کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
776467 1464075 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Predicting ballistic impact failure of aluminium 6061-T6 with the rate-independent Bao–Wierzbicki fracture model
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Predicting ballistic impact failure of aluminium 6061-T6 with the rate-independent Bao–Wierzbicki fracture model
چکیده انگلیسی


• An experimental programme including multi axial tests on specimens in Al6061-T6 with different geometry.
• Calibration of the constitutive law and two ductile damage criteria: Bao–Wierzbicki and Modified Mohr–Coulomb.
• Assessment of transferability of the calibrated failure criteria.
• Assessment of the calibration parameters in a ballistic impact case.

The main objective of the paper is to exploit a dedicated material calibration to predict an extreme loading condition: the damage of a helicopter tail rotor transmission shaft due to a small arm ballistic impact. A typical material point in the damage area undergoes to complex stress and strain history, starting from a large compressive stresses through shear deformation during crack extension all the way to the tensile fracture of the remaining ligament. The plasticity and the fracture characterization require to perform material tests covering the wide range of stress state. Therefore, a part of the paper is devoted to the description and analysis of plasticity and fracture test of different type of specimens. This includes test on round smooth and notched specimens under combined torsion/tension-compression, flat dog-bone and a curved tensile specimen cut from the wall of the shaft. The test data have been used to calibrate the phenomenological Modified Mohr-Coulomb model and the empirical Bao–Wierzbicki fracture models. The result of the numerical simulation of the projectile impact was then compared with the experiments on the ballistic impact of 7.62 ball projectile against the helicopter shaft. A very good agreement was found for both damage shape and residual velocity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Impact Engineering - Volume 76, February 2015, Pages 207–220
نویسندگان
, , , ,