Inelastic damage as a mechanical precursor for the emplacement of saucer-shaped intrusions

Geology ◽  
2017 ◽  
Vol 45 (12) ◽  
pp. 1099-1102 ◽  
Author(s):  
Øystein Thordén Haug ◽  
Olivier Galland ◽  
Pauline Souloumiac ◽  
Alban Souche ◽  
Frank Guldstrand ◽  
...  
Keyword(s):  
Inelastic Damage

Failure Analysis of Miniature Solder Specimen

2001 ◽  
Author(s):  
Y. Wei ◽  
C. L. Chow ◽  
H. E. Fang ◽  
M. K. Neilsen ◽  
T. J. Lim ◽  
...  
Keyword(s):  
Finite Element ◽  
Uniaxial Tension ◽  
Evolution Equations ◽  
Damage Model ◽  
Irreversible Thermodynamics ◽  
Tensile Creep ◽  
Miniature Specimen ◽  
Damage Theory ◽  
Inelastic Damage ◽  
Strain Space

Abstract The effects of specimen geometry size on the behavior of 63Sn-37Pb solder are investigated both experimentally in the laboratory and analytically with finite-element simulations. The simulations are achieved by developing a constitutive model for solder which couples viscoplasticity with a unified damage theory. The unified damage theory is characterized by a damage surface in strain space which separates fatigue damage from inelastic damage. The damage evolution equations are derived within the framework of irreversible thermodynamics. A series of uniaxial tension, tensile creep, and strain-controlled fatigue experiments are performed to obtain material parameters for the solder damage model. The solder damage model is then implemented into a finite element code and used to simulate a uniaxial tension test on a miniature specimen and on a standard ASTM specimen (ASTM standards, 1999). Predictions from these simulations are then compared with each other and with experimental results in order to examine specimen size effects.

scholarly journals Inelastic damage using continuum damage mechanics in composite plate reinforced by unidirectional fibers

2018 ◽  
Vol 157 ◽  
pp. 01023
Author(s):  
Milan Žmindák ◽  
Martin Dudinský
Keyword(s):  
Composite Structures ◽  
Composite Plate ◽  
Damage Mechanics ◽  
Continuum Damage Mechanics ◽  
Continuum Damage ◽  
Elastic Plastic ◽  
Unidirectional Fibers ◽  
Plastic Damage ◽  
Inelastic Damage ◽  
Matlab Programming

It is well that a finite element method is very popular simulation method to predict the physical behavior of systems and structures. In the last years an increase of interest in a new type of numerical methods known as meshless methods was observed. The paper deals with application of radial basis functions on modelling of inelastic damage using continuum damage mechanics of layered plate composite structures reinforced with long unidirectional fibers. For numerical simulations of elastic-plastic damage of layered composite plates own computational programs were implemented in MATLAB programming language. We will use the Newton-Raphson method to solve nonlinear systems of equations. Evaluation damage during plasticity has been solved using return mapping algorithm. The results of elastic-plastic damage analysis of composite plate with unsymmetrical laminate stacking sequence are presented.

Failure Analysis of Miniature Solder Specimen

2004 ◽  
Vol 126 (1) ◽  
pp. 100-105 ◽  
Author(s):  
Y. Wei ◽  
C. L. Chow ◽  
H. E. Fang ◽  
M. K. Neilsen ◽  
T. J. Lim ◽  
...  
Keyword(s):  
Finite Element ◽  
Uniaxial Tension ◽  
Evolution Equations ◽  
Damage Model ◽  
Irreversible Thermodynamics ◽  
Tensile Creep ◽  
Tension Testing ◽  
Damage Theory ◽  
Inelastic Damage ◽  
Strain Space

