Adiabatic shear band(ASB), as the precursor to catastrophic material failure, is of great significance in the research of impact resistance. This study investigated the adiabatic shear behavior of 12Cr1MoV steel under...Adiabatic shear band(ASB), as the precursor to catastrophic material failure, is of great significance in the research of impact resistance. This study investigated the adiabatic shear behavior of 12Cr1MoV steel under high-velocity impact from fragment-simulating projectile(FSP) using high-speed impact tests, numerical simulations, and scanning electron microscopy. The results demonstrated that the flat and wedge-shaped segments of the FSP experience different stress conditions and temperature fields during penetration. The asymmetry of the projectile has a pronounced effect on the morphology of the ASB. Two major failure modes were identified during the penetration process: tensile failure and shear failure, with pearlite exhibiting strengthening effects under both loading conditions. The ASB developed distinct microstructural characteristics with increasing impact velocity, exhibiting apparent sensitivity to temperatures and strain rates. Finally, the investigation of the ASB branches revealed the mechanisms underlying ASB formation and the initiation of catastrophic cracking.展开更多
基金support on financial support of the National Natural Science Foundation of China (grant number 12172337,11702257)the Fundamental Research Program of Shanxi Province (No.20210302123022)+1 种基金the Yunan Fundamental Research Projects (No.202501CF070200)Shanxi Province 2024 Graduate Education Innovation Program (2024KY627)。
文摘Adiabatic shear band(ASB), as the precursor to catastrophic material failure, is of great significance in the research of impact resistance. This study investigated the adiabatic shear behavior of 12Cr1MoV steel under high-velocity impact from fragment-simulating projectile(FSP) using high-speed impact tests, numerical simulations, and scanning electron microscopy. The results demonstrated that the flat and wedge-shaped segments of the FSP experience different stress conditions and temperature fields during penetration. The asymmetry of the projectile has a pronounced effect on the morphology of the ASB. Two major failure modes were identified during the penetration process: tensile failure and shear failure, with pearlite exhibiting strengthening effects under both loading conditions. The ASB developed distinct microstructural characteristics with increasing impact velocity, exhibiting apparent sensitivity to temperatures and strain rates. Finally, the investigation of the ASB branches revealed the mechanisms underlying ASB formation and the initiation of catastrophic cracking.
