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Abstract:
A number of test parameters, including the relative magnitudes of loads, their precise sequence, cycle hold times, environment, and material thickness, influence the effect of load interactions on fatigue crack propagation in metals. Some experiments on the influence of material thickness are described. The delay in crack growth caused by a single overload increased by a factor of 8.5 for 2024-T3 aluminum alloy specimens when the thickness was decreased from 6.4 mm to 1.6 mm. The practical importance of this effect is emphasized. Various proposed mechanisms of load interaction are described as well as models for quantitative predictions. It is concluded that satisfactory prediction of interaction effects will require some materials information, obtainable only by test.
| Description: |
Technical Memorandum |
| Pages: |
37 |
| Report Date: |
AUG 76 |
| Report Number: |
D769901 |
Report Unavailable |
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