scholarly journals Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis

10.3791/54925 ◽  
2017 ◽  
Author(s):  
Dan Dragomir-Daescu ◽  
Asghar Rezaei ◽  
Susheil Uthamaraj ◽  
Timothy Rossman ◽  
James T. Bronk ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Strength ◽  
Strength Testing ◽  
Quantitative Ct ◽  
Element Analysis

Finite Element Analysis of Die-Strength Testing Configurations for Thin Wafers

2004 ◽  
Vol 127 (2) ◽  
pp. 189-192 ◽  
Author(s):  
X. K. Sun ◽  
X. J. Xin ◽  
Z. J. Pei
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Gradient ◽  
Strength Testing ◽  
Uniform Stress ◽  
Element Analysis ◽  
Ring Configuration ◽  
Die Surface ◽  
Uniform Stress Field ◽  
Point Bend

This paper presents an assessment of four die-strength testing configurations using finite element analysis. The simulation indicates that ring-on-ring configuration is the best because it generates a uniform stress field on a large die surface area. The four-point-bend configuration ranks second and the three-point-bend configuration is third. The pin-on-ring configuration is the worst because the stress gradient is severe in the central region. To minimize uncertainty in the loading positions, it is advised that loading rings or bars with small radii be used.

Determination of fracture strength and fracture energy of (metallo-) ceramics by a wedge loading methodology and corresponding cohesive zone-based finite element analysis

2018 ◽  
Vol 196 ◽  
pp. 56-70 ◽  
Author(s):  
Ann-Sophie Farle ◽  
Jayaprakash Krishnasamy ◽  
Sergio Turteltaub ◽  
Cees Kwakernaak ◽  
Sybrand van der Zwaag ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Energy ◽  
Fracture Strength ◽  
Cohesive Zone ◽  
Element Analysis

scholarly journals Nocturnal oxytocin secretion is lower in amenorrheic athletes than nonathletes and associated with bone microarchitecture and finite element analysis parameters

2013 ◽  
Vol 168 (3) ◽  
pp. 457-464 ◽  
Author(s):  
Elizabeth A Lawson ◽  
Kathryn E Ackerman ◽  
Nara Mendes Estella ◽  
Gabriela Guereca ◽  
Lisa Pierce ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Female Athletes ◽  
Bone Microarchitecture ◽  
Weight Bearing ◽  
Distal Tibia ◽  
Serum Samples ◽  
Quantitative Ct ◽  
Element Analysis ◽  
Cross Sectional

ObjectivePreclinical data indicate that oxytocin, a hormone produced in the hypothalamus and secreted into the peripheral circulation, is anabolic to bone. Oxytocin knockout mice have severe osteoporosis, and administration of oxytocin improves bone microarchitecture in these mice. Data suggest that exercise may modify oxytocin secretion, but this has not been studied in athletes in relation to bone. We therefore investigated oxytocin secretion and its association with bone microarchitecture and strength in young female athletes.DesignCross-sectional study of 45 females, 14–21 years (15 amenorrheic athletes (AA), 15 eumenorrheic athletes (EA), and 15 nonathletes (NA)), of comparable bone age and BMI.MethodsWe used high-resolution peripheral quantitative CT to assess bone microarchitecture and finite element analysis to estimate bone strength at the weight-bearing distal tibia and non-weight-bearing ultradistal radius. Serum samples were obtained every 60 min, 2300–0700 h, and pooled for an integrated measure of nocturnal oxytocin secretion. Midnight and 0700 h samples were used to assess diurnal variation of oxytocin.ResultsNocturnal oxytocin levels were lower in AA and EA than in NA. After controlling for estradiol, the difference in nocturnal oxytocin between AA and NA remained significant. Midnight and 0700 h oxytocin levels did not differ between groups. At the tibia and radius, AA had impaired microarchitecture compared with NA. In AA, nocturnal oxytocin correlated strongly with trabecular and cortical microarchitecture, particularly at the non-weight-bearing radius. In regression models that include known predictors of microarchitecture in AA, oxytocin accounted for a substantial portion of the variability in microarchitectural and strength parameters.ConclusionsNocturnal oxytocin secretion is low in AA compared with NA and associated with site-dependent microarchitectural parameters. Oxytocin may contribute to hypoestrogenemic bone loss in AA.

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