Polyimide Fiber Resin Composite for Vibration Damping and Strength
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Solution Overview
Problem
Existing fiber-reinforced molded resin objects face a trade-off between high mechanical strength and vibration-damping, with rubber particles in epoxy resins reducing rigidity and strength, limiting their effectiveness in applications requiring both properties.
Innovation Solution
Incorporating polyimide fibers with specific diameter and volume content into the resin matrix, achieving a damping loss factor of 0.005 or more at 6400 Hz, along with tensile strength and modulus within certain ranges, to enhance vibration-damping without compromising mechanical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber particles are added to epoxy resin to improve vibration-damping, then vibration-damping increases, but rigidity and strength decrease
Solution Approach 1:
The invention changes the type of reinforcement from rubber particles to polyimide fibers with specific diameter (10.0-18.0 μm) and volume content (40-70%), achieving both high vibration-damping (damping loss factor ≥0.005) and high strength (tensile strength ≥3.0 GPa, tensile elastic modulus ≥80 GPa) through precise parameter control of the fiber reinforcement
Solution Approach 2:
The invention uses a composite material system consisting of polyimide fibers reinforced in an epoxy resin matrix, creating a fiber-reinforced composite that simultaneously provides high strength, high rigidity, and high vibration-damping properties, overcoming the limitations of rubber particle modification
2Strength
If fiber-reinforced molded resin objects are used to achieve high rigidity and strength, then mechanical characteristics improve, but vibration-damping may be compromised
Solution Approach 1:
The invention optimizes the fiber diameter to 10.0-18.0 μm and volume content to 40-70%, achieving a balance where the fibers provide structural strength while their specific dimensions and distribution enable effective vibration energy dissipation, resulting in damping loss factor ≥0.005
Solution Approach 2:
The polyimide fiber-reinforced epoxy resin composite creates a material system where the fiber reinforcement provides mechanical strength and the fiber-matrix interface and fiber distribution provide vibration-damping, achieving both high rigidity/strength and high vibration-damping simultaneously
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 fiber-reinforced molded resin objects exhibit improved vibration-damping and mechanical strength, suitable for reducing vibrations in transportation devices, enhancing golf club strikes, and improving earthquake resistance.
Implementation Method 1
The fiber-reinforced molded resin object has, at a measurement temperature of 23° C., a damping loss factor of 0.005 or more at a natural frequency of 6400 Hz or less
Implementation Method 2
The polyimide fiber in the fiber-reinforced molded resin object has a volume content in the range of 40% or more and 70% or less
Data Source
AI summary
An objective of the present invention is to provide a vibration-damping fiber-reinforced molded resin object having high mechanical characteristics and high vibration-damping. The fiber-reinforced molded resin object includes a polyimide fiber and a resin. The polyimide fiber has a fiber diameter in the range of 10.0 μm or more and 18.0 μm or less. The polyimide fiber in the fiber-reinforced molded resin object has a volume content in the range of 40% or more and 70% or less. The fiber-reinforced molded resin object has, when measured in an environment at 23° C., a damping loss factor of 0.005 or more at a natural frequency of 6400 Hz or less.