The development of torque in biaxial rotation fatigue testing of fibres

Calil, S. F.; Goswami, Bhuvenesh C.; Hearle, J. W. S.

doi:10.1088/0022-3727/13/4/025

“…In table 1 Mr(76/4) and A q ( t ) for t = lo3 s are quoted for various values o f f = (n/4) sin 6, together with the data of Cali1 et a1 (1980). The conclusion of Cali1 et al(1980) that, unless the material has a very low loss factor, the torque due to internal friction will be much greater than the torque due to external friction, is confirmed.…”

Section: De' 2170mentioning

confidence: 90%

The development of (false) twist in biaxial rotation fatigue testing of fibres

Waterman

¹

1983

J. Phys. D: Appl. Phys.

2

0

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“…The morphological phenomena obinto many fibrillar elements (Figs. [4][5][6]9). served following yarn on bone wear resemble those found Crushed Fibers: If the fibers in a textile structure are previously in the analysis of ropes used in maritime applieasily deformed or have started to experience axial splitting cations.…”

Section: Type Ofmentioning

confidence: 99%

“…Some of these studies have addressed the question would be represented. Two types of in vitro wear tests were used: one to simu-of bending, rotational or torsional motion, [5][6][7][8][9][10] and tensile fatigue, 11 -13 while others have considered the wear and abra-late yarn on bone wear and the other yarn on yarn wear. For the former test involving yarn on bone wear, two types sion between two fiber or yarn surfaces or against an abrasive surface such as Emery paper.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanisms of anterior cruciate ligament prostheses: In vitro wear study

Poddevin

¹

,

King

²

,

Guidoin

³

1997

J. Biomed. Mater. Res.

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Previous retrieval studies analyzing the cause of failure of anterior cruciate ligament (ACL) prostheses identified a wear mechanism. However, the relative importance of yarn on bone compared to yarn on yarn wear has not been clearly understood. Therefore, the objective of this study was to elucidate which type of wear is the dominant cause of clinical failure. A variety of ACL prosthetic structures were exposed to two in vitro tests: one for yarn on yarn and the other for a novel yarn on bone wear test system. The latter included the use of both smooth (uncut) and rough (cut) bone surfaces to simulate the conditions around the condyle and at the exit of the tibial tunnel, respectively. The damaged textile structures were viewed by SEM. The various fiber fracture morphologies were identified and classified for the two types of wear tests; for the smooth and rough bone surfaces; for the braided, knitted, woven, and twisted textile structures; and for the three types of fibers that were included: polyethylene terephthalate, polypropylene, and ultrahigh molecular weight polyethylene. The results confirmed that yarn on bone and yarn on yarn wear phenomena are associated with significantly different failure mechanisms. While the more aggressive rough (or cut) bone causes more rapid and intense fiber damage and faster ACL failure than the smooth (uncut) osseous surface, both abradants cause the same type of abrasive wear phenomenon. Differences in failure mechanisms were identified between the different textile structures and the different fiber types. By interpreting the damaged fiber images from clinically failed and retrieved ACL prostheses, we are now able to confirm that the predominant cause of synthetic ACL failure is yarn on bone abrasion. Improvements in future ACL prosthesis designs will only be possible by eliminating or minimizing the effect of this type of abrasive wear.

show abstract

Failure mechanisms of anterior cruciate ligament prostheses:In vitro wear study

Poddevin

¹

,

King

²

,

Guidoin

³

1997

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

Previous retrieval studies analyzing the cause of failure of anterior cruciate ligament (ACL) prostheses identified a wear mechanism. However, the relative importance of yarn on bone compared to yarn on yarn wear has not been clearly understood. Therefore, the objective of this study was to elucidate which type of wear is the dominant cause of clinical failure. A variety of ACL prosthetic structures were exposed to two in vitro tests: one for yarn on yarn and the other for a novel yarn on bone wear test system. The latter included the use of both smooth (uncut) and rough (cut) bone surfaces to simulate the conditions around the condyle and at the exit of the tibial tunnel, respectively. The damaged textile structures were viewed by SEM. The various fiber fracture morphologies were identified and classified for the two types of wear tests; for the smooth and rough bone surfaces; for the braided, knitted, woven, and twisted textile structures; and for the three types of fibers that were included: polyethylene terephthalate, polypropylene, and ultrahigh molecular weight polyethylene. The results confirmed that yarn on bone and yarn on yarn wear phenomena are associated with significantly different failure mechanisms. While the more aggressive rough (or cut) bone causes more rapid and intense fiber damage and faster ACL failure than the smooth (uncut) osseous surface, both abradants cause the same type of abrasive wear phenomenon. Differences in failure mechanisms were identified between the different textile structures and the different fiber types. By interpreting the damaged fiber images from clinically failed and retrieved ACL prostheses, we are now able to confirm that the predominant cause of synthetic ACL failure is yarn on bone abrasion. Improvements in future ACL prosthesis designs will only be possible by eliminating or minimizing the effect of this type of abrasive wear.

show abstract

The development of torque in biaxial rotation fatigue testing of fibres

Cited by 12 publications

References 5 publications

The development of (false) twist in biaxial rotation fatigue testing of fibres

The development of (false) twist in biaxial rotation fatigue testing of fibres

Failure mechanisms of anterior cruciate ligament prostheses: In vitro wear study

Failure mechanisms of anterior cruciate ligament prostheses:In vitro wear study

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