Research on Creep Fracture Mechanics Parameter by Reference Stress Method

2011 ◽  
Vol 189-193 ◽  
pp. 4383-4386
Author(s):  
Zhao Ji Hu ◽  
Ting Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fracture Mechanics ◽  
Creep Crack Growth ◽  
Element Analysis ◽  
Creep Fracture ◽  
Creep Crack ◽  
Creep Coefficient ◽  
Reference Stress ◽  
Power Law Creep

Creep fracture mechanics parameter C* is used to relate the data of Creep crack initiation (CCI) and Creep crack growth (CCG). Reference stress method (RSM) can be used to explain the result of finite element analysis on evaluating structures, and it is widely used to design and assess of general structures. The result of C* is affected by the creep coefficient A and creep exponent n for power-law creep in solving creep fracture mechanics parameter C* though using RSM.

Development of the Next-Generation Computational Fracture Mechanics Simulator on the Earth Simulator 2

2012 ◽  
Author(s):  
Kaworu Yodo ◽  
Hiroshi Kawai ◽  
Hiroshi Okada ◽  
Masao Ogino ◽  
Ryuji Shioya
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Large Scale ◽  
Three Dimensional ◽  
Intensity Factors ◽  
Element Analysis ◽  
Mechanics Analysis ◽  
Analysis System

Fracture mechanics analysis using the finite element method has been one of the key methodologies to evaluate structural integrity for aging infrastructures such as aircraft, ship, power plants, etc. However, three-dimensional crack analyses for structures with highly complex three-dimensional shapes have not widely been used, because of many technical difficulties such as the lack of enough computational power. The authors have been developing a fracture mechanics analysis system that can deal with arbitrary shaped cracks in three-dimensional structures. The system consists of mesh generation software, a finite element analysis program and a fracture mechanics module. In our system, a Virtual Crack Closure-Integral Method (VCCM) for the quadratic tetrahedral finite elements is adopted to evaluate the stress intensity factors. This system can perform the three-dimensional fracture analyses. Fatigue and SCC crack propagation analyses with more than one cracks of arbitrary complicated shapes and orientations. The rate and direction of crack propagation are predicted by using appropriate formulae based on the stress intensity factors. When the fracture mechanics analysis system is applied to the complex shaped aging structures with the cracks which are modeled explicitly, the size of finite element analysis tends to be very large. Therefore, a large scale parallel structural analysis code is required. We also have been developing an open-source CAE system, ADVENTURE. It is based on the hierarchical domain decomposition method (HDDM) with the balancing domain decomposition (BDD) pre-conditioner. A general-purpose parallel structural analysis solver, ADVENTURE_Solid is one of the solver modules of the ADVENTURE system. In this paper, we combined VCCM for the tetrahedral finite element with ADVENTURE system and large-scale fracture analyses are fully automated. They are performed using the massively parallel super computer ES2 (Earth Simulator 2) which is owned and run by JAMSTEC (Japan Agency for Marine-Earth Science and Technology).

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