Thermal fatigue life estimation and delamination mechanics studies of multilayered MEMS structures

2012 ◽  
Vol 52 (8) ◽  
pp. 1665-1678 ◽  
Author(s):  
A.R. Maligno ◽  
D.C. Whalley ◽  
V.V. Silberschmidt
Keyword(s):  
Fatigue Life ◽  
Thermal Fatigue ◽  
Life Estimation ◽  
Thermal Fatigue Life ◽  
Fatigue Life Estimation

Thermal Fatigue Life Estimation of Lead-Free Solder Using Inelastic Constitutive Model

2002 ◽  
Vol 2002.6 (0) ◽  
pp. 283-284
Author(s):  
Hiroyuki TAKAHASHI ◽  
Takashi KAWAKAMI ◽  
Minoru MUKAI ◽  
Mineo KOBAYASHI ◽  
Nobutada OHNO ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Constitutive Model ◽  
Thermal Fatigue ◽  
Lead Free ◽  
Lead Free Solder ◽  
Life Estimation ◽  
Thermal Fatigue Life ◽  
Fatigue Life Estimation ◽  
Free Solder

A Model for Estimation of Mould Thermal Fatigue Life in Permanent Mould Casting

2008 ◽  
Vol 144 ◽  
pp. 145-150 ◽  
Author(s):  
Ramazan Kayikci ◽  
M. Durat ◽  
E. Nart ◽  
I. Ozsert
Keyword(s):  
Fatigue Life ◽  
Thermal Fatigue ◽  
Cad System ◽  
Thermal Fatigue Life ◽  
Solid Models ◽  
Fatigue Life Estimation ◽  
Steady State Temperature ◽  
Thermal Solution ◽  
3D Solid ◽  
Mould Casting

In this study, using materials thermo-physical data and CAD/CAE techniques the thermal fatigue life of a permanent mould is estimated. 3D solid models of the mould-casting system consisted of a permanent mould made from grade 60 ductile iron and an aluminium 7% Si, 0.3 % Mg Casting alloy (A356) were constructed in a CAD system. After defining all boundary and initials conditions in a finite element environment a thermal solution of the permanent mould casting is achieved repeatedly for every cycle until the steady-state temperature change is reached. The elastic-plastic stress calculation is performed by using the thermal history obtained from the thermal analysis. At the end, the residual stresses are determined and used for the thermal fatigue life estimation. The results showed that using the proposed CAD/CAE techniques the fatigue life of a permanent mould can be estimated.

Load Spectrum Compiling and Fatigue Life Estimation of the Automobile Wheel Hub

2020 ◽  
Vol 13 ◽  
Author(s):  
Xintian Liu ◽  
Yang Qu ◽  
Xiaobing Yang ◽  
Yongfeng Shen
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Two Dimensional ◽  
Load Spectrum ◽  
One Dimensional ◽  
Life Estimation ◽  
Load Spectra ◽  
Fatigue Life Estimation ◽  
Program Load Spectrum ◽  
Program Load

Background:: In the process of high-speed driving, the wheel hub is constantly subjected to the impact load from the ground. Therefore, it is important to estimate the fatigue life of the hub in the design and production process. Objective:: This paper introduces a method to study the fatigue life of car hub based on the road load collected from test site. Methods:: Based on interval analysis, the distribution characteristics of load spectrum are analyzed. The fatigue life estimation of one - dimensional and two - dimensional load spectra is compared by compiling load spectra. Results:: According to the S-N curve cluster and the one-dimensional program load spectrum, the estimated range fatigue life of the hub is 397,100 km to 529,700 km. For unsymmetrical cyclic loading, each level means and amplitude of load were obtained through the Goodman fatigue empirical formula, and then according to S-N curve clusters in the upper and lower curves and two-dimensional program load spectrum, estimates the fatigue life of wheel hub of the interval is 329900 km to 435200 km, than one-dimensional load spectrum fatigue life was reduced by 16.9% - 17.8%. Conclusion:: This paper lays a foundation for the prediction of fatigue life and the bench test of fatigue durability of auto parts subjected to complex and variable random loads. At the same time, the research method can also be used to estimate the fatigue life of other bearing parts or high-speed moving parts and assemblies.

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