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Related Concept Videos

Fatigue01:21

Fatigue

279
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
279
Design Consideration01:22

Design Consideration

356
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
356
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

318
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
318
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

230
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
230
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

253
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
253
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

1.1K
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
1.1K

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Experimental and Numerical Investigations on High Performance SFRC: Cyclic Tensile Loading and Fatigue.

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Summary

High-strength short steel fibers enhance high-performance concrete

Keywords:
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Area of Science:

  • Materials Science
  • Civil Engineering
  • Structural Engineering

Background:

  • High-performance concrete (HPC) is susceptible to degradation under static and cyclic loading.
  • Controlling crack propagation and improving material ductility are critical for enhancing concrete durability.

Purpose of the Study:

  • To experimentally and numerically investigate the efficacy of high-strength short steel fibers in mitigating degradation in high-performance concrete.
  • To assess the impact of steel fibers on concrete's mechanical behavior, particularly post-cracking performance and cyclic loading response.

Main Methods:

  • Static and cyclic tensile tests were performed on high-performance concrete (HPC) and high-performance steel fiber-reinforced concrete (HPSFRC) specimens up to 100,000 cycles.
  • Microscopic examinations were conducted to analyze crack patterns.
  • Displacement-controlled crack opening tests and numerical simulations were employed to evaluate fiber influence in the cracked state.

Main Results:

  • HPSFRC exhibited a lower strain increase rate and strain stagnation under cyclic loading compared to HPC.
  • Microscopic analysis revealed more numerous but smaller surface area microcracks in HPSFRC.
  • Steel fibers did not significantly alter ultimate strength but substantially improved post-cracking ductility.
  • Unloading stiffness remained stable with minimal hysteresis loops during unloading/reloading.

Conclusions:

  • High-strength short steel fibers effectively control degradation in high-performance concrete by managing microcrack development and enhancing ductility.
  • The inclusion of steel fibers improves the material's resilience under cyclic loading and maintains stable stiffness even with significant crack openings.