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Through the employment of a corner crack specimen geometry containing a part through crack with a maximum length of 2.5 mm, the lamellar variant demonstrates microstructurally sensitive growth for cracks shorter than 1 mm.
An approximate analytic solution of elasto-plastic analysis for central crack specimen with finite width W in cellular/foam material is given based on generalized cohesive force model, and crack tip opening displacement is determined, which may be useful for plastic fracture experimental study and engineering applications of the advanced material.
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In pure mode I condition, the finite element analysis is carried out for three different specimens: centre crack, double edge crack and single edge crack specimens.
The MPZR criterion is applied to inclined surface crack specimens and through-crack specimens under mixed mode loading, and its performance is compared with those of the maximum tensile stress theory (MTS) and the minimum strain energy density theory (MSED).
Corner cracks were introduced into short crack specimens, similar to M T) – specimens, at one side of a hole (Ø = 4.8 mm) by cyclic compression (R = 20).
For validation, TMFCG experiments on corner-crack specimen were conducted.
The cracks growing in the same multi-crack specimen had close fatigue crack life both under constant amplitude loading and random load history.
Open image in new window Fig. 2 Shape of uniaxial restrained shrinkage cracking specimen.
A modified factor ξ was introduced to the Poiseuille law to verify the permeability of the cracked specimen.
Figure 2 shows the shape of the uniaxial restrained shrinkage cracking specimen of JIS A 1151 (2002) that was used to investigate shrinkage cracking characteristics.
Open image in new window Fig. 3 Central cracked specimen with finite strip of a finite width plate subjected to pair of normal forces.
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