Novel measurement technique for knee joint laxities using polymeric capacitive strain gauges

2014 ◽  
Author(s):  
M. Zens ◽  
J. Ruhhammer ◽  
F. Goldschmidtboeing ◽  
P. Woias ◽  
H. O. Mayr ◽  
...  
Keyword(s):  
Knee Joint ◽  
Measurement Technique ◽  
Strain Gauges ◽  
Capacitive Strain

Interdigital capacitive strain gauges fabricated by direct-write thermal spray and ultrafast laser micromachining

2007 ◽  
Vol 133 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Jinggao Li ◽  
Jon P. Longtin ◽  
Szymon Tankiewicz ◽  
Andrew Gouldstone ◽  
Sanjay Sampath
Keyword(s):  
Thermal Spray ◽  
Laser Micromachining ◽  
Ultrafast Laser ◽  
Strain Gauges ◽  
Direct Write ◽  
Capacitive Strain

Ligament Strain in the Human Knee Joint

1970 ◽  
Vol 92 (1) ◽  
pp. 131-136 ◽  
Author(s):  
R. G. Edwards ◽  
J. F. Lafferty ◽  
K. O. Lange
Keyword(s):  
Knee Joint ◽  
Analytical Model ◽  
Experimental Results ◽  
Knee Joints ◽  
Strain Gauges ◽  
Cruciate Ligaments ◽  
Human Knee ◽  
Human Knee Joint ◽  
Ligament Strain ◽  
Good Agreement

The kinematics of the human knee joint and the strain of the ligaments as a function of flexion are determined analytically and experimentally. The experimental results were obtained in 13 tests of four knee joints in which the strain in each of the two collateral and two cruciate ligaments was measured with mercury strain gauges while the tibia was rotated through a flexion angle of 130 deg. The values of the relative ligament strain obtained from the analytical model are in good agreement with the experimental results.

scholarly journals Network of flexible capacitive strain gauges for the reconstruction of surface strain

2015 ◽  
Vol 26 (5) ◽  
pp. 055103 ◽  
Author(s):  
Jingzhe Wu ◽  
Chunhui Song ◽  
Hussam S Saleem ◽  
Austin Downey ◽  
Simon Laflamme
Keyword(s):  
Surface Strain ◽  
Strain Gauges ◽  
Capacitive Strain

Characterization of Interdigital Capacitive Strain Gauges by Direct Write Technology

2005 ◽  
Author(s):  
Jinggao Li ◽  
Jon P. Longtin ◽  
Szymon Tankiewicz ◽  
Andrew Gouldstone ◽  
Sanjay Sampath
Keyword(s):  
Printed Circuit Boards ◽  
Thermal Spray Technology ◽  
Mechanical Tests ◽  
Ultrafast Laser ◽  
Strain Gauges ◽  
Gauge Factor ◽  
Direct Write ◽  
Circuit Boards ◽  
Capacitive Strain ◽  
Controlled Deposition

Interdigitated capacitive strain gauges have several distinct advantages over resistive-based strain gauges, particularly for applications in harsh environments, such as high-temperature environments. In this work capacitive strain gauges have been fabricated using thermal spray technology. Gauges are fabricated using both a direct-write approach where the gauge is fabricated using a computer-controlled deposition system and by ultrafast laser micromachining in which blanket coatings sprayed onto a substrate are subsequently laser micrornachined. Silver coatings were sprayed onto plastic, polymer, composites, fiberglass and alumina to form the strain gauges. An ultrafast laser machining technique was used to fabricate capacitive strain gauges on copper coated printed circuit boards as well as NiCr coatings on alumina substrate. The typical capacitance of strain gauge was in the range of 5∼25 pF. Mechanical tests included gauge factor, linearity and zero shift. Temperature-based measurements include the temperature coefficient of capacitance (TCC) measurements and thermal cycling tests. The devices show promise for use in wireless strain monitoring applications.

Experimental Investigation of GFRP Laminate Thin-Walled Column Subjected to Uniform Compression

2015 ◽  
Vol 240 ◽  
pp. 185-190
Author(s):  
Paweł Czapski ◽  
Tomasz Kubiak ◽  
Mariusz Urbaniak
Keyword(s):  
Experimental Investigation ◽  
Cross Section ◽  
Measurement Technique ◽  
Inflection Point ◽  
Buckling Load ◽  
Strain Gauges ◽  
Isotropic Layer ◽  
Uniform Compression ◽  
Layer Arrangement ◽  
Thin Walled

This paper presents the results of experimental investigation of thin-walled GFRP laminate columns with square cross-section subjected to uniform compression. Column under consideration are made of eight ply laminate with different quasi-isotropic layer arrangement. The following three cases of layers arrangement are taken into consideration: CS1 [45/-45/45/-45]S, CS2 [45/-45/0/0]Sand CS3 [45/-45/45/0]S. The analysed columns have the length of 250 mm and following cross-section dimensions (width × height × thickness of the wall): 82 × 82 × 2.08 mm.The main aim of experimental investigation has been to compare the way of buckling load and postbuckling behaviour determinations. The layer arrangement influence on buckling load and postbuckling stiffness have been also checked. Two different methods (P-w2method and "inflection point" method) of determining buckling forcePcrand two different measurement technique (i.e. strain-gauges technique and stereographic transformations technique) have been employed.

Novel approach to dynamic knee laxity measurement using capacitive strain gauges

2015 ◽  
Vol 23 (10) ◽  
pp. 2868-2875 ◽  
Author(s):  
Martin Zens ◽  
Philipp Niemeyer ◽  
Anke Bernstein ◽  
Matthias J. Feucht ◽  
Jan Kühle ◽  
...  
Keyword(s):  
Knee Laxity ◽  
Strain Gauges ◽  
Novel Approach ◽  
Capacitive Strain

Effects of Osmium Tetroxide on the Rabbit Knee Joint Normal Synovial Membrane

1987 ◽  
Vol 16 (1) ◽  
pp. 121-129
Author(s):  
M. Möttönen ◽  
M. Pantio ◽  
T. Nevalainen
Keyword(s):  
Knee Joint ◽  
Synovial Membrane ◽  
Osmium Tetroxide ◽  
Rabbit Knee
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