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通过改变低频振动加载条件,研究了振幅(0.01,0.05和0.1 mm)、频率(10,20和30 Hz)、进给速率(0.01,0.05和0.1 mm·s~(-1))和试样尺寸(Ф1,Ф2和Ф3 mm)对T2紫铜室温压缩变形行为的影响。实验结果表明,振幅对紫铜压缩变形过程的影响最为显著,随着振幅增加,成形载荷呈现较大幅度的降低;不同尺寸试样的实验结果表明,低频振动加载模式下存在明显的尺寸效应,随着试样尺寸减小,成形载荷降幅增大,晶粒尺寸减小。分析认为,振动条件下的变形为动态加载变形,应力的叠加使得内应力提高,并导致所需成形载荷降低。大振幅和小尺寸条件下,实际应变速率更大,能够产生更强的应力叠加,造成成形载荷降幅较大。
By changing the conditions of low frequency vibration loading, the amplitude (0.01,0.05 and 0.1 mm), the frequency (10,20 and 30 Hz), the feed rate (0.01,0.05 and 0.1 mm · s ~ (-1) Effect of Size (Ф1, Ф2 and Ф3 mm) on Compressive Deformation Behavior of T2 Copper at Room Temperature. The experimental results show that the amplitude has the most significant effect on the compressive deformation of copper. With the increase of the amplitude, the forming load decreases greatly. The experimental results of different size samples show that there is a clear size effect under low frequency vibration loading mode The sample size decreases, the forming load decreases, the grain size decreases. The analysis shows that the deformation under vibration is dynamic loading deformation. The superposition of stress leads to the increase of internal stress and the decrease of the required forming load. Under the conditions of large amplitude and small size, the actual strain rate is larger, which can result in stronger stress superposition, resulting in a larger drop of forming load.