The effect of Au and Ag additions on the power-law creep behavior of Pb

AbstractVigorous flow of central regions of Ice Stream C, West Antarctica, near the UpC camp ended about the year 1830, based on analysis of a firn and ice core taken at the camp. Ice-stream flow was characterized by repeated fracturing and healing, probably subsurface, especially near the onset of streaming flow. High longitudinal stresses caused fracturing, recrystallization of the ice and elongation of bubbles, and enhanced densification rates of high-density firn indicating power-law-creep behavior.

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Power-law Creep Behavior of Single-phase Metallic Materials: Its Understanding and Unsolved Problems Part 2

Materia Japan ◽

10.2320/materia.49.95 ◽

2010 ◽

Vol 49 (3) ◽

pp. 95-102

Author(s):

Hiroshi Oikawa

Keyword(s):

Power Law ◽

Creep Behavior ◽

Single Phase ◽

Metallic Materials ◽

Power Law Creep

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CREEP ANALYSIS FOR A WIDE STRESS RANGE BASED ON STRESS RELAXATION EXPERIMENTS

International Journal of Modern Physics B ◽

10.1142/s0217979208050589 ◽

2008 ◽

Vol 22 (31n32) ◽

pp. 5413-5418 ◽

Cited By ~ 22

Author(s):

HOLM ALTENBACH ◽

KONSTANTIN NAUMENKO ◽

YEVGEN GORASH

Keyword(s):

Experimental Data ◽

Creep Rate ◽

Stress Relaxation ◽

Constitutive Model ◽

Power Law ◽

Creep Behavior ◽

Minimum Creep Rate ◽

High Stress ◽

Stress Range ◽

Power Law Creep

Many materials exhibit a stress range dependent creep behavior. The power-law creep observed for a certain stress range changes to the viscous type creep if the stress value decreases. Recently published experimental data for advanced heat resistant steels indicates that the high creep exponent (in the range 5-12 for the power-law behavior) may decrease to the low value of approximately 1 within the stress range relevant for engineering structures. The aim of this paper is to confirm the stress range dependence of creep behavior based on the experimental data of stress relaxation. An extended constitutive model for the minimum creep rate is introduced to consider both the linear and the power law creep ranges. To take into account the primary creep behavior a strain hardening function is introduced. The material constants are identified for published experimental data of creep and relaxation tests for a 12% Cr steel bolting material at 500°C. The data for the minimum creep rate are well-defined only for moderate and high stress levels. To reconstruct creep rates for the low stress range the data of the stress relaxation test are applied. The results show a gradual decrease of the creep exponent with the decreasing stress level. Furthermore, they illustrate that the proposed constitutive model well describes the creep rates for a wide stress range.

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Power-law Creep Behavior of Single-phase Metallic Materials: Its Understanding and Unsolved Problems Part 1

Materia Japan ◽

10.2320/materia.49.49 ◽

2010 ◽

Vol 49 (2) ◽

pp. 49-54 ◽

Cited By ~ 2

Author(s):

Hiroshi Oikawa

Keyword(s):

Power Law ◽

Creep Behavior ◽

Single Phase ◽

Metallic Materials ◽

Power Law Creep

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Effect of Pre-Strain on Small Punch Creep Test of 316L Stainless Steel at 373K

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.795.152 ◽

2019 ◽

Vol 795 ◽

pp. 152-158

Author(s):

Kai Shang Li ◽

Jian Peng

Keyword(s):

Stainless Steel ◽

Power Law ◽

Creep Behavior ◽

316L Stainless Steel ◽

Fe Simulation ◽

Creep Model ◽

Small Punch ◽

Uniaxial Creep ◽

Experimental Creep ◽

Power Law Creep

Creep does not only appear at high temperature, but also appears at low temperature for 316L stainless steel that threatens the safety of equipment. In this work, the creep behavior of as-received and pre-strained 316L stainless steel at 373K was investigated by uniaxial creep (UC) tests and small punch creep (SPC) tests. The parameters of power-law creep model were determined from stress dependence of UC tests. Then, the creep behavior of SPC test was analyzed by finite element (FE) simulation combined with power-law creep model. Comparing with experimental creep deflection, the results of FE simulation can reasonably reflect the creep behavior of as-received and pre-strained small punch specimens. Based on the comparison of as-received specimen and pre-strained specimen from UC test, SPC test and FE simulation, pre-strain significantly restrains creep behavior of 316L austenitic steel at 373K.

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