Dynamic characteristics of Mn-Cu high damping alloy subjected to impact load

Abstract

Mn-Cu high damping alloy is a twin-type damping alloy. Owing to its martensite twin structure at room temperature, it can convert vibration energy into heat energy, thereby reducing vibration. Although essentially a nonlinear elastic material, Mn-Cu damping alloys are treated as linear elastic materials in current engineering practice. However, introducing a constant damping coefficient alone will produce significant errors when modeling vibration reduction characteristics of the material, especially under impact loading. In this study, vibration test was performed on Mn-Cu damping alloy cantilever beam subjected to an impact load and deviation between the test result and the one of existing modeling method was analyzed. A generalized fractional-order Maxwell model was established to describe the nonlinear constitutive relation of the Mn-Cu damping alloy. Then, the model was extended to the three-dimensional state and a secondary development was performed. Finally, various applications for the damping alloy were explored and the effects of the damping alloy on the vibration characteristics of composite cantilever beam structures subjected to impact loads were investigated with the aim of better understanding the dynamic characteristics and improving the effectiveness of vibration reduction applications using Mn-Cu damping alloy in the future.

Microstructure and mechanical properties of Mn-Cu based damping alloy fabricated by laser melting deposition

“…The micro twin interface generated by martensitic transformation in the alloy moves reversibly under the periodic stress, causing the static lag of strain and stress phase. Then the vibration energy will be dissipated by transforming into heat energy, so as to the damping effect is achieved [1,2] . Yin F X developed commercial M2052(Mn-20Cu-5Ni-2Fe, at%) alloy and it has been widely used [3] .…”