Intercrystalline and Transcrystalline Vibration Fatigue Failure in the Inconel 718 Nickel-Based AlloyInter- und transkristalliner Schwingbruch in der Nickel-basis-Legierung Inconel 718

2015 ◽  
pp. 33-46
Author(s):  
H. Wanzek ◽  
A. Fruhner ◽  
J. Fritsche
Keyword(s):  
Fatigue Failure ◽  
Inconel 718 ◽  
Vibration Fatigue

Bending fatigue of single-wall and double-wall corrugated paperboards under sinusoidal and random loads

2021 ◽  
pp. 109963622110204
Author(s):  
Zhi-Wei Wang ◽  
Yang-Zhou Lai ◽  
Li-Jun Wang
Keyword(s):  
Energy Dissipation ◽  
Fatigue Failure ◽  
Fatigue Tests ◽  
Stiffness Degradation ◽  
Random Load ◽  
Bending Fatigue ◽  
Random Loads ◽  
Vibration Fatigue ◽  
Sinusoidal Load ◽  
Double Wall

The bending fatigue tests of single-wall and double-wall corrugated paperboards were conducted to obtain the εrms– N curves under sinusoidal and random loads in this paper. The εrms– N equation of corrugated paperboard can be described by modified Coffin–Manson model considering the effect of mean stress. Four independent fatigue parameters are obtained for single-wall and double-wall corrugated paperboards. The εrms– N curve under random load moves left and rotates clockwise compared with that under sinusoidal load. The fatigue life under random load is much less than that under sinusoidal load, and the fatigue design of corrugated box should be based on the fatigue result under random load. The stiffness degradation and energy dissipation of double-wall corrugated paperboard before approaching fatigue failure are very different from that of single-wall one. For double-wall corrugated paperboard, two turning points occur in the stiffness degradation, and fluctuation occurs in the energy dissipation. Different from metal materials, the bending fatigue failure of corrugated paperboard is a process of wrinkle forming, spreading, and folding. The results obtained have practical values for the design of vibration fatigue of corrugated box.

Vibration Fatigue Analysis for the Frame of Vehicle Equipment

2014 ◽  
Vol 494-495 ◽  
pp. 142-145
Author(s):  
Chao Yang ◽  
Shou Ne Xiao ◽  
Tao Zhu
Keyword(s):  
Fatigue Failure ◽  
Time Domain ◽  
Intrinsic Property ◽  
Fatigue Analysis ◽  
Experimental Result ◽  
Frequency Domain Method ◽  
Time Domain Simulation ◽  
Simulation Approach ◽  
Vibration Fatigue ◽  
The Time Domain

Traditional fatigue analysis approaches could not solve the structure fatigue failure caused by resonances. The time domain simulation approach which took the structural intrinsic property into account was presented to solve vibration fatigue problems. The vibration fatigue failure of the frame of vehicle equipment was studied. Broadband vibration loads were put into the finite element model of the frame as excitations, the stress power spectral density of a dangerous point was calculated. At last, the Dirlik method and the time domain simulation approach were used to calculate the fatigue life. The results show that the damage caused by the first-order vertical flexural vibration is the largest; the result of the time domain simulation approach has a good agreement with the experimental result when compared with the frequency domain method.

scholarly journals Influence of material damage during the forming process on the vibration fatigue behaviour of a clinched connection.

2018 ◽  
Vol 190 ◽  
pp. 12002
Author(s):  
Bernd Maier ◽  
Markus Klingler ◽  
Sabine Böhm ◽  
Birgit Awiszus
Keyword(s):  
Fatigue Failure ◽  
Fatigue Behaviour ◽  
Material Damage ◽  
Forming Process ◽  
Failure Behaviour ◽  
Fe Simulations ◽  
Vibration Fatigue ◽  
Joining Process

This paper presents the results of an analysation of forming damage during the joining process on the fatigue failure behaviour of a clinched connection. The two joining partners out of aluminium, AlMg0.7Si on the punch side and AlMg3 on the die side, are clinched with a flat clinching system and the use of a preformed hole at the die side. By the use of two different geometry variants it could be shown, in fatigue Wöhler tests, that the fatigue failure behaviour is influenced by the material damage in the deformed material of the clinch. The material damage during the clinching process could be calculated with the help of FE-Simulations. So it was possible to show that more forming damage during the joining process causes less lifetime of the connection.

Fatigue Life Analysis of Compressor Bracket of Car Air Conditioner

2014 ◽  
Vol 505-506 ◽  
pp. 319-322
Author(s):  
Wen Shan Wang ◽  
Hua Jie Wu ◽  
Zai Xiang Zheng ◽  
Jing Xu
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Fatigue Failure ◽  
Vibration Test ◽  
Air Conditioner ◽  
Displacement Distribution ◽  
Vibration Fatigue ◽  
Life Analysis ◽  
Simulation Results ◽  
Fatigue Life Analysis

the compressor bracket of car air conditioner frequently breaks and fatigue failure of its welding beam frequently occur in the vibration fatigue test. In order to solve these problems, the static stress and displacement distribution of mounting bracket are given under the effect of different acceleration by using FEM software in the paper. Simulation results show that revised design of the mounting bracket achieves success and its stiffness, strength and fatigue life satisfy the requirements of vibration test.

The Nature of Delta Phase Precipitation in Inconel 718

1982 ◽  
Vol 40 ◽  
pp. 724-725
Author(s):  
L. S. Lin ◽  
C. C. Law
Keyword(s):  
Inconel 718 ◽  
Base Alloy ◽  
High Strength ◽  
Physical Metallurgy ◽  
Nickel Base Alloy ◽  
Phase Precipitation ◽  
Weight Percentage ◽  
Delta Phase ◽  
The Subject ◽  
Nickel Base

Inconel 718, a precipitation hardenable nickel-base alloy, is a versatile high strength, weldable wrought alloy that is used in the gas turbine industry for components operated at temperatures up to about 1300°F. The nominal chemical composition is 0.6A1-0.9Ti-19.OCr-18.0Fe-3Mo-5.2(Cb + Ta)- 0.1C with the balance Ni (in weight percentage). The physical metallurgy of IN 718 has been the subject of a number of investigations and it is now established that hardening is due, primarily, to the formation of metastable, disc-shaped γ" an ordered body-centered tetragonal structure (DO2 2 type superlattice).

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