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Related Concept Videos

Plastic Behavior01:21

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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...
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Yield Criteria for Ductile Materials under Plane Stress01:25

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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.
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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...
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Two step yielding in soft materials.

Amit Ahuja1, Andrei Potanin2, Yogesh M Joshi3

  • 1TA Instruments, Waters LLC, 159 Lukens Drive, New Castle, DE, USA 19720.

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|July 5, 2020
PubMed
Summary
This summary is machine-generated.

Complex fluids exhibit two-step yielding due to distinct particle interactions or timescales. This review explores the physical mechanisms and rheological consequences of this phenomenon across various materials.

Keywords:
Attractive glassColloidal gelsLAOSStructure-propertyTwo-step yielding

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Area of Science:

  • Rheology
  • Soft Matter Physics
  • Materials Science

Background:

  • Two-step yielding is a complex rheological behavior observed in diverse materials like colloidal gels, glasses, emulsions, and pastes.
  • This phenomenon is characterized by the presence of two distinct interaction forces or timescales between constituent particles.

Purpose of the Study:

  • To provide physical insights and mechanistic understanding of two-step yielding in complex fluids.
  • To review associated rheological consequences and microstructural details of this nonlinear behavior.

Main Methods:

  • Literature review of experimental systems exhibiting two-step yielding.
  • Analysis of microstructural features and similarities/differences across various materials.

Main Results:

  • Identified common features in systems displaying two-step yielding.
  • Detailed the influence of continuous phase properties and dispersed particle characteristics (size, shape, softness, surface charge).
  • Examined the effects of external force fields (electric, magnetic, thermal, shear flows) on yielding behavior.

Conclusions:

  • Two-step yielding is a prevalent behavior in complex fluids, driven by specific inter-particle forces or timescales.
  • Understanding this phenomenon requires considering microstructural details and external factors influencing material response.