The load separation criterion and methodology in ductile fracture mechanics

1991 ◽  
Vol 47 (2) ◽  
pp. 81-104 ◽  
Author(s):  
M. H. Sharobeam ◽  
J. D. Landes
Keyword(s):  
Fracture Mechanics ◽  
Ductile Fracture ◽  
Separation Criterion ◽  
Load Separation

Application of Constraint-Sensitive Fracture Mechanics to the Assessment of Girth Weld Integrity

2004 ◽  
Author(s):  
Yong-Yi Wang ◽  
Ming Liu ◽  
David Horsley
Keyword(s):  
Fracture Mechanics ◽  
Ductile Fracture ◽  
Experimental Evidence ◽  
Practical Application ◽  
Constraint Effect ◽  
Potential Applications ◽  
Constraint Effects ◽  
Assessment Procedures ◽  
Cracked Specimens ◽  
Fracture Processes

It has been known since the 1960’s that the crack-tip fields of specimens containing sharp cracks depend on the mode of loading. Experimental evidence has shown that cracked specimens loaded in bending have lower toughness than the same material loaded in tension. This phenomenon has been attributed to the “constraint effect” on fracture. Modern constraint-sensitive fracture mechanics has brought about fundamental theoretical understandings on the constraint effects. The constraint-sensitive fracture mechanics has moved from academic circles to practical application, as evident by a number of recently published fitness-for-service (FFS) assessment procedures that incorporates the constraint effects. This paper reviews the developments in constraint-sensitive fracture mechanics with the focus on its potential applications to the assessment of pipeline girth weld integrity. The review covers (1) constraint theories and experimental evidences, (2) constraint models for brittle and ductile fracture, and (3) limitations of current constraint models. The paper closes with thoughts on the applications of the constraint models and theories to ductile fracture processes, which are the most relevant to modern linepipes and their welds.

Experimental Study on Mechanical Properties of Synthetic Macro-Fiber Reinforced Reactive Powder Concrete

2014 ◽  
Vol 496-500 ◽  
pp. 2402-2406
Author(s):  
Kui He ◽  
Hui Yang ◽  
Fang Fang Jia ◽  
Er Po Wang ◽  
Zhen Bao Lu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Compressive Strength ◽  
Fracture Mechanics ◽  
Flexural Strength ◽  
Fracture Energy ◽  
Ductile Fracture ◽  
Reactive Powder Concrete ◽  
Fiber Reinforced ◽  
Reactive Powder

Workability, strength and fracture mechanics of polypropylene macro-fiber reinforced Reactive powder concrete (RPC) were studied in this work. The results showed that the incorporation of macro-fiber could influence the workability of RPC, the slump of RPC decreased with the increasing of macro-fiber content; compressive strength decreased while splitting strength increased with the increasing of macro-fiber, meanwhile the flexural strength invariant. Macro-fiber could strongly enhance the flexural toughness of RPC and changed the failure mode from brittle to ductile; fracture energy tends to increase linearly with the increasing of macro-fiber.

scholarly journals Fracture and back stress along the Byrd Glacier flowband on the Ross Ice Shelf

2004 ◽  
Vol 16 (3) ◽  
pp. 345-354 ◽  
Author(s):  
JAMES P. KENNEALLY ◽  
TERENCE J. HUGHES
Keyword(s):  
Fracture Mechanics ◽  
Ductile Fracture ◽  
Back Stress ◽  
Ice Thickness ◽  
Subsequent Growth ◽  
Ice Shelf ◽  
Ross Ice Shelf ◽  
Transverse Tensile ◽  
Grounding Line ◽  
Shelf Flow

East Antarctic ice discharged by Byrd Glacier continues as a flowband to the calving front of the Ross Ice Shelf. Flow across the grounding line changes from compressive to extensive as it leaves the fjord through the Transantarctic Mountains occupied by Byrd Glacier. Magnitudes of the longitudinal compressive stress that suppress opening of transverse tensile cracks are calculated for the flowband. As compressive back stresses diminish, initial depths and subsequent growth of these cracks, and their spacing, are calculated using theories of elastic and ductile fracture mechanics. Cracks are initially about one millimeter wide, with approximately 30 m depths and 20 m spacings for a back stress of 83 kPa at a distance of 50 km beyond the fjord, where floating ice is 600 m thick. When these crevasses penetrate the whole ice thickness, they release tabular icebergs 20 km to 100 km wide, spaced parallel to the calving front of the Ross Ice Shelf.

scholarly journals Application of the load separation criterion in J-testing of ductile polymers: A round-robin testing exercise

2015 ◽  
Vol 44 ◽  
pp. 72-81 ◽  
Author(s):  
S. Agnelli ◽  
F. Baldi ◽  
B.R.K. Blackman ◽  
L. Castellani ◽  
P.M. Frontini ◽  
...  
Keyword(s):  
Round Robin ◽  
Separation Criterion ◽  
Load Separation
Sign in / Sign up

Export Citation Format

Share Document