scholarly journals Temperature and Stress Effects on the Compressive Creep Behavior of Parallel Strand Bamboo

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yanyan Liu ◽  
Yulin Bian ◽  
Dong He ◽  
Jiao Liu ◽  
Aiping Zhou
Keyword(s):  
Creep Behavior ◽  
Mechanical Performance ◽  
Compressive Property ◽  
Temperature Dependent ◽  
Short Term ◽  
Creep Tests ◽  
Burgers Model ◽  
Stress Effects ◽  
Term Creep ◽  
Short Term Creep

Parallel strand bamboo (PSB) is an engineered bamboo product fabricated using crushed bamboo fiber bundles. Recently, this product finds applications in the civil engineering field. It is expected that the use of this composite will continue to grow because of its excellent mechanical performance, relatively low variability in material properties, and shape standardization. Modern bamboo structures made from PSB composites may be subjected to temperature variations during service. So far, however, there has been little discussion about the temperature-dependent creep. In this study, an investigation was carried out on the short-term behavior of the compressive property of PSB. A stress range of 8 to 64 MPa over a temperature range of 25°C to 75°C was considered in the 24-hour creep tests. In addition, Burgers model was adopted to describe the short-term creep behavior of PSB. Temperature and stress effects on the creep compliance of the Burgers model were also discussed.

Evaluation of Short-term Creep Behavior of PE-HD after Aging in Oil Derivatives

2018 ◽  
Vol 26 (3) ◽  
pp. 243-250 ◽  
Author(s):  
Ayrton Alef Castanheira Pereira ◽  
José Roberto Moraes d'Almeida ◽  
Thiago Motta Linhares Castro
Keyword(s):  
Creep Behavior ◽  
Diesel Oil ◽  
Aging Effects ◽  
Short Term ◽  
Creep Tests ◽  
Before And After ◽  
Oil Derivatives ◽  
Term Creep ◽  
Effects Of Aging ◽  
Short Term Creep

The creep behavior of a high density polyethylene (PE-HD) was evaluated before and after aging in contact with gasoline and diesel oil. Four viscoelastic models were used to assess changes in creep properties of the material: three parameters model, four parameters model, stretched Burgers model and Findley Law. Viscoelastic properties, stationary creep rate and compliance were used to analyze and compare the behavior between samples. A strain increase could be seen in aged samples in comparison with as-received ones, caused by plasticization due to aging effects. An increase in flexibility and decrease in stiffness in aged samples was also noted. This work also shows that the effects of aging on the creep response of a polymeric material can be analyzed using short term creep tests.

Predicting Collapse Times for Corrugated Boxes Under Constant Top Load Using Short-Term Creep Tests

2005 ◽  
Vol 33 (4) ◽  
pp. 11932
Author(s):  
DR Petersen ◽  
RE Link ◽  
G Burgess ◽  
SP Singh ◽  
M Srinangyam
Keyword(s):  
Short Term ◽  
Creep Tests ◽  
Term Creep ◽  
Short Term Creep

Effect of Double Aging Heat Treatment on the Short-Term Creep Behavior of the Inconel 718

2016 ◽  
Vol 25 (6) ◽  
pp. 2307-2317 ◽  
Author(s):  
Felipe Rocha Caliari ◽  
Kátia Cristiane Gandolpho Candioto ◽  
Antônio Augusto Couto ◽  
Carlos Ângelo Nunes ◽  
Danieli Aparecida Pereira Reis
Keyword(s):  
Heat Treatment ◽  
Creep Behavior ◽  
Inconel 718 ◽  
Short Term ◽  
Aging Heat Treatment ◽  
Double Aging ◽  
Term Creep ◽  
Short Term Creep

scholarly journals Microstructural Evolution and Short-Term Creep Rupture of the Simulated HAZ in T92 Steel Normalized at Different Temperatures

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1310 ◽  
Author(s):  
Tai-Jung Wu ◽  
Chien-Chun Liao ◽  
Tai-Cheng Chen ◽  
Ren-Kae Shiue ◽  
Leu-Wen Tsay
Keyword(s):  
Grain Boundaries ◽  
Elevated Temperatures ◽  
Creep Rupture ◽  
Infrared Heating ◽  
Short Term ◽  
Creep Tests ◽  
Steel Tubes ◽  
Austenite Grain ◽  
Term Creep ◽  
Short Term Creep

T92 steel tubes have been widely applied in advanced supercritical boilers to replace Gr.91 tubes. Simulated samples with microstructures similar to those present in the heat-affected zone (HAZ) of a T92 steel weld were subjected to short-term creep tests in the study. T92 steel tubes were normalized at either 1213 K (L) or 1333 K (H) for 1 h, followed by tempering (T) at 1033 K for 2 h. After the normalizing and tempering treatments, the HT samples comprised finer precipitates but in greater numbers along the prior austenite grain boundaries (PAGBs) and martensite lath boundaries, as compared with those of the LT samples. The HAZ microstructures in the T92 steel welds were simulated by using an infrared heating system, which included over-tempering (OT, below AC1) and partial transformation (PT, slightly below AC3) zones. Martensite laths in the OT sample were more likely to be replaced by numerous cellular structures or subgrains together with spherodized carbides mainly located at the lath and austenite grain boundaries. Furthermore, coarser but fewer carbides were found along the refined lath and grain boundaries in the PT samples, in comparison with other samples in each group. Short-term creep tests showed that the PT samples were more likely to fracture than other samples in each group. Moreover, under the same testing conditions, the microstructures of T92 steel were more stable and resistant to degradation than those of T91 steel after welding or loading at elevated temperatures. Such events were responsible for higher creep resistance of the simulated T92 samples than that of the simulated T91 samples under the same creep-rupture conditions.

