Thickness Effect and Fatigue Crack Development in Welded T-Joints

1990 ◽  
Vol 112 (4) ◽  
pp. 341-351 ◽  
Author(s):  
R. Yee ◽  
D. J. Burns ◽  
U. H. Mohaupt ◽  
R. Bell ◽  
O. Vosikovsky
Keyword(s):  
Fatigue Crack ◽  
Crack Depth ◽  
Plate Thickness ◽  
Potential Drop ◽  
Thickness Effect ◽  
T Joints ◽  
Linear Elastic ◽  
Initiation And Propagation ◽  
Elastic Fracture ◽  
Fatigue Crack Development

The effect of section thickness on the fatigue life of welded plate-to-plate T-joints was studied experimentally and theoretically using various linear elastic fracture mechanics models. Fatigue crack depth and shape development were monitored using potential drop techniques, ink staining and beachmarking. These data are used to define initiation and propagation lives, and to show the importance of crack coalescence in the propagation phase. The effects of attachment plate thickness and weld geometry are also discussed.

Crack Initiation and Propagation as Part of Engineering Design

2012 ◽  
Author(s):  
Hans Minnebo ◽  
Marc Duflot ◽  
Eric Wyart
Keyword(s):  
Fatigue Crack ◽  
Fracture Mechanics ◽  
Crack Initiation ◽  
Crack Initiation And Propagation ◽  
Linear Elastic ◽  
Linear Fracture ◽  
Initiation And Propagation ◽  
Improve Analysis ◽  
Elastic Fracture ◽  
Analysis Design

This article deals with the interest of the analysis of cracks in order to improve analysis design. Mainly oriented around the linear elastic fracture mechanics and fatigue crack propagation, it will also address some issues in non-linear fracture mechanics and crack insertion.

Analysis of the Fatigue Crack Propagation Life-Span Based on Linear Elastic Fracture Mechanics

2012 ◽  
Vol 204-208 ◽  
pp. 3016-3021
Author(s):  
Zheng Wen Jiang ◽  
Shui Wan ◽  
Chen Cheng
Keyword(s):  
Fatigue Crack ◽  
Fracture Mechanics ◽  
Crack Propagation ◽  
Life Span ◽  
Fatigue Crack Propagation ◽  
Steel Specimen ◽  
Linear Elastic Fracture Mechanics ◽  
Linear Elastic ◽  
Elastic Fracture ◽  
Fatigue Crack Propagation Life

Abstract. The fatigue crack propagation life-span of the engineering structure is studied. Linear elastic fracture mechanics is applied to analyze the life-span of fatigue crack growth of specimen, which is under constant amplitude load. The software of Fatigue is used to calculate the life-span of a center crack plate steel specimen. The result show that the calculated values of the life-span are basically well with the experimental data.

Evaluation of Crack Growth in Oxygenated High Temperature Water Using Full Size Pipe Tests

1986 ◽  
Vol 108 (1) ◽  
pp. 50-56
Author(s):  
R. M. Horn
Keyword(s):  
High Temperature ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Crack Depth ◽  
Ultrasonic Inspection ◽  
Linear Elastic Fracture Mechanics ◽  
Growth Data ◽  
Full Size ◽  
Linear Elastic ◽  
Elastic Fracture

Full Size pipe tests have been conducted as part of EPRI research programs at the General Electric Company to verify IGSCC crack growth predictions made using a linear elastic fracture mechanics model. The tests on 10.16 cm (4″ pipes) were performed in oxygenated, high temperature, high purity water. The pipes were produced through standard manufacturing procedures which in turn led to characteristic field piping sensitization levels in the heat affected zones (HAZ) and characteristic through wall weld residual stresses. The tests were conducted at stresses equal to or below the yield strength under constant load with limited cycling. Ultrasonic inspection and metallography were used to characterize crack depth after several test phases and used to verify model predictions. Significant cracks were detected and radial and circumferential growth were documented. These test results support the predictions made using linear elastic fracture mechanics modeling, and are discussed in terms of crack growth data developed in CT specimens in the laboratory. The stress level and oxygen level are shown to influence the crack growth rates. Rates of circumferential crack growth are also evaluated. The paper discusses the results in the context of other stress corrosion evaluations as well.

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