scholarly journals Reconciling fracture toughness parameter contradictions in thin ductile metal sheets

2017 ◽  
Vol 40 (11) ◽  
pp. 1809-1824 ◽  
Author(s):  
W. R. Lanning ◽  
S. S. Javaid ◽  
C. L. Muhlstein
Keyword(s):  
Fracture Toughness ◽  
Ductile Metal ◽  
Metal Sheets ◽  
Toughness Parameter

Analysis of conical tool perforation of ductile metal sheets

2000 ◽  
Vol 42 (7) ◽  
pp. 1391-1403 ◽  
Author(s):  
Malik M Nazeer ◽  
M.Afzal Khan ◽  
Ather Naeem ◽  
Anwar-ul Haq
Keyword(s):  
Ductile Metal ◽  
Metal Sheets ◽  
Conical Tool

The Relationship Between Fracture Toughness and Stress Concentration Factors for Several High-Strength Aluminum Alloys

1964 ◽  
Vol 86 (4) ◽  
pp. 709-717 ◽  
Author(s):  
J. H. Mulherin ◽  
D. F. Armiento ◽  
H. Markus
Keyword(s):  
Fracture Toughness ◽  
Stress Concentration ◽  
Notch Root ◽  
High Strength ◽  
Root Radius ◽  
Concentration Factors ◽  
Toughness Parameter ◽  
Stress Concentration Factors ◽  
High Strength Aluminum Alloys ◽  
The Relationship

For the case of an elliptical notch in an infinite solid, a relationship between the stress concentration factor and the fracture toughness parameter was examined. Edge-notched specimens from three high-strength aluminum alloys were tensile loaded to failure. The resulting data were analyzed in the light of this relationship. It was indicated that a predicted proportionality between the fracture toughness parameter and the square root of the notch root radius exists. Further examination of the relationship based upon the proportionality showed that fracture occurs at a fixed state of strain within a plastic zone having a size proportional to the original root radius. However, a departure from the predicted behavior was evident with the introduction of plane strain components at the notch root. It was also demonstrated that the use of specimens with intermediate root radii for either the evaluation of a single material or as a basis of comparison between materials can lead to invalid conclusions. The reversion of fracture toughness data from blunt notch specimens to stress concentration factors is shown for one alloy. Due to a constancy in the ratio of the fracture parameter to the nominal stress, the resulting factor lacks sensitivity.

Processing and Mechanical Properties of SiC-Metal Interpenetrating Composites

1995 ◽  
Vol 410 ◽  
Author(s):  
Leszek Hozer ◽  
Yet-Ming Chiang ◽  
Svetlana Ivanova ◽  
Isa Bar-On
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Fracture Strength ◽  
Exchange Process ◽  
Secondary Phase ◽  
Single Edge ◽  
Ductile Metal ◽  
Silicon Carbides ◽  
Beam Technique

ABSTRACTIn this paper we demonstrate a liquid exchange process to introduce a ductile metal reinforcement phase in the amount of 10–30 vol. % into reaction-bonded silicon carbides (RBSCs). Immersion of RBSC in pure Al or Al-Si melts enables diffusional replacement of secondary phase silicon with metal. The Al and Al-Si exchanged composites show improvement in fracture toughness (single edge precracked beam technique) to 6–7 MPa·m1/2 as compared to 3–4 MPa·m1/2 in otherwise similar siliconized silicon carbide. Increased fracture strength (four point flexure) was also observed after the liquid exchange process.

scholarly journals Elastic Fracture Toughness for Ductile Metal Pipes with Circumferential Surface Cracks

2017 ◽  
Vol 730 ◽  
pp. 489-495 ◽  
Author(s):  
Chun Qing Li ◽  
Guo Yang Fu ◽  
Shang Tong Yang
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Linear Elastic Fracture Mechanics ◽  
Surface Cracks ◽  
Steel Pipes ◽  
Ductile Metal ◽  
Linear Elastic ◽  
Fracture Failure ◽  
Metal Pipes ◽  
Elastic Fracture

Surface cracks have long been recognized as a major cause for potential failures of metal pipes. In fracture analysis, the widely used method is based on linear elastic fracture mechanics. However, for ductile metal pipes, it has been known that the existence of plasticity results in easing of stress concentration at the crack front. This will ultimately increase the total fracture toughness. Therefore, when using linear elastic fracture mechanics to predict fracture failure of ductile metal pipes, the plastic portion of fracture toughness should be excluded. Otherwise, the value of fracture toughness will be overestimated, resulting in an under-estimated probability of failure. This paper intends to derive a model of elastic fracture toughness for steel pipes with a circumferential crack. The derived elastic fracture toughness is a function of crack geometry and material properties of the cracked pipe. The significance of the derived model is that the well-established linear elastic fracture mechanics can be used for ductile materials in predicting the fracture failure.

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