Determination of Fracture Energy and Process Zone Length by Using Variable-Notch One-Size Specimens

10.14359/421 ◽  
1999 ◽  
Vol 96 (1) ◽  
Keyword(s):  
Fracture Energy ◽  
Process Zone ◽  
Zone Length

Variable-notch one-size test method for fracture energy and process zone length

1996 ◽  
Vol 55 (3) ◽  
pp. 383-404 ◽  
Author(s):  
Tianxi Tang ◽  
Zdenek P. Bažant ◽  
Sungchul Yang ◽  
Dan Zollinger
Keyword(s):  
Fracture Energy ◽  
Process Zone ◽  
Test Method ◽  
Zone Length

Fiber Debonding Along a Crack Front in Paper

1998 ◽  
Vol 539 ◽  
Author(s):  
H. Kettunen ◽  
K. J. Niskanen
Keyword(s):  
Fracture Energy ◽  
Crack Front ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Bond Properties ◽  
Crack Line ◽  
Pull Out ◽  
Microscopic Damage ◽  
Debonding Process

AbstractWe follow the accumulation of microscopic damage ahead the crack tip in paper. The fiber debonding process varies even within each specimen because of large variation in fiber and bond properties. In general, stiff and weakly bonded fibers tend to debond as a rigid body while ductile or well bonded fibers pull out gradually in a process that propagates from the crack line to the fiber ends. Particularly in the latter case the network ruptures coherently rather than through debonding of single fibers. Experimental analysis and simulations show that fracture energy correlates closely with the size of the fracture process zone (FPZ) irrespective the nature of the debonding process. Only the cases of low bonding and stiff fibers seem to make an exception in that FPZ can grow in size without a corresponding increase in fracture energy.

Determination of the fracture energy in polymeric films byin situphotoelasticimetry on double edge notch specimen

2015 ◽  
Vol 133 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Florence Dubelley ◽  
Emilie Planes ◽  
Corine Bas ◽  
Bernard Yrieix ◽  
Lionel Flandin
Keyword(s):  
Fracture Energy ◽  
Polymeric Films ◽  
Double Edge ◽  
Edge Notch

Assessment of the fracture process zone in rocks using digital image correlation technique: The role of mode-mixity, size, geometry and material

2019 ◽  
Vol 29 (4) ◽  
pp. 646-666 ◽  
Author(s):  
M Moazzami ◽  
MR Ayatollahi ◽  
A Akhavan-Safar
Keyword(s):  
Digital Image Correlation ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Specimen Size ◽  
Image Correlation ◽  
Mode I ◽  
Mode Ii ◽  
Mode Mixity ◽  
Zone Length

This paper presents an experimental research on the length and shape of the fracture process zone of rocks under mode I, mixed mode (I + II) and mode II loading conditions for different geometries of cracked specimens made of two types of rocks, using the digital image correlation approach. Single edge notch bending (SENB) and semi-circular bend specimens are the two geometries considered. In order to investigate the effect of the specimen size on the fracture process zone length, rocks with three different sizes are produced and tested. To investigate the effect of the mode mixity on the fracture process zone length of marble and sandstone, the specimens are tested under different modes of loading. According to the experimental results, it is found that the fracture process zone length changes with mode ratio, specimen size, geometry and the material properties. The fracture process zone length increases when the mode of loading moves from mode I to mode II. Experimental results also show that fracture process zone becomes longer for specimens with larger sizes. The fracture process zone is also affected by the specimen geometry.

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