Accurate Stress Return Strategies for Hardening-Softening Plasticity

2009 ◽  
Author(s):  
B. Tahar ◽  
R.S. Crouch
Keyword(s):  
Accurate Stress

Detailed Crack-Tip Stress Field Description in a Specimen Subjected to Mixed-Mode Loading

2013 ◽  
Vol 577-578 ◽  
pp. 317-320 ◽  
Author(s):  
Lucie Šestáková
Keyword(s):  
Stress Distribution ◽  
Mixed Mode ◽  
Crack Tip ◽  
Analytical Description ◽  
Initial Crack ◽  
Propagation Direction ◽  
Mixed Mode Loading ◽  
Crack Propagation Direction ◽  
Higher Order Terms ◽  
Accurate Stress

A mixed-mode cracked configuration is investigated using the multi-parameter fracture mechanics concept based on the analytical description of the stress/displacement field near a crack tip by means of the Williams series expansion. It is shown that using only one (singular) parameter as it is usual for brittle materials is not sufficient if the accurate stress distribution also further from the crack tip shall be known. Tangential stress distribution in various distances from the crack tip is presented and importance of the higher-order terms of the Williams expansion emphasized. Moreover, initial crack propagation direction is investigated by means of the MTS criterion and utilization of its generalized form is discussed.

Diffraction Plane Dependence of X-ray Elastic Constants of Alumina

1989 ◽  
Vol 33 ◽  
pp. 363-372 ◽  
Author(s):  
Masanori Kurita ◽  
Ikuo Ihara ◽  
Akira Saito
Keyword(s):  
Confidence Intervals ◽  
Elastic Constants ◽  
Stress Measurement ◽  
Diffraction Line ◽  
Diffraction Plane ◽  
X Ray ◽  
Diffraction Angle ◽  
Curve Method ◽  
Voigt Model ◽  
Accurate Stress

AbstractThe 95% confidence linits of the x-ray elastic and stress constants of α-alumina were detemined from seven kinds of diffraction planes by the Gaussian curve method in order to investigate the diffraction plane dependence of the eonstants. No difference in the elastic constants larger than their 95% confidence intervals was observed for most diffraction planes. Also, the measured elastic constants for most planes were closer to the values calculated from the Voigt model than those from the Reuss model. Since the diffraction line of the (410) plane measured with cobalt Kα radiation by using an automated x-ray stress analyzer locates at the highest diffraction angle of 168.4, the use of this plane will allow the most accurate stress measurement. Also, the measured x-ray elastic constants for the (410) plane almost agreed with both values calculated from the Voigt and Reuss models. Therefore, the (410) plane is the most appropriate plane for x-ray stress measurement of alumina.

Telemetry Measurement of Combustion Turbine Blade Vibration in a High Temperature Environment

1986 ◽  
Author(s):  
F. K. Gabriel ◽  
V. Donato
Keyword(s):  
High Temperature ◽  
Strain Gage ◽  
Turbine Blades ◽  
Dynamic Strain ◽  
Blade Vibration ◽  
Temperature Environment ◽  
Full Load Operation ◽  
Accurate Stress ◽  
High Temperature Environment ◽  
Turbine Blading

Rotating component measurements in a combustion turbine continues to be a most difficult instrumentation problem. Measurements in the turbine high temperature environment makes the problem even more challenging. This paper presents an approach in overcoming the difficulties of acquiring accurate stress data from turbine blades during full load operation. Through the application of existing electronics, which were adapted for these special hostile conditions, a reliable telemetry technique for obtaining dynamic strain gage data of combustion turbine blading is demonstrated.

The Strength Analysis of Aircraft Landing Gear Strut Based on ANSYS

2012 ◽  
Vol 490-495 ◽  
pp. 2686-2690 ◽  
Author(s):  
Fei Chen ◽  
Yong Lv ◽  
Zhi Wei Xing
Keyword(s):  
Strain Distribution ◽  
Landing Gear ◽  
Strength Analysis ◽  
Stress And Strain ◽  
Element Analysis ◽  
Damage Prediction ◽  
Aircraft Landing ◽  
Aircraft Landing Gear ◽  
Stress And Strain Distribution ◽  
Accurate Stress

Because the landing gear structure is complicated, it is difficult to draw accurate stress and strain distribution through the theoretical calculation. In this paper, based on the modeling and stress analysis of the buffer mechanism of aircraft landing gear, by converting the stress of a dynamic system into a static stress, the force of the landing gear struts are calculated. This paper analyzes the strength of the aircraft main landing gear by using computer simulation technology and finite element analysis, it provides an effective basis for maintenance and the damage prediction

scholarly journals An Improved Equation for Predicting Compressive Stress in Posttensioned Anchorage Zone

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Young-Ha Park ◽  
Moon-Young Kim ◽  
Jong-Myen Park ◽  
Se-Jin Jeon
Keyword(s):  
Finite Element Method ◽  
Compressive Stress ◽  
Prestressed Concrete ◽  
Approximate Equation ◽  
The Finite Element Method ◽  
Concrete Member ◽  
Design Specifications ◽  
Compressive Stresses ◽  
Aashto Lrfd ◽  
Accurate Stress

Validity of the approximate equation for predicting compressive stress in the posttensioned anchorage zone presented in the AASHTO LRFD Bridge Design Specifications was investigated in this study. Numerical analysis based on the finite element method (FEM) and theoretical analysis showed that the AASHTO formula gives relatively accurate stress values when the effect of duct holes is neglected. However, it was found that the formula can significantly overestimate the stresses in the actual prestressed concrete member with spaces occupied by ducts. Therefore, an improved equation was proposed for the existing AASHTO equation to consider the effect of the duct holes on the stress distribution. This resulted in relatively accurate prediction of the distribution and magnitude of the compressive stresses even with the presence of the duct holes. The proposed equation was also validated by comparing with the stresses measured in the test of a posttensioned full-scale specimen. This study is expected to contribute to the design of the anchorage zone in prestressed concrete structures by suggesting a more reasonable way to assess the appropriateness of anchorage devices.

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