The effects of specimen geometry size on the behavior of 63Sn-37Pb solder are investigated both experimentally in the laboratory and analytically with finite-element simulations. The simulations are achieved by developing a constitutive model for solder which couples viscoplasticity with a unified damage theory. The unified damage theory is characterized by a damage surface in strain space which separates fatigue damage from inelastic damage. The damage evolution equations are derived within the framework of irreversible thermodynamics. A series of uniaxial tension, tensile creep, and strain-controlled fatigue experiments are performed to obtain material parameters for the solder damage model. The solder damage model is then implemented into a finite element code and used to simulate a uniaxial tension test on a miniature specimen and on a standard ASTM specimen (ASTM Standards, 1999, “Tension Testing of Metallic Materials,” ASTM E8-78). Predictions from these simulations are then compared with each other and with experimental results in order to examine microstructure size effects.

Effective shock factors for the inelastic damage prediction of clamped plane plates subjected to non-contact underwater explosion

2009 ◽  
Vol 44 (3) ◽  
pp. 211-220 ◽  
Author(s):  
R Rajendran
Keyword(s):  
Damage Assessment ◽  
Underwater Explosion ◽  
Strain Analysis ◽  
Coupling Factor ◽  
Yield Response ◽  
Rectangular Plates ◽  
Current Investigation ◽  
Damage Scenario ◽  
Damage Prediction ◽  
Inelastic Damage

Shock factors are conventionally used to designate the effect of an underwater explosion on a target. The concept of the effective shock factor was introduced by Rajendran and Narasimhan in a paper entitled ‘A shock factor based approach for the damage assessment of plane plates subjected to underwater explosion’, published in the Journal of Strain Analysis in 2006 (volume 41, issue 6, pages 417–425) for predicting the elastic and yield response of circular and rectangular plates; it was revealed that the coupling factor drastically influences the effect of shock factor on the response of plane plates. It will be of immense use to the designer if effective shock factors are introduced for predicting the inelastic damage of target plates, as shock factors notionally present a pessimistic picture about the damage scenario. The current investigation introduces the concept of effective shock factors to the existing prediction methodologies for estimating inelastic damage of plane plates. Water-backed plate is analysed along with air-backed plates to represent the water-filled side shell of a ship.

The Influence of Inelastic Damage on Tensile Deformation and Creep Crack Growth Behaviour of Type 316H Stainless Steel

2013 ◽  
Author(s):  
A. Mehmanparast ◽  
C. M. Davies ◽  
D. W. Dean ◽  
K. M. Nikbin
Keyword(s):  
Stainless Steel ◽  
Plastic Strain ◽  
Crack Growth ◽  
Creep Strain ◽  
Room Temperature ◽  
Creep Crack Growth ◽  
Tensile Behaviour ◽  
Creep Tests ◽  
Creep Crack ◽  
Inelastic Damage

Inelastic deformation (combined plastic and creep strain) is known to have significant effects on the tensile and creep deformation behaviour of Type 316H stainless steel. In this work the influence of inelastic strain on the room temperature tensile behaviour of 316H has been examined. Plastic strain was introduced into the material by uniform pre-compression (PC) to 8% plastic strain at room temperature. In addition, creep strain was subsequently introduced into samples by performing uniaxial creep tests on the pre-compressed material. These creep tests were interrupted at various stages of life so that the influence of inelastic damage on the tensile response of the material could be examined. In addition, creep crack growth (CCG) tests have been performed on compact tension C(T) specimens made of 8% pre-compressed material at 550 °C and the results are compared to the existing data on PC material. The results from these tests have been discussed in terms of specimen constraint, initial crack length and loading effects on the CCG behaviour of the PC material.

Seismic assessment of concrete bridges using inelastic damage analysis

1997 ◽  
Vol 19 (3) ◽  
pp. 208-216 ◽  
Author(s):  
Martin S. Williams ◽  
Robert G. Sexsmith
Keyword(s):  
Seismic Assessment ◽  
Concrete Bridges ◽  
Damage Analysis ◽  
Inelastic Damage
Sign in / Sign up

Export Citation Format

Share Document