What's the difference between durometer and stiffness?

Durometer


Definition:

  • (n.) An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like.

Example Sentences:

  • (1) Corrections were made for differences in the level of the durometer and the level at which the device measuring lumbar or intracranial pressure was placed.
  • (2) Twelve healthy subjects ran in each of three running shoes with unique midsole durometers (C1, 70; C2, 55; C3, 45).
  • (3) RTV silicone MDX 4-4210 unmodified and modified with the addition of 5%, 10%, and 15% 360 MF 100cs was tested for the following physical properties: tensile strength, ultimate elongation (ASTM D412 die C), tear resistance (ASTM D624, die C), and Shore A Durometer hardness (ASTM D2240).
  • (4) The everting element is a low-durometer thermoplastic polyurethane elastomer.
  • (5) The tensity of the skin over a supratentorial craniectomy was measured with a durometer placed on the skin flap.
  • (6) Indentation hardness was measured with a Shore-A durometer.
  • (7) The viscoelastic properties of Sorbothane were investigated by Durometer tests at various temperatures as well as compression tests of thin discs of material with different degrees of lateral constraints and varying rates of loading.

Stiffness


Definition:

  • (n.) The quality or state of being stiff; as, the stiffness of cloth or of paste; stiffness of manner; stiffness of character.

Example Sentences:

  • (1) If you turn the bowl upside down, the whites should be stiff enough not to fall out.
  • (2) The stiffness of the fibre first rose abruptly in response to stretch and then started to decrease linearly while the stretch went on; after the completion of stretch the stiffness decreased towards a steady value which was equal to that during the isometric tetanus at the same sarcomere length, indicating that the enhancement of isometric force is associated with decreased stiffness.
  • (3) Current methodology for the in vitro determination of aortic and large artery stiffness is reviewed and involves three approaches: (1) the estimation of distensibility by pulse wave velocity measurement; (2) the estimation of distensibility from the fractional diameter change of a given arterial segment by imaging techniques (e.g., angiography, Doppler ultrasound) against pressure change; (3) the estimation of compliance by determining volume change against pressure change in the arterial system during diastolic runoff from the Windkessel model of the circulation.
  • (4) The maintenance of adequate blood circulation requires a sufficient ventricular contractility; in addition, to eject blood, the ventricles must first receive a sufficient volume, requiring a low diastolic stiffness.
  • (5) Stiffness was reduced in approximate proportion to the ramp stretch rate, and the reduction was confined largely to the elastic component.
  • (6) Proof stress, ultimate tensile strength, elongation, and plastic stiffness have been measured and results compared by use of analyses of variance.
  • (7) In other words, the stiffness of these areas was low and the recovery from deformation was fast.
  • (8) But the same court also just refused to hear an appeal of a Minnesota woman who's been ordered to pay more than $220,000 for downloading two-dozen songs – a testament to Congress' gift to Hollywood and its allies in the form of absurdly stiff penalties for minor infringement.
  • (9) The tension-length relation for the unstimulated (passive) cell is also linear between 1r and the elastic limit, but is displaced from the active tension-length curve and is of reduced stiffness.
  • (10) Bilaterals in summit seasons can be stiff exchanges, where digressions can carry risks: not enough said, too much said.
  • (11) We measured the stiffness of comparable configurations (1 or 2 bars) under axial compression, four-point-bending in two planes, and torsion.
  • (12) Tiny, tiny... rodents – some soft and grey, some brown with black stripes, in paintings, posters, wallcharts, thumb-tacked magazine clippings and poorly executed crayon drawings, hurling themselves fatally in their thousands over the cliff of their island home; or crudely taxidermied and mounted, eyes glazed and little paws frozen stiff – on every available surface.
  • (13) The bone stiffness also correlates strongly with the geometry (area) and slightly with bone mass; however, an unexpectedly low correlation was found between stiffness and density.
  • (14) Finally, fibrosis may paradoxically reduce passive stiffness if it leads to a thinning of the interventricular septum.
  • (15) A young male nephrotic patient, who was given small doses of clofibrate for hyperlipaemia, developed muscle pain, stiffness and very high serum levels of muscle enzymes.
  • (16) Impaired left ventricular stiffness may be an additional criterion for using corinfar in patients with coronary heart disease.
  • (17) The increase of elastic fibres following denervation and reinnervation represents an obviously meaningful reaction that may compensate for loss of tonic properties of muscle spindles without causing stiffness.
  • (18) Only the bone-patellar tendon-bone unit had maximum force and stiffness greater than that of the ACL.
  • (19) The initial stiffness is poorly described by material or catheter gauge.
  • (20) The stiffness tester and torque meter were found to yield nearly the same measurements of bending deformation for orthodontic wires as small as .007 inch diameter, provided the different bending apparatus are calibrated to each other.

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