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Extension of Flow Behaviour and Damage Models for Cast Iron Alloys with Strain Rate Effect

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Cast iron alloys with low production cost and quite good mechanical properties are widely used in the automotive industry.To study the mechanical behavior of a typical ductile cast iron(GJS-450)with nodular graphite,uni-axial quasi-static and dynamic tensile tests at strain rates of 10-4,1,10,100,and 250 s-1 were carried out.In order to inves-tigate the influence of stress state on the deformation and fracture parameters,specimens with various geometries were used in the experiments.Stress strain curves and fracture strains of the GJS-450 alloy in the strain rate range of 10-4 to 250 s-1 were obtained.A strain rate-dependent plastic flow model was proposed to describe the mechani-cal behavior in the corresponding strain-rate range.The available damage model was extended to take the strain rate into account and calibrated based on the analysis of local fracture strains.Simulations with the proposed plastic flow model and the damage model were conducted to observe the deformation and fracture process.The results show that the strain rate has obviously nonlinear effects on the yield stress and fracture strain of GJS-450 alloys.The predictions with the proposed plastic flow and damage models at various strain rates agree well with the experi-mental results,which illustrates that the rate-dependent plastic flow and damage models can be used to describe the mechanical behavior of cast iron alloys at elevated strain rates.The proposed plastic flow and damage modelscan be used to describe the deformation and fracture analysis of materials with similar properties.

Dynamic behavior of materialsStrain rate dependencyDamage modelVoce modelCast iron

Chuang Liu、Dongzhi Sun、Xianfeng Zhang、Florence Andrieux、Tobias Gersterc

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School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

Fraunhofer Institute for Mechanics of Materials(IWM),79108 Freiburg,Germany

Fraunhofer Institute for High Speed Dynamics,Ernst-Mach-Institute(EMI),79104 Freiburg,Germany

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFederal Ministry of Economic Affairs and Energy(BMWi)via the German Federation of Industrial Research Associations'Otto von Forschungsvereinigung Automobiltechnik e.V.(FAT)

12202205U1730101IGF-Nr.19567N

2024

10.1186/s10033-024-01047-z

中国机械工程学报
中国机械工程学会

中国机械工程学报

CSTPCD
影响因子：0.765
ISSN：1000-9345
年,卷(期)：2024.37(3)