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

Technical Report · Sun Mar 01 00:00:00 EST 2015

DOI:https://doi.org/10.2172/1177236· OSTI ID:1177236

Kamojjala, Krishna ^[1]; Lacy, Jeffrey ^[1]; Chu, Henry S. ^[1]; Brannon, Rebecca ^[1]

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

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.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC07-05ID14517
• OSTI ID: 1177236
• Report Number(s): INL/EXT-14-33981
• Country of Publication: United States
• Language: English

Related Subjects

97 MATHEMATICS AND COMPUTING
Charpy Impact
Computational Mechanics
Constitutive Model
Damage Model
Material Failure
Taylor Anvil
Validation