The impact of aging time on fracture mode of a metastable β alloy with network-like microstructure

2021 ◽  
pp. 105731
Author(s):  
Di Shan ◽  
Le Wang ◽  
Changqing Fang ◽  
Hui Shao ◽  
Dan Fan ◽  
...  
Keyword(s):  
Aging Time ◽  
Fracture Mode ◽  
The Impact

scholarly journals Pengembangan Metode Pengusangan Cepat Fisik Benih Pepaya (Carica papaya L.)

2019 ◽  
Vol 2 (3) ◽  
pp. 7
Author(s):  
Dyah Priandini ◽  
Muhamad Rahmad Suhartanto ◽  
Abdul Qadir
Keyword(s):  
Moisture Content ◽  
Aging Time ◽  
Seed Quality ◽  
Block Design ◽  
Accelerated Aging ◽  
Seed Moisture Content ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
The Impact ◽  
Papaya Seed

Development of papaya fruit production is influenced by the availability of seed quality. High seed quality is maintained during seed storage. Estimation of vigor in relation to storability can be detected by accelerated aging test. This research aims to develop physicall accelerated aging test by, 1)determine the impact of physical accelerated aging on vigor and viability parameters on papaya seed variety Callina and Sukma, 2) determine the levels of seed moisture content and effective period of physicall accelerated aging to predict vigor of papaya seed. This research was conducted at the Laboratory of Seed Science and Technology and Green House Leuwikopo, Department of Agronomy and Horticulture, IPB in January-May 2016 using a randomized complete block design with three replications. Seeds aged by the aging equipment MPC IPB 77-1 MMM. The results showed that the aging time decreased germination value in papaya seed variety Callina and Sukma with equation y=-0.1389x3+3.3333x2–25.25x+81.5 and y=0.0171x3+0.2028x2-9.9956x+81.095. Effective imbibition is 96 hour with moisture content 63-70% in both varieties. The effective of aging time treatment at 0x4, 1x4, 2x4, 3x4, dan 4x4 minutes.Keywords:imbibition, moisture content, viability, vigor

Influence of Temperature on Ductile-Fragile Behavior

2014 ◽  
Vol 802 ◽  
pp. 383-387
Author(s):  
C.A. Silva ◽  
R.C.R. Nascimento ◽  
M.S. Martins ◽  
M.C.S. Freitas
Keyword(s):  
Fracture Mode ◽  
Impact Energy ◽  
Impact Test ◽  
Evaluation Criteria ◽  
Test Body ◽  
Gravitational Potential Energy ◽  
Machine Component ◽  
Whole Process ◽  
Before And After ◽  
The Impact

The article to be presented will cover the whole process done in a fracture test for impact, taking into account the thermal treatment of the sample to be studied. The main objective of this article is to observe, verify, analyze and understand how the temperature difference of several samples influences the type and appearance of the fracture. The impact test have a great importance in industry, is through this that you can verify that the material is ideal for application in the production of equipment and vehicles that operate in high or low temperatures. The evaluation criteria of this trial are the energy absorbed by the sample, and the percentage of its characteristic lateral extension, and the percentage of fracture, ductile or fragile, and corresponding to a ductile fracture mode, in which the test at higher temperatures, the impact energy is relatively large, and fragile fracture mode, being one that as the temperature decreased, the impact energy will suffer decline. The most important result of the impact test is the measure of the energy absorbed by the test body to deform and break, measured by the variance of the gravitational potential energy of the hammer (machine component of the impact test) before and after impact. Therefore, providing the conclusion that the smaller the energy absorbed by the sample, more fragile it is depending on the temperature applied.

scholarly journals Numerical study on the fracture characteristics and failure mode of hard coal under coupled static and dynamic loads

2020 ◽  
Vol 192 ◽  
pp. 04002
Author(s):  
Lihai Tan ◽  
Ting Ren ◽  
Xiaohan Yang ◽  
Xueqiu He
Keyword(s):  
Fracture Mode ◽  
Stress Level ◽  
Coupling Effect ◽  
Numerical Study ◽  
Dynamic Loads ◽  
Hard Coal ◽  
Fracture Characteristics ◽  
Shpb Test ◽  
Static And Dynamic Loads ◽  
The Impact

It has been well accepted by mining researchers that coal tends to undergo abrupt fracture under the coupling effect of dynamic and static loads. Hence, the study of influence of coupled static and dynamic loads on coal failure behaviour is meaningful for the understanding of coal burst. In this paper, PFC modelling of SHPB test is adopted to investigate the fracture mode and energy evolution of Australian hard coal under different combinations of pre-stress levels and impact velocities. Results have shown that high dynamic load will make the fracture mode and energy release of coal samples more violent even the static load is low. Although the strain energy increases with pre-stress level, the kinetic energy remains on a low level with the increase of pre-stress level when the impact velocity is 4 m/s.

