Abrupt crack movement when a seam is cut

1977 ◽  
Vol 13 (4) ◽  
pp. 378-381
Author(s):  
A. M. Mikhailov
Keyword(s):  
Crack Movement

Influence of internal microstresses on rate of crack movement during cyclic deformation

1976 ◽  
Vol 8 (12) ◽  
pp. 1445-1447
Author(s):  
V. P. Valov ◽  
V. P. Vylezhnev ◽  
N. N. Lipchin ◽  
V. I. Sarrak
Keyword(s):  
Cyclic Deformation ◽  
Crack Movement ◽  
Internal Microstresses

scholarly journals Strain Concentration Ratio Analysis of Different Waterproofing Materials during Concrete Crack Movement

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4429
Author(s):  
Kyu-hwan Oh ◽  
Soo-yeon Kim
Keyword(s):  
Concentration Ratio ◽  
Evaluation Method ◽  
Strength Properties ◽  
Ratio Analysis ◽  
Strain Concentration ◽  
Testing Method ◽  
Concrete Crack ◽  
Crack Movement ◽  
Movement Simulation ◽  
Selection Of

When a crack occurs under an installed waterproofing material and moves due to environmental effects (freeze–thaw, settlement, vibration, dead load, etc.), waterproofing materials without adequate elongation or tensile strength properties may break and tear. To enable the selection of materials with proper response against the strain that occur during crack movement, this study proposes and demonstrates a new evaluation method for determining and comparing strain concentration of waterproofing materials under the effect of concrete crack movement. For the proposed testing method and demonstration, three common types of waterproofing material types were selected for testing, poly-urethane coating (PUC), self-adhesive asphalt sheet (SAS) and composite asphalt sheet (CAS). Respective materials are installed with strain gauges and applied onto a specimen with a separated joint that undergoes concrete crack movement simulation. Each specimen types are subject to repeated movement cycles, whereby strain occurring directly above the moving joint is measured and compared with the strain occurring at the localized sections (comparison ratio which is hereafter referred to as strain concentration ratio). Specimens are tested under four separate movement length conditions, 1.5 mm, 3.0 mm, 4.5 mm and 6.0 mm, and the results are compared accordingly. Experimental results show that materials with strain concentration ratio from highest to lowest are as follows: PUC, SAS and CAS.

Initial Crack Extension in Two Intermediate-Strength Aluminum Alloys

1976 ◽  
Vol 98 (2) ◽  
pp. 152-158 ◽  
Author(s):  
C. A. Griffis ◽  
G. R. Yoder
Keyword(s):  
Aluminum Alloys ◽  
Crack Extension ◽  
Initial Crack ◽  
Thickness Variation ◽  
Linear Elastic ◽  
Geometry Dependence ◽  
Crack Movement ◽  
Resistance Curves ◽  
Point Bend

Three-point bend tests were conducted to examine the geometry dependence of JIc in two intermediate-strength aluminum alloys, 2024-T351 and 7005-T6351. The amounts of crack growth at selected points on the load-versus-deflection curves were delineated using a heat tinting technique. Resistance curves of J-versus-crack extension were constructed to facilitate determination of JIc at incipient crack movement. The through-thickness variation in fracture toughness of a 7.6-cm-thick plate of 7005 aluminum was determined and correlated with fractographic and metallographic observations. The current JIc measurements from subsized specimens of 7005 aluminum are compared with previous KIc characterizations using linear-elastic, full-thickness specimens.

A Fracture Surface Rotation Mechanism for Fatigue Tested 2219-T87 Aluminum Sheet

1979 ◽  
Vol 101 (1) ◽  
pp. 80-85
Author(s):  
G. F. Pittinato
Keyword(s):  
Fracture Surface ◽  
Plastic Zone ◽  
Crack Tip ◽  
Aluminum Sheet ◽  
Surface Rotation ◽  
Fracture Transition ◽  
Slant Fracture ◽  
Crack Movement ◽  
Tension Loading ◽  
Active Slip

Fatigue crack propagation tests were conducted on 2219-T87 aluminum sheet to identify the factors that control the rate of fracture surface rotation. Center-cracked, axial loaded specimens were tested in air at room temperature using tension-tension loading. The log (da/dn) versus (ΔK) curve contained an inflection point that was associated with the flat to slant fracture transition. The size and shape of the plastic zone at the crack tip were determined as a function of the half-crack length by using optical interferometry. It was found that the rate of fracture surface rotation was controlled by the changing size of the crack tip plastic zone. It is proposed that fracture surface rotation in this material occurs by a process of crack movement within active slip zones. A discussion is given on the deformation mechanisms associated with fatigue fracture surface rotation.

