An Improved Multiaxial Creep-Rupture Strength Criterion

1985 ◽  
Vol 107 (4) ◽  
pp. 421-429 ◽  
Author(s):  
R. L. Huddleston
Keyword(s):  
Rupture Strength ◽  
Strength Criterion ◽  
Creep Rupture ◽  
304 Stainless Steel ◽  
New Model ◽  
Biaxial Creep ◽  
Stress States ◽  
Multiaxial Creep ◽  
Von Mises ◽  
Type 304

An improved strength model is developed for predicting creep rupture under multiaxial stress states. The new model incorporates three independent stress parameters and distinguishes between life under tensile versus compressive stress states. Assessments of the new model based on experimental biaxial creep-rupture data for type 304 stainless steel tested at 593°C show the new model to be significantly more accurate than the classical criteria of von Mises, Tresca, or Rankine.

Experimental Study of Biaxial Creep Damage for Type 304 Stainless Steel

2002 ◽  
Vol 11 (3) ◽  
pp. 247-262 ◽  
Author(s):  
Masao Sakane ◽  
Hiroto Tokura
Keyword(s):  
Stainless Steel ◽  
Biaxial Tension ◽  
Crack Opening ◽  
Equivalent Stress ◽  
Creep Damage ◽  
304 Stainless Steel ◽  
Creep Tests ◽  
Biaxial Creep ◽  
Type 304 ◽  
Type 304 Stainless Steel

This paper studies the biaxial creep damage of type 304 stainless steel at 923 K. Biaxial tension creep tests were carried out using cruciform specimens and the effect of stress biaxiality on rupture lifetime and creep voiding was discussed. Mises equivalent stress and the equivalent stress based on crack opening displacement were a suitable parameter to assess the biaxial creep damage. The equivalent stress proposed by Huddleston overestimated the biaxial creep damage by more than a factor of two. Stress biaxiality had almost no influence on the orientation of voided grain boundaries and the critical value ofparameter A. Tests of alternative loading direction significantly dispersed the biaxial creep damage resulting in larger creep lifetime.

Simplified Estimation of Creep-Rupture Strength for Notched Tensile Specimens of Austenitic Stainless Steels

1988 ◽  
Vol 110 (3) ◽  
pp. 314-321 ◽  
Author(s):  
H. J. Konish
Keyword(s):  
Rupture Strength ◽  
Equivalent Stress ◽  
Stress Triaxiality ◽  
Austenitic Stainless Steels ◽  
Peak Stress ◽  
Creep Rupture ◽  
Creep Rupture Strength ◽  
Apparent Contradiction ◽  
Notched Specimen ◽  
Von Mises

A method for characterizing the creep-rupture strength of notched tensile specimens subjected to constant membrane loading has been developed. This method resolves the apparent contradiction between notch-strengthening and notch-weakening by employing the average von Mises equivalent stress on the net section of a notched specimen as its true rupture strength. The nominal net section equivalent stress can be determined by elastic analysis. Seven different notched specimen geometries of 304 and 316 stainless steel, assessed by this approach, exhibit varying degrees of notch-weakening at test temperatures from 1000°F (538°C) to 1500°F (816°C). The extent of notch-weakening is slightly dependent on specimen material and test temperature but the principal factor appears to be the degree to which the notch constrains inelastic flow on the net section. The effects of notch constraint on notch-weakening are well characterized by the peak stress triaxiality factor.

The Influence of Nitrogen and Certain Other Elements on the Creep-Rupture Properties of Wholly Austenitic Type 304 Steel

1967 ◽  
Vol 89 (3) ◽  
pp. 517-524 ◽  
Author(s):  
P. D. Goodell ◽  
T. M. Cullen ◽  
J. W. Freeman
Keyword(s):  
Rupture Strength ◽  
Heat Treating ◽  
Creep Rupture ◽  
Published Data ◽  
Strengthening Effect ◽  
Full Effect ◽  
Titanium Aluminum ◽  
Rupture Properties ◽  
Type 304 ◽  
Percent Manganese

