Application of thermal life prediction model to high-temperature aerospace alloys B1900 + Hf and Haynes 188 (Report)Halford, G.R., Saltsman, J.F., Verilli, M.J. and Arya, V.K. NASA Lewis Research Center Technical Memorandum No NASA TM-4226 1990 12 pp

1991 ◽  
Vol 13 (6) ◽  
pp. 503-503
Keyword(s):  
High Temperature ◽  
Prediction Model ◽  
Life Prediction ◽  
Research Center ◽  
Nasa Lewis Research ◽  
Aerospace Alloys ◽  
Thermal Life ◽  
Life Prediction Model

An Empirical Life Prediction Method of Cold-Stretched Austenitic Stainless Steel

2016 ◽  
Vol 853 ◽  
pp. 67-71
Author(s):  
Yu Han ◽  
Ke Sheng Wang
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Fatigue Life ◽  
Austenitic Stainless Steel ◽  
Prediction Model ◽  
Test Data ◽  
Life Prediction ◽  
Pressure Vessels ◽  
Fatigue Life Prediction ◽  
Life Prediction Model

With the purpose of long-cycle safe operation of cold stretched austenitic stainless steel pressure vessels so as to achieve unification of economy and safety, prediction of fatigue life of S31603 austenitic stainless steel at high temperature is systematic studied. Based on the Hull-Rimmer cavity theory, a fatigue life prediction model applicable to stress controlled is developed. Fatigue test is carried out on the solution annealed and cold stretched S31603 steel at high temperature and corresponding test data is obtained. The fatigue life of the solution annealed and cold stretched materials is predicted by the model and the prediction results are in good agreement with the experimental results. On this basis, the life prediction model coupled with the strain level of cold stretching is further established. Compared with the test data, the prediction results is found to be very satisfactory with an error band less than ±1.5 times. The fatigue life prediction model suitable for stress control at high temperature is simple in form and has a clear and obvious physical significance which points out a new way to predict fatigue life of metal materials.

A Life Prediction Model for LEDs Lamps Based on the Thermal Life Theory

2014 ◽  
Vol 941-944 ◽  
pp. 571-574
Author(s):  
De Zhong Huang ◽  
Ji Hua Wu ◽  
Guo Yong Xu ◽  
Feng Ruan ◽  
Xiao Bao Zhao ◽  
...  
Keyword(s):  
Life Cycle ◽  
Prediction Model ◽  
Life Prediction ◽  
Luminous Flux ◽  
Maximum Amount ◽  
Operating Point ◽  
Thermal Life ◽  
The Relationship ◽  
Total Life ◽  
Life Prediction Model

The photometric, electrical, thermal and life features of LEDs are highly dependent on each other. All these factors should be considered together in order to optimize the operating point of LEDs. A thermal life theory about LEDs is developed. This theory shows the inner inks among photometric thermal and 1ife features of a LED. A life prediction model of LEDs and the relationship between output luminous flux and lifetime was found out by this theory. The life of LEDs can be predicted and find the proper operating point, at which the LED will generate the maximum amount of luminous flux in its total life cycle.

Life Prediction Model for LEDs Based on the Photo-Electro-Thermal-Life Theory

2012 ◽  
Vol 32 (8) ◽  
pp. 0823001 ◽  
Author(s):  
钱敏华 Qian Minhua ◽  
林燕丹 Lin Yandan ◽  
孙耀杰 Sun Yaojie
Keyword(s):  
Prediction Model ◽  
Life Prediction ◽  
Thermal Life ◽  
Life Prediction Model

A New Life Prediction Model Based on Ductility Exhaustion Theory for High Temperature Low Cycle Fatigue of Turbine Disk Alloys

2010 ◽  
Author(s):  
Shun-Peng Zhu ◽  
Rui Sun ◽  
Hong-Zhong Huang ◽  
Ming J. Zuo
Keyword(s):  
High Temperature ◽  
Prediction Model ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Damage Parameter ◽  
Cycle Fatigue ◽  
Stress Effects ◽  
Proposed Model ◽  
Mean Strain ◽  
Life Prediction Model

Based on ductility exhaustion theory and the generalized damage parameter, a new viscosity-based life prediction model is put forward to account for creep and mean strain or stress effects in a low cycle fatigue regime. The mechanisms of loading waveform and cyclic hardening effects are also taken into account within this model. It assumes that damage accrues by means of viscous flow and ductility consumption relates only to plastic strain and creep strain under high temperature low cycle fatigue conditions. The proposed model provides a better prediction on the fatigue behaviors of Superalloy GH4133 than the Goswami’s ductility model and the generalized damage parameter. Compared with the proposed model and the generalized damage parameter, the Goswami’s model cannot properly account for creep and mean stress effects on the low cycle fatigue life. Under non-zero mean strain conditions, the proposed model provides more accurate predictions of GH4133 Superalloy than that with zero mean strains.

Life Prediction of Cold-Stretched Austenitic Stainless Steel at High Temperature

2016 ◽  
Author(s):  
Yu Han ◽  
Kesheng Wang
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Fatigue Life ◽  
Austenitic Stainless Steel ◽  
Prediction Model ◽  
Test Data ◽  
Life Prediction ◽  
Pressure Vessels ◽  
Fatigue Life Prediction ◽  
Life Prediction Model

With the purpose of long-cycle safe operation of cold stretched austenitic stainless steel pressure vessels to achieve unification of economy and safety, prediction of fatigue life of S31603 austenitic stainless steel at high temperature is systematic studied. Based on the Hull-Rimmer cavity theory, a fatigue life prediction model applicable to stress controlled is developed. Fatigue tests were carried out on the solution annealed and cold stretched S31603 steel at high temperature and corresponding test data is obtained. The fatigue life of the solution annealed and cold stretched materials was predicted by the model and the prediction results are in good agreement with the experimental lives. On this basis, the life prediction model coupled with the strain level of cold stretching is further established. Compared with the test data, the prediction results is found to be very satisfactory with an error band less than ±1.5 times. The fatigue life prediction model suitable for stress control at high temperature is simple in form and has a clear and obvious physical significance which points out a new way to predict fatigue life of metal materials.

scholarly journals Life Prediction Model of Mineral Admixture Cement Based-Materials under Early Age CO2-Erosion

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 413
Author(s):  
Saisai Wang ◽  
Jian Chen ◽  
Xiaodong Wen
Keyword(s):  
Prediction Model ◽  
Life Prediction ◽  
Experimental Tests ◽  
Mineral Admixture ◽  
Model Parameters ◽  
Influence Coefficient ◽  
Test Pieces ◽  
Cement Based Materials ◽  
Particle Group ◽  
Life Prediction Model

Most of the existing models of structural life prediction in early carbonized environment are based on accelerated erosion after standard 28 days of cement-based materials, while cement-based materials in actual engineering are often exposed to air too early. These result in large predictions of the life expectancy of mineral-admixture cement-based materials under early CO2-erosion and affecting the safe use of structures. To this end, different types of mineral doped cement-based material test pieces are formed, and early CO2-erosion experimental tests are carried out. On the basis of the analysis of the existing model, the influence coefficient of CO2-erosion of the mineral admixture Km is introduced, the relevant function is given, and the life prediction model of the mineral admixture cement-based material under the early CO2-erosion is established and the model parameters are determined by using the particle group algorithm (PSO). It has good engineering applicability and guiding significance.

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