Measuring Crack Movement in Reinforced Concrete Using Digital Image Correlation: Overview and Application to Shear Slip Measurements

2016 ◽  
Vol 104 (8) ◽  
pp. 1561-1574 ◽  
Author(s):  
Neil A. Hoult ◽  
Michael Dutton ◽  
Adam Hoag ◽  
W. Andy Take
Keyword(s):  
Reinforced Concrete ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Crack Movement ◽  
Shear Slip

Elastic-Plastic Fracture Toughness: A Comparison of J-Integral and Crack Opening Displacement Characterizations

1975 ◽  
Vol 97 (4) ◽  
pp. 278-283 ◽  
Author(s):  
C. A. Griffis
Keyword(s):  
Crack Opening Displacement ◽  
Integral Formula ◽  
Crack Opening ◽  
Fracture Initiation ◽  
Maximum Load ◽  
Minimum Size ◽  
J Integral ◽  
Opening Displacement ◽  
Geometry Dependence ◽  
Crack Movement

The geometry dependence of the J-integral and crack opening displacement at fracture initiation, Ji and (COD)i, is examined for HY-80 steel using precracked bend specimens having thicknesses ranging from 1.6 to 53mm. The amount of crack growth at selected points on the load-deflection diagram was delineated using an unload-heat tint procedure. Resistance curves of J and COD versus crack extension were constructed to determine critical values of these parameters at incipient crack movement. Results are interpreted in terms of previously proposed minimum size requirements for valid Ji measurement. The adequacy of the Rice-Srawley J-integral formula for the bend specimen and the utility of J and COD values at maximum load are also considered.

Statistical Time Series Analysis of Crack Movements at Bayon Main Tower, Cambodia

2010 ◽  
Vol 133-134 ◽  
pp. 397-402 ◽  
Author(s):  
Shunsuke Yamada ◽  
Masato Araya ◽  
Mitsuharu Fukuda ◽  
Yoshinori Iwasaki
Keyword(s):  
Time Series ◽  
Time Series Analysis ◽  
State Space ◽  
Weather Conditions ◽  
Space Representation ◽  
State Space Representation ◽  
The Past ◽  
Series Analysis ◽  
Crack Movement ◽  
Statistical Time

Based on the past monitoring data of crack movements and various weather conditions by JASA (Japanese Government Team of Safeguarding Angkor), we quantitatively examine about the effects of each weather conditions to each crack movements at Bayon main tower. Then, we applied the time series analysis using a state-space representation in the examination. In the model of the state-space representation, the factors of crack movement are assumed as temperature, wind velocity and rainfall. Those quantitative examinations of crack movements will be necessary for the planning of reinforcement and restoration at Bayon main tower.

Monitoring crack movement in polymer-based self-healing concrete through digital image correlation, acoustic emission analysis and SEM in-situ loading

2017 ◽  
Vol 115 ◽  
pp. 238-246 ◽  
Author(s):  
J. Feiteira ◽  
E. Tsangouri ◽  
E. Gruyaert ◽  
C. Lors ◽  
G. Louis ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Self Healing ◽  
Emission Analysis ◽  
Crack Movement ◽  
Acoustic Emission Analysis

Variation of crack propagation rate with resistance to crack movement

1976 ◽  
Vol 18 (8) ◽  
pp. 697-699
Author(s):  
M. V. Pirusskii ◽  
V. F. Bulanenko
Keyword(s):  
Crack Propagation ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Crack Movement

Crack movement in layered composites under electric field affect

2009 ◽  
Vol 51 (3) ◽  
pp. 189-194
Author(s):  
I.A. Miklashevich
Keyword(s):  
Electric Field ◽  
Layered Composites ◽  
Crack Movement
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