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Research draft

mechanical stress

vr.tr.mechanical-stress · XCT.QLT

Let an agent explain mechanical stress and its components and units, describe its relation to strain and material strength, support engineering calculations and materials questions, and support learning in mechanics.

Thing Registry Cross-cutting context

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain mechanical stress and its components and units, describe its relation to strain and material strength, support engineering calculations and materials questions, and support learning in mechanics.

A physical quantity expressing the internal forces that neighbouring particles of a material exert on each other per unit area, described by the Cauchy stress tensor and resolved into normal stress, including tensile and compressive stress, and shear stress, and related to material properties such as elastic limit, yield strength, tensile strength and compressive strength; mechanical stress is central to solid mechanics, structural engineering and materials science and is measured in pascals.

What it is for: Internal force per unit area in a material.

It can be explain components and units; describe relation to strain and strength; support calculations; support learning.

Distinguishing features

Tensor quantity

Normal and shear components

Pascal units

Strength limits

What it looks like

Not physical; a quantity.

How it is recognised

Force per unit area inside a material

Normal, shear, tensile, compressive

Pressure is stress in fluids; strain is deformation; psychological stress is unrelated

Related models

is a kind of - category

physical quantity

is related to - thermal stress arises from heating

heat

is related to - structures analysed for stress

bridge

is related to - the psychological sense, a separate concept

stress

In practice

Families and kinds

normal stress, tensile and compressive

shear stress

principal stresses and stress tensor

residual and thermal stress

stress limits such as elastic limit and strength

Standards and regulation

SI units for stress

Materials testing standards

Structural design codes

Failure modes and hazards

Structural failure from exceeding strength

Confusing stress with strain or pressure

Unit errors

Also called

compressive strengthtensile stressnormal stressCauchy stress tensorshear stresselastic limitprincipal stressesinitial stressresidual stressstring tensiondifferential stresswinding tensionEffective stressthermal stresspreloadcompressive stressyield strengthbending stressCoulomb stress transfercrustal stressplane stressultimate tensile strengthvirial stressflexural strengthflow stressshear stress at flow limitcritical resolved shear stresscompression elastic limittrue elastic limit

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Understand What mechanical stress is.

Mechanics.

Concept

Concept and components.

Concept

Concept.

  1. What is mechanical stress, how is the stress tensor resolved into normal and shear components, and what are principal stresses? definition
  2. Is mechanical or psychological stress meant? boundary

Units

Units and measurement.

Units

Units.

  1. What units express stress, and how is stress measured or inferred from strain? measurement
  2. Which entry fits strain gauges? action
Apply Engineering use.

Practice.

Calculate

Calculating stress.

Calculate

Calculation.

  1. How can stress in this member or component be calculated from loads and geometry? action
  2. Which entry fits structural analysis? action

Strength

Strength and limits.

Strength

Strength.

  1. How do elastic limit, yield strength, tensile strength and compressive strength relate to stress, and how are safety factors applied? provenance
  2. Which entry fits a specific material? action
Science Materials and failure.

Science.

Materials

Materials behaviour.

Materials

Materials.

  1. How do materials respond to stress through elasticity, plasticity, creep and fracture? provenance
  2. Which entry fits materials science? action

Failure

Failure analysis.

Failure

Failure.

  1. How do stress concentrations, fatigue and residual stress lead to failure? provenance
  2. Which entry fits fatigue? action
Learn History and teaching.

Education.

History

History.

History

History.

  1. How did the concept of stress develop from Cauchy and earlier mechanics? provenance
  2. Which references are standard? provenance

Teach

Teaching.

Teach

Teaching.

  1. How can stress and strain be taught with demonstrations? action
  2. Which misconceptions arise? provenance

What the second pass must settle

  • Should shear stress be a separate entry?
  • How should testing standards be linked?
  • How should design codes be linked?
Draft as JSON