Modelling and experimental study of parallel cracks propagation in an orthotropic elastic material

The experimental results of forces and efforts derived from the opening of incisions in the orbital cavity in a pig’s head are presented in this article. The different areas of the incision openings are related to the needs at the incision procedure for a dacryocystorhinostomy. In terms of the experimental procedure, an origin and a plane are defined so as to allow the location of the opening of the incision. The incisions are retracted along an axis of said origin. This procedure has been based on the mathematical model developed for this work, which consists of a procedure for determining the behavior of an incision when a force is applied to retract the skin. The experimental data obtained, suggests the existence of an almost linear relationship between the increment of resistance in relation to the time obtained for each opening, the same of which is deemed to be consistent with the behavior of an elastic material.

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Cracks propagation and interaction in an orthotropic elastic material: Analytical and numerical methods

Computational Materials Science ◽

10.1016/j.commatsci.2009.06.006 ◽

2009 ◽

Vol 46 (3) ◽

pp. 687-693 ◽

Cited By ~ 42

Author(s):

T. Sadowski ◽

L. Marsavina ◽

N. Peride ◽

E.-M. Craciun

Keyword(s):

Numerical Methods ◽

Elastic Material ◽

Cracks Propagation

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Experimental study of dynamic fracture behavior of PMMA with overlapping offset-parallel cracks

Polymer Testing ◽

10.1016/s0142-9418(02)00173-3 ◽

2003 ◽

Vol 22 (6) ◽

pp. 663-670 ◽

Cited By ~ 41

Author(s):

X.F. Yao ◽

W. Xu ◽

M.Q. Xu ◽

K. Arakawa ◽

T. Mada ◽

...

Keyword(s):

Experimental Study ◽

Dynamic Fracture ◽

Fracture Behavior ◽

Parallel Cracks

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Numerical Simulation and Experiment of Interaction and Influence on Two Colinear and Offset Cracks by FRANC2D Software

ASME 2011 Pressure Vessels and Piping Conference: Volume 1 ◽

10.1115/pvp2011-57448 ◽

2011 ◽

Author(s):

Jianping Zhao ◽

Weiwei Wang

Keyword(s):

Stress Field ◽

Crack Length ◽

Inflection Point ◽

Experimental Tests ◽

Shielding Effect ◽

Lateral Separation ◽

Collinear Cracks ◽

Finite Element Software ◽

Parallel Cracks ◽

Cracks Propagation

By using the two-dimensional finite element software FRANC2D (Fracture Analysis Code 2D), the calculation of stress intensity factors at the crack tips has been implemented through simulating two collinear cracks and a pair of offset parallel cracks propagation. Interaction and influence between cracks of different geometry patterns with the cracks propagation were discussed. The influence of crack interaction on the direction of propagation was also represented. The results show that the interaction between cracks could produce either an enhancement or a shielding effect on the stress field depending on the geometry of cracks (including the positions of cracks, the lengths of cracks and so on). The stress field of two collinear cracks has always been enhanced and the maximum interaction would occur at the case where the two cracks have the same length. As for a pair of offset parallel cracks, the enhancement and the shielding effecting on the stress field form an inflection point at about the beginning of cracks overlap. The stress field has been affected by the ratio of lateral separation to crack length not the lateral separation 2h for a pair of offset parallel cracks. Once the two cracks overlap, the propagation directions of cracks would turn. The inflection point and turning would fade with the increase of the ratio of lateral separation to crack length. At the same time, some experimental tests were carried out to validate the analysis results.

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Experimental study on ultrasonic waves propagating along the surface and near surface of elastic material

NDT & E International ◽

10.1016/0963-8695(94)90102-3 ◽

1994 ◽

Vol 27 (1) ◽

pp. 55

Keyword(s):

Experimental Study ◽

Elastic Material ◽

Ultrasonic Waves ◽

Near Surface

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Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013955x ◽

1995 ◽

Vol 53 ◽

pp. 636-637

Author(s):

Norio Baba ◽

Norihiko Ichise ◽

Syunya Watanabe

Keyword(s):

Experimental Study ◽

Spherical Aberration ◽

Incident Beam ◽

Optical Parameters ◽

Beam Tilting ◽

Illumination Method ◽

Restoration Method ◽

Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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