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Related Concept Videos

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
456
Screw: Problem Solving01:21

Screw: Problem Solving

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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
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Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

683
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Related Experiment Video

Updated: Dec 27, 2025

Cantilever Bending of Murine Femoral Necks
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Panicle Angle is an Important Factor in Tef Lodging Tolerance.

Regula Blösch1, Sonia Plaza-Wüthrich1, Pierre Barbier de Reuille1

  • 1Institute of Plant Sciences, University of Bern, Bern, Switzerland.

Frontiers in Plant Science
|March 3, 2020
PubMed
Summary
This summary is machine-generated.

Tef landraces lodge less than improved varieties due to compact panicles and reduced height. Panicle angle is a key factor influencing lodging in tef [Eragrostis tef], impacting crop stability.

Keywords:
Eragrostis teflodgingmechanical propertymodelingstem bendingtef

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Area of Science:

  • Agricultural Science
  • Plant Biology
  • Biotechnology

Background:

  • Tef [Eragrostis tef] is a vital staple crop in Ethiopia, feeding over 60 million people.
  • Low productivity in tef is partly due to susceptibility to lodging, exacerbated by environmental factors and fertilizer use.
  • Understanding tef lodging is crucial for improving food security in the Horn of Africa.

Purpose of the Study:

  • To investigate the biomechanical properties influencing lodging tolerance in tef genotypes.
  • To compare lodging resistance between high-yielding improved tef varieties and lower-yielding natural landraces.
  • To identify key plant traits contributing to lodging resistance in tef.

Main Methods:

  • Combined biomechanical measurements with computational modeling to assess lodging properties.
  • Compared lodging tolerance in improved tef genotypes and natural landraces.
  • Developed a stem-bending model to analyze the impact of panicle angle on lodging.

Main Results:

  • Tef landraces exhibited greater lodging resistance than improved varieties.
  • Compact panicles and reduced plant height were associated with increased lodging resistance.
  • Panicle angle was identified as a significant determinant of lodging severity in tef.

Conclusions:

  • Tef landraces possess inherent traits beneficial for lodging tolerance.
  • Plant architecture, specifically panicle characteristics and height, are critical targets for tef improvement programs.
  • Findings offer valuable insights for developing lodging-resistant tef varieties to enhance crop stability and yield.