Elastic limit - Revision history

Editor at 10:37, 26 January 2023

2023-01-26T10:37:39Z

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	= Introduction =		= Introduction =
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	A solid material’s elastic limit is the maximum stress per unit area it can withstand before there is permanent deformation. In other words, it is the limit of the material’s elasticity, for up to that point, the solid can resume its original shape when the load is removed; after that point, it undergoes permanent (plastic) deformation and will not return to its original shape even after the load (yield load) has been removed.		A solid material’s elastic limit is the maximum stress per unit area it can withstand before there is permanent deformation. In other words, it is the limit of the material’s elasticity, for up to that point, the solid can resume its original shape when the load is removed; after that point, it undergoes permanent (plastic) deformation and will not return to its original shape even after the load (yield load) has been removed.

−	On a graph showing a stress-strain curve, the point of the limit of elastic behaviour is called the ‘yield point’ and this is where plastic deformation begins – some of this deformation will be plastic and irreversible. In structural engineering, the yield point is regarded as a ‘soft failure’ mode which does not usually cause catastrophic or ultimate failure.	+	On a graph showing a stress-strain curve, the point of the limit of elastic behaviour is called the ‘yield point’ and this is where plastic deformation begins – some of this deformation will be plastic and irreversible. In structural engineering, the yield point is regarded as a ‘soft failure’ mode which does not usually cause catastrophic or ultimate failure. It might be referred to as the fracture point or in the case of structural failure the breaking point, such as where a timber beam goes beyond, the yield, soft failure and fracture to break and collapse.

	No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.		No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.

Editor at 09:46, 14 December 2022

2022-12-14T09:46:46Z

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	= Introduction =		= Introduction =

Editor at 07:35, 14 December 2022

2022-12-14T07:35:03Z

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	This occurs when the deformation in a material is proportional to the load applied. So, if a person weighing 50kg causes a diving board to deflect by 300mm, and another person weighing 100kg causes an identical board to deflect by 600mm, the diving board is exhibiting linear deflection. Most structural materials are, within limits, linearly elastic and are used within their linearly elastic range.		This occurs when the deformation in a material is proportional to the load applied. So, if a person weighing 50kg causes a diving board to deflect by 300mm, and another person weighing 100kg causes an identical board to deflect by 600mm, the diving board is exhibiting linear deflection. Most structural materials are, within limits, linearly elastic and are used within their linearly elastic range.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Concept structural design.		* Concept structural design.

Designing Buildings at 07:30, 19 January 2021

2021-01-19T07:30:22Z

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	* Vibrations.		* Vibrations.

−	[[Category:Theory]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]

Designing Buildings at 09:00, 24 October 2019

2019-10-24T09:00:54Z

← Older revision		Revision as of 09:00, 24 October 2019
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	No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.		No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.

−	All structural materials behave plastically ~~above~~ their elastic range. However, even if some materials show elastic behaviour, they may – after a long period of service, usually many years – exhibit a degree of plastic flow (or creep).	+	All structural materials behave plastically beyond their elastic range. However, even if some materials show elastic behaviour, they may – after a long period of service, usually many years – exhibit a degree of plastic flow (or creep).

	= Linear elasticity =		= Linear elasticity =

Designing Buildings at 08:52, 24 October 2019

2019-10-24T08:52:12Z

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	= Elastic limit =		= Elastic limit =

−	A solid material’s elastic limit is the maximum stress per unit area it can withstand before permanent deformation ~~sets in~~. In other words, it is the limit of the material’s elasticity, for up to that point, the solid can resume its original shape when the load is removed; after that point, it undergoes permanent (plastic) deformation and will not return to its original shape even after the load (yield load) has been removed.	+	A solid material’s elastic limit is the maximum stress per unit area it can withstand before there is permanent deformation. In other words, it is the limit of the material’s elasticity, for up to that point, the solid can resume its original shape when the load is removed; after that point, it undergoes permanent (plastic) deformation and will not return to its original shape even after the load (yield load) has been removed.

−	On a graph showing a stress-strain curve, the point at the limit of elastic behaviour is called the ‘yield point’ and is where plastic deformation begins – some of this deformation will be plastic and irreversible. In structural engineering, yield point is regarded as a ‘soft failure’ mode which does not usually cause catastrophic or ultimate failure.	+	On a graph showing a stress-strain curve, the point of the limit of elastic behaviour is called the ‘yield point’ and this is where plastic deformation begins – some of this deformation will be plastic and irreversible. In structural engineering, the yield point is regarded as a ‘soft failure’ mode which does not usually cause catastrophic or ultimate failure.

	No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.		No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.

Editor: Created page with "= Introduction = All materials show elastic behaviour to a degree, some more than others. If, after a load has been applied and then quickly removed, a material returns rapidly ..."

2019-10-08T17:58:27Z

Created page with "= Introduction = All materials show elastic behaviour to a degree, some more than others. If, after a load has been applied and then quickly removed, a material returns rapidly ..."

New page

= Introduction =

All materials show elastic behaviour to a degree, some more than others. If, after a load has been applied and then quickly removed, a material returns rapidly to its original shape, it is said to be behaving elastically. Elasticity is a crucial characteristic of building materials; if it were not, buildings would suffer continuous deformation under load and ultimately would collapse.

= Elastic limit =

A solid material’s elastic limit is the maximum stress per unit area it can withstand before permanent deformation sets in. In other words, it is the limit of the material’s elasticity, for up to that point, the solid can resume its original shape when the load is removed; after that point, it undergoes permanent (plastic) deformation and will not return to its original shape even after the load (yield load) has been removed.

On a graph showing a stress-strain curve, the point at the limit of elastic behaviour is called the ‘yield point’ and is where plastic deformation begins – some of this deformation will be plastic and irreversible. In structural engineering, yield point is regarded as a ‘soft failure’ mode which does not usually cause catastrophic or ultimate failure.

No structural material exhibits perfect elasticity: depending on the type of structure and the material, permanent deformations are unavoidable whenever loads exceed certain values. That is why engineers design structures to ensure the materials are being used within their elastic range and the loads involved will not produce permanent deformations.

All structural materials behave plastically above their elastic range. However, even if some materials show elastic behaviour, they may – after a long period of service, usually many years – exhibit a degree of plastic flow (or creep).

= Linear elasticity =

This occurs when the deformation in a material is proportional to the load applied. So, if a person weighing 50kg causes a diving board to deflect by 300mm, and another person weighing 100kg causes an identical board to deflect by 600mm, the diving board is exhibiting linear deflection. Most structural materials are, within limits, linearly elastic and are used within their linearly elastic range.

= Related articles on Designing Buildings Wiki =

* Concept structural design.
* Detailed design.
* Elements of structure in buildings.
* Moment.
* Stiffness.
* Structural engineer.
* Structural principles.
* Structural systems for offices.
* Structural vibration.
* Structures at the end of their design life.
* The development of structural membranes.
* Types of structural load.
* Vibrations.

[[Category:Theory]]