Description of the creep and failure of beams in bending and shafts in torsion by equations with a scalar damage parameter

1999 ◽  
Vol 40 (6) ◽  
pp. 1138-1142 ◽  
Author(s):  
B. V. Gorev ◽  
I. D. Klopotov
Keyword(s):  
Damage Parameter ◽  
Scalar Damage Parameter

scholarly journals Modeling of anisotropic strength using scalar damage parameter

2014 ◽  
Vol 6 (6) ◽  
pp. 937-942
Author(s):  
O. Ya. Izvekov
Keyword(s):  
Damage Parameter ◽  
Anisotropic Strength ◽  
Scalar Damage Parameter

scholarly journals Finite Element Analysis of Influence of Non-homogenous Temperature Field on Designed Lifetime of Spatial Structural Elements under Creep Conditions

2016 ◽  
Vol 1 (1) ◽  
pp. 253-262 ◽  
Author(s):  
S.O. Pyskunov ◽  
Yu.V. Maksimyk ◽  
V.V. Valer
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Fracture Process ◽  
Damage Parameter ◽  
Problem Solution ◽  
Structural Elements ◽  
Element Analysis ◽  
Scalar Damage Parameter

AbstractThe techniques of modeling of continual fracture process for spatial bodies under long-term static force loading condition in non-homogenous temperature field are presented. The scalar damage parameter is used to describe the material continual fracture process. A stress-strain problem solution made with semianalytic finite element method (SFEM). Results of lifetime determination of responsible parts are presented.

Isotropic Damage Analysis of Thermoelastic Problems using BIE

2019 ◽  
Vol 17 (03) ◽  
pp. 1850141 ◽  
Author(s):  
H. Gun
Keyword(s):  
Integration Method ◽  
Rotating Disk ◽  
Damage Parameter ◽  
Boundary Integral ◽  
Damage Analysis ◽  
Integral Equation Formulation ◽  
Isotropic Damage ◽  
Thermoelastic Problems ◽  
Walled Cylinder ◽  
Scalar Damage Parameter

This work presents a quadratic boundary integral equation formulation for isotropic damage analysis of components subjected to mechanical, thermal and centrifugal loads. To evaluate domain-related integrals due to the damage effects, the radial integration method (RIM) based on the use of the approximating the normalized displacements in the domain integrals by a series of prescribed radial basis functions (RBF) is adopted. The density of micro-defects is assumed to be small in the material. The scalar damage parameter expressed in an exponential evolution equation is utilized. Numerical examples including a rectangular plate, thick-walled cylinder and rotating disk problems under the thermal loads are given.

Damage Mechanics and Critical Plane Approach to Multiaxial Fatigue

2013 ◽  
Vol 592-593 ◽  
pp. 239-245
Author(s):  
Roberto Brighenti ◽  
Andrea Carpinteri
Keyword(s):  
Fatigue Life ◽  
Damage Mechanics ◽  
Crack Nucleation ◽  
Fatigue Loading ◽  
Fatigue Behaviour ◽  
Damage Parameter ◽  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Critical Plane Approach ◽  
Scalar Damage Parameter

The mechanical behaviour of structural components subjected to multiaxial fatigue loading is very important in modern design. Several approaches have been introduced in recent decades to analyse this problem. The so-called critical plane approach, based on the stresses acting on the plane where the crack nucleation is expected to occur, is widely used. This criterion can give us a fatigue damage measurement, which can be used to evaluate fatigue life. On the other hand, fatigue life under general multiaxial stress histories can also be assessed by applying the damage accumulation method. In such a method, a scalar damage parameter is quantified through the damage increments which develop during the fatigue process up to the critical damage value corresponding to the final failure of the structures. The damage increment approach to fatigue has recently been discussed and connected to the classical crack propagation approach. In the present paper, the interpretation of the critical plane approach based on the continuum damage mechanics concepts is examined. In particular, the physical meaning of the critical plane approach is shown, that is, such an approach can be interpreted as a damage method which takes into account the scalar damage parameter evaluated along preferential directions. Finally, the fatigue behaviour of a metallic material under multiaxial cyclic load histories is analysed through the two above approaches.

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