Experimental investigation of the structural aspect of fracture initiation in specimens of hard alloys of WC-20% Co loaded in unixial compression

1977 ◽  
Vol 9 (7) ◽  
pp. 874-877
Author(s):  
G. G. Travushkin ◽  
K. S. Chernyavskii ◽  
V. A. Fal'kovskii ◽  
N. F. Koval'skaya
Keyword(s):  
Experimental Investigation ◽  
Fracture Initiation ◽  
Structural Aspect ◽  
Hard Alloys

Experimental investigation of cranial fracture initiation in blunt human head impacts

2019 ◽  
Vol 300 ◽  
pp. 51-62 ◽  
Author(s):  
Mariyam I. Isa ◽  
Todd W. Fenton ◽  
Alexis C. Goots ◽  
Elena O. Watson ◽  
Patrick E. Vaughan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Human Head ◽  
Fracture Initiation ◽  
Head Impacts

An Experimental Investigation of Filtercake Reinforced Wellbore Strengthening and Fracture Sealing

2019 ◽  
Author(s):  
Mingzheng Yang ◽  
Yuanhang Chen ◽  
Frederick B. Growcock ◽  
Feifei Zhang
Keyword(s):  
Experimental Investigation ◽  
Critical Role ◽  
Fracture Initiation ◽  
Fluid Loss ◽  
Lost Circulation ◽  
Fracture Sealing ◽  
Sealing Pressure ◽  
Wellbore Strengthening ◽  
Mud Loss ◽  
Lost Circulation Materials

Abstract Drilling-induced lost circulation should be managed before and during fracture initiation rather than after they propagate to form large fractures and losses become uncontrollable. Recent studies indicated the potentially critical role of filtercake in strengthening the wellbore through formation of a pressure-isolating barrier, as well as plugging microfractures during fracture initiation. In this study, an experimental investigation was conducted to understand the role played by filtercake in the presence of lost circulation materials (LCMs). A modified permeability plugging apparatus (PPA) with slotted discs was used to simulate whole mud loss through fractures of known width behind filtercake. Cumulative fluid loss upon achieving a complete seal and the maximum sealing pressure were measured to evaluate the combined effects of filtercake and LCMs in preventing and reducing fluid losses. The effects of some filtercake properties (along with LCM type, concentration and particle size distribution) on filtercake rupture and fracture sealing were investigated. The results indicate that filtercake can accelerate fracture sealing and reduce total mud loss. Efficiently depositing filtercake while drilling can reduce the concentration of LCM that is required to plug and isolate incipient fractures.

Experimental investigation of fracture initiation position and fluid viscosity effect in multi-layered coal strata

2019 ◽  
Vol 182 ◽  
pp. 106310 ◽  
Author(s):  
Liming Wan ◽  
Bing Hou ◽  
Han Meng ◽  
Zhi Chang ◽  
Yeerfulati Muhadasi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Fracture Initiation ◽  
Fluid Viscosity ◽  
Viscosity Effect

Three-Dimensional Effects Near a Crack Tip in a Ductile Three-Point Bend Specimen: Part II—An Experimental Investigation Using Interferometry and Caustics

1990 ◽  
Vol 57 (3) ◽  
pp. 618-626 ◽  
Author(s):  
Alan T. Zehnder ◽  
Ares J. Rosakis
Keyword(s):  
Experimental Investigation ◽  
Large Scale ◽  
Three Dimensional ◽  
Time History ◽  
Fracture Initiation ◽  
Optical Methods ◽  
J Integral ◽  
Bend Specimen ◽  
Dimensional Effects ◽  
Point Bend

An experimental investigation is undertaken to assess three-dimensional effects near a crack front in a ductile three-point bend specimen. The possibility of using the optical method of caustics for the measurement of the J-integral in the presence of large-scale yielding and three-dimensional fields is also investigated. Experiments using the optical methods of caustics by reflection and Twyman-Green interferometry are performed simultaneously on either side of the test specimen. The load and load-point displacement are also measured. The experimental results are compared with very good agreement to the results of a finite element simulation of the experiment. The caustics experiments are used to obtain a calibration relation between the value of the J-integral and the caustic diameter for load levels up to fracture initiation. It is proposed that such a calibration be used in dynamic fracture initiation experiments for the measurement of the time history of the dynamic J-integral.

scholarly journals Experimental Investigation on the Relationship between Brittle Fracture Initiation and Arrest Toughnesses of 9% Ni Steel

1983 ◽  
Vol 1983 (153) ◽  
pp. 306-315 ◽  
Author(s):  
Takeshi Kanazawa ◽  
Susumu Machida ◽  
Seinosuke Yano ◽  
Kiyoshi Tanaka ◽  
Shinichi Yamamoto ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Brittle Fracture ◽  
Fracture Initiation ◽  
The Relationship

scholarly journals Experimental Investigation of Dynamic Fracture Initiation in PMMA Submerged in Water

2016 ◽  
Vol 2 (3) ◽  
pp. 391-398 ◽  
Author(s):  
Orlando Delpino Gonzales ◽  
Kim Luong ◽  
Heidi Homma ◽  
Veronica Eliasson
Keyword(s):  
Experimental Investigation ◽  
Dynamic Fracture ◽  
Fracture Initiation

Experimental Investigation of Cutting Forces at Milling Titanium Alloys Comparing to Others Hard Alloys

2012 ◽  
Vol 245 ◽  
pp. 191-196
Author(s):  
Claudia Serboi ◽  
Stefan Velicu ◽  
Claudiu Bisu ◽  
Dorel Anania
Keyword(s):  
Experimental Investigation ◽  
Titanium Alloys ◽  
Cutting Forces ◽  
Polynomial Regression ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Hard Alloys ◽  
Experimental Procedure ◽  
Measurement Results ◽  
Regression Functions

This paper presents the experimental procedure of cutting forces measurement, results of the experimental research and their interpretation for the milling of titanium alloys comparing to other hard alloys. Furthermore, there are established the polynomial regression functions to determine the cutting forces depending on the cutting regime parameters: cutting speed, feed rate and depth of cut.

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