scholarly journals Time-temperature behavior of carbon/epoxy laminates under creep loading

2020 ◽  
Author(s):  
Heitor L. Ornaghi ◽  
José Humberto S. Almeida ◽  
Francisco M. Monticeli ◽  
Roberta M. Neves ◽  
Maria Odila H. Cioffi
Keyword(s):  
Composite Laminates ◽  
Material Behavior ◽  
Short Term ◽  
Creep Tests ◽  
Advanced Composite ◽  
Wide Range ◽  
Temperature Superposition ◽  
Term Creep ◽  
Creep Loading ◽  
Short Term Creep

Abstract The time-temperature creep behavior of advanced composite laminates is herein determined through a comprehensive set of experiments and analytical modeling. A complete structure versus property relationship is determined through a wide range of temperature and applied stress levels at the three states of the composite: glassy, glass transition, and rubbery regions. Weibull, Eyring, Burger, and Findley models are employed to predict the experimental data and to better elucidate the material behavior. Experimental creep tests are carried out under ten min and two days aiming at calibrating fitting parameters, which are essential to validate short-term creep tests. The Weibull and Eyring models are more suitable for determining the time-temperature superposition (TTS) creep response in comparison to the Burger and Findley models.

scholarly journals Creep Behaviour of Modified Mar-247 Superalloy

2016 ◽  
Vol 61 (2) ◽  
pp. 701-704 ◽  
Author(s):  
M. Cieśla ◽  
M. Mańka ◽  
F. Binczyk ◽  
P. Gradoń
Keyword(s):  
Creep Behaviour ◽  
Rupture Life ◽  
Coarse Grained ◽  
Short Term ◽  
Creep Tests ◽  
Nickel Based Superalloy ◽  
Test Conditions ◽  
Accelerated Creep ◽  
Term Creep ◽  
Short Term Creep

Abstract The paper presents the results of analysis of creep behaviour in short term creep tests of cast MAR-247 nickel-based superalloy samples made using various modification techniques and heat treatment. The accelerated creep tests were performed under temperature of 982 °C and the axial stresses of σ = 150 MPa (variant I) and 200 MPa (variant II). The creep behaviour was analysed based on: creep durability (creep rupture life), steady-state creep rate and morphological parameters of macro- and microstructure. It was observed that the grain size determines the creep durability in case of test conditions used in variant I, durability of coarse-grained samples was significantly higher.

Research on Rheological Properties of Room-Temperature Curing Epoxy Adhesive

2013 ◽  
Vol 639-640 ◽  
pp. 354-358 ◽  
Author(s):  
Hui Li ◽  
Ying She Luo ◽  
Jian Jun Xie ◽  
Sheng Ming Chen
Keyword(s):  
Mechanical Properties ◽  
Rheological Model ◽  
Room Temperature ◽  
Epoxy Adhesive ◽  
Test Results ◽  
Short Term ◽  
Creep Tests ◽  
C 30 ◽  
Term Creep ◽  
Short Term Creep

The rheological mechanical properties of two kinds of self-designed epoxy adhesive curing systems were studied in this paper through the dynamic and static thermodynamics instrument named EPLEXOR 500N made by GABO® company in Germany. Short-term creep tests were carried out under three different temperature conditions of 20°C, 30°C and 40°C and the rheological model is developed to describe the materials creep law. In addition, the test results from the two different epoxy adhesive are also compared and analyzed.

scholarly journals The Effect of Normalizing Temperature on the Short-Term Creep Rupture of the Simulated HAZ in Gr.91 Steel Welds

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1072 ◽  
Author(s):  
Hao-Wei Wu ◽  
Tai-Jung Wu ◽  
Ren-Kae Shiue ◽  
Leu-Wen Tsay
Keyword(s):  
Creep Resistance ◽  
Lath Martensite ◽  
Heating System ◽  
Steel Tube ◽  
Infrared Heating ◽  
Short Term ◽  
Creep Tests ◽  
Steel Welds ◽  
Term Creep ◽  
Short Term Creep

As-received Gr.91 steel tube was normalized at either 940 or 1060 °C for 1 h, followed by Ar-assisted cooling to room temperature, then tempered at 760 °C for 2 h. Those samples were designated as 940NT or 1060NT samples. An infrared heating system was used to simulate HAZ microstructures in the weld, which included over-tempering (OT) and partial transformation (PT) zones. The results of short-term creep tests showed that normalizing at higher temperature improved the creep resistance of the Gr.91 steel. By contrast, welding thermal cycles would shorten the creep life of the Gr.91 steel. Among the tested samples in each group, the PT samples had the shortest life to rupture, especially the 940NT-PT sample. The microstructures of the PT samples comprised of fine lath martensite and ferrite subgrains with carbides decorating the grain and subgrain boundaries. Excessive dislocation recovery, rapid coalescence of refined martensite laths, and growth of ferrite subgrains were responsible for the poorer creep resistance of the PT samples relative to those of the other samples.

Effects of fiber size on short-term creep behavior of wood fiber/HDPE composites

2014 ◽  
Vol 55 (3) ◽  
pp. 693-700 ◽  
Author(s):  
Wei-Hong Wang ◽  
Hai-Bing Huang ◽  
Hu-Hu Du ◽  
Haigang Wang
Keyword(s):  
Creep Behavior ◽  
Wood Fiber ◽  
Short Term ◽  
Fiber Size ◽  
Term Creep ◽  
Short Term Creep
Sign in / Sign up

Export Citation Format

Share Document