scholarly journals Fatigue. Fatigue Properties of Shot-Peened Ti-6Al-4V Alloy at Elevated Temperatures.

1997 ◽  
Vol 46 (10) ◽  
pp. 1136-1142 ◽  
Author(s):  
Yozo KATO ◽  
Shinzaburo TAKAFUJI
Keyword(s):  
Elevated Temperatures ◽  
Fatigue Properties

Isothermal Fatigue Behavior and Damage Modeling of a High Temperature Woven PMC

1999 ◽  
Vol 122 (1) ◽  
pp. 62-68 ◽  
Author(s):  
A. L. Gyekenyesi
Keyword(s):  
Compressive Strength ◽  
Elevated Temperature ◽  
Elevated Temperatures ◽  
Fatigue Behavior ◽  
Stiffness Degradation ◽  
Fatigue Properties ◽  
Residual Compressive Strength ◽  
Stiffness Reduction ◽  
Fatigue Damage Accumulation ◽  
Strength Tests

This study focuses on the fully reversed fatigue behavior exhibited by a carbon fiber/polyimide resin woven laminate at room and elevated temperatures. Nondestructive video edge view microscopy and destructive sectioning techniques were used to study the microscopic damage mechanisms that evolved. The elastic stiffness was monitored and recorded throughout the fatigue life of the coupon. In addition, residual compressive strength tests were conducted on fatigue coupons with various degrees of damage as quantified by stiffness reduction. Experimental results indicated that the monotonic tensile properties were only minimally influenced by temperature, while the monotonic compressive and fully reversed fatigue properties displayed greater reductions due to the elevated temperature. The stiffness degradation, as a function of cycles, consisted of three stages; a short-lived high degradation period, a constant degradation rate segment covering the majority of the life, and a final stage demonstrating an increasing rate of degradation up to failure. Concerning the residual compressive strength tests at room and elevated temperatures, the elevated temperature coupons appeared much more sensitive to damage. At elevated temperatures, coupons experienced a much larger loss in compressive strength when compared to room temperature coupons with equivalent damage. The fatigue damage accumulation law proposed for the model incorporates a scalar representation for damage, but admits a multiaxial, anisotropic evolutionary law. The model predicts the current damage (as quantified by residual stiffness) and remnant life of a composite that has undergone a known load at temperature. The damage/life model is dependent on the applied multiaxial stress state as well as temperature. Comparisons between the model and data showed good predictive capabilities concerning stiffness degradation and cycles to failure. [S0742-4795(00)01001-2]

scholarly journals Monotonic and Fatigue Properties of Steel Material Manufactured by Wire Arc Additive Manufacturing

2020 ◽  
Vol 10 (15) ◽  
pp. 5238 ◽  
Author(s):  
Michael Wächter ◽  
Marcel Leicher ◽  
Moritz Hupka ◽  
Chris Leistner ◽  
Lukas Masendorf ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Material Properties ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Fatigue Properties ◽  
Practical Applications ◽  
Steel Material ◽  
Characteristic Values ◽  
The One ◽  
Wire Arc Additive Manufacturing

In this study, the monotonic and cyclic material properties of steel material of medium static strength produced additively in the wire arc additive manufacturing (WAAM) process were investigated. This investigated material is expected to be particularly applicable to the field of mechanical engineering, for which practical applications of the WAAM process are still pending and for which hardly any characteristic values can be found in the literature so far. The focus of the investigation was, on the one hand, to determine how the material characteristics are influenced by the load direction in relation to the layered structure and, on the other hand, how they are affected by different interlayer temperatures. For this purpose, monotonic tensile tests were carried out at room temperature as well as at elevated temperatures, and the cyclic material properties were determined. In addition, the hardness of the material and the residual stresses induced during production were measured and compared. In addition to the provision of characteristic properties for the investigated material, it was aimed to determine the extent to which the interlayer temperature influences the strength characteristics, since this can have a considerable influence on the production times and, thus, the economic efficiency of the process.

Fatigue properties of Ni base super alloy at elevated temperatures in long life region

2004 ◽  
Vol 2004 (0) ◽  
pp. 135-136
Author(s):  
Norio Kawagoishi ◽  
Nu Yan ◽  
Qiang Chen ◽  
Hironobu Nisitani ◽  
Yoshihisa Ohzono
Keyword(s):  
Elevated Temperatures ◽  
Fatigue Properties ◽  
Long Life ◽  
Super Alloy
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