Abstract
Ships are always prone to fatigue through high periodic loads, usually caused by waves and changing load conditions. So, fatigue is an important factor in design. One of the reasons for fatigue in welding parts is variable bending loads. In this paper, a specimen of low-carbon steel T-Bar profiles is used, along with plates of the same type of steel that have been welded by the manual electrode welding process. To determine the distribution of static and dynamic forces created by welding, the specimens were subjected to bending (three-point loading) and tensile tests, and finally fatigue tests. The T-Bar Steel profile has more tolerance for fatigue loads than welded. The load T-Bar profile has not failed until the two million cycles, while the welding specimen has failed in about 3×105 cycles. Finally, strong penetrating welds should be used if a stronger welding joint is required.
Highlights
The fracture phenomenon is a destructive and accidental failures phenomenon in the design of structures
This paper proposes a mixed mechanical-metrological approachable to account for the three-dimensional Fractography damage in samples subjected to fatigue bending loading histories based on the system dynamics
Connecting the vertical plate to the bottom plate can act as a weak point in vibrational cycles
Summary
The fracture phenomenon is a destructive and accidental failures phenomenon in the design of structures. It is necessary that the relationship between external stress and the crack length in part is the material's properties and is very important in designing structures resistant to failure and control of this phenomenon. The history of engineering structures has witnessed numerous failures in machinery, automotive, welding structures, aircraft. These fatigue failures have led to a large number of accidents as well as significant economic losses. In the course of comprehensive research and practical experiments, a great deal of knowledge has been gained about fatigue in structures and the process of fatigue. One of the most important causes of disability and failure of parts
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