Das Kraft-Dehnungs-Verhalten von Rattenkarotiden in Längsrichtung bei verschiedenem Innendruck und seine modellmäßige Deutung

Weizsäcker, Hans Werner; Pascale, K.

doi:10.1007/bf01907042

Cited by 10 publications

(3 citation statements)

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“…The experimental setup used has been described in [33,35]. The experimental setup used has been described in [33,35].…”

Section: Methodsmentioning

confidence: 99%

“…la and Ib. The first plate has a T-shaped connector which snugly f its into the clamping mechanism of the machine [33,35]. la) consists of two Symmetrie slip proof grips, akin to the ones described by Vossoughi and Vaishnav [32].…”

Section: Introductionmentioning

confidence: 99%

“…

Simple elongation tests were performed on circumferential and longitudinal strips of rat thoracic aorta. The experimental setup used has been described in [33,35].

The results show that, despite the incompressibility of the arterial tissue and independently of the definitions used, Poisson's ratios deviate from 0.5.…”

mentioning

confidence: 99%

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Elasticity of Rat Thoracic Aortas in Simple Elongation - Elastische Eigenschaften der Aorta Thoracica von Ratten im einfachen Zugversuch

Weizsäcker¹,

Pascale²,

Kenner³

1984

Biomedizinische Technik/Biomedical Engineering

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Simple elongation tests were performed on circumferential and longitudinal strips of rat thoracic aorta. Data were analyzed with various definitions of stress, strain, elastic moduli and Poisson's ratios, commonly used in arterial rheology. The results show that, despite the incompressibility of the arterial tissue and independently of the definitions used, Poisson's ratios deviate from 0.5. Unlike reports in the literature, the stress-strain relationship of thoracic aortas, at least in rats, appears to be »biphasic«: it is almost linear at low, and strongly alinear at high, stress levels.Schlüsselwörter: Ratten Aorta Thoracica, Spannung, Dehnung, Elastizitätsmodul, Querzahl Obwohl in der Literatur viele Berichte über das Dehnungsverhalten von Arterien vorliegen, gibt es hinsichtlich der Ergebnisse und deren Deutung noch viele Unsicherheiten. Insbesondere wurden wenig Versuche durchgeführt, bei denen sowohl Spannung, Dehnung als auch Querkontraktionszahlen im einfachen Zugversuch in mehreren Richtungen gemessen wurden. Wir haben an circumferentiell und longitudinal präparierten Streifen der Aorta Thoracica von Ratten einfache Dehnungsversuche durchgeführt, um die wesentlichen Eigenschaften von Arteriengewebe zu untersuchen. Die Daten wurden mittels verschieden definierten Materialgrößen beschrieben und mit der Literatur verglichen. Die Ergebnisse hängen stark von den verwendeten Definitionen von Dehnung, Spannung und Module ab. In jedem Fall kann gezeigt werden, daß die Querkontraktionszahl der Arterienwand von Dehnung und Dehnungsrichtung abhängt und trotz Inkompressibilität des Gewebes von 0,5 abweicht. Entgegen Berichten in der Literatur scheint der Spannungs-Dehnungsverlauf der Aorta Thoracica, zumindest bei Ratten, einen »biphasischen« Verlauf zu haben: er ist annähernd linear bis Dehnungen von etwa 0,4 und steigt dann stark überproportional an.* This study was supported by the Austrian Research Fund, GrantP4682.context, might appear negligible in another, depending on the specific question for which an answer is sought. Sometimes inconsistencies arise when essential parameters are ignored or when theories based on specific protocols are generalized beyond experimental evidence. Often however, seeming contradictions can be explained by differences in the definition of the material parameters used. Vaishnav, Vossoughi and Patel [23,32, 29,30,31] and Kenner [16] have recently redrawn attention to the wide variety of definitions used in the description of arterial elasticity and to possible confusion arising from this Situation.In this communication sonflghj^finitions of stress, strain, elastic modulus and Pois&än's ratio are reviewed and used to describe the passive elastic properties of rat thoracic aortas in uniaxial tests. Methods ExperimentalSimple elongation tests were carried out on strips cut in longitudinal direction and on strips and rings cut in circumferential direction from Segments of rat thoracic aortas. The experimental setup used has been described in [33,35].

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“…The experimental setup used has been described in [33,35]. The experimental setup used has been described in [33,35].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%