On the effective stress dependence of the steady-state creep rate in SnPb eutectic

This paper deals with the statistical properties of short time creep rupture characteristic values (for example, creep rupture time, steady state creep rate, total creep rate, initial strain, etc.) in STS304 stainless steels. From short time creep rupture tests performed by constant stresses at three different elevated temperatures 600, 650 and 700, the scatter and probability distributions were investigated for rupture time, total creep rate, steady state creep rate, initial strain, and others. The effect of temperature on the statistical scatter of rupture time was the smallest at 700. The effect of stress on the statistical scatter of rupture time was smaller with increasing stresses. The probability distributions of short time creep rupture data were well followed 2-parameter Weibull.

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On Creep Rupture Characteristics in STS304 Stainless Steels

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.1309 ◽

2006 ◽

Vol 326-328 ◽

pp. 1309-1312

Author(s):

Seon Jin Kim ◽

Yu Sik Kong ◽

Young Join Noh ◽

Won Taek Jung ◽

Sang Woo Kwon

Keyword(s):

Steady State ◽

Creep Rate ◽

Stress Exponent ◽

Stainless Steels ◽

Elevated Temperatures ◽

Creep Rupture ◽

Steady State Creep ◽

Rupture Time ◽

Steady State Creep Rate ◽

Creep Stress

In this study, the creep rupture tests of STS304 stainless steels were investigated at three different elevated temperatures of 600, 650 and 700 under the constant creep stresses. Creep rupture characteristics such as creep stress, creep rupture time, steady state creep rate and so on were evaluated. The behaviors of creep rate curve and initial strain are compared at three different elevated temperatures. The stress exponent (n) at 600, 650 and 700 based on steady state creep rate showed 22.5, 20.6 and 11.4 respectively. By increasing the temperature, the stress exponent is decreased. At the temperature of 700, the lowest stress exponents are shown and this behavior is also observed in the case of stress exponent based on rupture time. The creep life prediction by LMP method is presented and the equation of this result is as follows: T(logtr+20)=-0.005152-14.56+24126.

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Coupled modeling of steady-state creep rate and creep rupture strength for metals

Strength of Materials ◽

10.1007/s11223-008-9050-y ◽

2008 ◽

Vol 40 (4) ◽

pp. 411-418

Author(s):

N. A. Veklich ◽

A. M. Lokoshchenko ◽

P. N. Veklich

Keyword(s):

Steady State ◽

Creep Rate ◽

Rupture Strength ◽

Creep Rupture ◽

Steady State Creep ◽

Creep Rupture Strength ◽

Steady State Creep Rate ◽

Coupled Modeling

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A Parametric Approach to Cyclic Creep

Journal of Applied Mechanics ◽

10.1115/1.3423789 ◽

1976 ◽

Vol 43 (1) ◽

pp. 28-32

Author(s):

V. M. Radhakrishnan

Keyword(s):

Steady State ◽

Creep Rate ◽

Maximum Stress ◽

Pure Aluminum ◽

Cyclic Creep ◽

Steady State Creep ◽

Strain Accumulation ◽

Parametric Approach ◽

Steady State Creep Rate ◽

Reference Stress

Investigations have been carried out to study the effect of oscillating stress on the strain accumulation in pure aluminum at elevated temperature. The creep rate under the oscillating stress has been found to increase with increasing value of the alternating component of the stress and is somewhat higher than the steady-state creep rate corresponding to the maximum stress, in the range of temperature used. The rupture time is inversely proportional to the cyclic creep rate. A model for obtaining the reference stress has been proposed and based on the data obtained, a parametric approach is presented.

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