Validation Study of Unnotched Charpy and Taylor-Anvil Impact Experiments using Kayenta

Kamojjala, Krishna¹  Lacy, Jeffrey¹  Chu, Henry S.¹  Brannon, Rebecca¹ 

[1] Idaho National Lab. (INL), Idaho Falls, ID (United States)

关键词: Charpy Impact;    Computational Mechanics;    Constitutive Model;    Damage Model;    Material Failure;    Taylor Anvil;    Validation;   

DOI  :  10.2172/1177236
RP-ID  :  INL/EXT--14-33981
PID  :  OSTI ID: 1177236

学科分类：数学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Validation of a single computational model with multiple available strain-to-failure fracture theories is presented through experimental tests and numerical simulations of the standardized unnotched Charpy and Taylor-anvil impact tests, both run using the same material model (Kayenta). Unnotched Charpy tests are performed on rolled homogeneous armor steel. The fracture patterns using Kayenta???s various failure options that include aleatory uncertainty and scale effects are compared against the experiments. Other quantities of interest include the average value of the absorbed energy and bend angle of the specimen. Taylor-anvil impact tests are performed on Ti6Al4V titanium alloy. The impact speeds of the specimen are 321 m/s and 393 m/s. The goal of the numerical work is to reproduce the damage patterns observed in the laboratory. For the numerical study, the Johnson-Cook failure model is used as the ductile fracture criterion, and aleatory uncertainty is applied to rate-dependence parameters to explore its effect on the fracture patterns.