scholarly journals Comparative Study of Using Sea-Water for Enhanced Oil Recovery in Carbonate and Sandstone Reservoirs: Effects of Temperature and Aging Time on Oil Recovery

2018 ◽  
Vol 7 (2) ◽  
pp. 1-13
Author(s):  
Madi Abdullah Naser ◽  
Mohamed Erhayem ◽  
Ali Hegaig ◽  
Hesham Jaber Abdullah ◽  
Muammer Younis Amer ◽  
...  
Keyword(s):  
Aging Time ◽  
Oil Recovery ◽  
Sea Water ◽  
Essential Element ◽  
Recovery Process ◽  
Spontaneous Imbibition ◽  
Effect Of Temperature ◽  
Injection Process ◽  
Reservoir Conditions ◽  
The Impact

Oil recovery process is an essential element in the oil industry, in this study, a laboratory study to investigate the effect of temperature and aging time on oil recovery and understand some of the mechanisms of seawater in the injection process. In order to do that, the sandstone and carbonate cores were placed in the oven in brine to simulate realistic reservoir conditions. Then, they were aged in crude oil in the oven. After that, they were put in the seawater to recover, and this test is called a spontaneous imbibition test. The spontaneous imbibition test in this study was performed at room temperature to oven temperature 80 oC with different sandstone and carbonate rock with aging time of 1126 hours. The result shows that the impact of seawater on oil recovery in sandstone is higher than carbonate. At higher temperature, the oil recovery is more moderate than low temperature. Likewise, as the aging time increase for both sandstone and carbonate rocks the oil recovery increase. 

On the Impact Tensile Behavior of Nylon and Aramid Silks for Parachute

2013 ◽  
Vol 821-822 ◽  
pp. 1365-1371
Author(s):  
Bing Hou ◽  
Xuan Chen ◽  
Lei Zhao ◽  
Yu Long Li
Keyword(s):  
Fracture Mode ◽  
Loading Rate ◽  
Tensile Behavior ◽  
Rate Effect ◽  
Shear Direction ◽  
Split Hopkinson ◽  
The Impact

The impact tensile behaviors of four parachute cloths have been studied experimentally by using Split Hopkinson Tensile Bars (SHTB). The force/strain curves at different loading velocities as well as the fracture mode are obtained for each material. Obvious loading rate effect was observed for both the strengths and the failure strains. The three Nylon silks are fractured mostly at the root of specimen/clamps connections and the Aramid silk is inclined to fracture in the middle of the specimen and in the shear direction.

Effect of Thermal Aging on Microstructural Evolution in Ferrite of Duplex Stainless Steel in Nuclear Power Plant Applications

2017 ◽  
Vol 898 ◽  
pp. 818-825
Author(s):  
B. Zhang ◽  
F. Xue ◽  
S.L. Li ◽  
Xi Tao Wang ◽  
N.N. Liang ◽  
...  
Keyword(s):  
Aging Time ◽  
Thermal Aging ◽  
Atom Probe Tomography ◽  
Nuclear Power ◽  
Impact Test ◽  
Atom Probe ◽  
Nanoindentation Test ◽  
Α Phase ◽  
The Impact ◽  
Duplex Steels

Z3CN20-09M duplex steels are thermally aged at 400oC for up to 20,000 h. The mechanical properties have been characterized by Charpy V-notch impact test and nanoindentation test. It is found that the nanohardness in ferrite increases and the impact toughness decreases with aging time. Moreover, the distribution of alloying elements has been carefully characterized using atom probe tomography (APT). The results indicate that the ferrite decomposes into Cr-rich α' and Cr-lean α phase during the thermal aging and Ni-rich G-phase forms in ferrite. The effect of aging time on solute nanostructure has been investigated systematically.

Effect of Impact Compression on Age Hardening Behavior of Aluminum Alloys

2014 ◽  
Vol 566 ◽  
pp. 409-414 ◽  
Author(s):  
Yuki Kitani ◽  
Keitaro Horikawa ◽  
Hidetoshi Kobayashi ◽  
Kenichi Tanigaki ◽  
Tomo Ogura ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Aging Time ◽  
Point Defects ◽  
Solution Treatment ◽  
Age Hardening ◽  
Impact Compression ◽  
6061 Aluminum Alloy ◽  
Hardening Behavior ◽  
The Impact

The effect of impact compression on age hardening behavior was examined for Meso20 and 6061 aluminum alloys using a single stage gun. The hardness of Meso20 and 6061 aluminum alloy applied with an impact compression (about 5.0GPa) after the solution treatment increased with the aging time. The cluster of point defects like stacking fault tetrahedral (SFT) was observed in the 6061 aluminum alloys with the impact compression (5.3GPa) after the solution treatment. Even after the impact compression, distribution of the aging precipitates was clearly identified.

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