Prediction Method of Long-Term Mechanical Behavior of Largely Deformed Sand Asphalt with Constant Loading Creep Tests

2012 ◽  
Vol 138 (12) ◽  
pp. 1457-1467 ◽  
Author(s):  
Fan Bai ◽  
Xinhua Yang ◽  
Anyi Yin ◽  
Guowei Zeng
Keyword(s):  
Mechanical Behavior ◽  
Prediction Method ◽  
Creep Tests ◽  
Constant Loading

Flexural creep tests and long-term mechanical behavior of fiber-reinforced polymeric composite tubes

2018 ◽  
Vol 193 ◽  
pp. 154-164 ◽  
Author(s):  
Zengqin Yang ◽  
Hui Wang ◽  
Xiaofei Ma ◽  
Fulin Shang ◽  
Yu Ma ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Polymeric Composite ◽  
Fiber Reinforced ◽  
Creep Tests ◽  
Composite Tubes ◽  
Flexural Creep

Lifetime prediction of high-modulus polyethylene yarns subjected to creep using the Larson–Miller methodology

2019 ◽  
Vol 27 (7) ◽  
pp. 400-406
Author(s):  
Jefferson Morais Gautério ◽  
Leonardo Cofferri ◽  
Antonio Henrique Monteiro da Fonsec da Silva ◽  
Felipe Tempel Stumpf
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Polymeric Materials ◽  
Constant Load ◽  
Lifetime Prediction ◽  
High Modulus ◽  
Accelerated Tests ◽  
Creep Tests ◽  
Modulus Polyethylene

The aim of the present work is to apply the Larson–Miller technique for the study of the mechanical behavior under creep of high-modulus polyethylene (HMPE) fibers focused on use as in offshore mooring ropes. Creep is known to be a long-term phenomenon, so in most cases, reproducing such experiments in real time is not feasible, and as the life span of anchoring systems must be in the order of decades, accelerated tests are required to verify the long-term mechanical behavior of the material. The methodology using the Larson–Miller parameter is a well-documented and powerful technique for materials’ lifetime prediction, although seldom applied to polymeric materials. It involves in performing accelerated (high temperature and/or loads) creep tests to determine the parameters that are later used to estimate the rupture time of the material under constant load. It is concluded that the Larson–Miller technique is efficient for calculating the lifetime of HMPE subjected to creep.

Influence of hydrostatic pressure and volumetric strain on the mechanical long term behavior of polymers

2012 ◽  
Vol 32 (6-7) ◽  
pp. 327-333 ◽  
Author(s):  
Tobias Naumann ◽  
Markus Stommel
Keyword(s):  
Hydrostatic Pressure ◽  
Mechanical Behavior ◽  
Free Volume ◽  
Creep Behavior ◽  
Volumetric Strain ◽  
Material Model ◽  
Tensile Creep ◽  
Creep Tests ◽  
Long Term Behavior

Abstract One of the most crucial issues in developing a material model to describe the long term behaviour of polymers is to represent adequately the load dependency of the considered material. In many publications, it is shown that the free volume affects the mechanical behavior of polymers. For a further investigation of the dependency of the creep behavior on free volume, different experiments are presented in this paper. In one experiment, the creep behavior under tension and shear are compared, to see how the different hydrostatic pressures in these tests influence mechanical behavior. Furthermore, tensile creep tests under different hydrostatic pressures are conducted experimentally. The experiments are conducted on a polycarbonate, a polypropylene and a polymethyl methacrylate. It is shown that the hydrostatic pressure has a significant influence on the creep behavior of all three materials. This effect is related to the change of free volume.

The influence of immersed water level on the short- and long-term mechanical behavior of sandstone

2021 ◽  
Vol 138 ◽  
pp. 104631
Author(s):  
Peizhao Chen ◽  
Shibin Tang ◽  
Xin Liang ◽  
Yongjun Zhang ◽  
Chunan Tang
Keyword(s):  
Mechanical Behavior ◽  
Water Level ◽  
Short And Long Term

scholarly journals Study on creep performance of launch canister under long-term storage

2019 ◽  
Vol 43 (2) ◽  
pp. 199-208 ◽  
Author(s):  
Cun-Gui Yu ◽  
Tong-Sheng Sun ◽  
Guang-Yuan Xiao
Keyword(s):  
Residual Deformation ◽  
Bottom Layer ◽  
Tensile Creep ◽  
Creep Model ◽  
Model Parameters ◽  
Creep Tests ◽  
Software Environment ◽  
Long Term Storage ◽  
Term Storage

In this paper, the creep performance of a multi-barrel rocket launch canister under long-term stacking storage is studied. Based on the Bailey–Norton model, a creep model for the frame material of a launch canister was established. Constant stress tensile creep tests under different stress levels at room temperature were carried out on the frame materials of the launch canister and the creep model parameters were obtained by test data fitting. The three-dimensional finite element model of the launch canister was established in the ABAQUS software environment and the creep deformation of the launch canister after long-term stacking storage was studied. The results indicated that the bottom layer of the launch canister frame presented an extended residual deformation when the stacking storage solution with the original support pad was used. Therefore, a position adjustment program of the support pad was put forward. The residual deformation of the launch canister frame after long-term storage could be significantly reduced, thus the performance requirements for the launch canister are guaranteed.

Modified Dyson Continuum Damage Model for Austenitic Steel Alloy

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Seok Jun Kang ◽  
Hoomin Lee ◽  
Jae Boong Choi ◽  
Moon Ki Kim
Keyword(s):  
Damage Model ◽  
Life Time ◽  
Continuum Damage ◽  
Creep Life ◽  
Creep Tests ◽  
Continuum Damage Model ◽  
Thermal Plant ◽  
Uniaxial Creep ◽  
Term Creep

Ultrasuper critical (USC) thermal plants are now in operation around the globe. Their applications include superheaters and reheaters, which generally require high temperature/pressure conditions. To withstand these harsh conditions, an austenitic heat-resistant HR3C (ASME TP310NbN) steel was developed for metal creep resistance. As the designed life time of a typical thermal plant is 150,000 h, it is very important to predict long-term creep behavior. In this study, a three-state variable continuum damage model (CDM) was modified for better estimation of long-term creep life. Accelerated uniaxial creep tests were performed to determine the material parameters. Also, the rupture type and microstructural precipitation were observed by scanning electron microscopy. The creep life of HR3C steel was predicted using only relatively short-term creep test data and was then successfully verified by comparison with the long-term creep data.

Microstructures of Grade 91 Steels Under Long-Term Creep Conditions

2018 ◽  
Author(s):  
Kenji Kako ◽  
Susumu Yamada ◽  
Masatsugu Yaguchi ◽  
Yusuke Minami
Keyword(s):  
Remaining Life ◽  
Martensitic Steels ◽  
Creep Data ◽  
Creep Life ◽  
Creep Tests ◽  
Microstructural Observation ◽  
Type Iv ◽  
Grade 91 ◽  
Term Creep

Type IV damage has been found at several ultra-supercritical (USC) plants that used high-chromium martensitic steels in Japan, and the assessment of the remaining life of the steels is important for electric power companies. The assessment of the remaining life needs long-term creep data for over 10 years, but such data are limited. We have attempted to assess the remaining life by creep tests and by microstructural observation of Grade 91 steels welded pipes which were used in USC plants for over 10 years. Following the results of microstructural observation of USC plant pipes, we find that microstructures, especially distribution of MX precipitates, have large effect on the creep life of Grade 91 steels.

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