Magnetostrictive Composite Composition for Fatigue-Resistant Actuation
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Solution Overview
Problem
Existing magnetostrictive composite materials face challenges with brittleness, making them difficult to withstand repeated stress loading, and require complex operations for wire arrangement, while materials like Terfenol-D and Galfenol have insufficient fatigue properties.
Innovation Solution
A novel magnetostrictive composite material is developed using a composition with a powdery magnetostrictive material dispersed in a base material cured by radical polymerization, comprising a compound with polymerizable groups, a radical polymerization initiator, and a thermosetting elastomer with specific properties to enhance mechanical strength and magnetostrictive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire consisting of iron-based magnetostrictive alloy is embedded in base material as filler, then magnetostrictive properties are achieved, but complicated operations are required for wire arrangement
Solution Approach 1:
The invention divides the magnetostrictive material into fine particles instead of using continuous wires. This segmentation allows the material to be easily dispersed and mixed with the base material without requiring complex wire arrangement operations, while still maintaining magnetostrictive properties through the collective effect of numerous particles
Solution Approach 2:
The invention changes the physical form parameter of the magnetostrictive material from wire/rod shape to fine particle shape. This parameter change fundamentally simplifies the manufacturing process by enabling simple mixing and dispersion operations instead of precise wire arrangement, while the magnetostrictive functionality is preserved through appropriate particle size control and concentration
2Reliability
If magnetostrictive material with high magnetostrictive properties (Terfenol-D, Galfenol) is used, then magnetostrictive properties are improved, but fatigue properties become insufficient due to brittleness
Solution Approach 1:
The invention creates a composite material system where fine particles of magnetostrictive material are dispersed in a flexible base material. This composite structure allows the base material to absorb mechanical stresses and protect the brittle magnetostrictive particles, enabling the system to withstand repeated stress loading while maintaining high magnetostrictive properties
Solution Approach 2:
The invention assigns different functional qualities to different components: the magnetostrictive particles provide local magnetostrictive functionality, while the base material provides local mechanical flexibility and stress distribution. This division of functional quality allows each component to optimize its role without compromising the other
3Strength
If Fe-Co alloy is used instead of Terfenol-D or Galfenol, then mechanical properties are slightly improved, but magnetostrictive properties become inferior and fatigue properties remain insufficient
Solution Approach 1:
The invention uses a composite structure where Fe-Co alloy particles provide both magnetostrictive properties and improved mechanical strength compared to pure Terfenol-D or Galfenol. The base material compensates for any remaining brittleness issues, creating a balanced system with adequate magnetostrictive properties, improved mechanical strength, and sufficient fatigue resistance
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 new composite material exhibits both positive and negative magnetostriction, improving its ability to withstand repeated stress loading and simplifying the manufacturing process, while maintaining effective magnetostrictive properties.
Implementation Method 1
a base material which is cured by a radical polymerization
Implementation Method 2
A magnetostrictive material is a material which is slightly deformed in a case where a magnetic field is applied, and the phenomenon of this deformation is called 'magnetostriction'
Implementation Method 3
in a case where force is applied to the magnetostrictive material to be deformed, an inverse magnetostriction phenomenon occurs in which a magnetic field inside the material changes
Data Source
AI summary
Provided is a composition having magnetostrictive properties, which contains a component (P): a compound having a polymerizable group, a component (M): a powdery magnetostrictive material, and a component (R): a radical polymerization initiator.