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Related Concept Videos

Fatigue01:21

Fatigue

174
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...
174
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

171
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...
171
Plastic Behavior01:21

Plastic Behavior

190
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
190
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

149
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
149
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

140
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
140
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

146
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...
146

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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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Fatigue Behavior of Cord-Rubber Composite Materials under Different Loading Conditions.

Julian Torggler1, Martin Leitner1, Christian Buzzi1

  • 1Institute of Structural Durability and Railway Technology, Graz University of Technology, Inffeldgasse 25/D, 8010 Graz, Austria.

Materials (Basel, Switzerland)
|October 16, 2024
PubMed
Summary

Higher strain ratios significantly extend the service life of cord-rubber composites. This research highlights the importance of considering strain ratio in the fatigue analysis of these materials.

Keywords:
cord-rubber compositesfatigue designmechanical testingnumerical analysistomography

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Polymer Science

Background:

  • Cord-rubber composites are vital in numerous applications, yet their fatigue behavior is not fully understood.
  • Fatigue is a critical failure mechanism for composite materials under cyclic loading.

Purpose of the Study:

  • To investigate the impact of different strain ratios on the fatigue life of cord-rubber composites.
  • To compare fatigue performance under pure pulsating tensile strain versus increased mean strain conditions.

Main Methods:

  • Development of representative cord-rubber composite specimens.
  • Utilization of a validated numerical model for fatigue parameter assessment.
  • Conducting cyclic fatigue tests with varying strain ratios (R ~0 and 0.2-0.3).

Main Results:

  • A higher strain ratio (0.2-0.3) significantly increased service life compared to a pure pulsating tensile strain (R ~0).
  • The slope (k) increased from 13 to 23, and ultimate fiber strain rose from 8% to 11% at 50,000 cycles for the higher strain ratio.
  • Both test series exhibited comparable scatter in results, indicating consistent variability.

Conclusions:

  • The strain ratio is a critical factor influencing the fatigue behavior of cord-rubber composites.
  • Design and evaluation of components using these materials must account for diverse loading conditions and their effect on fatigue life.