric thickness is increased to reduce number of layers, then manufacturing is simpler, but risk of flow and delamination under dynamic load increases
Solution Approach 1:
Instead of using fewer thick fabric layers, the patent segments the total thickness into multiple thin layers (20-150 μm each). This segmentation prevents flow and delamination under dynamic loads while the efficient winding process maintains good manufacturing productivity.
Solution Approach 2:
The composite structure of multiple thin crossed layers with resin matrix and fillers creates a more reliable material that resists delamination under dynamic loads greater than 60 MPa, while the filament winding technique provides an efficient manufacturing process for creating this complex multi-layer structure.
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 enhances both dynamic and static load behavior by ensuring material homogeneity and increased resistance to wear, significantly extending the joint's operational life under high loads.
Implementation Method 1
self-lubricating joint element made from a composite material and operating under high dynamic loadings
Implementation Method 2
resistance to wear
Data Source
AI summary
The element is formed from the winding of a fabric of small thickness ranging between 20 μm and 150 μm and mixed with a resin containing fillers. The fabric has the form of strips having a width ranging between 5 mm and 200 mm, with the strips being crossed in several layers.