التفاصيل البيبلوغرافية
| العنوان: |
Material Parameters in Constitutive Equation for Plastic Deformation at a High Strain Rate Estimated by High-Velocity Microparticle Collisions. |
| المؤلفون: |
Komine, Ryoma, Yasuda, Shotaro, Kajihara, Miki, Yonezu, Akio |
| المصدر: |
Journal of Materials Engineering & Performance; Jun2023, Vol. 32 Issue 12, p5627-5637, 11p |
| مصطلحات موضوعية: |
MATERIAL plasticity, STRAIN rate, STRAINS & stresses (Mechanics), HOPKINSON bars (Testing), SURFACE strains, FINITE element method |
| مستخلص: |
Plastic deformation behavior of metallic materials is well known to depend on length and time scales due to dislocation motions of materials, and such size and strain rate effects should be investigated by experimental testing. The split Hopkinson pressure bar test is a conventional testing method with a high strain rate, reaching maximum strain rates of up to 103 and 104 s−1. An experiment with a considerably higher strain rate is still challenging. For higher strain rates (~ 107 s−1), an experimental method for conducting microparticle collisions was developed in this study to effect high-strain-rate deformation on the target material surface. This was referred to as the laser-induced projectile impact test (LIPIT), which corresponds to the impact indentation test. Because of laser ablation, we successfully projected microparticles, resulting in particle collisions with the material surface at a higher strain rate. By changing the laser energy, the projectile velocity of particles was made fast, and the indentation crater depth was significantly changed. In addition, the finite element method was conducted to simulate plastic deformation behavior due to particle collision at a high strain rate; hence, plastic deformation at the microscale under a higher strain rate could be investigated. Two metallic materials, i.e., pure copper and pure iron, were investigated. By the combination of LIPIT and indentation test, we identified the constitutive equation for the plastic deformation of two metals, covering a wide range of strain rates (10−1-107 s−1). [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |