Metal-Damping Composite Structure for Thermal Distortion Suppression
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Solution Overview
Problem
Conventional composites of metal members and vibration damping materials face issues with thermal expansion mismatch, leading to internal stresses and surface distortions due to different coefficients of linear expansion, resulting in appearance defects such as unevenness and wrinkles when temperature rises.
Innovation Solution
A composite configuration where a vibration damping material is sandwiched between two metal members without being bonded to them, using an intermediate member like a metal, plastic, rubber, or foam material to manage thermal expansion and reduce internal stresses, and the metal members are bonded only where the damping material is not present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration damping material is bonded to a metal member via adhesive, then the vibration damping performance is improved, but internal stresses and surface distortions occur due to thermal expansion mismatch
Solution Approach 1:
The patent introduces an intermediate member between the vibration damping material and the metal member. This intermediate member has a coefficient of linear expansion that falls between those of the metal member and the vibration damping material, thereby reducing the thermal expansion mismatch and preventing internal stresses and surface distortions while maintaining vibration damping performance.
2Stability of the object's composition
If a vibration damping material is bonded to a metal member, then the composite structure is formed, but the difference in thermal expansion coefficients causes appearance defects at elevated temperatures
Solution Approach 1:
The intermediate member serves as a mediator that accommodates the thermal expansion differences between the metal member and vibration damping material. By selecting a material with an intermediate coefficient of linear expansion, the patent prevents the generation of internal stresses that would otherwise cause appearance defects such as unevenness and wrinkles on the metal member surface.
3Strength
If strong adhesives and curing processes are used to bond metal members and vibration damping materials, then the bonding strength is improved, but production costs and process complexity increase
Solution Approach 1:
The intermediate member enables a simplified bonding approach. Instead of requiring strong adhesives and complex curing processes, the intermediate member with matched thermal expansion properties allows for mechanical bonding or simpler joining methods, thereby reducing production costs and process complexity while maintaining sufficient bonding strength.
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
This configuration effectively suppresses internal stresses and surface distortions, maintaining the structural integrity and appearance of the composite even at elevated temperatures, reducing production costs by eliminating the need for strong adhesives and curing processes.
Implementation Method 1
vibration damping material
Implementation Method 2
a loss coefficient of the vibration damping material at 25° C. may be 0.01 or more
Implementation Method 3
since the metal member and the vibration damping material have different coefficients of linear expansion, when the temperature rises, misfitting of thermal expansion coefficients between the metal member and the vibration damping material causes internal stresses
Data Source
AI summary
A composite consisting of a metal member and a vibration damping material, wherein the occurrence of poor appearance when the temperature rises is suppressed. The composite of the present disclosure includes a first metal member, a second metal member, and a vibration damping material excluding fiber-reinforced plastics. The vibration damping material is arranged in at least a part of a portion where the first metal member and the second metal member overlap and is sandwiched between the first metal member and the second metal member, and there is no bonding between at least one of the first metal member and the second metal member and the vibration damping material.