A review on the oscillation phenomenon of stress strain curve of material under impact loading
The stress strain curves of materials obtained under impact loading generally exhibit significant oscillations.For a long time,it has been challenging to determine the authenticity of the oscillations,that is,it is uncertain whether the oscillations are intrinsic characteristics of the sample material or the influence of pure mechanical loading.Therefore,the oscillation of the curve is often not directly eliminated from the true stress strain curve.However,the existence of the oscillation conceals the real material response,making it difficult to accurately determine the dynamic yield strength of the material.It also hampers the establishment of the dynamic constitutive relationship of the material and the accuracy of its parameters.As a result,this has a negative impact on the optimal design and safety reliability of major equipment under impact load.Considering the issue of oscillation,which has long been a problem for scientific researchers and engineering technicians,this paper reviews the progress in the study of the oscillation phenomenon of the stress strain curve of materials under impact loading.Firstly,the reasons for the oscillation in the dynamic test curve are analyzed from the perspectives of loading system design,stress wave propagation,and sample deformation distribution.Secondly,methods of suppressing or eliminating the oscillation phenomenon are discussed primarily based on the causes of oscillation.Lastly,the current research is summarized,highlighting the outstanding issues,and recommendations are provided for future development.
NETL
NSTL
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