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| 2. |
- Talreja, Ramesh
(författare)
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Fatigue reliability under multiple-amplitude loads
- 1979
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Ingår i: Engineering Fracture Mechanics. - : Elsevier BV. - 0013-7944 .- 1873-7315. ; 11:4, s. 839-849
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Tidskriftsartikel (refereegranskat)abstract
- method to determine the fatigue of structures subjected to multiple-amplitude loads is presented. Unlike the more common cumulative damage methods, which are usually based on fatigue life data, the proposed method is based on tensile strength data. Assuming the Weibull distribution for the initial tensile strength and the fatigue life, the probability distributions for the residual tensile strength in both the crack initiation and the crack propagation stages of fatigue are determined. The method is illustrated for two-amplitude loads by means of experimental results obtained by testing specimens of a structural steel and is shown to be more accurate than the Palmgren-Miner cumulative damage method
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| 3. |
- Talreja, Ramesh
(författare)
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On fatigue life under stationary Gaussian random loads
- 1973
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Ingår i: Engineering Fracture Mechanics. - : Elsevier BV. - 0013-7944 .- 1873-7315. ; 5:4, s. 993-1007
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Tidskriftsartikel (refereegranskat)abstract
- Load parameters for a stationary Gaussian random load are taken as the location, scale and shape parameters of its power spectrum. The centre frequency of a power spectrum is proposed as a measure of fatigue life. A fatigue life function, formulated in terms of the load parameters, is evaluated from the test results obtained by fatigue testing a structural steel under six different power spectral shapes. The concept of a shape operator is employed to correlate fatigue lives under different power spectral shapes.
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| 4. |
- Talreja, Ramesh
(författare)
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On fatigue reliability under random loads
- 1979
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Ingår i: Engineering Fracture Mechanics. - : Elsevier BV. - 0013-7944 .- 1873-7315. ; 11:4, s. 717-732
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Tidskriftsartikel (refereegranskat)abstract
- We consider the problem of estimating the probability of survival (non-failure) and the probability of safe operation (strength greater than a limiting value) of structures subjected to random loads. These probabilities are formulated in terms of the probability distributions of the loads and the material strength. For the material strength, the Weibull distribution is assumed, the parameters of which are estimated by a statistical analysis of the experimental tensile strength of steel specimens subjected to different periods of random loads. The statistical analysis shows that, with the application of random loads, the initial homogeneous distribution of strength changes to a two-component distribution, reflecting the two-stage fatigue damage. In the crack initiation stage, the strength increases initially and then decreases, while an abrupt decrease of strength is seen in the crack propagation stage. The consequences of this behaviour on the fatigue reliability are discussed
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| 5. |
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| 6. |
- Talreja, Ramesh
(författare)
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Stress-strain behavior of a Cr-mo-v steel under variable amplitude loads
- 1976
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Ingår i: Proceedings of the Second International Conference on Mechanical Behavior of Materials, 16 - 20 August 1976, Sheraton-Boston Hotel, Boston, Massachusetts. - Metals Park, Ohio : ASM International.
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Konferensbidrag (refereegranskat)abstract
- Recent viscoplastic theories have been successful in describing strain behavior under variable loads. However, convincing experimental evidence was lacking to elucidate the essentially viscoplastic nature of the inelastic behavior of metals. The paper discusses an investigation in which the inelastic behavior of a Cr-Mo-V steel was studied in uniaxial stress at room temperatures. At high stresses, the viscous strains are found to be significant and revived with each application following a prestrain. The laws of the dependence of viscous strains on stress and prestrain are determined experimentally.
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