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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Thin-Walled Hollow Shafts01:15

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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When a car’s weight and driving forces act on a tire, they impose an external load on the rubber material. This load is resisted internally by forces distributed throughout the tire structure, which are defined as stress. The resulting deformation of the rubber due to this stress is quantified as strain. The relationship between stress and strain governs how the tire deforms under load and is central to understanding its mechanical response during operation.Rubber exhibits a nonlinear...
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Deformation of Member under Multiple Loadings01:11

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
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Continuous damage parameter calculation under thermo-mechanical random loading.

Marko Nagode1

  • 1University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, 1000 Ljubljana, Slovenia.

Methodsx
|July 8, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to calculate fatigue damage under complex thermo-mechanical loading, accounting for mean stress effects continuously. It overcomes limitations of existing approaches by enabling real-time damage parameter computation.

Keywords:
Damage parameterHysteresis operatorLow cycle fatigueMean stressThermo-mechanical fatigue

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Fatigue Analysis

Background:

  • Fatigue damage assessment is crucial for structural integrity under cyclic loading.
  • Existing methods for fatigue analysis often struggle with complex thermo-mechanical conditions and mean stress effects.
  • Standardized damage parameters have limitations, particularly in continuous, non-isothermal loading scenarios.

Purpose of the Study:

  • To develop a novel method for calculating fatigue damage under arbitrary low cycle thermo-mechanical loading.
  • To effectively incorporate the influence of mean stress on fatigue damage.
  • To overcome the limitations of existing methods by enabling continuous damage parameter computation.

Main Methods:

  • Extracting cycle amplitudes and mean values from stress, elastoplastic strain, and temperature histories.
  • Transforming stress and elastoplastic strain histories into amplitude and mean values.
  • Computing damage parameter amplitude history from transformed stress and strain data.
  • Deriving the continuous damage parameter history from its amplitude history.

Main Results:

  • A method is presented to account for the mean stress effect on fatigue damage under low cycle thermo-mechanical loading.
  • The proposed method allows for continuous damage parameter computation, surpassing limitations of cycle-closing requirements.
  • Damage parameters, originally for isothermal cycles, are adapted for complex thermo-mechanical conditions.

Conclusions:

  • The developed method provides a more comprehensive approach to fatigue damage analysis under realistic loading conditions.
  • Continuous damage computation enhances the accuracy and applicability of fatigue life predictions.
  • The findings enable better assessment of material behavior and component reliability in thermo-mechanical fatigue scenarios.