Abstract
The structural parts of construction machinery mostly fail due to impact load, but current research on the failure behavior of the impact load has not established a complete theoretical system. Based on wave theory and fracture mechanics, this paper analyzed the wave behavior of shock stress waves and established a model of shock stress wave propagation. Given the dynamic response behavior of the stress and strain field at the crack tip, dynamic fracture mechanics theory was used to solve the dynamic fracture strength stress factor and evaluate the dynamic fracture performance of the structure with crack damage under shock waves. Through dynamic response analysis and numerical calculation of the typical SHPB (split Hopkinson pressure bar) test standard compact tension (CT) specimens under the short-term strong shock stress wave, the stress and strain evolution law of the material under the shock wave was analyzed, and the correlation of the shock stress wave was verified. This research work can meet the requirements of engineering design and has practical engineering significance, playing an important role in material safety design.
Highlights
The in-depth study of the dynamic response behavior and failure characteristics of metal materials under impact loads has become the frontier of current scientific research [3]
Thethe types and properties of the waves mainly depend on the relationship between the direction of particle different kinds of stress waves that can propagate through a material
Due to the limitation of linear elastic fracture mechanics in solving the fracture problem of elastic–plastic metal materials, when the elastic–plastic materials and components with cracks are subjected to an external load, the stress concentration near the crack tip is bound to appear, and the value of stress concentration is very large, which leads to the plastic zone at the crack tip
Summary
The establishment of an effective model of stress wave propagation to accurately characterize the behavior of strain waves is extremely important for the safety design of structural materials against impact and the reliability of service. Considering the mutual coupling effect of stress and strain fields in the crack tip area during the propagation of shock stress waves, it is very important to establish a model that can characterize the propagation of stress waves at the crack [28,29] On this basis, the mechanical behavior of cracks under impact load and the propagation law of stress waves near the cracks are studied [30,31,32,33]. The interaction between the propagation behavior of stress waves and the dynamic evolution of cracking was analyzed
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