Influence of temperature, composition, and grain size on the tensile failure of water ice: Implications for erosion on Titan

2012 ◽  
Vol 117 (E8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Kimberly L. Litwin ◽  
Beth R. Zygielbaum ◽  
Peter J. Polito ◽  
Leonard S. Sklar ◽  
Geoffrey C. Collins
Keyword(s):  
Grain Size ◽  
Tensile Failure ◽  
Influence Of Temperature ◽  
Water Ice

scholarly journals A Notch-Strengthening Effect in Fresh-Water Ice

1990 ◽  
Vol 36 (122) ◽  
pp. 107-111 ◽  
Author(s):  
Wilfrid A. Nixon ◽  
Erland M. Schulson
Keyword(s):  
Grain Size ◽  
Notch Root ◽  
Tensile Tests ◽  
Root Diameter ◽  
Stress Constraint ◽  
Strengthening Effect ◽  
Water Ice ◽  
Controlling Mechanism ◽  
Polycrystalline Ice ◽  
Oriented Polycrystalline

AbstractTensile tests have been performed on notched and unnotched cylindrical samples of randomly oriented polycrystalline ice of controlled grain-size (between 2.2 and 7.3 mm) at a loading rate of 100Pa s−1and at a temperature of −10°C In the notched samples, the notch-root diameter was 80% of the base diameter. A notch-strengthening effect was observed in the large-grained ice, with fracture stresses being up to 50% higher than that for unnotched samples of the same grain-size. This notch-strengthening effect diminished as grain-size decreased, disappearing at a grain-size of ≈3 mm.The notch-strengthening effect is explained in terms of the triaxial stress constraint at the notch root. This triaxial constraint results in a change in the controlling mechanism of fracture from crack propagation in the unnotched samples to crack initiation in the notched samples.

Effects of Temperature, Strain Rate and Grain Size on Superplastic Behavior of Magnesium

2012 ◽  
Vol 488-489 ◽  
pp. 27-34 ◽  
Author(s):  
Muhammad Waseem Soomro ◽  
Thomas Rainer Neitzert
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Superplastic Forming ◽  
Experimental Results ◽  
Superplastic Behavior ◽  
Influence Of Temperature ◽  
Effects Of Temperature ◽  
Temperature Strain

The influence of temperature, grain size and strain rate on superplasticity of magnesium is investigated. Different approaches are compared along with their experimental results to show the variation in the amount of superplasticity by varying above mentioned parameters. At room temperature magnesium alloys usually have poor formability but recent studies of some alloys such as ZE10, AZ31, AZ61 AZ60, AZ80 and AZ91 are pointing that by varying the temperature along with grain size and strain rate improved formability is possible or even superplastic forming of these alloys can be achieved to meet the demands of automotive, aircraft and other weight conscious industries.

scholarly journals Millimeter-sized Dust Grains Surviving the Water-sublimating Temperature in the Inner 10 au of the FU Ori Disk

2021 ◽  
Vol 923 (2) ◽  
pp. 270
Author(s):  
Hauyu Baobab Liu ◽  
An-Li Tsai ◽  
Wen Ping Chen ◽  
Jin Zhong Liu ◽  
Xuan Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Binary Stars ◽  
Thermal Emission ◽  
Dust Grains ◽  
Radio Observations ◽  
Very Large Array ◽  
Water Ice ◽  
Fu Ori ◽  
June July ◽  
Dust Grain

Abstract Previous observations have shown that the ≲10 au, ≳400 K hot inner disk of the archetypal accretion outburst young stellar object, FU Ori, is dominated by viscous heating. To constrain dust properties in this region, we have performed radio observations toward this disk using the Karl G. Jansky Very Large Array in 2020 June–July, September, and November. We also performed complementary optical photometric monitoring observations. We found that the dust thermal emission from the hot inner disk mid-plane of FU Ori has been approximately stationary and the maximum dust grain size is ≳1.6 mm in this region. If the hot inner disk of FU Ori, which is inward of the 150–170 K water snowline, is turbulent (e.g., corresponding to a Sunyaev & Shakura viscous α t ≳ 0.1), or if the actual maximum grain size is still larger than the lower limit we presently constrain, then as suggested by the recent analytical calculations and the laboratory measurements, water-ice-free dust grains may be stickier than water-ice-coated dust grains in protoplanetary disks. Additionally, we find that the free–free emission and the Johnson B- and V-band magnitudes of these binary stars were brightening in 2016–2020. The optical and radio variability might be related to the dynamically evolving protostellar- or disk-accretion activities. Our results highlight that the hot inner disks of outbursting objects are important laboratories for testing models of dust grain growth. Given the active nature of such systems, to robustly diagnose the maximum dust grain sizes, it is important to carry out coordinated multiwavelength radio observations.

Influence of Temperature and Grain Size on Austenite Stability in Medium Manganese Steels

2017 ◽  
Vol 48 (5) ◽  
pp. 2140-2149 ◽  
Author(s):  
Yulong Zhang ◽  
Li Wang ◽  
Kip O. Findley ◽  
John G. Speer
Keyword(s):  
Grain Size ◽  
Influence Of Temperature ◽  
Austenite Stability ◽  
Manganese Steels

scholarly journals Polarimetry of Water Ice Particles Providing Insights on Grain Size and Degree of Sintering on Icy Planetary Surfaces

2018 ◽  
Vol 123 (10) ◽  
pp. 2564-2584 ◽  
Author(s):  
O. Poch ◽  
R. Cerubini ◽  
A. Pommerol ◽  
B. Jost ◽  
N. Thomas
Keyword(s):  
Grain Size ◽  
Planetary Surfaces ◽  
Water Ice ◽  
Ice Particles

scholarly journals The elastic modulus of columnar-grain fresh-water ice

1994 ◽  
Vol 19 ◽  
pp. 13-18 ◽  
Author(s):  
Lorne W. Gold
Keyword(s):  
Grain Size ◽  
Elastic Modulus ◽  
Strain Rate ◽  
Temperature Dependence ◽  
Fresh Water ◽  
Compressive Loading ◽  
Stress And Strain ◽  
Strain Rates ◽  
Water Ice ◽  
Columnar Grain

An analysis is presented of stress and strain measurements made during an investigation of the characteristics of cracks formed in columnar-grain, type S2 fresh-water ice, during uniaxial, compressive loading at the nominal strain rates of 10−3, 10−4 and 10−5s−1, and temperatures of −5°, −10°, −20° and −30°C. The analysis shows that for this range of strain rate and temperature, ice behaves as an anelastic solid. Results are given for the time, grain-size and temperature dependence of the elastic modulus in the plane perpendicular to the long direction of the grains. They are shown to be in reasonable agreement with results of an earlier study of the anelastic behaviour of the same type of ice. It is suggested that the grain-size and temperature dependence of the elastic moduli of ice for this range of strain rate and temperature may be due, in part, to the dependence of the relaxation time on these variables.

Sign in / Sign up

Export Citation Format

Share Document