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joannall
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many references tell that the dynamic stiffness will reduce when vibration amplitude increases. And the experimental result is just so. But why there is such rule?who can explain it theoretically?
Dynamic stiffness is a measure of the relationship between the applied force and the resulting displacement of a structure or material under dynamic loading conditions. It is typically expressed in units of force per unit displacement, such as N/m or lb/in.
The dynamic stiffness of a material or structure is affected by several factors, including the material properties (such as elasticity and density), the geometry and dimensions of the structure, and the frequency and amplitude of the applied vibrations.
The relationship between dynamic stiffness and vibration amplitude is inverse: as the dynamic stiffness of a material or structure increases, the vibration amplitude decreases. This means that stiffer materials or structures will experience smaller vibrations under the same loading conditions compared to more flexible materials or structures.
Yes, dynamic stiffness can be measured through various experimental methods, such as dynamic mechanical analysis (DMA) or modal analysis. These techniques involve subjecting a material or structure to a range of dynamic loading conditions and measuring the resulting displacement or response.
Dynamic stiffness is an important factor in the design and analysis of structures and materials that are subject to dynamic loading, such as buildings, bridges, and machinery. It is used to ensure the structural integrity and stability of these systems and to optimize their performance under varying loading conditions.