Tham khảo tài liệu 'volume 17 - nondestructive evaluation and quality control part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fig. 8 Ultrasonic spectrum analyzer output showing change in transmitted intensity with density of green compact. Source Ref 11 Figure 9 shows that the velocity of ultrasonic waves in green compacts is about half the velocity in sintered compacts and that it is essentially invariant with density Ref 13 . It has also been shown that the velocity of ultrasound in green parts is highly anisotropic and that the experimental reproducibility is very poor Fig. 10 . It has been proposed that the anisotropy in velocity is due to the orientation of porosity Ref 15 . Fig. 9 Effect of density on ultrasonic velocity in green and sintered cylindrical Ancorsteel 1000-B specimens. Source Ref .
