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Related Concept Videos

Fatigue01:21

Fatigue

206
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...
206
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

336
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
336
Plastic Behavior01:21

Plastic Behavior

222
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...
222
Residual Stresses in Bending01:18

Residual Stresses in Bending

207
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
207
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

838
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...
838
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

400
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
400

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Waveform load analysis for fatigue in the printed PLA.

Moises Jimenez-Martinez1, Julio Varela-Soriano1, José Jorge Rojas Carreón1

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This study investigates fused filament fabrication (FFF) parts under cyclic loading. Results show square waveforms cause the most damage, aiding in predicting component life for functional applications.

Keywords:
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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Fused filament fabrication (FFF) is a key additive manufacturing process for complex geometries.
  • Current FFF components often have lower mechanical strength than conventionally manufactured parts, limiting their use to prototyping.
  • Component failure frequently occurs under repeated cyclic loads, necessitating an understanding of fatigue properties for functional applications.

Purpose of the Study:

  • To investigate the fatigue behavior of FFF test specimens under different cyclic load waveforms.
  • To determine the effect of various waveforms on accumulated damage in FFF parts.
  • To predict the component life of FFF parts under repeated loading conditions.

Main Methods:

  • Testing of FFF specimens under three distinct cyclic load waveforms: sinusoidal, triangular, and square.
  • Analysis of accumulated damage and fatigue properties under each waveform.
  • Comparison of fatigue performance across different loading conditions.

Main Results:

  • The square waveform was identified as inducing the most severe loading conditions among the tested waveforms.
  • Significant differences in fatigue behavior were observed based on the applied load waveform.
  • Data was gathered to support the prediction of component lifespan for FFF parts.

Conclusions:

  • This research provides crucial insights into the fatigue properties of FFF parts under varied cyclic loads.
  • Understanding these fatigue characteristics can lead to improved mechanical predictions for materials like PLA.
  • The findings suggest FFF parts could be viable for functional components, not just prototypes or spare parts.