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Tham khảo tài liệu 'nondestructive evaluation and quality control (1998) part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Spin pit strain gage test Analytical stress prediction techniques verified Malerials rest program Engine thermal surveys Measures rotor temperatures and boundary conditions Analytical correlation and verification Crack growth verification specimen tests Critical location of each of the rotating components represented Mission loadings Stress fields duplicated Manufacturing features dupíỉcaĩed Engine residual life tests Damage tolerance spin pit tests Full -scale preflawed components Fig. 8 Residual life analysis and test procedure A typical test configuration for a cyclic spin test is shown in Fig. 9 and typical empirical data are shown in Fig. 10 11 12. Verification requirements may also include engine test with components that are preflawed or cracked in critical locations to determine the effects of the real environment temperature and gradient vibration and so on . Such tests must be closely controlled and monitored using the inspection requirements planned for service engines to ensure safety of the test engine. Fig. 9 Typical setup for a cyclic spin test heated spin pit of turbine rotor. Arrows indicate critical locations that were preflawed to simulate the worst expected damage. Fig. 10 Crack progagation as influenced by increases in three parameters. a Frequency f. b Stress ratio R. c Temperature T. The variable K is the calculated stress at the crack tip. .
