Processes at the tip of a statically loaded crack in AlZnMgCu 0.5

1972 ◽  
Vol 8 (4) ◽  
Author(s):  
Karl-Heinz Sehwalbe
Keyword(s):  
Loaded Crack

scholarly journals EXPERIMENTAL STUDIES OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH STEEL FIBER JACKET

2020 ◽  
pp. 34-45
Author(s):  
O. Radaikin ◽  
L. Sharafutdinov
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Breaking Load ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Steel Fiber Reinforced Concrete ◽  
Joint Work ◽  
Loaded Crack

The purpose of the study is to experimentally study the joint work of steel fiber reinforced concrete (SFB) reinforcement jacket and reinforced concrete beams at all stages of loading to further develop a methodology for calculating this method of reinforcing bending elements. The main results of the study consist in assessing the strength, stiffness, fracture toughness, as well as the nature of fracture with a picture of the development of cracks for the examined 4 samples (two with a jacket of reinforcement, two - control - without reinforcement). It has been established that the use of SFB jacket with a thickness of 45 mm and with a fiber content percentage of 2,5% (at a flow rate of 196 kg/m3) increases the breaking load by 20 %, stiffness from 3,4 to 11 times as it is loaded, crack resistance 2,4-2,8 times. The results are compared with computer modeling in ANSYS PC: the discrepancy in the load of crack formation, fracture and deflection values for full-scale samples and a computer model are within 6,3 %, which indicates the reliability of the numerical results and the possibility of using the proposed computer models in further studies on topic of the article.

Loaded crack surfaces in two and three dimensions with XFEM

2020 ◽  
Vol 78 ◽  
pp. 863-885 ◽  
Author(s):  
Markus Schätzer ◽  
Thomas-Peter Fries
Keyword(s):  
Three Dimensions ◽  
Loaded Crack

Electrochemical model of local corrosion at the tip of a loaded crack

1995 ◽  
Vol 30 (1) ◽  
pp. 19-24
Author(s):  
O. E. Andreikiv ◽  
N. I. Tym'yak
Keyword(s):  
Local Corrosion ◽  
Loaded Crack ◽  
Electrochemical Model

Finite Element Analysis of Secondary Cracks at a Crack Front under Pure Mode III Loading

2011 ◽  
Vol 488-489 ◽  
pp. 605-608 ◽  
Author(s):  
Matthias Ressel ◽  
Holger Theilig
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Crack Front ◽  
Mechanical Analysis ◽  
Pure Mode ◽  
Fracture Criteria ◽  
Mode Iii ◽  
Element Analysis ◽  
Secondary Cracks ◽  
Loaded Crack

Several hypotheses and concepts exist for the prediction of crack deflection angles from the analysis of the undisturbed stress distribution at the crack front. In this paper, a finite element analysis of small penny shaped secondary cracks with deflection angles ψ0 = π/4 at a pure mode III loaded crack front is presented. The results are compared with the solutions of the well-known 3D fracture criteria. The fracture mechanical analysis is performed by the highly effective MVCCI-method.

scholarly journals From force-responsive molecules to quantifying and mapping stresses in soft materials

2020 ◽  
Vol 6 (20) ◽  
pp. eaaz5093 ◽  
Author(s):  
Yinjun Chen ◽  
C. Joshua Yeh ◽  
Yuan Qi ◽  
Rong Long ◽  
Costantino Creton
Keyword(s):  
Direct Method ◽  
Soft Materials ◽  
Internal Force ◽  
Optical Observations ◽  
Innovative Tool ◽  
Loaded Crack ◽  
Cross Linker ◽  
Multiple Network ◽  
Spatially Varying ◽  
Random Nature

Directly quantifying a spatially varying stress in soft materials is currently a great challenge. We propose a method to do that by detecting a change in visible light absorption. We incorporate a spiropyran (SP) force–activated mechanophore cross-linker in multiple-network elastomers. The random nature of the network structure of the polymer causes a progressive activation of the SP force probe with load, detectable by the change in color of the material. We first calibrate precisely the chromatic change in uniaxial tension. We then demonstrate that the nominal stress around a loaded crack can be detected for each pixel and that the measured values match quantitatively finite element simulations. This direct method to quantify stresses in soft materials with an internal force probe is an innovative tool that holds great potential to compare quantitatively stresses in different materials with simple optical observations.

Mechanism of Stress Corrosion Cracking of Low Alloy Steel in Water

CORROSION ◽  
1981 ◽  
Vol 37 (6) ◽  
pp. 320-327 ◽  
Author(s):  
Wu-Yang Chu ◽  
Tian-Hua Liu ◽  
Chi-Mei Hsiao ◽  
Shi-Qun Li
Keyword(s):  
Plastic Deformation ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Cathodic Polarization ◽  
Optical Microscope ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Wide Range ◽  
Alloy Steels ◽  
Loaded Crack

Abstract For four low alloy steels with a wide range of tensile strengths, the dynamical processes of the nucleation and propagation of stress corrosion cracking (SCC) in water with various polarization conditions and in a inhibitor solution were traced with an optical microscope. The results show that if the tensile strength of the steel is higher than a critical value, which is different in the different polarization conditions, and KI>KISCC, the plastic zone in front of a loaded crack tip is enlarged with time, i.e., the delayed plastic deformation occurs in all the environments used. The nucleation and propagation of SCC will follow when this delayed plastic deformation develops to a critical condition. Neither anodic and cathodic polarization nor the inhibitor can change the feature of the delayed plasticity and the nucleation and propagation of SCC in water. In all the environments used, the KISCC is increased and da/dt is decreased with decreasing strength of the steel. Anodic polarization and the addition of the inhibitor make KISCC increase and da/dt decrease. But cathodic polarization is just opposite.

A Comparison of the Strains Due to Edge Cracks and Cuts of Finite Width With Applications to Residual Stress Measurement

1993 ◽  
Vol 115 (2) ◽  
pp. 220-226 ◽  
Author(s):  
W. Cheng ◽  
I. Finnie
Keyword(s):  
Stress Measurement ◽  
Arbitrary Distribution ◽  
Finite Width ◽  
Stress Distributions ◽  
Power Functions ◽  
Third Order ◽  
Near Surface ◽  
Surface Residual Stresses ◽  
Edge Cracks ◽  
Loaded Crack

The strains on the surface near a loaded crack or cut are compared for cuts of different width to depth ratios. General solutions are obtained for an arbitrary distribution of normal and shear tractions on the faces of the crack or cut. Numerical results are presented for normal stress distributions which vary with distance from the surface as power functions of zero to third order. The results are useful for measurement of near surface residual stresses and should also be of value for crack compliance measurements of stress intensity factors.

Sign in / Sign up

Export Citation Format

Share Document