scholarly journals Effect of Strain Rate and Temperature on Micro Fatigue Crack Propagation of Bi-Sn Eutectic Alloy

2016 ◽  
Vol 57 (6) ◽  
pp. 853-859 ◽  
Author(s):  
Maiko Taniguchi ◽  
Yoshiharu Kariya
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Strain Rate ◽  
Fatigue Crack Propagation ◽  
Eutectic Alloy

Dynamic Property and Fatigue Crack Propagation Research on Tire Sidewall and Model Compounds

1985 ◽  
Vol 58 (4) ◽  
pp. 785-805 ◽  
Author(s):  
D. G. Young
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Strain Rate ◽  
Fatigue Crack Propagation ◽  
Strain Energy ◽  
Laboratory Data ◽  
Sample Thickness ◽  
Strain Level ◽  
Strain Rate Effects ◽  
Rate Effects

Abstract Research was conducted to define appropriate compound loading conditions and energy parameters required to properly control and analyze fatigue crack propagation experiments for tire sidewall applications. The effects of strain level, pulse frequency, overall cycle frequency, sample thickness, and oven temperature were screened, and strain level was shown to be the dominant variable in the region of interest. Designed experiments further confirmed that frequency (i.e., strain rate) effects upon strain energy are small at normal rates of tire deformation (equivalent to 40 Hz). However, at typical laboratory test frequencies (≤5 Hz), strain rate effects on strain energy are large, and the differences vs. results under tire conditions depend heavily on polymer type as well as test temperature. Thus, the use of strain level, strain rate, and temperature conditions which simulate the tire service environment are critical to give representative results in laboratory testing. A constitutive equation was defined which provides an excellent model for strain energy in pure (or simple) shear as a function of the principal extension ratio (i.e., strain level) at constant frequency. Therefore, computer modeling of such experiments appears straightforward using an on-line minicomputer. Fatigue crack propagation studies showed major effects of pure-shear sample thickness, processing prior to molding, different types of reference compounds, and different polymer types. Halobutyl compounds and halobutyl/EPDM/NR blends were shown to provide superior FCP resistance at a given strain or strain energy level. These results were consistent with earlier tire and laboratory data.

Effect of microstructure on inhibition of fatigue-crack propagation in a directionally solidified ?/?? MeC eutectic alloy

1983 ◽  
Vol 15 (11) ◽  
pp. 1618-1623
Author(s):  
I. L. Svetlov ◽  
N. D. Zhukov ◽  
�. L. Kats ◽  
M. P. Nazarova ◽  
V. V. Gerasimov ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Eutectic Alloy ◽  
Directionally Solidified ◽  
Effect Of Microstructure

Effect of Stress Frequency on Fatigue Crack Propagation in Titanium

1982 ◽  
Vol 104 (4) ◽  
pp. 257-261 ◽  
Author(s):  
S. Takezono ◽  
M. Satoh
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Strain Rate ◽  
Fatigue Crack Propagation ◽  
Strain Range ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Fatigue Crack Propagation Rate ◽  
Rate Dependency ◽  
Strain Rate Dependency

The effect of stress frequency on the fatigue crack propagation rate in 99.5 percent pure titanium, which has a strong strain rate dependency in the plastic region, was studied. Fatigue crack propagation tests were carried out under three stress frequencies (0.02Hz, 0.2Hz, 20Hz). An elasto/visco-plastic analysis of fatigue crack propagation was performed by the finite element method (FEM), and an analysis of the dependency of crack propagation rate on frequency and strain behavior at the crack tip. The results obtained in this study are summarized as follows: (1) It was found from the experiments that the crack propagation rate, dl/dN, was approximately in inverse proportion to fn (n>0), where f is the frequency. (2) A parameter closely related to the fatigue crack growth rate is the strain range, Δεy, or visco-plastic strain range, Δεyνp at the crack tip. (3) The effect of stress frequency on the fatigue crack propagation rate may be explained by variations of Δεy or Δεyνp based on the strain rate dependency of the material.

High Cycle Fatigue and Fatigue Crack Propagation Behaviors of Modified A7075-T73 Alloy

2014 ◽  
Vol 52 (4) ◽  
pp. 283-291 ◽  
Author(s):  
Gwan Yeong Kim ◽  
Kyu Sik Kim ◽  
Joong Cheol Park ◽  
Shae Kwang Kim ◽  
Young Ok Yoon ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Cycle Fatigue ◽  
Cycle Fatigue
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