Interpreting Load History in Limb-Bone Diaphyses: Important Considerations and Their Biomechanical Foundations JOHN G. SKEDROS

2011 ◽  
pp. 169-236 ◽  
Keyword(s):  
Load History ◽  
Limb Bone

Application of the Strip Yield Model to Crack Growth Predictions for Structural Steel

2010 ◽  
Vol 57 (1) ◽  
pp. 1-20
Author(s):  
Małgorzata Skorupa ◽  
Tomasz Machniewicz
Keyword(s):  
Structural Steel ◽  
Crack Growth ◽  
Model Calibration ◽  
Load History ◽  
Yield Model ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Constraint Factors ◽  
Strip Yield Model ◽  
Closure Mechanism

Application of the Strip Yield Model to Crack Growth Predictions for Structural SteelA strip yield model implementation by the present authors is applied to predict fatigue crack growth observed in structural steel specimens under various constant and variable amplitude loading conditions. Attention is paid to the model calibration using the constraint factors in view of the dependence of both the crack closure mechanism and the material stress-strain response on the load history. Prediction capabilities of the model are considered in the context of the incompatibility between the crack growth resistance for constant and variable amplitude loading.

Hind Limb Bone Proportions Reveal Unexpected Morphofunctional Diversification in Xenarthrans

2021 ◽  
Author(s):  
Sarah K. Marshall ◽  
Kyle B. Spainhower ◽  
Brandon T. Sinn ◽  
Thomas P. Diggins ◽  
Michael T. Butcher
Keyword(s):  
Hind Limb ◽  
Limb Bone

Limb bone strength and habits in large glyptodonts

Lethaia ◽  
1995 ◽  
Vol 28 (3) ◽  
pp. 189-196 ◽  
Author(s):  
RICHARD A. FARIÑA
Keyword(s):  
Bone Strength ◽  
Limb Bone

scholarly journals Limb bone allometry during postnatal ontogeny in non-avian dinosaurs

2010 ◽  
pp. no-no ◽  
Author(s):  
Brandon M. Kilbourne ◽  
Peter J. Makovicky
Keyword(s):  
Postnatal Ontogeny ◽  
Limb Bone

A taphonomic study of bone modification and of tooth-mark patterns on long limb bone portions by suids

2009 ◽  
Vol 19 (3) ◽  
pp. 345-363 ◽  
Author(s):  
S. D. Domínguez-Solera ◽  
M. Domínguez-Rodrigo
Keyword(s):  
Limb Bone ◽  
Bone Modification

On the Measurement of Material Creep Parameters by Nanoindentation

2004 ◽  
Vol 841 ◽  
Author(s):  
J. A. LaManna ◽  
W. C. Oliver ◽  
G. M. Pharr
Keyword(s):  
Material Constant ◽  
Uniaxial Stress ◽  
Complete Characterization ◽  
Indentation Load ◽  
Amorphous Selenium ◽  
Load History ◽  
Time Data ◽  
Creep Equation ◽  
Uniaxial Creep ◽  
Material Creep

ABSTRACTPrevious studies of how material creep parameters can be measured by nanoindentation testing have focused mostly on measurement of the stress exponent for creep, n, and the activation energy, Qc. However, a more complete characterization requires that the material constant A in the uniaxial creep equation εu =Aσn (where εu is the uniaxial strain rate and σ is the uniaxial stress) also be evaluated. Here, we begin to address this issue by performing simple nanoindentation creep experiments in amorphous selenium at temperatures above and below the glass transition. At 35°C and above, the material exhibits a simple linear viscous creep behavior that is load history independent. This allows the parameter A to be determined from the indentation load-displacement-time data by means of an analytical solution. To examine the validity of the approach, values of the parameter A measured in nanoindentation tests are compared to independent measurements obtained in uniaxial tension creep experiments.

scholarly journals Assessment of the Deterioration State of Post-Installed Bonded Anchors Using Ultrasonic

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2077
Author(s):  
Oliver Zeman ◽  
Michael Schwenn ◽  
Martin Granig ◽  
Konrad Bergmeister
Keyword(s):  
Maximum Load ◽  
Assessment Method ◽  
Load Level ◽  
Experimental Investigations ◽  
Load History ◽  
Anchor System ◽  
Ultrasonic Methods ◽  
Building Maintenance ◽  
History Of ◽  
Set Up

The assessment of already installed anchorages for a possible exceeding of the service load level is a question that is gaining more and more importance, especially in building maintenance. Bonded anchors are of particular interest here, as the detection of a capacity reduction or load exceedance can cause damage to the concrete-bonded mortar behavior. This article investigates the extent to which ultrasonic methods can be used to make a prediction about the condition of anchorages in concrete and about their load history. A promising innovative assessment method has been developed. The challenges in carrying out the experimental investigations are the arrangement of the transducers, the design of the test set-up and the applicability of direct, indirect or semidirect ultrasonic transmission. The experimental investigations carried out on a test concrete mix and a bonded anchor system show that damage to the concrete structure can be detected by means of ultrasound. The results indicate the formation of cracks and therefore a weakening of the response determined by means of direct, indirect and semidirect ultrasonic transmission. However, for application under non-laboratory conditions and on anchors with unknown load history, the calibration with a reference anchor and the identification of the maximum load is required. This enables a referencing of the other loaded anchors to the unloaded conditions and allows an estimation of the load history of individual anchors.

Sign in / Sign up

Export Citation Format

Share Document