scholarly journals Determination of Activation Energy and Prediction of Long-Term Strength of Creep Rupture for Alloy Inconel 740/740H: A Method Based on a New Tensile Creep Rupture Model

2021 ◽  
Author(s):  
L. Chen ◽  
Z. Dong ◽  
X. L. Song ◽  
J. Jia ◽  
Z. D. Xiang
Keyword(s):  
Activation Energy ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Term Strength ◽  
Rupture Model

Creep–rupture model of aluminum alloys: Cohesive zone approach

2014 ◽  
Vol 229 (8) ◽  
pp. 1343-1347 ◽  
Author(s):  
Kyungmok Kim
Keyword(s):  
Aluminum Alloys ◽  
Cohesive Zone ◽  
Rupture Life ◽  
Stress Rupture ◽  
Creep Rupture ◽  
Time Dependent ◽  
Element Analysis ◽  
Rupture Model ◽  
Term Creep

In this article, a creep–rupture model of aluminum alloys is developed using a time-dependent cohesive zone law. For long-term creep rupture, a time jump strategy is used in a cohesive zone law. Stress–rupture scatter of aluminum alloy 4032-T6 is fitted with a power law form. Then, change in the slope of a stress-rupture line is identified on a log–log scale. Implicit finite element analysis is employed with a model containing a cohesive zone. Stress–rupture curves at various given temperatures are calculated and compared with experimental ones. Results show that a proposed method allows predicting creep–rupture life of aluminum alloys.

scholarly journals Determination of Long-Term Creep Properties for 316H Steel Using Short-Term Tests on Pre-strained Material

2021 ◽  
Author(s):  
H. Zhou ◽  
A. Mehmanparast ◽  
K. Nikbin
Keyword(s):  
Mechanical Response ◽  
Tensile Tests ◽  
Primary Objective ◽  
Creep Rupture ◽  
Creep Ductility ◽  
Creep Properties ◽  
Material State ◽  
Term Creep

AbstractDetermination of long-term creep rupture properties for 316H steel is both costly and time-consuming and given the level of scatter in the data would need substantial number of tests to be performed. The primary objective of this study is to estimate the long-term creep properties of cross-weld (XW) and as-received (AR) 316H stainless steel by performing accelerated tests on pre-compressed (PC) material. In this work, uniaxial creep rupture tests have been performed on XW specimens and the results have been used to establish a correlation with accelerated test results on the PC material. Moreover, tensile tests have been performed on XW specimens at room temperature and 550 °C to examine the pre-conditioning effects on the mechanical response of the material. Similar power-law creep properties have been found for the creep strain rate and rupture time behaviour of the XW and PC specimens. It also has been found that the creep ductility data points obtained from XW and PC specimens fall upon the estimated trend for the AR material at 550 °C when the data are correlated with the applied stress normalised by 0.2% proof stress. The results show that the long-term creep properties of the XW and AR material can be estimated in much shorter time scales simply by performing tests on the PC material state.

Evaluation of DBTT and Creep Properties of Aged Main Valve Casing by Using Small Punch Specimens

2005 ◽  
Vol 297-300 ◽  
pp. 1470-1476 ◽  
Author(s):  
Takayuki Sugimoto ◽  
Shinichi Komazaki ◽  
Toshihei Misawa
Keyword(s):  
Rupture Strength ◽  
Cast Steel ◽  
Creep Rupture ◽  
Creep Properties ◽  
Uniaxial Test ◽  
Uniaxial Creep ◽  
High Temperature Components ◽  
Main Steam

Both the change in DBTT and the degradation of creep properties of the aged CrMoV cast steel which had been actually used as a main steam valve were evaluated from the conventional SP test and the SP creep (SP-C) test using by SP test specimens. The CVN DBTTs of the virgin and aged steels were estimated to be 280 and 369 K by the conventional SP test, respectively. This increase in DBTT after the long-term service exposure was considered to be caused by carbide-induced embrittlement due to coarse carbides. The SP-C test results revealed that the creep rupture strength of the aged steel was inferior to that of the virgin steel. The ratio, F / s , between the load of the SP-C test (F) and the stress of the uniaxial test ( s) was determined to be 2.4 for the same value of the Larson-Miller parameter in the creep rupture data. This linear relationship enables us to convert the results of the SP-C test into those corresponding to a conventional uniaxial creep test. Consequently, the SP testing method is expected to be appropriate tool for the determination of material deterioration and, in turn, the assessment of remaining-life of high-temperature components.

Long-Term Strength of Polymer Blends from Recycled Materials

2013 ◽  
Vol 43 (3) ◽  
pp. 59-66
Author(s):  
R. K. Krastev ◽  
S. Djoumaliisky ◽  
I. Borovanska
Keyword(s):  
Brittle Fracture ◽  
Polymer Blends ◽  
Calculation Method ◽  
High Density Polyethylene ◽  
Tensile Creep ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Term Strength ◽  
Short Term

Abstract This report presents data on the long-term strength of five composites made of plastic waste. They contain low density polyethylene, high density polyethylene, polypropylene and polystyrene (LDPE, HDPE, PP and PS). Long-term strength is determined experimentally by tensile creep to fracture. The experimentally determined long-term strength is compared to predictions for its probabilistic boundaries. The calculation method of these predictions uses data from short-term experiments. The calculated predictions are true for four compositions which exhibit ductile fracture. The composite containing 50 wt.% PS has the greatest strength (of the tested specimens) and has brittle fracture. Its calculated estimate of long-term strength is not consistent with the experimental one.

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