scholarly journals DUCTILITY AND CUMULATIVE DAMAGE EVALUATION OF H-SHAPED STEEL BEAMS SUBJECTED TO PLASTIC CYCLIC LOADINGS

2013 ◽  
Vol 78 (691) ◽  
pp. 1603-1612
Author(s):  
Takumi ITO ◽  
Kenjiro MORI
Keyword(s):  
Cumulative Damage ◽  
Steel Beams ◽  
Damage Evaluation

scholarly journals Cumulative Damage Evaluation under Fatigue Loading

2008 ◽  
Vol 13-14 ◽  
pp. 141-150 ◽  
Author(s):  
L.E. Granda Marroquín ◽  
Luis Héctor Hernández-Gómez ◽  
G. Urriolagoitia-Calderón ◽  
G. Urriolagoitia-Sosa ◽  
E.A. Merchán-Cruz
Keyword(s):  
Damage Model ◽  
Fatigue Loading ◽  
Fatigue Tests ◽  
Cumulative Damage ◽  
Damage Evaluation ◽  
Strain Gages ◽  
Damage Rate ◽  
Heat Treated ◽  
History Of ◽  
Nonlinear Damage Model

The goal of this paper is to present the results obtained from damage evaluation in automotive axles, which are under torsion fatigue. For this purpose, a Nonlinear Damage Model is used. The mentioned shafts have to satisfy geometry requirements and their material has to be heat treated in order to improve their performance. One has to keep in mind that fatigue strength depends on material properties and geometry. In order to make a precise evaluation of the accumulated damage, the manufactured shafts were tested. In the first instance, the mechanical properties of the material were evaluated with static torsion tests. In the next step, the S-N curves were obtained with torsion fatigue tests. In all these cases, temperature was controlled. Experimental data at different load levels was gathered with strain gages in conjunction with a data acquisition system. The life cycle history of each tested shaft was stored and with this experimental evidence, damage curves were obtained and the cumulative damage of the axle was established. With these damage curves, it is possible to define the relation between damage rate and life for different stress levels.

scholarly journals A Step-by-Step Damage Identification Method Based on Frequency Response Function and Cross Signature Assurance Criterion

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1029
Author(s):  
Jiawang Zhan ◽  
Fei Zhang ◽  
Mohammad Siahkouhi
Keyword(s):  
Frequency Response ◽  
Response Function ◽  
Frequency Response Function ◽  
Evaluation Method ◽  
Damage Identification ◽  
Model Updating ◽  
Steel Beams ◽  
Damage Evaluation ◽  
Frequency Range ◽  
Identification Procedure

This paper aims to present a method for quantitative damage identification of a simply supported beam, which integrates the frequency response function (FRF) and model updating. The objective function is established using the cross-signature assurance criterion (CSAC) indices of the FRFs between the measurement points and the natural frequency. The CSAC index in the frequency range between the first two frequencies is found to be sensitive to damage. The proposed identification procedure is tried to identify the single and multiple damages. To verify the effectiveness of the method, numerical simulation and laboratory testing were conducted on some model steel beams with simulated damage by cross-cut sections, and the identification results were compared with the real ones. The analysis results show that the proposed damage evaluation method is insensitive to the systematic test errors and is able to locate and quantify the damage within the beam structures step by step.

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