tailieunhanh - Volume 01 - Properties and Selection Irons, Steels, and High-Performance Alloys Episode 9

Tham khảo tài liệu 'volume 01 - properties and selection irons, steels, and high-performance alloys episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | hyperbola Stress h Fig. 30 Fatigue data a showing sequence effects for notched-specimen and smooth-specimen simulations 2024-T4 aluminum Kf . Load histories A and B have a similar cyclic load pattern dS2 but have slightly different initial transients AS1 with either b a tensile leading edge first stress peak at AS1 2 or c a compressive leading edge first stress peak at -AS1 2 . The sequence effect on fatigue life a becomes more pronounced as AS2 smaller. Source Ref 21 V 1 V Notched specimen constant 1 Notched-specimen X amplituc at ủS ie 0 Smooth-specimen simulation toad Notched-specimen load history B Ó Smooth-So ecimen simulation history B load Load history A HA -fV Loacf history Ẽ o NSuber control hyperbola Ultimately the fatigue analyst will be required to include and correlate a number of material shape processing and load factors in order to identify the critical locations within a part and to describe the local stress-strain response at those critical locations. The ability to anticipate pertinent factors will greatly affect the final accuracy of the life prediction. Load data gathering is one remaining topic that must be included in any discussion of fatigue. Reference 21 discusses three load histories suspension transmission and bracket vibration that typify loads found in the ground vehicle industry. Additionally there are vastly different histories unique to other industries like the so-called ground-air-ground cycle in aeronautics. Without the ability to completely and accurately characterize anticipated and occasionally unanticipated customer use and resultant loads the analyst will not be able to predict accurately the suitability of a new or revised design. The last several years have seen a major change in the ability to gather customer or simulated customer load data. Testing methods have progressed from bulky multichannel analogue tape recorders where it took days or weeks before results were available through portable frequency-modulated .

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