Experimental heats of Type 304 steel, compositionally balanced to be wholly austenitic and thus simulate the material used to produce seamless superheater tubing, were prepared to determine the influence of selected elements on the creep-rupture properties of this steel and thereby assess their possible contribution to the improvement in the elevated temperature properties which has been noted over the past years. Nitrogen is shown to increase the rupture strength at 1200 deg F of the wholly austenitic laboratory heats to a pronounced extent. Furthermore, almost the full effect of nitrogen was obtained after heat-treating at temperatures as low as 1750 deg F. Rupture strengths also increased with increasing carbon content although heat-treatment above 1750 deg F was necessary to obtain the maximum strengthening effect from the higher levels of this element. Nitrogen was a somewhat more effective strengthener than carbon, the rupture strengths correlating with (%C) + 1.25 × (%N). Small amounts of titanium, aluminum, boron, copper, and molybdenum had no or at most only minor effects on the properties. More than 0.1 percent manganese was necessary for good rupture properties but otherwise had little effect at levels up to at least 1.5 percent. Published data for commercial heats fitted the correlation developed from the laboratory heats. The generally higher level of the rupture strength data for Type 304 austenitic steel published since the early 1950’s appears to be closely related to higher levels of nitrogen. The data indicate that it is extremely important to control nitrogen content to obtain expected creep-rupture properties at 1200 deg F.

Creep Void Formation and Rupture Lifetime in Multiaxial Stress States

2019 ◽  
Vol 795 ◽  
pp. 159-164
Author(s):  
Masao Sakane ◽  
Hiroki Kobayashi ◽  
Ryohei Ohki ◽  
Takamoto Itoh
Keyword(s):  
Equivalent Stress ◽  
Void Formation ◽  
Creep Rupture ◽  
Triaxial Stress ◽  
Multiaxial Stress ◽  
Creep Tests ◽  
Triaxial Creep ◽  
Stress States ◽  
Von Mises Equivalent Stress ◽  
Von Mises

This paper discusses creep void formation and rupture lifetimes in multiaxial stress states for a SUS 304 stainless steel at elevated temperatures. Biaxial and triaxial tension creep tests were performed using a cruciform and a cubic specimen, respectively. These two types of the specimens were designed to achieve uniform equi-biaxial and equi-triaxial stress distributions by a finite element analysis in the gage parts. Void formation at grain boundaries was observed by intermitting biaxial creep tests and by interrupting triaxial creep tests. Creep rupture lifetimes were also obtained in biaxial and triaxial creep tests. Biaxial stresses increase the void formation but give a little influence on a creep rupture lifetime in the correlation with von Mises equivalent stress. Triaxial stresses also increase the void formation and drastically reduce a creep rupture lifetime in the correlation with von Mises equivalent stress. Evident void formation in an equi-triaxial stress condition demonstrates that von Mises equivalent stress is not a suitable measure to evaluate creep damage development in multiaxial stress states. A new equivalent stress is proposed to evaluate creep rupture lifetimes in biaxial and triaxial stress states.

Influence of carbide on intergranular creep rupture of type 304 stainless steel

1998 ◽  
Vol 14 (12) ◽  
pp. 1249-1256 ◽  
Author(s):  
J. He ◽  
G. Han ◽  
S. Fukuyama ◽  
K. Yokogawa
Keyword(s):  
Stainless Steel ◽  
Creep Rupture ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel

scholarly journals Creep Rupture Properties and Creep Fracture Mechanism Maps for Type 304 Stainless Steel

1983 ◽  
Vol 69 (14) ◽  
pp. 1668-1675 ◽  
Author(s):  
Norio SHINYA ◽  
Junro KYONO ◽  
Hideo TANAKA ◽  
Masaharu MURATA ◽  
Shin YOKOI
Keyword(s):  
Stainless Steel ◽  
Fracture Mechanism ◽  
Creep Rupture ◽  
304 Stainless Steel ◽  
Creep Fracture ◽  
Rupture Properties ◽  
Type 304 ◽  
Type 304 Stainless Steel
Sign in / Sign up

Export Citation Format

Share Document