Influence of Core on Face/Core Debond Toughness

2000 ◽  
Author(s):  
Gilmer M. Viana Camps ◽  
Leif A. Carlsson ◽  
Xiaoming Li
Keyword(s):  
Fracture Toughness ◽  
Plastic Zone ◽  
Fracture Resistance ◽  
Plastic Zone Size ◽  
Foam Core ◽  
Zone Size ◽  
Anisotropic Behavior ◽  
Mode Mixity ◽  
The Core ◽  
The Difference

Abstract The influence of mechanical properties and fracture toughness of the core on debond fracture toughness of foam core sandwich has been examined. It was found that the fracture toughness for debonding was larger than the core toughness. The observed difference between core fracture toughness and face/core debonding toughness was analyzed using plastic zone size and mode mixity arguments. The difference in toughness can not be explained by plastic zone size and mode mixity effects. It is possible that the core displays a gradient in properties and fracture resistance, and anisotropic behavior which might explain the difference in toughness.

X-ray Fractographic Study on TiAl Alloys with Various Types of Microstructures

1994 ◽  
Vol 38 ◽  
pp. 427-434
Author(s):  
Hiroyuki Tabata ◽  
Zenjiro Yajima ◽  
Yukio Hirose
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Plastic Zone ◽  
Plastic Zone Size ◽  
Fracture Toughness Test ◽  
Zone Size ◽  
Two Phase ◽  
Tial Alloys ◽  
X Ray ◽  
Fracture Surfaces

Abstract The fracture toughness test was conducted on γ + α2 two-phase TiAl alloys with lamellar, duplex and near-y structures. The x-ray fractographic technique was applied to the fracture, surfaces. The plastic zone size my was determined on the basis of the distributions of the residual stress and the half-value breadth beneath the fracture surfaces. Although the fracture mode shows microstructure dependence, ωγ is related to the fracture toughness value KIC and the yield stress σY as: ωy=α(KIC/σY) where α is 0.13.

Fracture toughness, critical crack length and plastic zone size in bone

1978 ◽  
Vol 11 (8-9) ◽  
pp. 359-364 ◽  
Author(s):  
Diane Margel Robertson ◽  
David Robertson ◽  
Craig R Barrett
Keyword(s):  
Fracture Toughness ◽  
Plastic Zone ◽  
Crack Length ◽  
Plastic Zone Size ◽  
Zone Size ◽  
Critical Crack ◽  
Critical Crack Length

On notch fracture mechanics

2021 ◽  
Vol 87 (2) ◽  
pp. 56-64
Author(s):  
G. Pluvinage
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Plastic Zone ◽  
Fracture Resistance ◽  
Notch Radius ◽  
Notch Stress Intensity Factor ◽  
Blunt Notch ◽  
Notch Stress

Different stress distributions for an elastic behavior are presented as analytical expressions for an ideal crack, a sharp notch and a blunt notch. The elastic plastic distribution at a blunt notch tip is analyzed. The concept of the notch stress intensity factor is deduced from the definition of the effective stress and the effective distance. The impacts of the notch radius and constraint on the critical notch stress intensity factor are presented. The paper ends with the presentation of the crack driving force Jρ for a notch in the elastic case and the impact of the notch radius on the notch fracture toughness Jρ,c. The notch fracture toughness Jρ,c is a measure of the fracture resistance which increases linearly with the notch radius due to the plastic work in the notch plastic zone. If this notch plastic zone does not invade totally the ligament, the notch fracture toughness Jρ,c is constant. This occurs when the notch radius is less than a critical one and there is no need to use the cracked specimen to measure a lower bound of the fracture resistance.

A Study on the Cyclic Plastic Zone Size Method, ω*, for Digital Fatigue Life Prediction of Arc-Welded Joints

2003 ◽  
Author(s):  
Tomohiro Hirata ◽  
Toshiaki Nakamaru ◽  
Keisuke Toyama ◽  
Shuichi Magara ◽  
Hiroshi Watanabe ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Plastic Zone ◽  
Welded Joints ◽  
Life Prediction ◽  
Plastic Zone Size ◽  
Fatigue Life Prediction ◽  
Zone Size ◽  
Cyclic Plastic ◽  
Cyclic Plastic Zone
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