Validation of material models for puncture of 7075-T651 aluminum plate

Corona, Edmundo; Spletzer, Matthew; Lester, Brian T.; Fietek, Carter J.

doi:10.1016/j.ijsolstr.2022.111893

Validation of material models for puncture of 7075-T651 aluminum plate

Journal Article · Sat Aug 13 00:00:00 EDT 2022 · International Journal of Solids and Structures

DOI:https://doi.org/10.1016/j.ijsolstr.2022.111893· OSTI ID:1882632

Corona, Edmundo ^[1]; Spletzer, Matthew ^[1]; Lester, Brian T. ^[1]; Fietek, Carter J. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Plate puncture simulations are challenging computational tasks that require advanced material models including high strain rate and thermal-mechanical effects on both deformation and failure, plus finite element techniques capable of representing large deformations and material failure. The focus of this work is on the material issues, which require large sets of experiments, flexible material models and challenging calibration procedures. In this study, we consider the puncture of 12.7 mm thick, 7075-T651 aluminum alloy plates by a cylindrical punch with a hemispherical nose and diameter of 12.7 mm. The plasticity and ductile failure models were isotropic with calibration data obtained from uniaxial tension tests at different temperatures and strain rates plus quasi-static notched tension tests and shear-dominated tests described here. Sixteen puncture experiments were conducted to identify the threshold penetration energy, mode of puncture and punch acceleration during impact, The punch was mounted on a 139 kg mass and dropped on the plates with different impact speeds. Since the mass was the same in all tests, the quantity of interest was the impact speed. The axis and velocity of the punch were perpendicular to the plate surface. The mean threshold punch speed was 3.05 m/s, and the mode of failure was plugging by thermal-mechanical shear banding accompanied by scabbing fragments. Application of the material models in simulations of the tests yielded accurate estimates of the threshold puncture speed and of the mode of failure. Time histories of the punch acceleration compared well between simulation and test. Remarkably, the success of the simulations occurred in spite of even the smallest element used being larger than the width of the shear bands.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1882632

Report Number(s):: SAND2022-10786J; 708954

Journal Information:: International Journal of Solids and Structures, Journal Name: International Journal of Solids and Structures Vol. 257; ISSN 0020-7683

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Al 7075
Calibration
Ductile failure
Finite elements
Plasticity
Puncture
Thermal-mechanical

Validation of material models for puncture of 7075-T651 aluminum plate

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References (19)

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