A Practical Approach for Evaluation of Thermal Shock SIF's in Flexibly Restrained Edge-Cracked Plates

2008 ◽  
Vol 41-42 ◽  
pp. 157-167
Author(s):  
B.P. Fillery ◽  
Xiao Zhi Hu ◽  
Gordon Fisher
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Mechanic ◽  
Thermal Shock ◽  
Deformation Theory ◽  
Practical Method ◽  
Element Analysis ◽  
Cracked Plate ◽  
Cracked Plates ◽  
Explicit Analysis

A practical method to evaluate the thermal shock stress intensity factors (TS-SIF`s) associated with a flexibly restrained edge-cracked plate (FRECP) is outlined. It is assumed that the edge crack can be represented with a spring couple, and the deformations of the edge-cracked plate are consistent with Euler-Bernoulli deformation theory. It is then demonstrated how a compliance analysis of this simplified representation can be used with a finite element analysis of equivalent crack free plates to evaluate to TS-SIF`s associated with a FRECP. The accuracy of this method is shown to be excellent by comparing it against a direct fracture mechanic finite element analysis. This method is therefore advantageous to a fracture mechanic finite element analysis as it does not require an explicit analysis of a FRECP.

Plastic Deformation Theory Application in Finite Element Analysis

2012 ◽  
Vol 594-597 ◽  
pp. 2723-2726
Author(s):  
Wen Shan Lin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Deformation Theory ◽  
Three Dimensional ◽  
Constitutive Laws ◽  
Constitutive Law ◽  
Element Analysis ◽  
Finite Element Program ◽  
Theory Of Plasticity ◽  
Element Program

In the present study, the constitutive law of the deformation theory of plasticity has been derived. And that develop the two-dimensional and three-dimensional finite element program. The results of finite element and analytic of plasticity are compared to verify the derived the constitutive law of the deformation theory and the FEM program. At plastic stage, the constitutive laws of the deformation theory can be expressed as the linear elastic constitutive laws. But, it must be modified by iteration of the secant modulus and the effective Poisson’s ratio. Make it easier to develop finite element program. Finite element solution and analytic solution of plasticity theory comparison show the answers are the same. It shows the derivation of the constitutive law of the deformation theory of plasticity and finite element analysis program is the accuracy.

scholarly journals Mid Frequency Shock Response Determination by Using Energy Flow Method and Time Domain Correction

2013 ◽  
Vol 20 (5) ◽  
pp. 847-861 ◽  
Author(s):  
Sung-Hyun Woo ◽  
Jae-Hung Han
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Time Domain ◽  
Energy Flow ◽  
Practical Method ◽  
Frequency Range ◽  
Element Analysis ◽  
Flow Method ◽  
Force Signal ◽  
Structural Parts

Shock induced vibration can be more crucial in the mid frequency range where the dynamic couplings with structural parts and components play important roles. To estimate the behavior of structures in this frequency range where conventional analytical schemes, such as statistical energy analysis (SEA) and finite element analysis (FEA) methods may become inaccurate, many alternative methodologies have been tried up to date. This study presents an effective and practical method to accurately predict transient responses in the mid frequency range without having to resort to the large computational efforts. Specifically, the present study employs the more realistic frequency response functions (FRFs) from the energy flow method (EFM) which is a hybrid method combining the pseudo SEA equation (or SEA-Like equation) and modal information obtained by the finite element analysis (FEA). Furthermore, to obtain the time responses synthesized with modal characteristics, a time domain correction is practiced with the input force signal and the reference FRF on a position of the response subsystem. A numerical simulation is performed for a simple five plate model to show its suitability and effectiveness over the standard analytical schemes.

Finite element analysis of thermal shock tests of RF connectors

2005 ◽  
Vol 168 (2) ◽  
pp. 291-295 ◽  
Author(s):  
Z.Y. Zhu ◽  
H.P. Lee ◽  
B.T. Cheok
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Shock ◽  
Element Analysis

Limit Load Solutions for Surface Cracks in Plates Under Different Loading Types

2002 ◽  
Author(s):  
Peter Dillstro¨m ◽  
Iradj Sattari-Far
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Crack Length ◽  
Crack Depth ◽  
Limit Load ◽  
Surface Cracks ◽  
Pure Bending ◽  
Element Analysis ◽  
Linear Finite Element ◽  
Cracked Plates

Limit load solutions of plates containing surface cracks are determined using non-linear finite element analysis. The study covers both shallow and deep cracks with different crack length/crack depth ratios under different loading types. The crack configurations consist of semi-elliptical surface cracks with a/t = 0.20, 0.40, 0.60, 0.80 and l/a = 2, 5, 10. Also studied are plates containing infinite surface cracks with a/t = 0.00, 0.20, 0.40, 0.60, 0.80. The cracked plates are subjected to pure tension, pure bending and combined tension and bending. The finite element results obtained from this study are compared with some published limit load solutions in the literature. It is shown that the exiting solutions are in general overly conservative.

Coupled Thermomechanical Analyses for Thermal Shock of Ceramic/Metal Gradient Thermal Barrier Coatings

2008 ◽  
Vol 368-372 ◽  
pp. 1341-1343
Author(s):  
Jin Sheng Xiao ◽  
Yong Hua Cai ◽  
Zai Li Zhao
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Shock ◽  
Thermal Barrier Coatings ◽  
Shock Intensity ◽  
Thermal Stresses ◽  
Thermal Barrier ◽  
Element Analysis ◽  
Barrier Coatings

A coupled and uncoupled non-linear thermomechanical finite element analysis using ANSYS have been carried out to analyze the heat transfer and associated thermal stresses during different simulated thermal shock processes, and the results of two analyses are discussed. It indicates that piezocaloric effect can be neglect when thermal shock intensity is mild and piezocaloric effect should be taken into account when thermal shock intensity is severe.

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