Conductive polymers as fatigue-damage indicators

1972 ◽  
Vol 12 (3) ◽  
pp. 124-129 ◽  
Author(s):  
J. W. Dally ◽  
G. A. Panizza
Keyword(s):  
Fatigue Damage ◽  
Conductive Polymers ◽  
Damage Indicators

scholarly journals Mechanical Behavior Evaluation of Tempcore and Hybrid Reinforcing Steel Bars via a Proposed Fatigue Damage Index in Long Terms

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 834
Author(s):  
Maria Basdeki ◽  
Charis Apostolopoulos
Keyword(s):  
Fatigue Damage ◽  
Mechanical Performance ◽  
Damage Index ◽  
Steel Reinforcement ◽  
Production Cycle ◽  
Reinforcing Bars ◽  
Dp Steel ◽  
Damage Indicators ◽  
Quality Material ◽  
Repeated Loads

As it is widely known, corrosion constitutes a major deterioration factor for reinforced concrete structures which are located in coastal areas. This phenomenon, combined with repeated loads and, especially, intense seismic events, negatively affect their useful service life. It is well known that the microstructure of steel reinforcing bars has a significant impact either on their corrosion resistance or on their fatigue life. In the present manuscript, an effort has been made to study the effect of corrosive factors on fatigue response for two types of steel reinforcement: Tempcore steel B reinforcing bars and a new-generation, dual-phase (DP) steel F reinforcement. The findings of this experimental study showed that DP steel reinforcement’s rate of degradation due to corrosion seemed apparently lighter than Tempcore B with respect to its capacity to bear repeated loads to a satisfactory degree after corrosion. For this purpose, based on a quality material index that characterizes the mechanical performance of materials, an extended damage material indicator for fatigue conditions is similarly proposed for evaluating and classifying these two types of rebars in terms of material quality and durability. The outcomes of this investigation demonstrated the feasibility of fatigue damage indicators in the production cycle as well as at different exposure times, once corrosion phenomena had left their mark in steel reinforcement.

scholarly journals DURABILITY OF A WELDED TRUSS UNDER CYCLIC LOADS

2021 ◽  
Vol 5 (41) ◽  
pp. 147
Author(s):  
M. Basara ◽  
Ya. Kovalchuk ◽  
N. Shynhera
Keyword(s):  
Computer Simulation ◽  
Fatigue Damage ◽  
Simulation Experiment ◽  
Fatigue Crack Initiation ◽  
Experimental Studies ◽  
Operating Mode ◽  
Butt Joint ◽  
Damage Indicators ◽  
Computer Simulation Experiment ◽  
Time Of Operation

The paper presents the results of experimental studies of the durability of a rectangular welded truss. The truss is made of profile pipes with butt joint nodes. A concentrated cyclic load is adopted for the construction, which corresponds to the operating mode of the roof truss with the ways for the bridge crane. The study was performed using the method of semi-natural and computer simulation experiment in ANSYS Workbench 17 environment. It was found that the loss of bearing capacity by the truss during operation occurs due to the fatigue crack initiation in the K-shaped node on the upper chord of the truss. The durability of the truss is determined by the ratio of the parameters of force and time of operation of the truss. The results of the semi-natural and computer simulation experiment were verified and the fatigue damage indicators coincided at the level of 5.7%.Keywords: welded truss, fatigue damage, truss nodes, durability of the truss.

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