Research on Crack Propagation Life for Ship Plates Based on Maximum Crack Opening Displacement

2015 ◽  
Vol 12 (16) ◽  
pp. 5873-5880
Author(s):  
Qin Dong
Keyword(s):  
Crack Propagation ◽  
Crack Opening Displacement ◽  
Crack Opening ◽  
Opening Displacement ◽  
Maximum Crack

scholarly journals Effect of Thickness on Fatigue Crack Propagation in Injection Molded Short Carbon Fiber Reinforced Plastics

2018 ◽  
Vol 165 ◽  
pp. 07002 ◽  
Author(s):  
Kenichi Shimizu ◽  
Yuya Hasegawa ◽  
Keisuke Tanaka
Keyword(s):  
Carbon Fiber ◽  
Crack Propagation ◽  
Crack Opening Displacement ◽  
Crack Opening ◽  
Plate Thickness ◽  
Fiber Reinforced ◽  
Opening Displacement ◽  
Short Carbon Fiber ◽  
Carbon Fiber Reinforced ◽  
Short Carbon

The influence of plate thickness on the fatigue crack propagation behavior was studied by using center-notched specimens which were cut from injection-molded plates of short carbon-fiber reinforced polyphenylene sulfide (PPS) at two fiber angles relative to the molding flow direction (MFD), i. e. θ=0 deg. (MD), 90 deg. (TD). The short carbon-fiber reinforced plastics (SCFRP) plates have three-layer structure where the fiber orientation is parallel to MFD in the shell layer and is nearly perpendicular in the core layer. The fraction of the core layer increases with increase in the plate thickness. In the relation between the crack propagation rate, da/dN, and stress intensity factor, ΔK, da/dN increases with increase in thickness for MD specimen. Conversely, da/dN decreases for TD specimen. The crack opening displacement along the crack was measured by using the digital image correlation (DIC) method. The measured crack opening displacement become larger with increase in the plate thickness for MD specimens. Contrary, measured values become smaller with increase in the plate thickness for TD specimen. The crack-tip-opening radius, Δρ, was estimated from the parabolic approximation of the crack opening displacement distribution near the crack tip. The relationships between da/dN and Δρ for all specimens tend to merge into a unique relationship.

Research on Calculation of DSIF Based on Maximum Crack Opening Displacement

2017 ◽  
Author(s):  
Jingjie Chen ◽  
Yi Huang ◽  
Yugang Li
Keyword(s):  
Crack Opening Displacement ◽  
Crack Opening ◽  
Infinite Plate ◽  
Opening Displacement ◽  
Dynamic Stress Intensity Factors ◽  
Simple Method ◽  
Arbitrary Loading ◽  
Maximum Crack ◽  
Loading Modes ◽  
The Relationship

A simple method is proposed to calculate the dynamic stress intensity factors (DSIFs) based on the maximum crack opening displacement (MCOD) away from crack tip under plane strain conditions. In this work, aimed at a central through cracked infinite plate under impact loads, the relationship between the DSIF and the corresponding MCOD is identified by theoretical analysis. The finite element method is employed to study the application of the relationship under different model geometries, material properties and loading modes. The investigation indicates that the presented method is applicable to the finite plate models of different materials under arbitrary loading modes.

Effects of Grain Size on Fatigue Crack Propagation in Copper Film

2010 ◽  
Vol 452-453 ◽  
pp. 289-292
Author(s):  
Kenichi Shimizu ◽  
Tashiyuki Torii
Keyword(s):  
Grain Size ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Crack Opening Displacement ◽  
Fatigue Crack Propagation ◽  
Fatigue Cracks ◽  
Crack Opening ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Opening Displacement

Using a fatigue testing method by which fatigue cracks can be initiated and propagated in a film adhered to cover a circular through-hole in a base plate subjected to cyclic loads, annealed copper films of 100m thickness with different crystal grain sizes were fatigued. The fatigue crack propagation in the film with large grains was often decelerated, so the crack propagation rate of the film with the large grain was lower than that of the film with the small grain. When the crack propagation was decelerated, the crack opening displacement obtained from the film with large grain size was smaller than that obtained from the film with small grain size. The relationship between the fatigue crack propagation rate and the stress intensity factor estimated from the crack opening displacement was identical for the cracks in the film with the large grain and the small grain.

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