Rigidity

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rigidity

[ri′jid·əd·ē]
(astrophysics)
The ratio of the momentum of a cosmic-ray particle to its electric charge, in units of the electron charge.
(mechanics)
The quality or state of resisting change in form.

Rigidity

 

the capability of a body or structure to resist deformation; a physicogeometric characteristic of the cross section of a structural element. In the case of simple deformations within the limits of Hooke’s law, rigidity is determined numerically as the product of the modulus of elasticity E (on elongation-contraction and on flexure) or G (on shear and torsion) and some geometric characteristic of the element cross section:EF on elongation-compression, El on flexure, GF on shear, and so on, where F is the cross section area, and I is the axial moment of inertia. The concept of rigidity is being widely used in the solution of problems concerning the strength of materials.


Rigidity

 

in physiology, a functional state of the skeletal muscles, characterized by a marked increase in their tone and in their resistance to deformation. Muscle rigidity results from changes in the character of the neural influences that the central and peripheral nervous systems continuously exert to the muscles. An example of rigidity is decerebrate rigidity.

In man, injuries and disturbances of the central nervous system and pathological irritation of the peripheral nerves give rise to various manifestations of muscle rigidity. Thus, poisoning by certain toxins, diseases of the nervous system, and hypnosis may cause a state of plastic tone, characterized by a waxlike condition of the muscles. In this state the extremities may easily be placed in any position and can remain thus, unchanged, for a prolonged period. Plastic tone characterizes a state of the nervous system called catalepsy, or plastic rigidity.

rigidity

That property of a material which resists a change in its physical shape.

rigidity

i. The resistance offered by a body when under load. It is the ratio of the stress to the strain. Also known as stiffness
ii. A property of a gyroscope by which its axis will remain in a fixed direction in space unless the rotor is acted upon by an external torque.
References in periodicals archive ?
The E-Series R100E is a completely new Volvo CE 100-ton (95-tonne) rigid hauler that combines a wealth of market and customer knowledge with proven components, new technologies and a striking new design--all providing a cost-effective and productive solution to fulfill the needs of today's mining and quarrying customers.
This report on Rigid Packaging Market also offers competition assessment tools such as market positioning of key players, attractive investment proposition, and Porter's Five Forces model to give the readers a view of the competitive scenario of the Rigid Packaging Market.
This company said the acquisition broadens Amcor's technology in the region and strengthens its position as a global supplier of rigid plastic containers.
Since 2010, Amcor Rigid Plastics has been building a strong position in the specialty container segment through its Diversified Products business unit.
In the rigid nephroscope group, stones were fragmented and cleared by pneumatic lithotripsy and an ultrasonic system (EMS Electro Medical System, Nyon, Switzerland).
Tripling the recycling rate for rigid plastics in just six years is an amazing accomplishment," said Steve Alexander, executive director of the Association of Postconsumer Plastics Recyclers (APR).
Still, metal cans will remain an important segment of the rigid packaging mix due to their durability, long shelf life, tamper resistance, ease of storage, recyclability, and the economic advantages of canned items in controlling food expenditures.
For rigid PCBs and flexible circuits combined, industry shipments in March 2007 decreased 11.
Operating an advanced plant geared to supply chain management disciplines, Rigid provides Constar with a comprehensive service covering consultation, design, prototyping and product development.
At the rigid packaging plant in Ravensburg, Germany, a directive to increase output of its core product prompted a revolutionary process development, says Eric Chavent, group commercial director at Ravensburg.
Examination was performed with a distal-chip flexible laryngoscope and a rigid laryngeal 70[degrees] telescope.
A line of rigid couplings includes small bore sizes.