THE FATIGUE BEHAVIOR OF FRESHWATER ICE

1987 ◽  
Vol 48 (C1) ◽  
pp. C1-329-C1-335 ◽  
Author(s):  
W. A. NIXON ◽  
R. A. SMITH
Keyword(s):  
Fatigue Behavior ◽  
Freshwater Ice

Calculating Energy Release Rate as a Function of Crack Length Using a Multiple-Step Crack Closure Technique in Tire Finite Element Models

2018 ◽  
Vol 46 (3) ◽  
pp. 130-152
Author(s):  
Dennis S. Kelliher
Keyword(s):  
Finite Element ◽  
Energy Release Rate ◽  
Crack Length ◽  
Energy Release ◽  
Crack Closure ◽  
Release Rate ◽  
Fatigue Behavior ◽  
Three Dimensions ◽  
Quantitative Prediction ◽  
Closure Technique

ABSTRACT When performing predictive durability analyses on tires using finite element methods, it is generally recognized that energy release rate (ERR) is the best measure by which to characterize the fatigue behavior of rubber. By addressing actual cracks in a simulation geometry, ERR provides a more appropriate durability criterion than the strain energy density (SED) of geometries without cracks. If determined as a function of crack length and loading history, and augmented with material crack growth properties, ERR allows for a quantitative prediction of fatigue life. Complications arise, however, from extra steps required to implement the calculation of ERR within the analysis process. This article presents an overview and some details of a method to perform such analyses. The method involves a preprocessing step that automates the creation of a ribbon crack within an axisymmetric-geometry finite element model at a predetermined location. After inflating and expanding to three dimensions to fully load the tire against a surface, full ribbon sections of the crack are then incrementally closed through multiple solution steps, finally achieving complete closure. A postprocessing step is developed to determine ERR as a function of crack length from this enforced crack closure technique. This includes an innovative approach to calculating ERR as the crack length approaches zero.

Fatigue of Unidirectional Cord-Rubber Composites

1999 ◽  
Vol 27 (1) ◽  
pp. 48-57 ◽  
Author(s):  
Y. Liu ◽  
Z. Wan ◽  
Z. Tian ◽  
X. Du ◽  
J. Jiang ◽  
...  
Keyword(s):  
Damage Accumulation ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Constant Load ◽  
Testing System ◽  
Rubber Composites ◽  
Cycle Frequency ◽  
Periodic Loading ◽  
Fatigue Damage Accumulation ◽  
Rubber Composite

Abstract A fatigue testing system is established with which the real-time recording of stress, strain, temperature, and hysteresis loss of rubbers or cord-rubber composite specimens subjected to periodic loading or extension can be successfully carried out. Several problems are connected with the experimental study of the fatigue of rubber composites. In constant extension cycling, the specimen becomes relaxed because of the viscoelasticity of rubber composites, and the imposed tension-tension deformation becomes complex. In this method, the specimen is unlikely to fail unless the imposed extensions are very large. Constant load cycling can avoid the shortcomings of constant extension cycling. The specially designed clamps ensure that the specimen does not slip when the load retains a constant value. The Deformation and fatigue damage accumulation processes of rubber composites under periodic loading are also examined. Obviously, the effect of cycle frequency on the fatigue life of rubber composites can not be ignored because of the viscoelasticity of constituent materials. The increase of specimen surface temperature is relatively small in the case of 1 Hz, but the temperature can easily reach 100°C at the 8 Hz frequency. A method for evaluating the fatigue behavior of tires is proposed.

Fatigue behavior of calcium containing AZ91 magnesium alloys

2015 ◽  
Vol 57 (2) ◽  
pp. 126-130
Author(s):  
Dorothea Amberger ◽  
Tina Blickle ◽  
Heinz Werner Höppel ◽  
Mathias Göken
Keyword(s):  
Magnesium Alloys ◽  
Fatigue Behavior ◽  
Az91 Magnesium

Mechanical properties and fatigue behavior of CO2 laser beam welded armor steel joints

2020 ◽  
Vol 62 (7) ◽  
pp. 689-697
Author(s):  
Zulkuf Balalan ◽  
Furkan Sarsilmaz ◽  
Omer Ekinci
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Co2 Laser ◽  
Fatigue Behavior ◽  
Armor Steel ◽  
Steel Joints

Fatigue behavior of unbonded prestressed reactive powder concrete beams after creep

2020 ◽  
Vol 62 (9) ◽  
pp. 951-956
Author(s):  
Luo Xuguo ◽  
Tan Zheng Long ◽  
Y. Frank Chen
Keyword(s):  
Concrete Beams ◽  
Fatigue Behavior ◽  
Reactive Powder Concrete ◽  
Reactive Powder

Subtask 12D6: Fatigue behavior of unirradiated V-5Cr-5Ti

1995 ◽  
Author(s):  
B G Gieseke ◽  
C O Stevens ◽  
M L Grossbeck
Keyword(s):  
Fatigue Behavior
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