scholarly journals Temperature dependent elastic constants and ultimate strength of graphene and graphyne

2012 ◽  
Vol 137 (19) ◽  
pp. 194901 ◽  
Author(s):  
Tianjiao Shao ◽  
Bin Wen ◽  
Roderick Melnik ◽  
Shan Yao ◽  
Yoshiyuki Kawazoe ◽  
...  
Keyword(s):  
Ultimate Strength ◽  
Elastic Constants ◽  
Temperature Dependent

Temperature Dependent Elastic Constants of Directionally Solidified Superalloys

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Chen-Ming Kuo
Keyword(s):  
Experimental Data ◽  
Elastic Constants ◽  
Large Range ◽  
Turbine Blades ◽  
Material Behavior ◽  
Directionally Solidified ◽  
Temperature Dependent ◽  
Temperature Changes ◽  
Life Evaluation ◽  
Precise Knowledge

Directionally solidified superalloys have been extensively used as turbine blade materials to improve creep-rupture and thermal fatigue performances. Turbine blades are subjected to fluctuant temperature changes. Precise knowledge of material behavior at various temperatures is essential in design and service life evaluation of turbine blades. In this study, coaxial model is extended to consider temperature dependent engineering elastic constants. Although no existing theory predicts the temperature dependence engineering elastic constants over large range of temperature, these constants could be estimated based upon very limited experimental data of direction solidification specimens and other temperature dependent materials data. Excellent agreement is observed between estimations and experimental data of 45 deg and 90 deg off directionally solidified direction specimens.

scholarly journals Stress systems in aeolotropie plates. VI

1945 ◽  
Vol 184 (998) ◽  
pp. 289-300 ◽  
Keyword(s):  
Ultimate Strength ◽  
Elastic Constants ◽  
Numerical Work ◽  
Spruce Wood ◽  
Distribution Of Stress

The distribution of stress due to hyperbolic notches in an aeolotropic plank under tension or flexure is discussed theoretically when the plank has two directions of symmetry at right angles. Numerical work is carried out using the elastic constants found in experiments made with specimens cut in the L, T plane from spruce wood which is highly aeolotropic. The calculated stresses are used in conjunction with measurements of ultimate strength to determine the kind of failure which might be expected near notches in a spruce plank under tension.

Prediction on temperature dependent elastic constants of “soft” metal Al by AIMD and QHA

2020 ◽  
Vol 45 ◽  
pp. 92-97 ◽  
Author(s):  
Haijun Zhang ◽  
Chenhui Li ◽  
Philippe Djemia ◽  
Rui Yang ◽  
Qingmiao Hu
Keyword(s):  
Elastic Constants ◽  
Temperature Dependent ◽  
Soft Metal

Temperature-dependent behaviours of electro-elastic constants for the Bi2ZnB2O7 piezoelectric crystal

CrystEngComm ◽  
2021 ◽  
Author(s):  
Feifei Chen ◽  
Chao Jiang ◽  
Fapeng Yu ◽  
Xiufeng Cheng ◽  
Xian Zhao
Keyword(s):  
Elastic Constants ◽  
Temperature Stability ◽  
Piezoelectric Crystal ◽  
Temperature Dependent

The BZBO crystals were found to present good temperature stability of elastic compliances.

scholarly journals Predicting temperature-dependent ultimate strengths of body-centered-cubic (BCC) high-entropy alloys

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
B. Steingrimsson ◽  
X. Fan ◽  
X. Yang ◽  
M. C. Gao ◽  
Y. Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Ultimate Strength ◽  
Optimization Technique ◽  
Model Parameters ◽  
High Entropy Alloys ◽  
Temperature Dependent ◽  
High Entropy ◽  
Concurrent Optimization ◽  
Temperature Regimes ◽  
Alloy Properties

AbstractThis paper presents a bilinear log model, for predicting temperature-dependent ultimate strength of high-entropy alloys (HEAs) based on 21 HEA compositions. We consider the break temperature, Tbreak, introduced in the model, an important parameter for design of materials with attractive high-temperature properties, one warranting inclusion in alloy specifications. For reliable operation, the operating temperature of alloys may need to stay below Tbreak. We introduce a technique of global optimization, one enabling concurrent optimization of model parameters over low-temperature and high-temperature regimes. Furthermore, we suggest a general framework for joint optimization of alloy properties, capable of accounting for physics-based dependencies, and show how a special case can be formulated to address the identification of HEAs offering attractive ultimate strength. We advocate for the selection of an optimization technique suitable for the problem at hand and the data available, and for properly accounting for the underlying sources of variations.

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